@tanstack/pacer - npm Package Compare versions

Comparing version 0.9.1 to 0.10.0

dist/cjs/async-batcher.cjs

@@ -12,3 +12,2 @@ "use strict";
     isPending: false,
-    isRunning: true,
     items: [],
@@ -70,3 +69,3 @@ lastResult: void 0,
         this.#execute();
-      } else if (this.store.state.isRunning && this.options.wait !== Infinity) {
+      } else if (this.options.wait !== Infinity) {
         this.#clearTimeout();
@@ -117,12 +116,2 @@ this.#timeoutId = setTimeout(() => this.#execute(), this.#getWait());
     };
-    this.stop = () => {
-      this.#setState({ isRunning: false });
-      this.#clearTimeout();
-    };
-    this.start = () => {
-      this.#setState({ isRunning: true });
-      if (this.store.state.items.length > 0 && !this.#timeoutId) {
-        this.#timeoutId = setTimeout(() => this.#execute(), this.#getWait());
-      }
-    };
     this.peekAllItems = () => {
@@ -129,0 +118,0 @@ return [...this.store.state.items];

dist/cjs/async-batcher.cjs.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"async-batcher.cjs","sources":["../../src/async-batcher.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { OptionalKeys } from './types'\n\nexport interface AsyncBatcherState<TValue> {\n  /**\n   * Number of batch executions that have resulted in errors\n   */\n  errorCount: number\n  /**\n   * Array of items that failed during batch processing\n   */\n  failedItems: Array<TValue>\n  /**\n   * Whether the batcher has no items to process (items array is empty)\n   */\n  isEmpty: boolean\n  /**\n   * Whether a batch is currently being processed asynchronously\n   */\n  isExecuting: boolean\n  /**\n   * Whether the batcher is waiting for the timeout to trigger batch processing\n   */\n  isPending: boolean\n  /**\n   * Whether the batcher is active and will process items automatically\n   */\n  isRunning: boolean\n  /**\n   * Array of items currently queued for batch processing\n   */\n  items: Array<TValue>\n  /**\n   * The result from the most recent batch execution\n   */\n  lastResult: any\n  /**\n   * Number of batch executions that have completed (either successfully or with errors)\n   */\n  settleCount: number\n  /**\n   * Number of items currently in the batch queue\n   */\n  size: number\n  /**\n   * Current processing status - 'idle' when not processing, 'pending' when waiting for timeout, 'executing' when processing, 'populated' when items are present, but no wait is configured\n   */\n  status: 'idle' | 'pending' | 'executing' | 'populated'\n  /**\n   * Number of batch executions that have completed successfully\n   */\n  successCount: number\n  /**\n   * Total number of items that have been processed across all batches\n   */\n  totalItemsProcessed: number\n  /**\n   * Total number of items that have failed processing across all batches\n   */\n  totalItemsFailed: number\n}\n\nfunction getDefaultAsyncBatcherState<TValue>(): AsyncBatcherState<TValue> {\n  return {\n    errorCount: 0,\n    failedItems: [],\n    isEmpty: true,\n    isExecuting: false,\n    isPending: false,\n    isRunning: true,\n    items: [],\n    lastResult: undefined,\n    settleCount: 0,\n    size: 0,\n    status: 'idle',\n    successCount: 0,\n    totalItemsProcessed: 0,\n    totalItemsFailed: 0,\n  }\n}\n\n/**\n * Options for configuring an AsyncBatcher instance\n */\nexport interface AsyncBatcherOptions<TValue> {\n  /**\n   * Custom function to determine if a batch should be processed\n   * Return true to process the batch immediately\n   */\n  getShouldExecute?: (\n    items: Array<TValue>,\n    batcher: AsyncBatcher<TValue>,\n  ) => boolean\n  /**\n   * Initial state for the async batcher\n   */\n  initialState?: Partial<AsyncBatcherState<TValue>>\n  /**\n   * Maximum number of items in a batch\n   * @default Infinity\n   */\n  maxSize?: number\n  /**\n   * Optional error handler for when the batch function throws.\n   * If provided, the handler will be called with the error and batcher instance.\n   * This can be used alongside throwOnError - the handler will be called before any error is thrown.\n   */\n  onError?: (\n    error: unknown,\n    failedItems: Array<TValue>,\n    batcher: AsyncBatcher<TValue>,\n  ) => void\n  /**\n   * Callback fired after a batch is processed\n   */\n  onExecute?: (batcher: AsyncBatcher<TValue>) => void\n  /**\n   * Callback fired after items are added to the batcher\n   */\n  onItemsChange?: (batcher: AsyncBatcher<TValue>) => void\n  /**\n   * Optional callback to call when a batch is settled (completed or failed)\n   */\n  onSettled?: (batcher: AsyncBatcher<TValue>) => void\n  /**\n   * Optional callback to call when a batch succeeds\n   */\n  onSuccess?: (result: any, batcher: AsyncBatcher<TValue>) => void\n  /**\n   * Whether the batcher should start processing immediately\n   * @default true\n   */\n  started?: boolean\n  /**\n   * Whether to throw errors when they occur.\n   * Defaults to true if no onError handler is provided, false if an onError handler is provided.\n   * Can be explicitly set to override these defaults.\n   */\n  throwOnError?: boolean\n  /**\n   * Maximum time in milliseconds to wait before processing a batch.\n   * If the wait duration has elapsed, the batch will be processed.\n   * If not provided, the batch will not be triggered by a timeout.\n   * @default Infinity\n   */\n  wait?: number | ((asyncBatcher: AsyncBatcher<TValue>) => number)\n}\n\ntype AsyncBatcherOptionsWithOptionalCallbacks<TValue> = OptionalKeys<\n  Required<AsyncBatcherOptions<TValue>>,\n  | 'initialState'\n  | 'onError'\n  | 'onExecute'\n  | 'onItemsChange'\n  | 'onSettled'\n  | 'onSuccess'\n>\n\nconst defaultOptions: AsyncBatcherOptionsWithOptionalCallbacks<any> = {\n  getShouldExecute: () => false,\n  maxSize: Infinity,\n  started: true,\n  throwOnError: true,\n  wait: Infinity,\n}\n\n/**\n * A class that collects items and processes them in batches asynchronously.\n *\n * This is the async version of the Batcher class. Unlike the sync version, this async batcher:\n * - Handles promises and returns results from batch executions\n * - Provides error handling with configurable error behavior\n * - Tracks success, error, and settle counts separately\n * - Has state tracking for when batches are executing\n * - Returns the result of the batch function execution\n *\n * Batching is a technique for grouping multiple operations together to be processed as a single unit.\n *\n * The AsyncBatcher provides a flexible way to implement async batching with configurable:\n * - Maximum batch size (number of items per batch)\n * - Time-based batching (process after X milliseconds)\n * - Custom batch processing logic via getShouldExecute\n * - Event callbacks for monitoring batch operations\n * - Error handling for failed batch operations\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and batcher instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the AsyncBatcher instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async batcher\n * - Use `onSuccess` callback to react to successful batch execution and implement custom logic\n * - Use `onError` callback to react to batch execution errors and implement custom error handling\n * - Use `onSettled` callback to react to batch execution completion (success or error) and implement custom logic\n * - Use `onExecute` callback to react to batch execution and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the batcher\n * - The state includes total items processed, success/error counts, and execution status\n * - State can be accessed via `asyncBatcher.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `asyncBatcher.state`\n *\n * @example\n * ```ts\n * const batcher = new AsyncBatcher<number>(\n *   async (items) => {\n *     const result = await processItems(items);\n *     console.log('Processing batch:', items);\n *     return result;\n *   },\n *   {\n *     maxSize: 5,\n *     wait: 2000,\n *     onSuccess: (result) => console.log('Batch succeeded:', result),\n *     onError: (error) => console.error('Batch failed:', error)\n *   }\n * );\n *\n * batcher.addItem(1);\n * batcher.addItem(2);\n * // After 2 seconds or when 5 items are added, whichever comes first,\n * // the batch will be processed and the result will be available\n * // batcher.execute() // manually trigger a batch\n * ```\n */\nexport class AsyncBatcher<TValue> {\n  readonly store: Store<Readonly<AsyncBatcherState<TValue>>> = new Store(\n    getDefaultAsyncBatcherState<TValue>(),\n  )\n  options: AsyncBatcherOptionsWithOptionalCallbacks<TValue>\n  #timeoutId: NodeJS.Timeout | null = null\n\n  constructor(\n    private fn: (items: Array<TValue>) => Promise<any>,\n    initialOptions: AsyncBatcherOptions<TValue>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n      throwOnError: initialOptions.throwOnError ?? !initialOptions.onError,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the async batcher options\n   */\n  setOptions = (newOptions: Partial<AsyncBatcherOptions<TValue>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<AsyncBatcherState<TValue>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const { isExecuting, isPending, items } = combinedState\n      const size = items.length\n      const isEmpty = size === 0\n      return {\n        ...combinedState,\n        isEmpty,\n        size,\n        status: isExecuting\n          ? 'executing'\n          : isPending\n            ? 'pending'\n            : isEmpty\n              ? 'idle'\n              : 'populated',\n      }\n    })\n  }\n\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait, this)\n  }\n\n  /**\n   * Adds an item to the async batcher\n   * If the batch size is reached, timeout occurs, or shouldProcess returns true, the batch will be processed\n   */\n  addItem = (item: TValue): void => {\n    this.#setState({\n      items: [...this.store.state.items, item],\n      isPending: this.options.wait !== Infinity,\n    })\n    this.options.onItemsChange?.(this)\n\n    const shouldProcess =\n      this.store.state.items.length >= this.options.maxSize ||\n      this.options.getShouldExecute(this.store.state.items, this)\n\n    if (shouldProcess) {\n      this.#execute()\n    } else if (this.store.state.isRunning && this.options.wait !== Infinity) {\n      this.#clearTimeout() // clear any pending timeout to replace it with a new one\n      this.#timeoutId = setTimeout(() => this.#execute(), this.#getWait())\n    }\n  }\n\n  /**\n   * Processes the current batch of items asynchronously.\n   * This method will automatically be triggered if the batcher is running and any of these conditions are met:\n   * - The number of items reaches maxSize\n   * - The wait duration has elapsed\n   * - The getShouldExecute function returns true upon adding an item\n   *\n   * You can also call this method manually to process the current batch at any time.\n   *\n   * @returns A promise that resolves with the result of the batch function, or undefined if an error occurred and was handled by onError\n   * @throws The error from the batch function if no onError handler is configured\n   */\n  #execute = async (): Promise<any> => {\n    if (this.store.state.items.length === 0) {\n      return undefined\n    }\n\n    const batch = this.peekAllItems() // copy of the items to be processed (to prevent race conditions)\n    this.clear() // Clear items before processing to prevent race conditions\n    this.options.onItemsChange?.(this) // Call onItemsChange to notify listeners that the items have changed\n\n    this.#setState({ isExecuting: true })\n\n    try {\n      const result = await this.fn(batch) // EXECUTE\n      this.#setState({\n        totalItemsProcessed:\n          this.store.state.totalItemsProcessed + batch.length,\n        lastResult: result,\n        successCount: this.store.state.successCount + 1,\n      })\n      this.options.onSuccess?.(result, this)\n      return result\n    } catch (error) {\n      this.#setState({\n        errorCount: this.store.state.errorCount + 1,\n        failedItems: [...this.store.state.failedItems, ...batch],\n        totalItemsFailed: this.store.state.totalItemsFailed + batch.length,\n      })\n      this.options.onError?.(error, batch, this)\n      if (this.options.throwOnError) {\n        throw error\n      }\n      return undefined\n    } finally {\n      this.#setState({\n        isExecuting: false,\n        settleCount: this.store.state.settleCount + 1,\n      })\n      this.options.onSettled?.(this)\n      this.options.onExecute?.(this)\n    }\n  }\n\n  /**\n   * Processes the current batch of items immediately\n   */\n  flush = async (): Promise<any> => {\n    this.#clearTimeout() // clear any pending timeout\n    return await this.#execute()\n  }\n\n  /**\n   * Stops the async batcher from processing batches\n   */\n  stop = (): void => {\n    this.#setState({ isRunning: false })\n    this.#clearTimeout()\n  }\n\n  /**\n   * Starts the async batcher and processes any pending items\n   */\n  start = (): void => {\n    this.#setState({ isRunning: true })\n    if (this.store.state.items.length > 0 && !this.#timeoutId) {\n      this.#timeoutId = setTimeout(() => this.#execute(), this.#getWait())\n    }\n  }\n\n  /**\n   * Returns a copy of all items in the async batcher\n   */\n  peekAllItems = (): Array<TValue> => {\n    return [...this.store.state.items]\n  }\n\n  peekFailedItems = (): Array<TValue> => {\n    return [...this.store.state.failedItems]\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = null\n    }\n  }\n\n  /**\n   * Removes all items from the async batcher\n   */\n  clear = (): void => {\n    this.#setState({ items: [], failedItems: [], isPending: false })\n  }\n\n  /**\n   * Resets the async batcher state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultAsyncBatcherState<TValue>())\n    this.options.onItemsChange?.(this)\n  }\n}\n\n/**\n * Creates an async batcher that processes items in batches\n *\n * Unlike the sync batcher, this async version:\n * - Handles promises and returns results from batch executions\n * - Provides error handling with configurable error behavior\n * - Tracks success, error, and settle counts separately\n * - Has state tracking for when batches are executing\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and batcher instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncBatcher instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async batcher\n * - Use `onSuccess` callback to react to successful batch execution and implement custom logic\n * - Use `onError` callback to react to batch execution errors and implement custom error handling\n * - Use `onSettled` callback to react to batch execution completion (success or error) and implement custom logic\n * - Use `onExecute` callback to react to batch execution and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the batcher\n * - The state includes total items processed, success/error counts, and execution status\n * - State can be accessed via the underlying AsyncBatcher instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * @example\n * ```ts\n * const batchItems = asyncBatch<number>(\n *   async (items) => {\n *     const result = await processApiCall(items);\n *     console.log('Processing:', items);\n *     return result;\n *   },\n *   {\n *     maxSize: 3,\n *     wait: 1000,\n *     onSuccess: (result) => console.log('Batch succeeded:', result),\n *     onError: (error) => console.error('Batch failed:', error)\n *   }\n * );\n *\n * batchItems(1);\n * batchItems(2);\n * batchItems(3); // Triggers batch processing\n * ```\n */\nexport function asyncBatch<TValue>(\n  fn: (items: Array<TValue>) => Promise<any>,\n  options: AsyncBatcherOptions<TValue>,\n) {\n  const batcher = new AsyncBatcher<TValue>(fn, options)\n  return batcher.addItem\n}\n"],"names":["Store","parseFunctionOrValue"],"mappings":";;;;AA+DA,SAAS,8BAAiE;AACxE,SAAO;AAAA,IACL,YAAY;AAAA,IACZ,aAAa,CAAA;AAAA,IACb,SAAS;AAAA,IACT,aAAa;AAAA,IACb,WAAW;AAAA,IACX,WAAW;AAAA,IACX,OAAO,CAAA;AAAA,IACP,YAAY;AAAA,IACZ,aAAa;AAAA,IACb,MAAM;AAAA,IACN,QAAQ;AAAA,IACR,cAAc;AAAA,IACd,qBAAqB;AAAA,IACrB,kBAAkB;AAAA,EAAA;AAEtB;AA+EA,MAAM,iBAAgE;AAAA,EACpE,kBAAkB,MAAM;AAAA,EACxB,SAAS;AAAA,EACT,SAAS;AAAA,EACT,cAAc;AAAA,EACd,MAAM;AACR;AA+DO,MAAM,aAAqB;AAAA,EAOhC,YACU,IACR,gBACA;AAFQ,SAAA,KAAA;AAPV,SAAS,QAAoD,IAAIA,MAAAA;AAAAA,MAC/D,4BAAA;AAAA,IAAoC;AAGtC,SAAA,aAAoC;AAiBpC,SAAA,aAAa,CAAC,eAA2D;AACvE,WAAK,UAAU,EAAE,GAAG,KAAK,SAAS,GAAG,WAAA;AAAA,IAAW;AAGlD,SAAA,YAAY,CAAC,aAAuD;AAClE,WAAK,MAAM,SAAS,CAAC,UAAU;AAC7B,cAAM,gBAAgB;AAAA,UACpB,GAAG;AAAA,UACH,GAAG;AAAA,QAAA;AAEL,cAAM,EAAE,aAAa,WAAW,MAAA,IAAU;AAC1C,cAAM,OAAO,MAAM;AACnB,cAAM,UAAU,SAAS;AACzB,eAAO;AAAA,UACL,GAAG;AAAA,UACH;AAAA,UACA;AAAA,UACA,QAAQ,cACJ,cACA,YACE,YACA,UACE,SACA;AAAA,QAAA;AAAA,MACV,CACD;AAAA,IAAA;AAGH,SAAA,WAAW,MAAc;AACvB,aAAOC,MAAAA,qBAAqB,KAAK,QAAQ,MAAM,IAAI;AAAA,IAAA;AAOrD,SAAA,UAAU,CAAC,SAAuB;AAChC,WAAK,UAAU;AAAA,QACb,OAAO,CAAC,GAAG,KAAK,MAAM,MAAM,OAAO,IAAI;AAAA,QACvC,WAAW,KAAK,QAAQ,SAAS;AAAA,MAAA,CAClC;AACD,WAAK,QAAQ,gBAAgB,IAAI;AAEjC,YAAM,gBACJ,KAAK,MAAM,MAAM,MAAM,UAAU,KAAK,QAAQ,WAC9C,KAAK,QAAQ,iBAAiB,KAAK,MAAM,MAAM,OAAO,IAAI;AAE5D,UAAI,eAAe;AACjB,aAAK,SAAA;AAAA,MAAS,WACL,KAAK,MAAM,MAAM,aAAa,KAAK,QAAQ,SAAS,UAAU;AACvE,aAAK,cAAA;AACL,aAAK,aAAa,WAAW,MAAM,KAAK,YAAY,KAAK,UAAU;AAAA,MAAA;AAAA,IACrE;AAeF,SAAA,WAAW,YAA0B;AACnC,UAAI,KAAK,MAAM,MAAM,MAAM,WAAW,GAAG;AACvC,eAAO;AAAA,MAAA;AAGT,YAAM,QAAQ,KAAK,aAAA;AACnB,WAAK,MAAA;AACL,WAAK,QAAQ,gBAAgB,IAAI;AAEjC,WAAK,UAAU,EAAE,aAAa,KAAA,CAAM;AAEpC,UAAI;AACF,cAAM,SAAS,MAAM,KAAK,GAAG,KAAK;AAClC,aAAK,UAAU;AAAA,UACb,qBACE,KAAK,MAAM,MAAM,sBAAsB,MAAM;AAAA,UAC/C,YAAY;AAAA,UACZ,cAAc,KAAK,MAAM,MAAM,eAAe;AAAA,QAAA,CAC/C;AACD,aAAK,QAAQ,YAAY,QAAQ,IAAI;AACrC,eAAO;AAAA,MAAA,SACA,OAAO;AACd,aAAK,UAAU;AAAA,UACb,YAAY,KAAK,MAAM,MAAM,aAAa;AAAA,UAC1C,aAAa,CAAC,GAAG,KAAK,MAAM,MAAM,aAAa,GAAG,KAAK;AAAA,UACvD,kBAAkB,KAAK,MAAM,MAAM,mBAAmB,MAAM;AAAA,QAAA,CAC7D;AACD,aAAK,QAAQ,UAAU,OAAO,OAAO,IAAI;AACzC,YAAI,KAAK,QAAQ,cAAc;AAC7B,gBAAM;AAAA,QAAA;AAER,eAAO;AAAA,MAAA,UACT;AACE,aAAK,UAAU;AAAA,UACb,aAAa;AAAA,UACb,aAAa,KAAK,MAAM,MAAM,cAAc;AAAA,QAAA,CAC7C;AACD,aAAK,QAAQ,YAAY,IAAI;AAC7B,aAAK,QAAQ,YAAY,IAAI;AAAA,MAAA;AAAA,IAC/B;AAMF,SAAA,QAAQ,YAA0B;AAChC,WAAK,cAAA;AACL,aAAO,MAAM,KAAK,SAAA;AAAA,IAAS;AAM7B,SAAA,OAAO,MAAY;AACjB,WAAK,UAAU,EAAE,WAAW,MAAA,CAAO;AACnC,WAAK,cAAA;AAAA,IAAc;AAMrB,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,EAAE,WAAW,KAAA,CAAM;AAClC,UAAI,KAAK,MAAM,MAAM,MAAM,SAAS,KAAK,CAAC,KAAK,YAAY;AACzD,aAAK,aAAa,WAAW,MAAM,KAAK,YAAY,KAAK,UAAU;AAAA,MAAA;AAAA,IACrE;AAMF,SAAA,eAAe,MAAqB;AAClC,aAAO,CAAC,GAAG,KAAK,MAAM,MAAM,KAAK;AAAA,IAAA;AAGnC,SAAA,kBAAkB,MAAqB;AACrC,aAAO,CAAC,GAAG,KAAK,MAAM,MAAM,WAAW;AAAA,IAAA;AAGzC,SAAA,gBAAgB,MAAY;AAC1B,UAAI,KAAK,YAAY;AACnB,qBAAa,KAAK,UAAU;AAC5B,aAAK,aAAa;AAAA,MAAA;AAAA,IACpB;AAMF,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,EAAE,OAAO,CAAA,GAAI,aAAa,CAAA,GAAI,WAAW,OAAO;AAAA,IAAA;AAMjE,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,6BAAqC;AACpD,WAAK,QAAQ,gBAAgB,IAAI;AAAA,IAAA;AAhLjC,SAAK,UAAU;AAAA,MACb,GAAG;AAAA,MACH,GAAG;AAAA,MACH,cAAc,eAAe,gBAAgB,CAAC,eAAe;AAAA,IAAA;AAE/D,SAAK,UAAU,KAAK,QAAQ,gBAAgB,CAAA,CAAE;AAAA,EAAA;AAAA,EAXhD;AAAA,EAqBA;AAAA,EAwBA;AAAA,EAuCA;AAAA,EA+EA;AAqBF;AAmDO,SAAS,WACd,IACA,SACA;AACA,QAAM,UAAU,IAAI,aAAqB,IAAI,OAAO;AACpD,SAAO,QAAQ;AACjB;;;"}
+{"version":3,"file":"async-batcher.cjs","sources":["../../src/async-batcher.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { OptionalKeys } from './types'\n\nexport interface AsyncBatcherState<TValue> {\n  /**\n   * Number of batch executions that have resulted in errors\n   */\n  errorCount: number\n  /**\n   * Array of items that failed during batch processing\n   */\n  failedItems: Array<TValue>\n  /**\n   * Whether the batcher has no items to process (items array is empty)\n   */\n  isEmpty: boolean\n  /**\n   * Whether a batch is currently being processed asynchronously\n   */\n  isExecuting: boolean\n  /**\n   * Whether the batcher is waiting for the timeout to trigger batch processing\n   */\n  isPending: boolean\n  /**\n   * Array of items currently queued for batch processing\n   */\n  items: Array<TValue>\n  /**\n   * The result from the most recent batch execution\n   */\n  lastResult: any\n  /**\n   * Number of batch executions that have completed (either successfully or with errors)\n   */\n  settleCount: number\n  /**\n   * Number of items currently in the batch queue\n   */\n  size: number\n  /**\n   * Current processing status - 'idle' when not processing, 'pending' when waiting for timeout, 'executing' when processing, 'populated' when items are present, but no wait is configured\n   */\n  status: 'idle' | 'pending' | 'executing' | 'populated'\n  /**\n   * Number of batch executions that have completed successfully\n   */\n  successCount: number\n  /**\n   * Total number of items that have failed processing across all batches\n   */\n  totalItemsFailed: number\n  /**\n   * Total number of items that have been processed across all batches\n   */\n  totalItemsProcessed: number\n}\n\nfunction getDefaultAsyncBatcherState<TValue>(): AsyncBatcherState<TValue> {\n  return {\n    errorCount: 0,\n    failedItems: [],\n    isEmpty: true,\n    isExecuting: false,\n    isPending: false,\n    items: [],\n    lastResult: undefined,\n    settleCount: 0,\n    size: 0,\n    status: 'idle',\n    successCount: 0,\n    totalItemsProcessed: 0,\n    totalItemsFailed: 0,\n  }\n}\n\n/**\n * Options for configuring an AsyncBatcher instance\n */\nexport interface AsyncBatcherOptions<TValue> {\n  /**\n   * Custom function to determine if a batch should be processed\n   * Return true to process the batch immediately\n   */\n  getShouldExecute?: (\n    items: Array<TValue>,\n    batcher: AsyncBatcher<TValue>,\n  ) => boolean\n  /**\n   * Initial state for the async batcher\n   */\n  initialState?: Partial<AsyncBatcherState<TValue>>\n  /**\n   * Maximum number of items in a batch\n   * @default Infinity\n   */\n  maxSize?: number\n  /**\n   * Optional error handler for when the batch function throws.\n   * If provided, the handler will be called with the error and batcher instance.\n   * This can be used alongside throwOnError - the handler will be called before any error is thrown.\n   */\n  onError?: (\n    error: unknown,\n    failedItems: Array<TValue>,\n    batcher: AsyncBatcher<TValue>,\n  ) => void\n  /**\n   * Callback fired after a batch is processed\n   */\n  onExecute?: (batcher: AsyncBatcher<TValue>) => void\n  /**\n   * Callback fired after items are added to the batcher\n   */\n  onItemsChange?: (batcher: AsyncBatcher<TValue>) => void\n  /**\n   * Optional callback to call when a batch is settled (completed or failed)\n   */\n  onSettled?: (batcher: AsyncBatcher<TValue>) => void\n  /**\n   * Optional callback to call when a batch succeeds\n   */\n  onSuccess?: (result: any, batcher: AsyncBatcher<TValue>) => void\n  /**\n   * Whether the batcher should start processing immediately\n   * @default true\n   */\n  started?: boolean\n  /**\n   * Whether to throw errors when they occur.\n   * Defaults to true if no onError handler is provided, false if an onError handler is provided.\n   * Can be explicitly set to override these defaults.\n   */\n  throwOnError?: boolean\n  /**\n   * Maximum time in milliseconds to wait before processing a batch.\n   * If the wait duration has elapsed, the batch will be processed.\n   * If not provided, the batch will not be triggered by a timeout.\n   * @default Infinity\n   */\n  wait?: number | ((asyncBatcher: AsyncBatcher<TValue>) => number)\n}\n\ntype AsyncBatcherOptionsWithOptionalCallbacks<TValue> = OptionalKeys<\n  Required<AsyncBatcherOptions<TValue>>,\n  | 'initialState'\n  | 'onError'\n  | 'onExecute'\n  | 'onItemsChange'\n  | 'onSettled'\n  | 'onSuccess'\n>\n\nconst defaultOptions: AsyncBatcherOptionsWithOptionalCallbacks<any> = {\n  getShouldExecute: () => false,\n  maxSize: Infinity,\n  started: true,\n  throwOnError: true,\n  wait: Infinity,\n}\n\n/**\n * A class that collects items and processes them in batches asynchronously.\n *\n * This is the async version of the Batcher class. Unlike the sync version, this async batcher:\n * - Handles promises and returns results from batch executions\n * - Provides error handling with configurable error behavior\n * - Tracks success, error, and settle counts separately\n * - Has state tracking for when batches are executing\n * - Returns the result of the batch function execution\n *\n * Batching is a technique for grouping multiple operations together to be processed as a single unit.\n *\n * The AsyncBatcher provides a flexible way to implement async batching with configurable:\n * - Maximum batch size (number of items per batch)\n * - Time-based batching (process after X milliseconds)\n * - Custom batch processing logic via getShouldExecute\n * - Event callbacks for monitoring batch operations\n * - Error handling for failed batch operations\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and batcher instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the AsyncBatcher instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async batcher\n * - Use `onSuccess` callback to react to successful batch execution and implement custom logic\n * - Use `onError` callback to react to batch execution errors and implement custom error handling\n * - Use `onSettled` callback to react to batch execution completion (success or error) and implement custom logic\n * - Use `onExecute` callback to react to batch execution and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the batcher\n * - The state includes total items processed, success/error counts, and execution status\n * - State can be accessed via `asyncBatcher.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `asyncBatcher.state`\n *\n * @example\n * ```ts\n * const batcher = new AsyncBatcher<number>(\n *   async (items) => {\n *     const result = await processItems(items);\n *     console.log('Processing batch:', items);\n *     return result;\n *   },\n *   {\n *     maxSize: 5,\n *     wait: 2000,\n *     onSuccess: (result) => console.log('Batch succeeded:', result),\n *     onError: (error) => console.error('Batch failed:', error)\n *   }\n * );\n *\n * batcher.addItem(1);\n * batcher.addItem(2);\n * // After 2 seconds or when 5 items are added, whichever comes first,\n * // the batch will be processed and the result will be available\n * // batcher.execute() // manually trigger a batch\n * ```\n */\nexport class AsyncBatcher<TValue> {\n  readonly store: Store<Readonly<AsyncBatcherState<TValue>>> = new Store(\n    getDefaultAsyncBatcherState<TValue>(),\n  )\n  options: AsyncBatcherOptionsWithOptionalCallbacks<TValue>\n  #timeoutId: NodeJS.Timeout | null = null\n\n  constructor(\n    private fn: (items: Array<TValue>) => Promise<any>,\n    initialOptions: AsyncBatcherOptions<TValue>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n      throwOnError: initialOptions.throwOnError ?? !initialOptions.onError,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the async batcher options\n   */\n  setOptions = (newOptions: Partial<AsyncBatcherOptions<TValue>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<AsyncBatcherState<TValue>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const { isExecuting, isPending, items } = combinedState\n      const size = items.length\n      const isEmpty = size === 0\n      return {\n        ...combinedState,\n        isEmpty,\n        size,\n        status: isExecuting\n          ? 'executing'\n          : isPending\n            ? 'pending'\n            : isEmpty\n              ? 'idle'\n              : 'populated',\n      }\n    })\n  }\n\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait, this)\n  }\n\n  /**\n   * Adds an item to the async batcher\n   * If the batch size is reached, timeout occurs, or shouldProcess returns true, the batch will be processed\n   */\n  addItem = (item: TValue): void => {\n    this.#setState({\n      items: [...this.store.state.items, item],\n      isPending: this.options.wait !== Infinity,\n    })\n    this.options.onItemsChange?.(this)\n\n    const shouldProcess =\n      this.store.state.items.length >= this.options.maxSize ||\n      this.options.getShouldExecute(this.store.state.items, this)\n\n    if (shouldProcess) {\n      this.#execute()\n    } else if (this.options.wait !== Infinity) {\n      this.#clearTimeout() // clear any pending timeout to replace it with a new one\n      this.#timeoutId = setTimeout(() => this.#execute(), this.#getWait())\n    }\n  }\n\n  /**\n   * Processes the current batch of items asynchronously.\n   * This method will automatically be triggered if the batcher is running and any of these conditions are met:\n   * - The number of items reaches maxSize\n   * - The wait duration has elapsed\n   * - The getShouldExecute function returns true upon adding an item\n   *\n   * You can also call this method manually to process the current batch at any time.\n   *\n   * @returns A promise that resolves with the result of the batch function, or undefined if an error occurred and was handled by onError\n   * @throws The error from the batch function if no onError handler is configured\n   */\n  #execute = async (): Promise<any> => {\n    if (this.store.state.items.length === 0) {\n      return undefined\n    }\n\n    const batch = this.peekAllItems() // copy of the items to be processed (to prevent race conditions)\n    this.clear() // Clear items before processing to prevent race conditions\n    this.options.onItemsChange?.(this) // Call onItemsChange to notify listeners that the items have changed\n\n    this.#setState({ isExecuting: true })\n\n    try {\n      const result = await this.fn(batch) // EXECUTE\n      this.#setState({\n        totalItemsProcessed:\n          this.store.state.totalItemsProcessed + batch.length,\n        lastResult: result,\n        successCount: this.store.state.successCount + 1,\n      })\n      this.options.onSuccess?.(result, this)\n      return result\n    } catch (error) {\n      this.#setState({\n        errorCount: this.store.state.errorCount + 1,\n        failedItems: [...this.store.state.failedItems, ...batch],\n        totalItemsFailed: this.store.state.totalItemsFailed + batch.length,\n      })\n      this.options.onError?.(error, batch, this)\n      if (this.options.throwOnError) {\n        throw error\n      }\n      return undefined\n    } finally {\n      this.#setState({\n        isExecuting: false,\n        settleCount: this.store.state.settleCount + 1,\n      })\n      this.options.onSettled?.(this)\n      this.options.onExecute?.(this)\n    }\n  }\n\n  /**\n   * Processes the current batch of items immediately\n   */\n  flush = async (): Promise<any> => {\n    this.#clearTimeout() // clear any pending timeout\n    return await this.#execute()\n  }\n\n  /**\n   * Returns a copy of all items in the async batcher\n   */\n  peekAllItems = (): Array<TValue> => {\n    return [...this.store.state.items]\n  }\n\n  peekFailedItems = (): Array<TValue> => {\n    return [...this.store.state.failedItems]\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = null\n    }\n  }\n\n  /**\n   * Removes all items from the async batcher\n   */\n  clear = (): void => {\n    this.#setState({ items: [], failedItems: [], isPending: false })\n  }\n\n  /**\n   * Resets the async batcher state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultAsyncBatcherState<TValue>())\n    this.options.onItemsChange?.(this)\n  }\n}\n\n/**\n * Creates an async batcher that processes items in batches\n *\n * Unlike the sync batcher, this async version:\n * - Handles promises and returns results from batch executions\n * - Provides error handling with configurable error behavior\n * - Tracks success, error, and settle counts separately\n * - Has state tracking for when batches are executing\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and batcher instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncBatcher instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async batcher\n * - Use `onSuccess` callback to react to successful batch execution and implement custom logic\n * - Use `onError` callback to react to batch execution errors and implement custom error handling\n * - Use `onSettled` callback to react to batch execution completion (success or error) and implement custom logic\n * - Use `onExecute` callback to react to batch execution and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the batcher\n * - The state includes total items processed, success/error counts, and execution status\n * - State can be accessed via the underlying AsyncBatcher instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * @example\n * ```ts\n * const batchItems = asyncBatch<number>(\n *   async (items) => {\n *     const result = await processApiCall(items);\n *     console.log('Processing:', items);\n *     return result;\n *   },\n *   {\n *     maxSize: 3,\n *     wait: 1000,\n *     onSuccess: (result) => console.log('Batch succeeded:', result),\n *     onError: (error) => console.error('Batch failed:', error)\n *   }\n * );\n *\n * batchItems(1);\n * batchItems(2);\n * batchItems(3); // Triggers batch processing\n * ```\n */\nexport function asyncBatch<TValue>(\n  fn: (items: Array<TValue>) => Promise<any>,\n  options: AsyncBatcherOptions<TValue>,\n) {\n  const batcher = new AsyncBatcher<TValue>(fn, options)\n  return batcher.addItem\n}\n"],"names":["Store","parseFunctionOrValue"],"mappings":";;;;AA2DA,SAAS,8BAAiE;AACxE,SAAO;AAAA,IACL,YAAY;AAAA,IACZ,aAAa,CAAA;AAAA,IACb,SAAS;AAAA,IACT,aAAa;AAAA,IACb,WAAW;AAAA,IACX,OAAO,CAAA;AAAA,IACP,YAAY;AAAA,IACZ,aAAa;AAAA,IACb,MAAM;AAAA,IACN,QAAQ;AAAA,IACR,cAAc;AAAA,IACd,qBAAqB;AAAA,IACrB,kBAAkB;AAAA,EAAA;AAEtB;AA+EA,MAAM,iBAAgE;AAAA,EACpE,kBAAkB,MAAM;AAAA,EACxB,SAAS;AAAA,EACT,SAAS;AAAA,EACT,cAAc;AAAA,EACd,MAAM;AACR;AA+DO,MAAM,aAAqB;AAAA,EAOhC,YACU,IACR,gBACA;AAFQ,SAAA,KAAA;AAPV,SAAS,QAAoD,IAAIA,MAAAA;AAAAA,MAC/D,4BAAA;AAAA,IAAoC;AAGtC,SAAA,aAAoC;AAiBpC,SAAA,aAAa,CAAC,eAA2D;AACvE,WAAK,UAAU,EAAE,GAAG,KAAK,SAAS,GAAG,WAAA;AAAA,IAAW;AAGlD,SAAA,YAAY,CAAC,aAAuD;AAClE,WAAK,MAAM,SAAS,CAAC,UAAU;AAC7B,cAAM,gBAAgB;AAAA,UACpB,GAAG;AAAA,UACH,GAAG;AAAA,QAAA;AAEL,cAAM,EAAE,aAAa,WAAW,MAAA,IAAU;AAC1C,cAAM,OAAO,MAAM;AACnB,cAAM,UAAU,SAAS;AACzB,eAAO;AAAA,UACL,GAAG;AAAA,UACH;AAAA,UACA;AAAA,UACA,QAAQ,cACJ,cACA,YACE,YACA,UACE,SACA;AAAA,QAAA;AAAA,MACV,CACD;AAAA,IAAA;AAGH,SAAA,WAAW,MAAc;AACvB,aAAOC,MAAAA,qBAAqB,KAAK,QAAQ,MAAM,IAAI;AAAA,IAAA;AAOrD,SAAA,UAAU,CAAC,SAAuB;AAChC,WAAK,UAAU;AAAA,QACb,OAAO,CAAC,GAAG,KAAK,MAAM,MAAM,OAAO,IAAI;AAAA,QACvC,WAAW,KAAK,QAAQ,SAAS;AAAA,MAAA,CAClC;AACD,WAAK,QAAQ,gBAAgB,IAAI;AAEjC,YAAM,gBACJ,KAAK,MAAM,MAAM,MAAM,UAAU,KAAK,QAAQ,WAC9C,KAAK,QAAQ,iBAAiB,KAAK,MAAM,MAAM,OAAO,IAAI;AAE5D,UAAI,eAAe;AACjB,aAAK,SAAA;AAAA,MAAS,WACL,KAAK,QAAQ,SAAS,UAAU;AACzC,aAAK,cAAA;AACL,aAAK,aAAa,WAAW,MAAM,KAAK,YAAY,KAAK,UAAU;AAAA,MAAA;AAAA,IACrE;AAeF,SAAA,WAAW,YAA0B;AACnC,UAAI,KAAK,MAAM,MAAM,MAAM,WAAW,GAAG;AACvC,eAAO;AAAA,MAAA;AAGT,YAAM,QAAQ,KAAK,aAAA;AACnB,WAAK,MAAA;AACL,WAAK,QAAQ,gBAAgB,IAAI;AAEjC,WAAK,UAAU,EAAE,aAAa,KAAA,CAAM;AAEpC,UAAI;AACF,cAAM,SAAS,MAAM,KAAK,GAAG,KAAK;AAClC,aAAK,UAAU;AAAA,UACb,qBACE,KAAK,MAAM,MAAM,sBAAsB,MAAM;AAAA,UAC/C,YAAY;AAAA,UACZ,cAAc,KAAK,MAAM,MAAM,eAAe;AAAA,QAAA,CAC/C;AACD,aAAK,QAAQ,YAAY,QAAQ,IAAI;AACrC,eAAO;AAAA,MAAA,SACA,OAAO;AACd,aAAK,UAAU;AAAA,UACb,YAAY,KAAK,MAAM,MAAM,aAAa;AAAA,UAC1C,aAAa,CAAC,GAAG,KAAK,MAAM,MAAM,aAAa,GAAG,KAAK;AAAA,UACvD,kBAAkB,KAAK,MAAM,MAAM,mBAAmB,MAAM;AAAA,QAAA,CAC7D;AACD,aAAK,QAAQ,UAAU,OAAO,OAAO,IAAI;AACzC,YAAI,KAAK,QAAQ,cAAc;AAC7B,gBAAM;AAAA,QAAA;AAER,eAAO;AAAA,MAAA,UACT;AACE,aAAK,UAAU;AAAA,UACb,aAAa;AAAA,UACb,aAAa,KAAK,MAAM,MAAM,cAAc;AAAA,QAAA,CAC7C;AACD,aAAK,QAAQ,YAAY,IAAI;AAC7B,aAAK,QAAQ,YAAY,IAAI;AAAA,MAAA;AAAA,IAC/B;AAMF,SAAA,QAAQ,YAA0B;AAChC,WAAK,cAAA;AACL,aAAO,MAAM,KAAK,SAAA;AAAA,IAAS;AAM7B,SAAA,eAAe,MAAqB;AAClC,aAAO,CAAC,GAAG,KAAK,MAAM,MAAM,KAAK;AAAA,IAAA;AAGnC,SAAA,kBAAkB,MAAqB;AACrC,aAAO,CAAC,GAAG,KAAK,MAAM,MAAM,WAAW;AAAA,IAAA;AAGzC,SAAA,gBAAgB,MAAY;AAC1B,UAAI,KAAK,YAAY;AACnB,qBAAa,KAAK,UAAU;AAC5B,aAAK,aAAa;AAAA,MAAA;AAAA,IACpB;AAMF,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,EAAE,OAAO,CAAA,GAAI,aAAa,CAAA,GAAI,WAAW,OAAO;AAAA,IAAA;AAMjE,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,6BAAqC;AACpD,WAAK,QAAQ,gBAAgB,IAAI;AAAA,IAAA;AA9JjC,SAAK,UAAU;AAAA,MACb,GAAG;AAAA,MACH,GAAG;AAAA,MACH,cAAc,eAAe,gBAAgB,CAAC,eAAe;AAAA,IAAA;AAE/D,SAAK,UAAU,KAAK,QAAQ,gBAAgB,CAAA,CAAE;AAAA,EAAA;AAAA,EAXhD;AAAA,EAqBA;AAAA,EAwBA;AAAA,EAuCA;AAAA,EA6DA;AAqBF;AAmDO,SAAS,WACd,IACA,SACA;AACA,QAAM,UAAU,IAAI,aAAqB,IAAI,OAAO;AACpD,SAAO,QAAQ;AACjB;;;"}

dist/cjs/async-batcher.d.cts

@@ -25,6 +25,2 @@ import { Store } from '@tanstack/store';
     /**
-     * Whether the batcher is active and will process items automatically
-     */
-    isRunning: boolean;
-    /**
      * Array of items currently queued for batch processing
@@ -54,9 +50,9 @@ */
     /**
+     * Total number of items that have failed processing across all batches
+     */
+    totalItemsFailed: number;
+    /**
      * Total number of items that have been processed across all batches
      */
     totalItemsProcessed: number;
-    /**
-     * Total number of items that have failed processing across all batches
-     */
-    totalItemsFailed: number;
 }
@@ -204,10 +200,2 @@ /**
     /**
-     * Stops the async batcher from processing batches
-     */
-    stop: () => void;
-    /**
-     * Starts the async batcher and processes any pending items
-     */
-    start: () => void;
-    /**
      * Returns a copy of all items in the async batcher
@@ -214,0 +202,0 @@ */

dist/cjs/async-debouncer.cjs

@@ -31,2 +31,3 @@ "use strict";
     this.#resolvePreviousPromise = null;
+    this.#rejectPreviousPromise = null;
     this.setOptions = (newOptions) => {
@@ -69,4 +70,5 @@ this.options = { ...this.options, ...newOptions };
       }
-      return new Promise((resolve) => {
+      return new Promise((resolve, reject) => {
         this.#resolvePreviousPromise = resolve;
+        this.#rejectPreviousPromise = reject;
         this.#timeoutId = setTimeout(async () => {
@@ -99,3 +101,3 @@ if (this.options.trailing && this.store.state.lastArgs) {
         if (this.options.throwOnError) {
-          throw error;
+          this.#rejectPreviousPromiseInternal(error);
         }
@@ -113,9 +115,24 @@ } finally {
     };
-    this.flush = () => {
+    this.flush = async () => {
       if (this.store.state.isPending && this.store.state.lastArgs) {
         this.#abortExecution();
         this.#clearTimeout();
-        this.#execute(...this.store.state.lastArgs);
+        const result = await this.#execute(...this.store.state.lastArgs);
+        this.#resolvePreviousPromiseInternal();
+        return result;
       }
+      return void 0;
     };
+    this.#resolvePreviousPromiseInternal = () => {
+      if (this.#resolvePreviousPromise) {
+        this.#resolvePreviousPromise(this.store.state.lastResult);
+        this.#resolvePreviousPromise = null;
+      }
+    };
+    this.#rejectPreviousPromiseInternal = (error) => {
+      if (this.#rejectPreviousPromise) {
+        this.#rejectPreviousPromise(error);
+        this.#rejectPreviousPromise = null;
+      }
+    };
     this.#clearTimeout = () => {
@@ -129,6 +146,3 @@ if (this.#timeoutId) {
       this.#clearTimeout();
-      if (this.#resolvePreviousPromise) {
-        this.#resolvePreviousPromise(this.store.state.lastResult);
-        this.#resolvePreviousPromise = null;
-      }
+      this.#resolvePreviousPromiseInternal();
       this.#setState({
@@ -164,2 +178,3 @@ isPending: false,
   #resolvePreviousPromise;
+  #rejectPreviousPromise;
   #setState;
@@ -169,2 +184,4 @@ #getEnabled;
   #execute;
+  #resolvePreviousPromiseInternal;
+  #rejectPreviousPromiseInternal;
   #clearTimeout;
@@ -171,0 +188,0 @@ #cancelPendingExecution;

dist/cjs/async-debouncer.cjs.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"async-debouncer.cjs","sources":["../../src/async-debouncer.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { AnyAsyncFunction, OptionalKeys } from './types'\n\nexport interface AsyncDebouncerState<TFn extends AnyAsyncFunction> {\n  /**\n   * Whether the debouncer can execute on the leading edge of the timeout\n   */\n  canLeadingExecute: boolean\n  /**\n   * Number of function executions that have resulted in errors\n   */\n  errorCount: number\n  /**\n   * Whether the debounced function is currently executing asynchronously\n   */\n  isExecuting: boolean\n  /**\n   * Whether the debouncer is waiting for the timeout to trigger execution\n   */\n  isPending: boolean\n  /**\n   * The arguments from the most recent call to maybeExecute\n   */\n  lastArgs: Parameters<TFn> | undefined\n  /**\n   * The result from the most recent successful function execution\n   */\n  lastResult: ReturnType<TFn> | undefined\n  /**\n   * Number of function executions that have completed (either successfully or with errors)\n   */\n  settleCount: number\n  /**\n   * Current execution status - 'idle' when not active, 'pending' when waiting, 'executing' when running, 'settled' when completed\n   */\n  status: 'disabled' | 'idle' | 'pending' | 'executing' | 'settled'\n  /**\n   * Number of function executions that have completed successfully\n   */\n  successCount: number\n}\n\nfunction getDefaultAsyncDebouncerState<\n  TFn extends AnyAsyncFunction,\n>(): AsyncDebouncerState<TFn> {\n  return structuredClone({\n    canLeadingExecute: true,\n    errorCount: 0,\n    isExecuting: false,\n    isPending: false,\n    lastArgs: undefined,\n    lastResult: undefined,\n    settleCount: 0,\n    successCount: 0,\n    status: 'idle',\n  })\n}\n\n/**\n * Options for configuring an async debounced function\n */\nexport interface AsyncDebouncerOptions<TFn extends AnyAsyncFunction> {\n  /**\n   * Whether the debouncer is enabled. When disabled, maybeExecute will not trigger any executions.\n   * Can be a boolean or a function that returns a boolean.\n   * Defaults to true.\n   */\n  enabled?: boolean | ((debouncer: AsyncDebouncer<TFn>) => boolean)\n  /**\n   * Initial state for the async debouncer\n   */\n  initialState?: Partial<AsyncDebouncerState<TFn>>\n  /**\n   * Whether to execute on the leading edge of the timeout.\n   * Defaults to false.\n   */\n  leading?: boolean\n  /**\n   * Optional error handler for when the debounced function throws.\n   * If provided, the handler will be called with the error and debouncer instance.\n   * This can be used alongside throwOnError - the handler will be called before any error is thrown.\n   */\n  onError?: (error: unknown, debouncer: AsyncDebouncer<TFn>) => void\n  /**\n   * Optional callback to call when the debounced function is executed\n   */\n  onSettled?: (debouncer: AsyncDebouncer<TFn>) => void\n  /**\n   * Optional callback to call when the debounced function is executed\n   */\n  onSuccess?: (result: ReturnType<TFn>, debouncer: AsyncDebouncer<TFn>) => void\n  /**\n   * Whether to throw errors when they occur.\n   * Defaults to true if no onError handler is provided, false if an onError handler is provided.\n   * Can be explicitly set to override these defaults.\n   */\n  throwOnError?: boolean\n  /**\n   * Whether to execute on the trailing edge of the timeout.\n   * Defaults to true.\n   */\n  trailing?: boolean\n  /**\n   * Delay in milliseconds to wait after the last call before executing.\n   * Can be a number or a function that returns a number.\n   * Defaults to 0ms\n   */\n  wait: number | ((debouncer: AsyncDebouncer<TFn>) => number)\n}\n\ntype AsyncDebouncerOptionsWithOptionalCallbacks = OptionalKeys<\n  AsyncDebouncerOptions<any>,\n  'initialState' | 'onError' | 'onSettled' | 'onSuccess'\n>\n\nconst defaultOptions: AsyncDebouncerOptionsWithOptionalCallbacks = {\n  enabled: true,\n  leading: false,\n  trailing: true,\n  wait: 0,\n}\n\n/**\n * A class that creates an async debounced function.\n *\n * Debouncing ensures that a function is only executed after a specified delay has passed since its last invocation.\n * Each new invocation resets the delay timer. This is useful for handling frequent events like window resizing\n * or input changes where you only want to execute the handler after the events have stopped occurring.\n *\n * Unlike throttling which allows execution at regular intervals, debouncing prevents any execution until\n * the function stops being called for the specified delay period.\n *\n * Unlike the non-async Debouncer, this async version supports returning values from the debounced function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the debounced function.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and debouncer instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying store\n *\n * State Management:\n * - The debouncer uses a reactive store for state management\n * - Use `initialState` to provide initial state values when creating the async debouncer\n * - The state includes canLeadingExecute, error count, execution status, and success/settle counts\n * - State can be accessed via the `store` property and its `state` getter\n * - The store is reactive and will notify subscribers of state changes\n *\n * @example\n * ```ts\n * const asyncDebouncer = new AsyncDebouncer(async (value: string) => {\n *   const results = await searchAPI(value);\n *   return results; // Return value is preserved\n * }, {\n *   wait: 500,\n *   onError: (error) => {\n *     console.error('Search failed:', error);\n *   }\n * });\n *\n * // Called on each keystroke but only executes after 500ms of no typing\n * // Returns the API response directly\n * const results = await asyncDebouncer.maybeExecute(inputElement.value);\n * ```\n */\nexport class AsyncDebouncer<TFn extends AnyAsyncFunction> {\n  readonly store: Store<Readonly<AsyncDebouncerState<TFn>>> = new Store<\n    AsyncDebouncerState<TFn>\n  >(getDefaultAsyncDebouncerState<TFn>())\n  options: AsyncDebouncerOptions<TFn>\n  #abortController: AbortController | null = null\n  #timeoutId: NodeJS.Timeout | null = null\n  #resolvePreviousPromise:\n    | ((value?: ReturnType<TFn> | undefined) => void)\n    | null = null\n\n  constructor(\n    private fn: TFn,\n    initialOptions: AsyncDebouncerOptions<TFn>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n      throwOnError: initialOptions.throwOnError ?? !initialOptions.onError,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the async debouncer options\n   */\n  setOptions = (newOptions: Partial<AsyncDebouncerOptions<TFn>>): void => {\n    this.options = { ...this.options, ...newOptions }\n\n    // Cancel pending execution if the debouncer is disabled\n    if (!this.#getEnabled()) {\n      this.cancel()\n    }\n  }\n\n  #setState = (newState: Partial<AsyncDebouncerState<TFn>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const { isPending, isExecuting, settleCount } = combinedState\n      return {\n        ...combinedState,\n        status: !this.#getEnabled()\n          ? 'disabled'\n          : isPending\n            ? 'pending'\n            : isExecuting\n              ? 'executing'\n              : settleCount > 0\n                ? 'settled'\n                : 'idle',\n      }\n    })\n  }\n\n  /**\n   * Returns the current debouncer enabled state\n   */\n  #getEnabled = (): boolean => {\n    return !!parseFunctionOrValue(this.options.enabled, this)\n  }\n\n  /**\n   * Returns the current debouncer wait state\n   */\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait, this)\n  }\n\n  /**\n   * Attempts to execute the debounced function.\n   * If a call is already in progress, it will be queued.\n   *\n   * Error Handling:\n   * - If the debounced function throws and no `onError` handler is configured,\n   *   the error will be thrown from this method.\n   * - If an `onError` handler is configured, errors will be caught and passed to the handler,\n   *   and this method will return undefined.\n   * - The error state can be checked using `getErrorCount()` and `getIsExecuting()`.\n   *\n   * @returns A promise that resolves with the function's return value, or undefined if an error occurred and was handled by onError\n   * @throws The error from the debounced function if no onError handler is configured\n   */\n  maybeExecute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    if (!this.#getEnabled()) return undefined\n    this.#cancelPendingExecution()\n    this.#setState({ lastArgs: args })\n\n    // Handle leading execution\n    if (this.options.leading && this.store.state.canLeadingExecute) {\n      this.#setState({ canLeadingExecute: false })\n      await this.#execute(...args)\n      return this.store.state.lastResult\n    }\n\n    // Handle trailing execution\n    if (this.options.trailing && this.#getEnabled()) {\n      this.#setState({ isPending: true })\n    }\n\n    return new Promise((resolve) => {\n      this.#resolvePreviousPromise = resolve\n      this.#timeoutId = setTimeout(async () => {\n        // Execute trailing if enabled\n        if (this.options.trailing && this.store.state.lastArgs) {\n          await this.#execute(...this.store.state.lastArgs)\n        }\n\n        // Reset state and resolve\n        this.#setState({ canLeadingExecute: true })\n        this.#resolvePreviousPromise = null\n        resolve(this.store.state.lastResult)\n      }, this.#getWait())\n    })\n  }\n\n  #execute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    if (!this.#getEnabled()) return undefined\n    this.#abortController = new AbortController()\n    try {\n      this.#setState({ isExecuting: true })\n      const result = await this.fn(...args) // EXECUTE!\n      this.#setState({\n        lastResult: result,\n        successCount: this.store.state.successCount + 1,\n      })\n      this.options.onSuccess?.(result, this)\n    } catch (error) {\n      this.#setState({\n        errorCount: this.store.state.errorCount + 1,\n      })\n      this.options.onError?.(error, this)\n      if (this.options.throwOnError) {\n        throw error\n      }\n    } finally {\n      this.#setState({\n        isExecuting: false,\n        isPending: false,\n        settleCount: this.store.state.settleCount + 1,\n      })\n      this.#abortController = null\n      this.options.onSettled?.(this)\n    }\n    return this.store.state.lastResult\n  }\n\n  /**\n   * Processes the current pending execution immediately\n   */\n  flush = (): void => {\n    if (this.store.state.isPending && this.store.state.lastArgs) {\n      this.#abortExecution() // abort any current execution\n      this.#clearTimeout() // clear any existing timeout\n      this.#execute(...this.store.state.lastArgs)\n    }\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = null\n    }\n  }\n\n  #cancelPendingExecution = (): void => {\n    this.#clearTimeout()\n    if (this.#resolvePreviousPromise) {\n      this.#resolvePreviousPromise(this.store.state.lastResult)\n      this.#resolvePreviousPromise = null\n    }\n    this.#setState({\n      isPending: false,\n      isExecuting: false,\n      lastArgs: undefined,\n    })\n  }\n\n  #abortExecution = (): void => {\n    if (this.#abortController) {\n      this.#abortController.abort()\n      this.#abortController = null\n    }\n  }\n\n  /**\n   * Cancels any pending execution or aborts any execution in progress\n   */\n  cancel = (): void => {\n    this.#cancelPendingExecution()\n    this.#abortExecution()\n    this.#setState({ canLeadingExecute: true })\n  }\n\n  /**\n   * Resets the debouncer state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultAsyncDebouncerState<TFn>())\n  }\n}\n\n/**\n * Creates an async debounced function that delays execution until after a specified wait time.\n * The debounced function will only execute once the wait period has elapsed without any new calls.\n * If called again during the wait period, the timer resets and a new wait period begins.\n *\n * Unlike the non-async Debouncer, this async version supports returning values from the debounced function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the debounced function.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and debouncer instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - The error state can be checked using the underlying AsyncDebouncer instance\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async debouncer\n * - Use `onSuccess` callback to react to successful function execution and implement custom logic\n * - Use `onError` callback to react to function execution errors and implement custom error handling\n * - Use `onSettled` callback to react to function execution completion (success or error) and implement custom logic\n * - The state includes canLeadingExecute, error count, execution status, and success/settle counts\n * - State can be accessed via `asyncDebouncer.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `asyncDebouncer.state`\n *\n * @example\n * ```ts\n * const debounced = asyncDebounce(async (value: string) => {\n *   const result = await saveToAPI(value);\n *   return result; // Return value is preserved\n * }, {\n *   wait: 1000,\n *   onError: (error) => {\n *     console.error('API call failed:', error);\n *   },\n *   throwOnError: true // Will both log the error and throw it\n * });\n *\n * // Will only execute once, 1 second after the last call\n * // Returns the API response directly\n * const result = await debounced(\"third\");\n * ```\n */\nexport function asyncDebounce<TFn extends AnyAsyncFunction>(\n  fn: TFn,\n  initialOptions: AsyncDebouncerOptions<TFn>,\n) {\n  const asyncDebouncer = new AsyncDebouncer(fn, initialOptions)\n  return 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+{"version":3,"file":"async-debouncer.cjs","sources":["../../src/async-debouncer.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { AnyAsyncFunction, OptionalKeys } from './types'\n\nexport interface AsyncDebouncerState<TFn extends AnyAsyncFunction> {\n  /**\n   * Whether the debouncer can execute on the leading edge of the timeout\n   */\n  canLeadingExecute: boolean\n  /**\n   * Number of function executions that have resulted in errors\n   */\n  errorCount: number\n  /**\n   * Whether the debounced function is currently executing asynchronously\n   */\n  isExecuting: boolean\n  /**\n   * Whether the debouncer is waiting for the timeout to trigger execution\n   */\n  isPending: boolean\n  /**\n   * The arguments from the most recent call to maybeExecute\n   */\n  lastArgs: Parameters<TFn> | undefined\n  /**\n   * The result from the most recent successful function execution\n   */\n  lastResult: ReturnType<TFn> | undefined\n  /**\n   * Number of function executions that have completed (either successfully or with errors)\n   */\n  settleCount: number\n  /**\n   * Current execution status - 'idle' when not active, 'pending' when waiting, 'executing' when running, 'settled' when completed\n   */\n  status: 'disabled' | 'idle' | 'pending' | 'executing' | 'settled'\n  /**\n   * Number of function executions that have completed successfully\n   */\n  successCount: number\n}\n\nfunction getDefaultAsyncDebouncerState<\n  TFn extends AnyAsyncFunction,\n>(): AsyncDebouncerState<TFn> {\n  return structuredClone({\n    canLeadingExecute: true,\n    errorCount: 0,\n    isExecuting: false,\n    isPending: false,\n    lastArgs: undefined,\n    lastResult: undefined,\n    settleCount: 0,\n    successCount: 0,\n    status: 'idle',\n  })\n}\n\n/**\n * Options for configuring an async debounced function\n */\nexport interface AsyncDebouncerOptions<TFn extends AnyAsyncFunction> {\n  /**\n   * Whether the debouncer is enabled. When disabled, maybeExecute will not trigger any executions.\n   * Can be a boolean or a function that returns a boolean.\n   * Defaults to true.\n   */\n  enabled?: boolean | ((debouncer: AsyncDebouncer<TFn>) => boolean)\n  /**\n   * Initial state for the async debouncer\n   */\n  initialState?: Partial<AsyncDebouncerState<TFn>>\n  /**\n   * Whether to execute on the leading edge of the timeout.\n   * Defaults to false.\n   */\n  leading?: boolean\n  /**\n   * Optional error handler for when the debounced function throws.\n   * If provided, the handler will be called with the error and debouncer instance.\n   * This can be used alongside throwOnError - the handler will be called before any error is thrown.\n   */\n  onError?: (error: unknown, debouncer: AsyncDebouncer<TFn>) => void\n  /**\n   * Optional callback to call when the debounced function is executed\n   */\n  onSettled?: (debouncer: AsyncDebouncer<TFn>) => void\n  /**\n   * Optional callback to call when the debounced function is executed\n   */\n  onSuccess?: (result: ReturnType<TFn>, debouncer: AsyncDebouncer<TFn>) => void\n  /**\n   * Whether to throw errors when they occur.\n   * Defaults to true if no onError handler is provided, false if an onError handler is provided.\n   * Can be explicitly set to override these defaults.\n   */\n  throwOnError?: boolean\n  /**\n   * Whether to execute on the trailing edge of the timeout.\n   * Defaults to true.\n   */\n  trailing?: boolean\n  /**\n   * Delay in milliseconds to wait after the last call before executing.\n   * Can be a number or a function that returns a number.\n   * Defaults to 0ms\n   */\n  wait: number | ((debouncer: AsyncDebouncer<TFn>) => number)\n}\n\ntype AsyncDebouncerOptionsWithOptionalCallbacks = OptionalKeys<\n  AsyncDebouncerOptions<any>,\n  'initialState' | 'onError' | 'onSettled' | 'onSuccess'\n>\n\nconst defaultOptions: AsyncDebouncerOptionsWithOptionalCallbacks = {\n  enabled: true,\n  leading: false,\n  trailing: true,\n  wait: 0,\n}\n\n/**\n * A class that creates an async debounced function.\n *\n * Debouncing ensures that a function is only executed after a specified delay has passed since its last invocation.\n * Each new invocation resets the delay timer. This is useful for handling frequent events like window resizing\n * or input changes where you only want to execute the handler after the events have stopped occurring.\n *\n * Unlike throttling which allows execution at regular intervals, debouncing prevents any execution until\n * the function stops being called for the specified delay period.\n *\n * Unlike the non-async Debouncer, this async version supports returning values from the debounced function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the debounced function.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and debouncer instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying store\n *\n * State Management:\n * - The debouncer uses a reactive store for state management\n * - Use `initialState` to provide initial state values when creating the async debouncer\n * - The state includes canLeadingExecute, error count, execution status, and success/settle counts\n * - State can be accessed via the `store` property and its `state` getter\n * - The store is reactive and will notify subscribers of state changes\n *\n * @example\n * ```ts\n * const asyncDebouncer = new AsyncDebouncer(async (value: string) => {\n *   const results = await searchAPI(value);\n *   return results; // Return value is preserved\n * }, {\n *   wait: 500,\n *   onError: (error) => {\n *     console.error('Search failed:', error);\n *   }\n * });\n *\n * // Called on each keystroke but only executes after 500ms of no typing\n * // Returns the API response directly\n * const results = await asyncDebouncer.maybeExecute(inputElement.value);\n * ```\n */\nexport class AsyncDebouncer<TFn extends AnyAsyncFunction> {\n  readonly store: Store<Readonly<AsyncDebouncerState<TFn>>> = new Store<\n    AsyncDebouncerState<TFn>\n  >(getDefaultAsyncDebouncerState<TFn>())\n  options: AsyncDebouncerOptions<TFn>\n  #abortController: AbortController | null = null\n  #timeoutId: NodeJS.Timeout | null = null\n  #resolvePreviousPromise:\n    | ((value?: ReturnType<TFn> | undefined) => void)\n    | null = null\n  #rejectPreviousPromise: ((reason?: unknown) => void) | null = null\n\n  constructor(\n    private fn: TFn,\n    initialOptions: AsyncDebouncerOptions<TFn>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n      throwOnError: initialOptions.throwOnError ?? !initialOptions.onError,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the async debouncer options\n   */\n  setOptions = (newOptions: Partial<AsyncDebouncerOptions<TFn>>): void => {\n    this.options = { ...this.options, ...newOptions }\n\n    // Cancel pending execution if the debouncer is disabled\n    if (!this.#getEnabled()) {\n      this.cancel()\n    }\n  }\n\n  #setState = (newState: Partial<AsyncDebouncerState<TFn>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const { isPending, isExecuting, settleCount } = combinedState\n      return {\n        ...combinedState,\n        status: !this.#getEnabled()\n          ? 'disabled'\n          : isPending\n            ? 'pending'\n            : isExecuting\n              ? 'executing'\n              : settleCount > 0\n                ? 'settled'\n                : 'idle',\n      }\n    })\n  }\n\n  /**\n   * Returns the current debouncer enabled state\n   */\n  #getEnabled = (): boolean => {\n    return !!parseFunctionOrValue(this.options.enabled, this)\n  }\n\n  /**\n   * Returns the current debouncer wait state\n   */\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait, this)\n  }\n\n  /**\n   * Attempts to execute the debounced function.\n   * If a call is already in progress, it will be queued.\n   *\n   * Error Handling:\n   * - If the debounced function throws and no `onError` handler is configured,\n   *   the error will be thrown from this method.\n   * - If an `onError` handler is configured, errors will be caught and passed to the handler,\n   *   and this method will return undefined.\n   * - The error state can be checked using `getErrorCount()` and `getIsExecuting()`.\n   *\n   * @returns A promise that resolves with the function's return value, or undefined if an error occurred and was handled by onError\n   * @throws The error from the debounced function if no onError handler is configured\n   */\n  maybeExecute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    if (!this.#getEnabled()) return undefined\n    this.#cancelPendingExecution()\n    this.#setState({ lastArgs: args })\n\n    // Handle leading execution\n    if (this.options.leading && this.store.state.canLeadingExecute) {\n      this.#setState({ canLeadingExecute: false })\n      await this.#execute(...args)\n      return this.store.state.lastResult\n    }\n\n    // Handle trailing execution\n    if (this.options.trailing && this.#getEnabled()) {\n      this.#setState({ isPending: true })\n    }\n\n    return new Promise((resolve, reject) => {\n      this.#resolvePreviousPromise = resolve\n      this.#rejectPreviousPromise = reject\n      this.#timeoutId = setTimeout(async () => {\n        // Execute trailing if enabled\n        if (this.options.trailing && this.store.state.lastArgs) {\n          await this.#execute(...this.store.state.lastArgs)\n        }\n\n        // Reset state and resolve\n        this.#setState({ canLeadingExecute: true })\n        this.#resolvePreviousPromise = null\n        resolve(this.store.state.lastResult)\n      }, this.#getWait())\n    })\n  }\n\n  #execute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    if (!this.#getEnabled()) return undefined\n    this.#abortController = new AbortController()\n    try {\n      this.#setState({ isExecuting: true })\n      const result = await this.fn(...args) // EXECUTE!\n      this.#setState({\n        lastResult: result,\n        successCount: this.store.state.successCount + 1,\n      })\n      this.options.onSuccess?.(result, this)\n    } catch (error) {\n      this.#setState({\n        errorCount: this.store.state.errorCount + 1,\n      })\n      this.options.onError?.(error, this)\n      if (this.options.throwOnError) {\n        this.#rejectPreviousPromiseInternal(error)\n      }\n    } finally {\n      this.#setState({\n        isExecuting: false,\n        isPending: false,\n        settleCount: this.store.state.settleCount + 1,\n      })\n      this.#abortController = null\n      this.options.onSettled?.(this)\n    }\n    return this.store.state.lastResult\n  }\n\n  /**\n   * Processes the current pending execution immediately\n   */\n  flush = async (): Promise<ReturnType<TFn> | undefined> => {\n    if (this.store.state.isPending && this.store.state.lastArgs) {\n      this.#abortExecution() // abort any current execution\n      this.#clearTimeout() // clear any existing timeout\n      const result = await this.#execute(...this.store.state.lastArgs)\n\n      // Resolve any pending promise from maybeExecute\n      this.#resolvePreviousPromiseInternal()\n\n      return result\n    }\n    return undefined\n  }\n\n  #resolvePreviousPromiseInternal = (): void => {\n    if (this.#resolvePreviousPromise) {\n      this.#resolvePreviousPromise(this.store.state.lastResult)\n      this.#resolvePreviousPromise = null\n    }\n  }\n\n  #rejectPreviousPromiseInternal = (error: unknown): void => {\n    if (this.#rejectPreviousPromise) {\n      this.#rejectPreviousPromise(error)\n      this.#rejectPreviousPromise = null\n    }\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = null\n    }\n  }\n\n  #cancelPendingExecution = (): void => {\n    this.#clearTimeout()\n    this.#resolvePreviousPromiseInternal()\n    this.#setState({\n      isPending: false,\n      isExecuting: false,\n      lastArgs: undefined,\n    })\n  }\n\n  #abortExecution = (): void => {\n    if (this.#abortController) {\n      this.#abortController.abort()\n      this.#abortController = null\n    }\n  }\n\n  /**\n   * Cancels any pending execution or aborts any execution in progress\n   */\n  cancel = (): void => {\n    this.#cancelPendingExecution()\n    this.#abortExecution()\n    this.#setState({ canLeadingExecute: true })\n  }\n\n  /**\n   * Resets the debouncer state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultAsyncDebouncerState<TFn>())\n  }\n}\n\n/**\n * Creates an async debounced function that delays execution until after a specified wait time.\n * The debounced function will only execute once the wait period has elapsed without any new calls.\n * If called again during the wait period, the timer resets and a new wait period begins.\n *\n * Unlike the non-async Debouncer, this async version supports returning values from the debounced function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the debounced function.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and debouncer instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - The error state can be checked using the underlying AsyncDebouncer instance\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async debouncer\n * - Use `onSuccess` callback to react to successful function execution and implement custom logic\n * - Use `onError` callback to react to function execution errors and implement custom error handling\n * - Use `onSettled` callback to react to function execution completion (success or error) and implement custom logic\n * - The state includes canLeadingExecute, error count, execution status, and success/settle counts\n * - State can be accessed via `asyncDebouncer.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `asyncDebouncer.state`\n *\n * @example\n * ```ts\n * const debounced = asyncDebounce(async (value: string) => {\n *   const result = await saveToAPI(value);\n *   return result; // Return value is preserved\n * }, {\n *   wait: 1000,\n *   onError: (error) => {\n *     console.error('API call failed:', error);\n *   },\n *   throwOnError: true // Will both log the error and throw it\n * });\n *\n * // Will only execute once, 1 second after the last call\n * // Returns the API response directly\n * const result = await debounced(\"third\");\n * ```\n */\nexport function asyncDebounce<TFn extends AnyAsyncFunction>(\n  fn: TFn,\n  initialOptions: AsyncDebouncerOptions<TFn>,\n) {\n  const asyncDebouncer = new AsyncDebouncer(fn, initialOptions)\n  return 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dist/cjs/async-debouncer.d.cts

@@ -165,3 +165,3 @@ import { Store } from '@tanstack/store';
      */
-    flush: () => void;
+    flush: () => Promise<ReturnType<TFn> | undefined>;
     /**
@@ -168,0 +168,0 @@ * Cancels any pending execution or aborts any execution in progress

dist/cjs/async-queuer.cjs

@@ -173,2 +173,7 @@ "use strict";
     };
+    this.#getAllItems = () => {
+      const items = this.peekAllItems();
+      this.clear();
+      return items;
+    };
     this.execute = async (position) => {
@@ -204,8 +209,13 @@ const item = this.getNextItem(position);
     };
-    this.flush = (numberOfItems = this.store.state.items.length, position) => {
+    this.flush = async (numberOfItems = this.store.state.items.length, position) => {
       this.#clearTimeouts();
-      for (let i = 0; i < numberOfItems; i++) {
-        this.execute(position);
-      }
+      await Promise.all(
+        Array.from({ length: numberOfItems }, () => this.execute(position))
+      );
     };
+    this.flushAsBatch = async (batchFunction) => {
+      this.#clearTimeouts();
+      const items = this.#getAllItems();
+      await batchFunction(items);
+    };
     this.#checkExpiredItems = () => {
@@ -311,2 +321,3 @@ if ((this.options.expirationDuration ?? Infinity) === Infinity && this.options.getIsExpired === defaultOptions.getIsExpired) {
   #tick;
+  #getAllItems;
   #checkExpiredItems;
@@ -313,0 +324,0 @@ #clearTimeouts;

dist/cjs/async-queuer.cjs.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"async-queuer.cjs","sources":["../../src/async-queuer.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { OptionalKeys } from './types'\nimport type { QueuePosition } from './queuer'\n\nexport interface AsyncQueuerState<TValue> {\n  /**\n   * Items currently being processed by the queuer\n   */\n  activeItems: Array<TValue>\n  /**\n   * Number of task executions that have resulted in errors\n   */\n  errorCount: number\n  /**\n   * Number of items that have been removed from the queue due to expiration\n   */\n  expirationCount: number\n  /**\n   * Whether the queuer has no items to process (items array is empty)\n   */\n  isEmpty: boolean\n  /**\n   * Whether the queuer has reached its maximum capacity\n   */\n  isFull: boolean\n  /**\n   * Whether the queuer is not currently processing any items\n   */\n  isIdle: boolean\n  /**\n   * Whether the queuer is active and will process items automatically\n   */\n  isRunning: boolean\n  /**\n   * Timestamps when items were added to the queue for expiration tracking\n   */\n  itemTimestamps: Array<number>\n  /**\n   * Array of items currently waiting to be processed\n   */\n  items: Array<TValue>\n  /**\n   * The result from the most recent task execution\n   */\n  lastResult: any\n  /**\n   * Whether the queuer has a pending timeout for processing the next item\n   */\n  pendingTick: boolean\n  /**\n   * Number of items that have been rejected from being added to the queue\n   */\n  rejectionCount: number\n  /**\n   * Number of task executions that have completed (either successfully or with errors)\n   */\n  settledCount: number\n  /**\n   * Number of items currently in the queue\n   */\n  size: number\n  /**\n   * Current processing status - 'idle' when not processing, 'running' when active, 'stopped' when paused\n   */\n  status: 'idle' | 'running' | 'stopped'\n  /**\n   * Number of task executions that have completed successfully\n   */\n  successCount: number\n}\n\nfunction getDefaultAsyncQueuerState<TValue>(): AsyncQueuerState<TValue> {\n  return structuredClone({\n    activeItems: [],\n    errorCount: 0,\n    expirationCount: 0,\n    isEmpty: true,\n    isFull: false,\n    isIdle: true,\n    isRunning: true,\n    itemTimestamps: [],\n    items: [],\n    lastResult: null,\n    pendingTick: false,\n    rejectionCount: 0,\n    settledCount: 0,\n    size: 0,\n    status: 'idle',\n    successCount: 0,\n  })\n}\n\nexport interface AsyncQueuerOptions<TValue> {\n  /**\n   * Default position to add items to the queuer\n   * @default 'back'\n   */\n  addItemsTo?: QueuePosition\n  /**\n   * Maximum number of concurrent tasks to process.\n   * Can be a number or a function that returns a number.\n   * @default 1\n   */\n  concurrency?: number | ((queuer: AsyncQueuer<TValue>) => number)\n  /**\n   * Maximum time in milliseconds that an item can stay in the queue\n   * If not provided, items will never expire\n   */\n  expirationDuration?: number\n  /**\n   * Function to determine if an item has expired\n   * If provided, this overrides the expirationDuration behavior\n   */\n  getIsExpired?: (item: TValue, addedAt: number) => boolean\n  /**\n   * Default position to get items from during processing\n   * @default 'front'\n   */\n  getItemsFrom?: QueuePosition\n  /**\n   * Function to determine priority of items in the queuer\n   * Higher priority items will be processed first\n   * If not provided, will use static priority values attached to tasks\n   */\n  getPriority?: (item: TValue) => number\n  /**\n   * Initial items to populate the queuer with\n   */\n  initialItems?: Array<TValue>\n  /**\n   * Initial state for the async queuer\n   */\n  initialState?: Partial<AsyncQueuerState<TValue>>\n  /**\n   * Maximum number of items allowed in the queuer\n   */\n  maxSize?: number\n  /**\n   * Optional error handler for when a task throws.\n   * If provided, the handler will be called with the error and queuer instance.\n   * This can be used alongside throwOnError - the handler will be called before any error is thrown.\n   */\n  onError?: (error: unknown, queuer: AsyncQueuer<TValue>) => void\n  /**\n   * Callback fired whenever an item expires in the queuer\n   */\n  onExpire?: (item: TValue, queuer: AsyncQueuer<TValue>) => void\n  /**\n   * Callback fired whenever an item is added or removed from the queuer\n   */\n  onItemsChange?: (queuer: AsyncQueuer<TValue>) => void\n  /**\n   * Callback fired whenever an item is rejected from being added to the queuer\n   */\n  onReject?: (item: TValue, queuer: AsyncQueuer<TValue>) => void\n  /**\n   * Optional callback to call when a task is settled\n   */\n  onSettled?: (queuer: AsyncQueuer<TValue>) => void\n  /**\n   * Optional callback to call when a task succeeds\n   */\n  onSuccess?: (result: TValue, queuer: AsyncQueuer<TValue>) => void\n  /**\n   * Whether the queuer should start processing tasks immediately or not.\n   */\n  started?: boolean\n  /**\n   * Whether to throw errors when they occur.\n   * Defaults to true if no onError handler is provided, false if an onError handler is provided.\n   * Can be explicitly set to override these defaults.\n   */\n  throwOnError?: boolean\n  /**\n   * Time in milliseconds to wait between processing items.\n   * Can be a number or a function that returns a number.\n   * @default 0\n   */\n  wait?: number | ((queuer: AsyncQueuer<TValue>) => number)\n}\n\ntype AsyncQueuerOptionsWithOptionalCallbacks = OptionalKeys<\n  Required<AsyncQueuerOptions<any>>,\n  | 'initialState'\n  | 'throwOnError'\n  | 'onSuccess'\n  | 'onSettled'\n  | 'onReject'\n  | 'onItemsChange'\n  | 'onExpire'\n  | 'onError'\n>\n\nconst defaultOptions: AsyncQueuerOptionsWithOptionalCallbacks = {\n  addItemsTo: 'back',\n  concurrency: 1,\n  expirationDuration: Infinity,\n  getIsExpired: () => false,\n  getItemsFrom: 'front',\n  getPriority: (item: any) => item?.priority ?? 0,\n  initialItems: [],\n  maxSize: Infinity,\n  started: true,\n  wait: 0,\n}\n\n/**\n * A flexible asynchronous queue for processing tasks with configurable concurrency, priority, and expiration.\n *\n * Features:\n * - Priority queue support via the getPriority option\n * - Configurable concurrency limit\n * - Callbacks for task success, error, completion, and queue state changes\n * - FIFO (First In First Out) or LIFO (Last In First Out) queue behavior\n * - Pause and resume processing\n * - Task cancellation\n * - Item expiration to remove stale items from the queue\n *\n * Tasks are processed concurrently up to the configured concurrency limit. When a task completes,\n * the next pending task is processed if the concurrency limit allows.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and queuer instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together; the handler will be called before any error is thrown\n * - The error state can be checked using the AsyncQueuer instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async queuer\n * - Use `onSuccess` callback to react to successful task execution and implement custom logic\n * - Use `onError` callback to react to task execution errors and implement custom error handling\n * - Use `onSettled` callback to react to task execution completion (success or error) and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the queue\n * - Use `onExpire` callback to react to items expiring and implement custom logic\n * - Use `onReject` callback to react to items being rejected when the queue is full\n * - The state includes error count, expiration count, rejection count, running status, and success/settle counts\n * - State can be accessed via `asyncQueuer.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `asyncQueuer.state`\n *\n * Example usage:\n * ```ts\n * const asyncQueuer = new AsyncQueuer<string>(async (item) => {\n *   // process item\n *   return item.toUpperCase();\n * }, {\n *   concurrency: 2,\n *   onSuccess: (result) => {\n *     console.log(result);\n *   }\n * });\n *\n * asyncQueuer.addItem('hello');\n * asyncQueuer.start();\n * ```\n */\nexport class AsyncQueuer<TValue> {\n  readonly store: Store<Readonly<AsyncQueuerState<TValue>>> = new Store<\n    AsyncQueuerState<TValue>\n  >(getDefaultAsyncQueuerState<TValue>())\n  options: AsyncQueuerOptions<TValue>\n  #timeoutIds: Set<NodeJS.Timeout> = new Set()\n\n  constructor(\n    private fn: (item: TValue) => Promise<any>,\n    initialOptions: AsyncQueuerOptions<TValue> = {},\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n      throwOnError: initialOptions.throwOnError ?? !initialOptions.onError,\n    }\n    const isInitiallyRunning =\n      this.options.initialState?.isRunning ?? this.options.started ?? true\n    this.#setState({\n      ...this.options.initialState,\n      isRunning: isInitiallyRunning,\n    })\n\n    if (this.options.initialState?.items) {\n      if (this.store.state.isRunning) {\n        this.#tick()\n      }\n    } else {\n      for (let i = 0; i < (this.options.initialItems?.length ?? 0); i++) {\n        const item = this.options.initialItems![i]!\n        const isLast = i === (this.options.initialItems?.length ?? 0) - 1\n        this.addItem(item, this.options.addItemsTo ?? 'back', isLast)\n      }\n    }\n  }\n\n  /**\n   * Updates the queuer options. New options are merged with existing options.\n   */\n  setOptions = (newOptions: Partial<AsyncQueuerOptions<TValue>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<AsyncQueuerState<TValue>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n\n      const { activeItems, items, isRunning } = combinedState\n\n      const size = items.length\n      const isFull = size >= (this.options.maxSize ?? Infinity)\n      const isEmpty = size === 0\n      const isIdle = isRunning && isEmpty && activeItems.length === 0\n\n      const status = isIdle ? 'idle' : isRunning ? 'running' : 'stopped'\n\n      return {\n        ...combinedState,\n        isEmpty,\n        isFull,\n        isIdle,\n        size,\n        status,\n      }\n    })\n  }\n\n  /**\n   * Returns the current wait time (in milliseconds) between processing items.\n   * If a function is provided, it is called with the queuer instance.\n   */\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait ?? 0, this)\n  }\n\n  /**\n   * Returns the current concurrency limit for processing items.\n   * If a function is provided, it is called with the queuer instance.\n   */\n  #getConcurrency = (): number => {\n    return parseFunctionOrValue(this.options.concurrency ?? 1, this)\n  }\n\n  /**\n   * Processes items in the queue up to the concurrency limit. Internal use only.\n   */\n  #tick = () => {\n    if (!this.store.state.isRunning) {\n      this.#setState({ pendingTick: false })\n      return\n    }\n    this.#setState({ pendingTick: true })\n\n    // Check for expired items\n    this.#checkExpiredItems()\n\n    // Process items concurrently up to the concurrency limit\n    const activeItems = this.store.state.activeItems\n    while (\n      activeItems.length < this.#getConcurrency() &&\n      this.store.state.items.length > 0\n    ) {\n      const nextItem = this.peekNextItem()\n      if (!nextItem) {\n        break\n      }\n      activeItems.push(nextItem)\n      this.#setState({\n        activeItems,\n      })\n      ;(async () => {\n        const result = await this.execute()\n        this.#setState({ lastResult: result })\n\n        const wait = this.#getWait()\n        if (wait > 0) {\n          const timeoutId = setTimeout(() => this.#tick(), wait)\n          this.#timeoutIds.add(timeoutId)\n          return\n        }\n\n        this.#tick()\n      })()\n    }\n\n    this.#setState({ pendingTick: false })\n  }\n\n  /**\n   * Adds an item to the queue. If the queue is full, the item is rejected and onReject is called.\n   * Items can be inserted based on priority or at the front/back depending on configuration.\n   *\n   * @example\n   * ```ts\n   * queuer.addItem({ value: 'task', priority: 10 });\n   * queuer.addItem('task2', 'front');\n   * ```\n   */\n  addItem = (\n    item: TValue,\n    position: QueuePosition = this.options.addItemsTo ?? 'back',\n    runOnItemsChange: boolean = true,\n  ): boolean => {\n    if (this.store.state.items.length >= (this.options.maxSize ?? Infinity)) {\n      this.#setState({\n        rejectionCount: this.store.state.rejectionCount + 1,\n      })\n      this.options.onReject?.(item, this)\n      return false\n    }\n\n    // Get priority either from the function or from getPriority option\n    const priority =\n      this.options.getPriority !== defaultOptions.getPriority\n        ? this.options.getPriority!(item)\n        : (item as any).priority\n\n    const items = this.store.state.items\n    const itemTimestamps = this.store.state.itemTimestamps\n\n    if (priority !== undefined) {\n      // Insert based on priority - higher priority items go to front\n      const insertIndex = items.findIndex((existing) => {\n        const existingPriority =\n          this.options.getPriority !== defaultOptions.getPriority\n            ? this.options.getPriority!(existing)\n            : (existing as any).priority\n        return existingPriority < priority\n      })\n\n      if (insertIndex === -1) {\n        items.push(item)\n        itemTimestamps.push(Date.now())\n      } else {\n        items.splice(insertIndex, 0, item)\n        itemTimestamps.splice(insertIndex, 0, Date.now())\n      }\n    } else {\n      if (position === 'front') {\n        // Default FIFO/LIFO behavior\n        items.unshift(item)\n        itemTimestamps.unshift(Date.now())\n      } else {\n        // LIFO\n        items.push(item)\n        itemTimestamps.push(Date.now())\n      }\n    }\n\n    this.#setState({\n      items,\n      itemTimestamps,\n    })\n\n    if (runOnItemsChange) {\n      this.options.onItemsChange?.(this)\n    }\n\n    if (this.store.state.isRunning && !this.store.state.pendingTick) {\n      this.#tick()\n    }\n\n    return true\n  }\n\n  /**\n   * Removes and returns the next item from the queue without executing the task function.\n   * Use for manual queue management. Normally, use execute() to process items.\n   *\n   * @example\n   * ```ts\n   * // FIFO\n   * queuer.getNextItem();\n   * // LIFO\n   * queuer.getNextItem('back');\n   * ```\n   */\n  getNextItem = (\n    position: QueuePosition = this.options.getItemsFrom ?? 'front',\n  ): TValue | undefined => {\n    const { items, itemTimestamps } = this.store.state\n    let item: TValue | undefined\n\n    if (position === 'front') {\n      item = items[0]\n      if (item !== undefined) {\n        this.#setState({\n          items: items.slice(1),\n          itemTimestamps: itemTimestamps.slice(1),\n        })\n      }\n    } else {\n      item = items[items.length - 1]\n      if (item !== undefined) {\n        this.#setState({\n          items: items.slice(0, -1),\n          itemTimestamps: itemTimestamps.slice(0, -1),\n        })\n      }\n    }\n\n    if (item !== undefined) {\n      this.options.onItemsChange?.(this)\n    }\n\n    return item\n  }\n\n  /**\n   * Removes and returns the next item from the queue and executes the task function with it.\n   *\n   * @example\n   * ```ts\n   * queuer.execute();\n   * // LIFO\n   * queuer.execute('back');\n   * ```\n   */\n  execute = async (position?: QueuePosition): Promise<any> => {\n    const item = this.getNextItem(position)\n    if (item !== undefined) {\n      try {\n        const lastResult = await this.fn(item)\n        this.#setState({\n          successCount: this.store.state.successCount + 1,\n          lastResult,\n        })\n        this.options.onSuccess?.(lastResult, this)\n      } catch (error) {\n        this.#setState({\n          errorCount: this.store.state.errorCount + 1,\n        })\n        this.options.onError?.(error, this)\n        if (this.options.throwOnError) {\n          throw error\n        }\n      } finally {\n        this.#setState({\n          activeItems: this.store.state.activeItems.filter(\n            (activeItem) => activeItem !== item,\n          ),\n          settledCount: this.store.state.settledCount + 1,\n        })\n        this.options.onSettled?.(this)\n      }\n    }\n    return item\n  }\n\n  /**\n   * Processes a specified number of items to execute immediately with no wait time\n   * If no numberOfItems is provided, all items will be processed\n   */\n  flush = (\n    numberOfItems: number = this.store.state.items.length,\n    position?: QueuePosition,\n  ): void => {\n    this.#clearTimeouts() // clear any pending timeouts\n    for (let i = 0; i < numberOfItems; i++) {\n      this.execute(position)\n    }\n  }\n\n  /**\n   * Checks for expired items in the queue and removes them. Calls onExpire for each expired item.\n   * Internal use only.\n   */\n  #checkExpiredItems = (): void => {\n    if (\n      (this.options.expirationDuration ?? Infinity) === Infinity &&\n      this.options.getIsExpired === defaultOptions.getIsExpired\n    ) {\n      return\n    }\n\n    const now = Date.now()\n    const expiredIndices: Array<number> = []\n\n    // Find indices of expired items\n    for (let i = 0; i < this.store.state.items.length; i++) {\n      const timestamp = this.store.state.itemTimestamps[i]\n      if (timestamp === undefined) continue\n\n      const item = this.store.state.items[i]\n      if (item === undefined) continue\n\n      const isExpired =\n        this.options.getIsExpired !== defaultOptions.getIsExpired\n          ? this.options.getIsExpired!(item, timestamp)\n          : now - timestamp > (this.options.expirationDuration ?? Infinity)\n\n      if (isExpired) {\n        expiredIndices.push(i)\n      }\n    }\n\n    // Remove expired items from back to front to maintain indices\n    for (let i = expiredIndices.length - 1; i >= 0; i--) {\n      const index = expiredIndices[i]\n      if (index === undefined) continue\n\n      const expiredItem = this.store.state.items[index]\n      if (expiredItem === undefined) continue\n\n      const newItems = [...this.store.state.items]\n      const newTimestamps = [...this.store.state.itemTimestamps]\n      newItems.splice(index, 1)\n      newTimestamps.splice(index, 1)\n      this.#setState({\n        items: newItems,\n        itemTimestamps: newTimestamps,\n        expirationCount: this.store.state.expirationCount + 1,\n      })\n      this.options.onExpire?.(expiredItem, this)\n    }\n\n    if (expiredIndices.length > 0) {\n      this.options.onItemsChange?.(this)\n    }\n  }\n\n  /**\n   * Returns the next item in the queue without removing it.\n   *\n   * @example\n   * ```ts\n   * queuer.peekNextItem(); // front\n   * queuer.peekNextItem('back'); // back\n   * ```\n   */\n  peekNextItem = (position: QueuePosition = 'front'): TValue | undefined => {\n    if (position === 'front') {\n      return this.store.state.items[0]\n    }\n    return this.store.state.items[this.store.state.items.length - 1]\n  }\n\n  /**\n   * Returns a copy of all items in the queue, including active and pending items.\n   */\n  peekAllItems = (): Array<TValue> => {\n    return [...this.peekActiveItems(), ...this.peekPendingItems()]\n  }\n\n  /**\n   * Returns the items currently being processed (active tasks).\n   */\n  peekActiveItems = (): Array<TValue> => {\n    return [...this.store.state.activeItems]\n  }\n\n  /**\n   * Returns the items waiting to be processed (pending tasks).\n   */\n  peekPendingItems = (): Array<TValue> => {\n    return [...this.store.state.items]\n  }\n\n  /**\n   * Starts processing items in the queue. If already running, does nothing.\n   */\n  start = (): void => {\n    this.#setState({ isRunning: true })\n    if (!this.store.state.pendingTick && this.store.state.items.length > 0) {\n      this.#tick()\n    }\n  }\n\n  /**\n   * Stops processing items in the queue. Does not clear the queue.\n   */\n  stop = (): void => {\n    this.#clearTimeouts()\n    this.#setState({ isRunning: false, pendingTick: false })\n  }\n\n  #clearTimeouts = (): void => {\n    this.#timeoutIds.forEach((timeoutId) => clearTimeout(timeoutId))\n    this.#timeoutIds.clear()\n  }\n\n  /**\n   * Removes all pending items from the queue. Does not affect active tasks.\n   */\n  clear = (): void => {\n    this.#setState({ items: [], itemTimestamps: [] })\n    this.options.onItemsChange?.(this)\n  }\n\n  /**\n   * Resets the queuer state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultAsyncQueuerState<TValue>())\n    this.options.onItemsChange?.(this)\n  }\n}\n\n/**\n * Creates a new AsyncQueuer instance and returns a bound addItem function for adding tasks.\n * The queuer is started automatically and ready to process items.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and queuer instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together; the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncQueuer instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async queuer\n * - Use `onSuccess` callback to react to successful task execution and implement custom logic\n * - Use `onError` callback to react to task execution errors and implement custom error handling\n * - Use `onSettled` callback to react to task execution completion (success or error) and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the queue\n * - Use `onExpire` callback to react to items expiring and implement custom logic\n * - Use `onReject` callback to react to items being rejected when the queue is full\n * - The state includes error count, expiration count, rejection count, running status, and success/settle counts\n * - State can be accessed via the underlying AsyncQueuer instance's `store.state` property\n 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Priority queue support via the getPriority option\n * - Configurable concurrency limit\n * - Callbacks for task success, error, completion, and queue state changes\n * - FIFO (First In First Out) or LIFO (Last In First Out) queue behavior\n * - Pause and resume processing\n * - Task cancellation\n * - Item expiration to remove stale items from the queue\n *\n * Tasks are processed concurrently up to the configured concurrency limit. When a task completes,\n * the next pending task is processed if the concurrency limit allows.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and queuer instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together; the handler will be called before any error is thrown\n * - The error state can be checked using the AsyncQueuer instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async queuer\n * - Use `onSuccess` callback to react to successful task execution and implement custom logic\n * - Use `onError` callback to react to task execution errors and implement custom error handling\n * - Use `onSettled` callback to react to task execution completion (success or error) and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the queue\n * - Use `onExpire` callback to react to items expiring and implement custom logic\n * - Use `onReject` callback to react to items being rejected when the queue is full\n * - The state includes error count, expiration count, rejection count, running status, and success/settle counts\n * - State can be accessed via `asyncQueuer.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `asyncQueuer.state`\n *\n * Example usage:\n * ```ts\n * const asyncQueuer = new AsyncQueuer<string>(async (item) => {\n *   // process item\n *   return item.toUpperCase();\n * }, {\n *   concurrency: 2,\n *   onSuccess: (result) => {\n *     console.log(result);\n *   }\n * });\n *\n * asyncQueuer.addItem('hello');\n * asyncQueuer.start();\n * ```\n */\nexport class AsyncQueuer<TValue> {\n  readonly store: Store<Readonly<AsyncQueuerState<TValue>>> = new Store<\n    AsyncQueuerState<TValue>\n  >(getDefaultAsyncQueuerState<TValue>())\n  options: AsyncQueuerOptions<TValue>\n  #timeoutIds: Set<NodeJS.Timeout> = new Set()\n\n  constructor(\n    private fn: (item: TValue) => Promise<any>,\n    initialOptions: AsyncQueuerOptions<TValue> = {},\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n      throwOnError: initialOptions.throwOnError ?? !initialOptions.onError,\n    }\n    const isInitiallyRunning =\n      this.options.initialState?.isRunning ?? this.options.started ?? true\n    this.#setState({\n      ...this.options.initialState,\n      isRunning: isInitiallyRunning,\n    })\n\n    if (this.options.initialState?.items) {\n      if (this.store.state.isRunning) {\n        this.#tick()\n      }\n    } else {\n      for (let i = 0; i < (this.options.initialItems?.length ?? 0); i++) {\n        const item = this.options.initialItems![i]!\n        const isLast = i === (this.options.initialItems?.length ?? 0) - 1\n        this.addItem(item, this.options.addItemsTo ?? 'back', isLast)\n      }\n    }\n  }\n\n  /**\n   * Updates the queuer options. New options are merged with existing options.\n   */\n  setOptions = (newOptions: Partial<AsyncQueuerOptions<TValue>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<AsyncQueuerState<TValue>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n\n      const { activeItems, items, isRunning } = combinedState\n\n      const size = items.length\n      const isFull = size >= (this.options.maxSize ?? Infinity)\n      const isEmpty = size === 0\n      const isIdle = isRunning && isEmpty && activeItems.length === 0\n\n      const status = isIdle ? 'idle' : isRunning ? 'running' : 'stopped'\n\n      return {\n        ...combinedState,\n        isEmpty,\n        isFull,\n        isIdle,\n        size,\n        status,\n      }\n    })\n  }\n\n  /**\n   * Returns the current wait time (in milliseconds) between processing items.\n   * If a function is provided, it is called with the queuer instance.\n   */\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait ?? 0, this)\n  }\n\n  /**\n   * Returns the current concurrency limit for processing items.\n   * If a function is provided, it is called with the queuer instance.\n   */\n  #getConcurrency = (): number => {\n    return parseFunctionOrValue(this.options.concurrency ?? 1, this)\n  }\n\n  /**\n   * Processes items in the queue up to the concurrency limit. Internal use only.\n   */\n  #tick = () => {\n    if (!this.store.state.isRunning) {\n      this.#setState({ pendingTick: false })\n      return\n    }\n    this.#setState({ pendingTick: true })\n\n    // Check for expired items\n    this.#checkExpiredItems()\n\n    // Process items concurrently up to the concurrency limit\n    const activeItems = this.store.state.activeItems\n    while (\n      activeItems.length < this.#getConcurrency() &&\n      this.store.state.items.length > 0\n    ) {\n      const nextItem = this.peekNextItem()\n      if (!nextItem) {\n        break\n      }\n      activeItems.push(nextItem)\n      this.#setState({\n        activeItems,\n      })\n      ;(async () => {\n        const result = await this.execute()\n        this.#setState({ lastResult: result })\n\n        const wait = this.#getWait()\n        if (wait > 0) {\n          const timeoutId = setTimeout(() => this.#tick(), wait)\n          this.#timeoutIds.add(timeoutId)\n          return\n        }\n\n        this.#tick()\n      })()\n    }\n\n    this.#setState({ pendingTick: false })\n  }\n\n  /**\n   * Adds an item to the queue. If the queue is full, the item is rejected and onReject is called.\n   * Items can be inserted based on priority or at the front/back depending on configuration.\n   *\n   * @example\n   * ```ts\n   * queuer.addItem({ value: 'task', priority: 10 });\n   * queuer.addItem('task2', 'front');\n   * ```\n   */\n  addItem = (\n    item: TValue,\n    position: QueuePosition = this.options.addItemsTo ?? 'back',\n    runOnItemsChange: boolean = true,\n  ): boolean => {\n    if (this.store.state.items.length >= (this.options.maxSize ?? Infinity)) {\n      this.#setState({\n        rejectionCount: this.store.state.rejectionCount + 1,\n      })\n      this.options.onReject?.(item, this)\n      return false\n    }\n\n    // Get priority either from the function or from getPriority option\n    const priority =\n      this.options.getPriority !== defaultOptions.getPriority\n        ? this.options.getPriority!(item)\n        : (item as any).priority\n\n    const items = this.store.state.items\n    const itemTimestamps = this.store.state.itemTimestamps\n\n    if (priority !== undefined) {\n      // Insert based on priority - higher priority items go to front\n      const insertIndex = items.findIndex((existing) => {\n        const existingPriority =\n          this.options.getPriority !== defaultOptions.getPriority\n            ? this.options.getPriority!(existing)\n            : (existing as any).priority\n        return existingPriority < priority\n      })\n\n      if (insertIndex === -1) {\n        items.push(item)\n        itemTimestamps.push(Date.now())\n      } else {\n        items.splice(insertIndex, 0, item)\n        itemTimestamps.splice(insertIndex, 0, Date.now())\n      }\n    } else {\n      if (position === 'front') {\n        // Default FIFO/LIFO behavior\n        items.unshift(item)\n        itemTimestamps.unshift(Date.now())\n      } else {\n        // LIFO\n        items.push(item)\n        itemTimestamps.push(Date.now())\n      }\n    }\n\n    this.#setState({\n      items,\n      itemTimestamps,\n    })\n\n    if (runOnItemsChange) {\n      this.options.onItemsChange?.(this)\n    }\n\n    if (this.store.state.isRunning && !this.store.state.pendingTick) {\n      this.#tick()\n    }\n\n    return true\n  }\n\n  /**\n   * Removes and returns the next item from the queue without executing the task function.\n   * Use for manual queue management. Normally, use execute() to process items.\n   *\n   * @example\n   * ```ts\n   * // FIFO\n   * queuer.getNextItem();\n   * // LIFO\n   * queuer.getNextItem('back');\n   * ```\n   */\n  getNextItem = (\n    position: QueuePosition = this.options.getItemsFrom ?? 'front',\n  ): TValue | undefined => {\n    const { items, itemTimestamps } = this.store.state\n    let item: TValue | undefined\n\n    if (position === 'front') {\n      item = items[0]\n      if (item !== undefined) {\n        this.#setState({\n          items: items.slice(1),\n          itemTimestamps: itemTimestamps.slice(1),\n        })\n      }\n    } else {\n      item = items[items.length - 1]\n      if (item !== undefined) {\n        this.#setState({\n          items: items.slice(0, -1),\n          itemTimestamps: itemTimestamps.slice(0, -1),\n        })\n      }\n    }\n\n    if (item !== undefined) {\n      this.options.onItemsChange?.(this)\n    }\n\n    return item\n  }\n\n  #getAllItems = (): Array<TValue> => {\n    const items = this.peekAllItems()\n    this.clear()\n    return items\n  }\n\n  /**\n   * Removes and returns the next item from the queue and executes the task function with it.\n   *\n   * @example\n   * ```ts\n   * queuer.execute();\n   * // LIFO\n   * queuer.execute('back');\n   * ```\n   */\n  execute = async (position?: QueuePosition): Promise<any> => {\n    const item = this.getNextItem(position)\n    if (item !== undefined) {\n      try {\n        const lastResult = await this.fn(item)\n        this.#setState({\n          successCount: this.store.state.successCount + 1,\n          lastResult,\n        })\n        this.options.onSuccess?.(lastResult, this)\n      } catch (error) {\n        this.#setState({\n          errorCount: this.store.state.errorCount + 1,\n        })\n        this.options.onError?.(error, this)\n        if (this.options.throwOnError) {\n          throw error\n        }\n      } finally {\n        this.#setState({\n          activeItems: this.store.state.activeItems.filter(\n            (activeItem) => activeItem !== item,\n          ),\n          settledCount: this.store.state.settledCount + 1,\n        })\n        this.options.onSettled?.(this)\n      }\n    }\n    return item\n  }\n\n  /**\n   * Processes a specified number of items to execute immediately with no wait time\n   * If no numberOfItems is provided, all items will be processed\n   */\n  flush = async (\n    numberOfItems: number = this.store.state.items.length,\n    position?: QueuePosition,\n  ): Promise<void> => {\n    this.#clearTimeouts() // clear any pending timeouts\n    await Promise.all(\n      Array.from({ length: numberOfItems }, () => this.execute(position)),\n    )\n  }\n\n  /**\n   * Processes all items in the queue as a batch using the provided function\n   * The queue is cleared after processing\n   */\n  flushAsBatch = async (\n    batchFunction: (items: Array<TValue>) => Promise<any>,\n  ): Promise<void> => {\n    this.#clearTimeouts() // clear any pending timeouts\n    const items = this.#getAllItems()\n    await batchFunction(items)\n  }\n\n  /**\n   * Checks for expired items in the queue and removes them. Calls onExpire for each expired item.\n   * Internal use only.\n   */\n  #checkExpiredItems = (): void => {\n    if (\n      (this.options.expirationDuration ?? Infinity) === Infinity &&\n      this.options.getIsExpired === defaultOptions.getIsExpired\n    ) {\n      return\n    }\n\n    const now = Date.now()\n    const expiredIndices: Array<number> = []\n\n    // Find indices of expired items\n    for (let i = 0; i < this.store.state.items.length; i++) {\n      const timestamp = this.store.state.itemTimestamps[i]\n      if (timestamp === undefined) continue\n\n      const item = this.store.state.items[i]\n      if (item === undefined) continue\n\n      const isExpired =\n        this.options.getIsExpired !== defaultOptions.getIsExpired\n          ? this.options.getIsExpired!(item, timestamp)\n          : now - timestamp > (this.options.expirationDuration ?? Infinity)\n\n      if (isExpired) {\n        expiredIndices.push(i)\n      }\n    }\n\n    // Remove expired items from back to front to maintain indices\n    for (let i = expiredIndices.length - 1; i >= 0; i--) {\n      const index = expiredIndices[i]\n      if (index === undefined) continue\n\n      const expiredItem = this.store.state.items[index]\n      if (expiredItem === undefined) continue\n\n      const newItems = [...this.store.state.items]\n      const newTimestamps = [...this.store.state.itemTimestamps]\n      newItems.splice(index, 1)\n      newTimestamps.splice(index, 1)\n      this.#setState({\n        items: newItems,\n        itemTimestamps: newTimestamps,\n        expirationCount: this.store.state.expirationCount + 1,\n      })\n      this.options.onExpire?.(expiredItem, this)\n    }\n\n    if (expiredIndices.length > 0) {\n      this.options.onItemsChange?.(this)\n    }\n  }\n\n  /**\n   * Returns the next item in the queue without removing it.\n   *\n   * @example\n   * ```ts\n   * queuer.peekNextItem(); // front\n   * queuer.peekNextItem('back'); // back\n   * ```\n   */\n  peekNextItem = (position: QueuePosition = 'front'): TValue | undefined => {\n    if (position === 'front') {\n      return this.store.state.items[0]\n    }\n    return this.store.state.items[this.store.state.items.length - 1]\n  }\n\n  /**\n   * Returns a copy of all items in the queue, including active and pending items.\n   */\n  peekAllItems = (): Array<TValue> => {\n    return [...this.peekActiveItems(), ...this.peekPendingItems()]\n  }\n\n  /**\n   * Returns the items currently being processed (active tasks).\n   */\n  peekActiveItems = (): Array<TValue> => {\n    return [...this.store.state.activeItems]\n  }\n\n  /**\n   * Returns the items waiting to be processed (pending tasks).\n   */\n  peekPendingItems = (): Array<TValue> => {\n    return [...this.store.state.items]\n  }\n\n  /**\n   * Starts processing items in the queue. If already running, does nothing.\n   */\n  start = (): void => {\n    this.#setState({ isRunning: true })\n    if (!this.store.state.pendingTick && this.store.state.items.length > 0) {\n      this.#tick()\n    }\n  }\n\n  /**\n   * Stops processing items in the queue. Does not clear the queue.\n   */\n  stop = (): void => {\n    this.#clearTimeouts()\n    this.#setState({ isRunning: false, pendingTick: false })\n  }\n\n  #clearTimeouts = (): void => {\n    this.#timeoutIds.forEach((timeoutId) => clearTimeout(timeoutId))\n    this.#timeoutIds.clear()\n  }\n\n  /**\n   * Removes all pending items from the queue. Does not affect active tasks.\n   */\n  clear = (): void => {\n    this.#setState({ items: [], itemTimestamps: [] })\n    this.options.onItemsChange?.(this)\n  }\n\n  /**\n   * Resets the queuer state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultAsyncQueuerState<TValue>())\n    this.options.onItemsChange?.(this)\n  }\n}\n\n/**\n * Creates a new AsyncQueuer instance and returns a bound addItem function for adding tasks.\n * The queuer is started automatically and ready to process items.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and queuer instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together; the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncQueuer instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async queuer\n * - Use `onSuccess` callback to react to successful task execution and implement custom logic\n * - Use `onError` callback to react to task execution errors and implement custom error handling\n * - Use `onSettled` callback to react to task execution completion (success or error) and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the queue\n * - Use `onExpire` callback to react to items expiring and implement custom logic\n * - Use `onReject` callback to react to items being rejected when the queue is full\n * - The state includes error count, expiration count, rejection count, running status, and success/settle counts\n * - State can be accessed via the underlying AsyncQueuer instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * Example usage:\n * ```ts\n * const enqueue = asyncQueue<string>(async (item) => {\n *   return item.toUpperCase();\n * }, {...options});\n *\n * enqueue('hello');\n * ```\n */\nexport function asyncQueue<TValue>(\n  fn: (value: TValue) => Promise<any>,\n  initialOptions: AsyncQueuerOptions<TValue>,\n) {\n  const asyncQueuer = new AsyncQueuer<TValue>(fn, initialOptions)\n  return 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dist/cjs/async-queuer.d.cts

@@ -33,2 +33,6 @@ import { Store } from '@tanstack/store';
     /**
+     * Array of items currently waiting to be processed
+     */
+    items: Array<TValue>;
+    /**
      * Timestamps when items were added to the queue for expiration tracking
@@ -38,6 +42,2 @@ */
     /**
-     * Array of items currently waiting to be processed
-     */
-    items: Array<TValue>;
-    /**
      * The result from the most recent task execution
@@ -259,4 +259,9 @@ */
      */
-    flush: (numberOfItems?: number, position?: QueuePosition) => void;
+    flush: (numberOfItems?: number, position?: QueuePosition) => Promise<void>;
     /**
+     * Processes all items in the queue as a batch using the provided function
+     * The queue is cleared after processing
+     */
+    flushAsBatch: (batchFunction: (items: Array<TValue>) => Promise<any>) => Promise<void>;
+    /**
      * Returns the next item in the queue without removing it.
@@ -263,0 +268,0 @@ *

dist/cjs/async-rate-limiter.cjs

@@ -9,2 +9,3 @@ "use strict";
     executionTimes: [],
+    isExceeded: false,
     isExecuting: false,
@@ -14,3 +15,4 @@ lastResult: void 0,
     settleCount: 0,
-    successCount: 0
+    successCount: 0,
+    status: "idle"
   };
@@ -29,2 +31,3 @@ }
     this.store = new store.Store(getDefaultAsyncRateLimiterState());
+    this.#timeoutIds = /* @__PURE__ */ new Set();
     this.setOptions = (newOptions) => {
@@ -39,3 +42,9 @@ this.options = { ...this.options, ...newOptions };
         };
-        return combinedState;
+        const isExceeded = combinedState.executionTimes.length >= this.#getLimit();
+        const status = !this.#getEnabled() ? "disabled" : combinedState.isExecuting ? "executing" : isExceeded ? "exceeded" : "idle";
+        return {
+          ...combinedState,
+          isExceeded,
+          status
+        };
       });
@@ -54,3 +63,3 @@ };
       this.#cleanupOldExecutions();
-      const relevantExecutionTimes = this.#getRelevantExecutionTimes();
+      const relevantExecutionTimes = this.#getExecutionTimesInWindow();
       if (relevantExecutionTimes.length < this.#getLimit()) {
@@ -76,2 +85,3 @@ await this.#execute(...args);
         const result = await this.fn(...args);
+        this.#setCleanupTimeout(now);
         this.#setState({
@@ -99,3 +109,3 @@ successCount: this.store.state.successCount + 1,
     };
-    this.#getRelevantExecutionTimes = () => {
+    this.#getExecutionTimesInWindow = () => {
       if (this.options.windowType === "sliding") {
@@ -106,20 +116,43 @@ return this.store.state.executionTimes.filter(
       } else {
+        if (this.store.state.executionTimes.length === 0) {
+          return [];
+        }
         const oldestExecution = Math.min(...this.store.state.executionTimes);
         const windowStart = oldestExecution;
+        const windowEnd = windowStart + this.#getWindow();
+        const now = Date.now();
+        if (now > windowEnd) {
+          return [];
+        }
         return this.store.state.executionTimes.filter(
-          (time) => time >= windowStart && time <= windowStart + this.#getWindow()
+          (time) => time >= windowStart && time <= windowEnd
         );
       }
     };
+    this.#setCleanupTimeout = (executionTime) => {
+      if (this.options.windowType === "sliding" || this.#timeoutIds.size === 0) {
+        const now = Date.now();
+        const timeUntilExpiration = executionTime - now + this.#getWindow() + 1;
+        const timeoutId = setTimeout(() => {
+          this.#cleanupOldExecutions();
+          this.#clearTimeout(timeoutId);
+        }, timeUntilExpiration);
+        this.#timeoutIds.add(timeoutId);
+      }
+    };
+    this.#clearTimeout = (timeoutId) => {
+      clearTimeout(timeoutId);
+      this.#timeoutIds.delete(timeoutId);
+    };
+    this.#clearTimeouts = () => {
+      this.#timeoutIds.forEach((timeoutId) => clearTimeout(timeoutId));
+      this.#timeoutIds.clear();
+    };
     this.#cleanupOldExecutions = () => {
-      const now = Date.now();
-      const windowStart = now - this.#getWindow();
       this.#setState({
-        executionTimes: this.store.state.executionTimes.filter(
-          (time) => time > windowStart
-        )
+        executionTimes: this.#getExecutionTimesInWindow()
       });
     };
     this.getRemainingInWindow = () => {
-      const relevantExecutionTimes = this.#getRelevantExecutionTimes();
+      const relevantExecutionTimes = this.#getExecutionTimesInWindow();
       return Math.max(0, this.#getLimit() - relevantExecutionTimes.length);
@@ -136,2 +169,3 @@ };
       this.#setState(getDefaultAsyncRateLimiterState());
+      this.#clearTimeouts();
     };
@@ -144,3 +178,7 @@ this.options = {
     this.#setState(this.options.initialState ?? {});
+    for (const executionTime of this.#getExecutionTimesInWindow()) {
+      this.#setCleanupTimeout(executionTime);
+    }
   }
+  #timeoutIds;
   #setState;
@@ -151,3 +189,6 @@ #getEnabled;
   #execute;
-  #getRelevantExecutionTimes;
+  #getExecutionTimesInWindow;
+  #setCleanupTimeout;
+  #clearTimeout;
+  #clearTimeouts;
   #cleanupOldExecutions;
@@ -154,0 +195,0 @@ }

dist/cjs/async-rate-limiter.cjs.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"async-rate-limiter.cjs","sources":["../../src/async-rate-limiter.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { AnyAsyncFunction } from './types'\n\nexport interface AsyncRateLimiterState<TFn extends AnyAsyncFunction> {\n  /**\n   * Number of function executions that have resulted in errors\n   */\n  errorCount: number\n  /**\n   * Array of timestamps when executions occurred for rate limiting calculations\n   */\n  executionTimes: Array<number>\n  /**\n   * Whether the rate-limited function is currently executing asynchronously\n   */\n  isExecuting: boolean\n  /**\n   * The result from the most recent successful function execution\n   */\n  lastResult: ReturnType<TFn> | undefined\n  /**\n   * Number of function executions that have been rejected due to rate limiting\n   */\n  rejectionCount: number\n  /**\n   * Number of function executions that have completed (either successfully or with errors)\n   */\n  settleCount: number\n  /**\n   * Number of function executions that have completed successfully\n   */\n  successCount: number\n}\n\nfunction getDefaultAsyncRateLimiterState<\n  TFn extends AnyAsyncFunction,\n>(): AsyncRateLimiterState<TFn> {\n  return {\n    errorCount: 0,\n    executionTimes: [],\n    isExecuting: false,\n    lastResult: undefined,\n    rejectionCount: 0,\n    settleCount: 0,\n    successCount: 0,\n  }\n}\n\n/**\n * Options for configuring an async rate-limited function\n */\nexport interface AsyncRateLimiterOptions<TFn extends AnyAsyncFunction> {\n  /**\n   * Whether the rate limiter is enabled. When disabled, maybeExecute will not trigger any executions.\n   * Can be a boolean or a function that returns a boolean.\n   * Defaults to true.\n   */\n  enabled?: boolean | ((rateLimiter: AsyncRateLimiter<TFn>) => boolean)\n  /**\n   * Initial state for the rate limiter\n   */\n  initialState?: Partial<AsyncRateLimiterState<TFn>>\n  /**\n   * Maximum number of executions allowed within the time window.\n   * Can be a number or a function that returns a number.\n   */\n  limit: number | ((rateLimiter: AsyncRateLimiter<TFn>) => number)\n  /**\n   * Optional error handler for when the rate-limited function throws.\n   * If provided, the handler will be called with the error and rate limiter instance.\n   * This can be used alongside throwOnError - the handler will be called before any error is thrown.\n   */\n  onError?: (error: unknown, rateLimiter: AsyncRateLimiter<TFn>) => void\n  /**\n   * Optional callback function that is called when an execution is rejected due to rate limiting\n   */\n  onReject?: (rateLimiter: AsyncRateLimiter<TFn>) => void\n  /**\n   * Optional function to call when the rate-limited function is executed\n   */\n  onSettled?: (rateLimiter: AsyncRateLimiter<TFn>) => void\n  /**\n   * Optional function to call when the rate-limited function is executed\n   */\n  onSuccess?: (\n    result: ReturnType<TFn>,\n    rateLimiter: AsyncRateLimiter<TFn>,\n  ) => void\n  /**\n   * Whether to throw errors when they occur.\n   * Defaults to true if no onError handler is provided, false if an onError handler is provided.\n   * Can be explicitly set to override these defaults.\n   */\n  throwOnError?: boolean\n  /**\n   * Time window in milliseconds within which the limit applies.\n   * Can be a number or a function that returns a number.\n   */\n  window: number | ((rateLimiter: AsyncRateLimiter<TFn>) => number)\n  /**\n   * Type of window to use for rate limiting\n   * - 'fixed': Uses a fixed window that resets after the window period\n   * - 'sliding': Uses a sliding window that allows executions as old ones expire\n   * Defaults to 'fixed'\n   */\n  windowType?: 'fixed' | 'sliding'\n}\n\nconst defaultOptions: Omit<\n  Required<AsyncRateLimiterOptions<any>>,\n  'initialState' | 'onError' | 'onReject' | 'onSettled' | 'onSuccess'\n> = {\n  enabled: true,\n  limit: 1,\n  window: 0,\n  windowType: 'fixed',\n  throwOnError: true,\n}\n\n/**\n * A class that creates an async rate-limited function.\n *\n * Rate limiting is a simple approach that allows a function to execute up to a limit within a time window,\n * then blocks all subsequent calls until the window passes. This can lead to \"bursty\" behavior where\n * all executions happen immediately, followed by a complete block.\n *\n * The rate limiter supports two types of windows:\n * - 'fixed': A strict window that resets after the window period. All executions within the window count\n *   towards the limit, and the window resets completely after the period.\n * - 'sliding': A rolling window that allows executions as old ones expire. This provides a more\n *   consistent rate of execution over time.\n *\n * Unlike the non-async RateLimiter, this async version supports returning values from the rate-limited function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the rate-limited function.\n *\n * For smoother execution patterns, consider using:\n * - Throttling: Ensures consistent spacing between executions (e.g. max once per 200ms)\n * - Debouncing: Waits for a pause in calls before executing (e.g. after 500ms of no calls)\n *\n * Rate limiting is best used for hard API limits or resource constraints. For UI updates or\n * smoothing out frequent events, throttling or debouncing usually provide better user experience.\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the rate limiter\n * - `initialState` can be a partial state object\n * - Use `onSuccess` callback to react to successful function execution and implement custom logic\n * - Use `onError` callback to react to function execution errors and implement custom error handling\n * - Use `onSettled` callback to react to function execution completion (success or error) and implement custom logic\n * - Use `onReject` callback to react to executions being rejected when rate limit is exceeded\n * - The state includes execution times, success/error counts, and current execution status\n * - State can be accessed via `asyncRateLimiter.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `asyncRateLimiter.state`\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and rate limiter instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncRateLimiter instance\n * - Rate limit rejections (when limit is exceeded) are handled separately from execution errors via the `onReject` handler\n *\n * @example\n * ```ts\n * const rateLimiter = new AsyncRateLimiter(\n *   async (id: string) => await api.getData(id),\n *   {\n *     limit: 5,\n *     window: 1000,\n *     windowType: 'sliding',\n *     onError: (error) => {\n *       console.error('API call failed:', error);\n *     },\n *     onReject: (limiter) => {\n *       console.log(`Rate limit exceeded. Try again in ${limiter.getMsUntilNextWindow()}ms`);\n *     }\n *   }\n * );\n *\n * // Will execute immediately until limit reached, then block\n * // Returns the API response directly\n * const data = await rateLimiter.maybeExecute('123');\n * ```\n */\nexport class AsyncRateLimiter<TFn extends AnyAsyncFunction> {\n  readonly store: Store<Readonly<AsyncRateLimiterState<TFn>>> = new Store<\n    AsyncRateLimiterState<TFn>\n  >(getDefaultAsyncRateLimiterState<TFn>())\n  options: AsyncRateLimiterOptions<TFn>\n\n  constructor(\n    private fn: TFn,\n    initialOptions: AsyncRateLimiterOptions<TFn>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n      throwOnError: initialOptions.throwOnError ?? !initialOptions.onError,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the async rate limiter options\n   */\n  setOptions = (newOptions: Partial<AsyncRateLimiterOptions<TFn>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<AsyncRateLimiterState<TFn>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      return combinedState\n    })\n  }\n\n  /**\n   * Returns the current enabled state of the async rate limiter\n   */\n  #getEnabled = (): boolean => {\n    return !!parseFunctionOrValue(this.options.enabled, this)\n  }\n\n  /**\n   * Returns the current limit of executions allowed within the time window\n   */\n  #getLimit = (): number => {\n    return parseFunctionOrValue(this.options.limit, this)\n  }\n\n  /**\n   * Returns the current time window in milliseconds\n   */\n  #getWindow = (): number => {\n    return parseFunctionOrValue(this.options.window, this)\n  }\n\n  /**\n   * Attempts to execute the rate-limited function if within the configured limits.\n   * Will reject execution if the number of calls in the current window exceeds the limit.\n   *\n   * Error Handling:\n   * - If the rate-limited function throws and no `onError` handler is configured,\n   *   the error will be thrown from this method.\n   * - If an `onError` handler is configured, errors will be caught and passed to the handler,\n   *   and this method will return undefined.\n   * - The error state can be checked using `getErrorCount()` and `getIsExecuting()`.\n   *\n   * @returns A promise that resolves with the function's return value, or undefined if an error occurred and was handled by onError\n   * @throws The error from the rate-limited function if no onError handler is configured\n   *\n   * @example\n   * ```ts\n   * const rateLimiter = new AsyncRateLimiter(fn, { limit: 5, window: 1000 });\n   *\n   * // First 5 calls will return a promise that resolves with the result\n   * const result = await rateLimiter.maybeExecute('arg1', 'arg2');\n   *\n   * // Additional calls within the window will return undefined\n   * const result2 = await rateLimiter.maybeExecute('arg1', 'arg2'); // undefined\n   * ```\n   */\n  maybeExecute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    this.#cleanupOldExecutions()\n\n    const relevantExecutionTimes = this.#getRelevantExecutionTimes()\n\n    if (relevantExecutionTimes.length < this.#getLimit()) {\n      await this.#execute(...args)\n      return this.store.state.lastResult\n    }\n\n    this.#setState({\n      rejectionCount: this.store.state.rejectionCount + 1,\n    })\n    this.options.onReject?.(this)\n    return undefined\n  }\n\n  #execute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    if (!this.#getEnabled()) return\n\n    const now = Date.now()\n    const executionTimes = [...this.store.state.executionTimes, now]\n    this.#setState({\n      isExecuting: true,\n      executionTimes,\n    })\n\n    try {\n      const result = await this.fn(...args)\n      this.#setState({\n        successCount: this.store.state.successCount + 1,\n        lastResult: result,\n      })\n      this.options.onSuccess?.(result, this)\n    } catch (error) {\n      this.#setState({\n        errorCount: this.store.state.errorCount + 1,\n      })\n      this.options.onError?.(error, this)\n      if (this.options.throwOnError) {\n        throw error\n      }\n    } finally {\n      this.#setState({\n        isExecuting: false,\n        settleCount: this.store.state.settleCount + 1,\n      })\n      this.options.onSettled?.(this)\n    }\n\n    return this.store.state.lastResult\n  }\n\n  #getRelevantExecutionTimes = (): Array<number> => {\n    if (this.options.windowType === 'sliding') {\n      // For sliding window, return all executions within the current window\n      return this.store.state.executionTimes.filter(\n        (time) => time > Date.now() - this.#getWindow(),\n      )\n    } else {\n      // For fixed window, return all executions in the current window\n      // The window starts from the oldest execution time\n      const oldestExecution = Math.min(...this.store.state.executionTimes)\n      const windowStart = oldestExecution\n      return this.store.state.executionTimes.filter(\n        (time) =>\n          time >= windowStart && time <= windowStart + this.#getWindow(),\n      )\n    }\n  }\n\n  #cleanupOldExecutions = (): void => {\n    const now = Date.now()\n    const windowStart = now - this.#getWindow()\n    this.#setState({\n      executionTimes: this.store.state.executionTimes.filter(\n        (time) => time > windowStart,\n      ),\n    })\n  }\n\n  /**\n   * Returns the number of remaining executions allowed in the current window\n   */\n  getRemainingInWindow = (): number => {\n    const relevantExecutionTimes = this.#getRelevantExecutionTimes()\n    return Math.max(0, this.#getLimit() - relevantExecutionTimes.length)\n  }\n\n  /**\n   * Returns the number of milliseconds until the next execution will be possible\n   * For fixed windows, this is the time until the current window resets\n   * For sliding windows, this is the time until the oldest execution expires\n   */\n  getMsUntilNextWindow = (): number => {\n    if (this.getRemainingInWindow() > 0) {\n      return 0\n    }\n    const oldestExecution = this.store.state.executionTimes[0] ?? Infinity\n    return oldestExecution + this.#getWindow() - Date.now()\n  }\n\n  /**\n   * Resets the rate limiter state\n   */\n  reset = (): void => {\n    this.#setState(getDefaultAsyncRateLimiterState())\n  }\n}\n\n/**\n * Creates an async rate-limited function that will execute the provided function up to a maximum number of times within a time window.\n *\n * Unlike the non-async rate limiter, this async version supports returning values from the rate-limited function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the rate-limited function.\n *\n * The rate limiter supports two types of windows:\n * - 'fixed': A strict window that resets after the window period. All executions within the window count\n *   towards the limit, and the window resets completely after the period.\n * - 'sliding': A rolling window that allows executions as old ones expire. This provides a more\n *   consistent rate of execution over time.\n *\n * Note that rate limiting is a simpler form of execution control compared to throttling or debouncing:\n * - A rate limiter will allow all executions until the limit is reached, then block all subsequent calls until the window resets\n * - A throttler ensures even spacing between executions, which can be better for consistent performance\n * - A debouncer collapses multiple calls into one, which is better for handling bursts of events\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the rate limiter\n * - `initialState` can be a partial state object\n * - Use `onSuccess` callback to react to successful function execution and implement custom logic\n * - Use `onError` callback to react to function execution errors and implement custom error handling\n * - Use `onSettled` callback to react to function execution completion (success or error) and implement custom logic\n * - Use `onReject` callback to react to executions being rejected when rate limit is exceeded\n * - The state includes execution times, success/error counts, and current execution status\n * - State can be accessed via the underlying AsyncRateLimiter instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * Consider using throttle() or debounce() if you need more intelligent execution control. Use rate limiting when you specifically\n * need to enforce a hard limit on the number of executions within a time period.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and rate limiter instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncRateLimiter instance\n * - Rate limit rejections (when limit is exceeded) are handled separately from execution errors via the `onReject` handler\n *\n * @example\n * ```ts\n * // Rate limit to 5 calls per minute with a sliding window\n * const rateLimited = asyncRateLimit(makeApiCall, {\n *   limit: 5,\n *   window: 60000,\n *   windowType: 'sliding',\n *   onError: (error) => {\n *     console.error('API call failed:', error);\n *   },\n *   onReject: (rateLimiter) => {\n *     console.log(`Rate limit exceeded. 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+{"version":3,"file":"async-rate-limiter.cjs","sources":["../../src/async-rate-limiter.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { AnyAsyncFunction } from './types'\n\nexport interface AsyncRateLimiterState<TFn extends AnyAsyncFunction> {\n  /**\n   * Number of function executions that have resulted in errors\n   */\n  errorCount: number\n  /**\n   * Array of timestamps when executions occurred for rate limiting calculations\n   */\n  executionTimes: Array<number>\n  /**\n   * Whether the rate limiter has exceeded the limit\n   */\n  isExceeded: boolean\n  /**\n   * Whether the rate-limited function is currently executing asynchronously\n   */\n  isExecuting: boolean\n  /**\n   * The result from the most recent successful function execution\n   */\n  lastResult: ReturnType<TFn> | undefined\n  /**\n   * Number of function executions that have been rejected due to rate limiting\n   */\n  rejectionCount: number\n  /**\n   * Number of function executions that have completed (either successfully or with errors)\n   */\n  settleCount: number\n  /**\n   * Current execution status - 'disabled' when not active, 'executing' when executing, 'idle' when not executing, 'exceeded' when rate limit is exceeded\n   */\n  status: 'disabled' | 'executing' | 'exceeded' | 'idle'\n  /**\n   * Number of function executions that have completed successfully\n   */\n  successCount: number\n}\n\nfunction getDefaultAsyncRateLimiterState<\n  TFn extends AnyAsyncFunction,\n>(): AsyncRateLimiterState<TFn> {\n  return {\n    errorCount: 0,\n    executionTimes: [],\n    isExceeded: false,\n    isExecuting: false,\n    lastResult: undefined,\n    rejectionCount: 0,\n    settleCount: 0,\n    successCount: 0,\n    status: 'idle',\n  }\n}\n\n/**\n * Options for configuring an async rate-limited function\n */\nexport interface AsyncRateLimiterOptions<TFn extends AnyAsyncFunction> {\n  /**\n   * Whether the rate limiter is enabled. When disabled, maybeExecute will not trigger any executions.\n   * Can be a boolean or a function that returns a boolean.\n   * Defaults to true.\n   */\n  enabled?: boolean | ((rateLimiter: AsyncRateLimiter<TFn>) => boolean)\n  /**\n   * Initial state for the rate limiter\n   */\n  initialState?: Partial<AsyncRateLimiterState<TFn>>\n  /**\n   * Maximum number of executions allowed within the time window.\n   * Can be a number or a function that returns a number.\n   */\n  limit: number | ((rateLimiter: AsyncRateLimiter<TFn>) => number)\n  /**\n   * Optional error handler for when the rate-limited function throws.\n   * If provided, the handler will be called with the error and rate limiter instance.\n   * This can be used alongside throwOnError - the handler will be called before any error is thrown.\n   */\n  onError?: (error: unknown, rateLimiter: AsyncRateLimiter<TFn>) => void\n  /**\n   * Optional callback function that is called when an execution is rejected due to rate limiting\n   */\n  onReject?: (rateLimiter: AsyncRateLimiter<TFn>) => void\n  /**\n   * Optional function to call when the rate-limited function is executed\n   */\n  onSettled?: (rateLimiter: AsyncRateLimiter<TFn>) => void\n  /**\n   * Optional function to call when the rate-limited function is executed\n   */\n  onSuccess?: (\n    result: ReturnType<TFn>,\n    rateLimiter: AsyncRateLimiter<TFn>,\n  ) => void\n  /**\n   * Whether to throw errors when they occur.\n   * Defaults to true if no onError handler is provided, false if an onError handler is provided.\n   * Can be explicitly set to override these defaults.\n   */\n  throwOnError?: boolean\n  /**\n   * Time window in milliseconds within which the limit applies.\n   * Can be a number or a function that returns a number.\n   */\n  window: number | ((rateLimiter: AsyncRateLimiter<TFn>) => number)\n  /**\n   * Type of window to use for rate limiting\n   * - 'fixed': Uses a fixed window that resets after the window period\n   * - 'sliding': Uses a sliding window that allows executions as old ones expire\n   * Defaults to 'fixed'\n   */\n  windowType?: 'fixed' | 'sliding'\n}\n\nconst defaultOptions: Omit<\n  Required<AsyncRateLimiterOptions<any>>,\n  'initialState' | 'onError' | 'onReject' | 'onSettled' | 'onSuccess'\n> = {\n  enabled: true,\n  limit: 1,\n  window: 0,\n  windowType: 'fixed',\n  throwOnError: true,\n}\n\n/**\n * A class that creates an async rate-limited function.\n *\n * Rate limiting is a simple approach that allows a function to execute up to a limit within a time window,\n * then blocks all subsequent calls until the window passes. This can lead to \"bursty\" behavior where\n * all executions happen immediately, followed by a complete block.\n *\n * The rate limiter supports two types of windows:\n * - 'fixed': A strict window that resets after the window period. All executions within the window count\n *   towards the limit, and the window resets completely after the period.\n * - 'sliding': A rolling window that allows executions as old ones expire. This provides a more\n *   consistent rate of execution over time.\n *\n * Unlike the non-async RateLimiter, this async version supports returning values from the rate-limited function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the rate-limited function.\n *\n * For smoother execution patterns, consider using:\n * - Throttling: Ensures consistent spacing between executions (e.g. max once per 200ms)\n * - Debouncing: Waits for a pause in calls before executing (e.g. after 500ms of no calls)\n *\n * Rate limiting is best used for hard API limits or resource constraints. For UI updates or\n * smoothing out frequent events, throttling or debouncing usually provide better user experience.\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the rate limiter\n * - `initialState` can be a partial state object\n * - Use `onSuccess` callback to react to successful function execution and implement custom logic\n * - Use `onError` callback to react to function execution errors and implement custom error handling\n * - Use `onSettled` callback to react to function execution completion (success or error) and implement custom logic\n * - Use `onReject` callback to react to executions being rejected when rate limit is exceeded\n * - The state includes execution times, success/error counts, and current execution status\n * - State can be accessed via `asyncRateLimiter.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `asyncRateLimiter.state`\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and rate limiter instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncRateLimiter instance\n * - Rate limit rejections (when limit is exceeded) are handled separately from execution errors via the `onReject` handler\n *\n * @example\n * ```ts\n * const rateLimiter = new AsyncRateLimiter(\n *   async (id: string) => await api.getData(id),\n *   {\n *     limit: 5,\n *     window: 1000,\n *     windowType: 'sliding',\n *     onError: (error) => {\n *       console.error('API call failed:', error);\n *     },\n *     onReject: (limiter) => {\n *       console.log(`Rate limit exceeded. Try again in ${limiter.getMsUntilNextWindow()}ms`);\n *     }\n *   }\n * );\n *\n * // Will execute immediately until limit reached, then block\n * // Returns the API response directly\n * const data = await rateLimiter.maybeExecute('123');\n * ```\n */\nexport class AsyncRateLimiter<TFn extends AnyAsyncFunction> {\n  readonly store: Store<Readonly<AsyncRateLimiterState<TFn>>> = new Store<\n    AsyncRateLimiterState<TFn>\n  >(getDefaultAsyncRateLimiterState<TFn>())\n  options: AsyncRateLimiterOptions<TFn>\n  #timeoutIds: Set<NodeJS.Timeout> = new Set()\n\n  constructor(\n    private fn: TFn,\n    initialOptions: AsyncRateLimiterOptions<TFn>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n      throwOnError: initialOptions.throwOnError ?? !initialOptions.onError,\n    }\n    this.#setState(this.options.initialState ?? {})\n    for (const executionTime of this.#getExecutionTimesInWindow()) {\n      this.#setCleanupTimeout(executionTime)\n    }\n  }\n\n  /**\n   * Updates the async rate limiter options\n   */\n  setOptions = (newOptions: Partial<AsyncRateLimiterOptions<TFn>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<AsyncRateLimiterState<TFn>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const isExceeded = combinedState.executionTimes.length >= this.#getLimit()\n      const status = !this.#getEnabled()\n        ? 'disabled'\n        : combinedState.isExecuting\n          ? 'executing'\n          : isExceeded\n            ? 'exceeded'\n            : 'idle'\n      return {\n        ...combinedState,\n        isExceeded,\n        status,\n      }\n    })\n  }\n\n  /**\n   * Returns the current enabled state of the async rate limiter\n   */\n  #getEnabled = (): boolean => {\n    return !!parseFunctionOrValue(this.options.enabled, this)\n  }\n\n  /**\n   * Returns the current limit of executions allowed within the time window\n   */\n  #getLimit = (): number => {\n    return parseFunctionOrValue(this.options.limit, this)\n  }\n\n  /**\n   * Returns the current time window in milliseconds\n   */\n  #getWindow = (): number => {\n    return parseFunctionOrValue(this.options.window, this)\n  }\n\n  /**\n   * Attempts to execute the rate-limited function if within the configured limits.\n   * Will reject execution if the number of calls in the current window exceeds the limit.\n   *\n   * Error Handling:\n   * - If the rate-limited function throws and no `onError` handler is configured,\n   *   the error will be thrown from this method.\n   * - If an `onError` handler is configured, errors will be caught and passed to the handler,\n   *   and this method will return undefined.\n   * - The error state can be checked using `getErrorCount()` and `getIsExecuting()`.\n   *\n   * @returns A promise that resolves with the function's return value, or undefined if an error occurred and was handled by onError\n   * @throws The error from the rate-limited function if no onError handler is configured\n   *\n   * @example\n   * ```ts\n   * const rateLimiter = new AsyncRateLimiter(fn, { limit: 5, window: 1000 });\n   *\n   * // First 5 calls will return a promise that resolves with the result\n   * const result = await rateLimiter.maybeExecute('arg1', 'arg2');\n   *\n   * // Additional calls within the window will return undefined\n   * const result2 = await rateLimiter.maybeExecute('arg1', 'arg2'); // undefined\n   * ```\n   */\n  maybeExecute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    this.#cleanupOldExecutions()\n\n    const relevantExecutionTimes = this.#getExecutionTimesInWindow()\n\n    if (relevantExecutionTimes.length < this.#getLimit()) {\n      await this.#execute(...args)\n      return this.store.state.lastResult\n    }\n\n    this.#setState({\n      rejectionCount: this.store.state.rejectionCount + 1,\n    })\n    this.options.onReject?.(this)\n    return undefined\n  }\n\n  #execute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    if (!this.#getEnabled()) return\n\n    const now = Date.now()\n    const executionTimes = [...this.store.state.executionTimes, now]\n    this.#setState({\n      isExecuting: true,\n      executionTimes,\n    })\n\n    try {\n      const result = await this.fn(...args) // EXECUTE!\n      this.#setCleanupTimeout(now)\n      this.#setState({\n        successCount: this.store.state.successCount + 1,\n        lastResult: result,\n      })\n      this.options.onSuccess?.(result, this)\n    } catch (error) {\n      this.#setState({\n        errorCount: this.store.state.errorCount + 1,\n      })\n      this.options.onError?.(error, this)\n      if (this.options.throwOnError) {\n        throw error\n      }\n    } finally {\n      this.#setState({\n        isExecuting: false,\n        settleCount: this.store.state.settleCount + 1,\n      })\n      this.options.onSettled?.(this)\n    }\n\n    return this.store.state.lastResult\n  }\n\n  #getExecutionTimesInWindow = (): Array<number> => {\n    if (this.options.windowType === 'sliding') {\n      // For sliding window, return all executions within the current window\n      return this.store.state.executionTimes.filter(\n        (time) => time > Date.now() - this.#getWindow(),\n      )\n    } else {\n      // For fixed window, return all executions in the current window\n      // The window starts from the oldest execution time\n      if (this.store.state.executionTimes.length === 0) {\n        return []\n      }\n      const oldestExecution = Math.min(...this.store.state.executionTimes)\n      const windowStart = oldestExecution\n      const windowEnd = windowStart + this.#getWindow()\n      const now = Date.now()\n\n      // If the window has expired, return empty array\n      if (now > windowEnd) {\n        return []\n      }\n\n      // Otherwise, return all executions in the current window\n      return this.store.state.executionTimes.filter(\n        (time) => time >= windowStart && time <= windowEnd,\n      )\n    }\n  }\n\n  #setCleanupTimeout = (executionTime: number): void => {\n    if (\n      this.options.windowType === 'sliding' ||\n      this.#timeoutIds.size === 0 // new fixed window\n    ) {\n      const now = Date.now()\n      const timeUntilExpiration = executionTime - now + this.#getWindow() + 1\n      const timeoutId = setTimeout(() => {\n        this.#cleanupOldExecutions()\n        this.#clearTimeout(timeoutId)\n      }, timeUntilExpiration)\n      this.#timeoutIds.add(timeoutId)\n    }\n  }\n\n  #clearTimeout = (timeoutId: NodeJS.Timeout): void => {\n    clearTimeout(timeoutId)\n    this.#timeoutIds.delete(timeoutId)\n  }\n\n  #clearTimeouts = (): void => {\n    this.#timeoutIds.forEach((timeoutId) => clearTimeout(timeoutId))\n    this.#timeoutIds.clear()\n  }\n\n  #cleanupOldExecutions = (): void => {\n    this.#setState({\n      executionTimes: this.#getExecutionTimesInWindow(),\n    })\n  }\n\n  /**\n   * Returns the number of remaining executions allowed in the current window\n   */\n  getRemainingInWindow = (): number => {\n    const relevantExecutionTimes = this.#getExecutionTimesInWindow()\n    return Math.max(0, this.#getLimit() - relevantExecutionTimes.length)\n  }\n\n  /**\n   * Returns the number of milliseconds until the next execution will be possible\n   * For fixed windows, this is the time until the current window resets\n   * For sliding windows, this is the time until the oldest execution expires\n   */\n  getMsUntilNextWindow = (): number => {\n    if (this.getRemainingInWindow() > 0) {\n      return 0\n    }\n    const oldestExecution = this.store.state.executionTimes[0] ?? Infinity\n    return oldestExecution + this.#getWindow() - Date.now()\n  }\n\n  /**\n   * Resets the rate limiter state\n   */\n  reset = (): void => {\n    this.#setState(getDefaultAsyncRateLimiterState())\n    this.#clearTimeouts()\n  }\n}\n\n/**\n * Creates an async rate-limited function that will execute the provided function up to a maximum number of times within a time window.\n *\n * Unlike the non-async rate limiter, this async version supports returning values from the rate-limited function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the rate-limited function.\n *\n * The rate limiter supports two types of windows:\n * - 'fixed': A strict window that resets after the window period. All executions within the window count\n *   towards the limit, and the window resets completely after the period.\n * - 'sliding': A rolling window that allows executions as old ones expire. This provides a more\n *   consistent rate of execution over time.\n *\n * Note that rate limiting is a simpler form of execution control compared to throttling or debouncing:\n * - A rate limiter will allow all executions until the limit is reached, then block all subsequent calls until the window resets\n * - A throttler ensures even spacing between executions, which can be better for consistent performance\n * - A debouncer collapses multiple calls into one, which is better for handling bursts of events\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the rate limiter\n * - `initialState` can be a partial state object\n * - Use `onSuccess` callback to react to successful function execution and implement custom logic\n * - Use `onError` callback to react to function execution errors and implement custom error handling\n * - Use `onSettled` callback to react to function execution completion (success or error) and implement custom logic\n * - Use `onReject` callback to react to executions being rejected when rate limit is exceeded\n * - The state includes execution times, success/error counts, and current execution status\n * - State can be accessed via the underlying AsyncRateLimiter instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * Consider using throttle() or debounce() if you need more intelligent execution control. Use rate limiting when you specifically\n * need to enforce a hard limit on the number of executions within a time period.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and rate limiter instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncRateLimiter instance\n * - Rate limit rejections (when limit is exceeded) are handled separately from execution errors via the `onReject` handler\n *\n * @example\n * ```ts\n * // Rate limit to 5 calls per minute with a sliding window\n * const rateLimited = asyncRateLimit(makeApiCall, {\n *   limit: 5,\n *   window: 60000,\n *   windowType: 'sliding',\n *   onError: (error) => {\n *     console.error('API call failed:', error);\n *   },\n *   onReject: (rateLimiter) => {\n *     console.log(`Rate limit exceeded. Try again in ${rateLimiter.getMsUntilNextWindow()}ms`);\n *   }\n * });\n *\n * // First 5 calls will execute immediately\n * // Additional calls will be rejected until the minute window resets\n * // Returns the API response directly\n * const result = await rateLimited();\n *\n * // For more even execution, consider using throttle instead:\n * const throttled = throttle(makeApiCall, { wait: 12000 }); // One call every 12 seconds\n * ```\n */\nexport function asyncRateLimit<TFn extends AnyAsyncFunction>(\n  fn: TFn,\n  initialOptions: AsyncRateLimiterOptions<TFn>,\n) {\n  const rateLimiter = new AsyncRateLimiter(fn, initialOptions)\n  return rateLimiter.maybeExecute\n}\n"],"names":["Store","parseFunctionOrValue"],"mappings":";;;;AA2CA,SAAS,kCAEuB;AAC9B,SAAO;AAAA,IACL,YAAY;AAAA,IACZ,gBAAgB,CAAA;AAAA,IAChB,YAAY;AAAA,IACZ,aAAa;AAAA,IACb,YAAY;AAAA,IACZ,gBAAgB;AAAA,IAChB,aAAa;AAAA,IACb,cAAc;AAAA,IACd,QAAQ;AAAA,EAAA;AAEZ;AA8DA,MAAM,iBAGF;AAAA,EACF,SAAS;AAAA,EACT,OAAO;AAAA,EACP,QAAQ;AAAA,EACR,YAAY;AAAA,EACZ,cAAc;AAChB;AAoEO,MAAM,iBAA+C;AAAA,EAO1D,YACU,IACR,gBACA;AAFQ,SAAA,KAAA;AAPV,SAAS,QAAqD,IAAIA,MAAAA,MAEhE,gCAAA,CAAsC;AAExC,SAAA,kCAAuC,IAAA;AAoBvC,SAAA,aAAa,CAAC,eAA4D;AACxE,WAAK,UAAU,EAAE,GAAG,KAAK,SAAS,GAAG,WAAA;AAAA,IAAW;AAGlD,SAAA,YAAY,CAAC,aAAwD;AACnE,WAAK,MAAM,SAAS,CAAC,UAAU;AAC7B,cAAM,gBAAgB;AAAA,UACpB,GAAG;AAAA,UACH,GAAG;AAAA,QAAA;AAEL,cAAM,aAAa,cAAc,eAAe,UAAU,KAAK,UAAA;AAC/D,cAAM,SAAS,CAAC,KAAK,gBACjB,aACA,cAAc,cACZ,cACA,aACE,aACA;AACR,eAAO;AAAA,UACL,GAAG;AAAA,UACH;AAAA,UACA;AAAA,QAAA;AAAA,MACF,CACD;AAAA,IAAA;AAMH,SAAA,cAAc,MAAe;AAC3B,aAAO,CAAC,CAACC,MAAAA,qBAAqB,KAAK,QAAQ,SAAS,IAAI;AAAA,IAAA;AAM1D,SAAA,YAAY,MAAc;AACxB,aAAOA,MAAAA,qBAAqB,KAAK,QAAQ,OAAO,IAAI;AAAA,IAAA;AAMtD,SAAA,aAAa,MAAc;AACzB,aAAOA,MAAAA,qBAAqB,KAAK,QAAQ,QAAQ,IAAI;AAAA,IAAA;AA4BvD,SAAA,eAAe,UACV,SACsC;AACzC,WAAK,sBAAA;AAEL,YAAM,yBAAyB,KAAK,2BAAA;AAEpC,UAAI,uBAAuB,SAAS,KAAK,UAAA,GAAa;AACpD,cAAM,KAAK,SAAS,GAAG,IAAI;AAC3B,eAAO,KAAK,MAAM,MAAM;AAAA,MAAA;AAG1B,WAAK,UAAU;AAAA,QACb,gBAAgB,KAAK,MAAM,MAAM,iBAAiB;AAAA,MAAA,CACnD;AACD,WAAK,QAAQ,WAAW,IAAI;AAC5B,aAAO;AAAA,IAAA;AAGT,SAAA,WAAW,UACN,SACsC;AACzC,UAAI,CAAC,KAAK,cAAe;AAEzB,YAAM,MAAM,KAAK,IAAA;AACjB,YAAM,iBAAiB,CAAC,GAAG,KAAK,MAAM,MAAM,gBAAgB,GAAG;AAC/D,WAAK,UAAU;AAAA,QACb,aAAa;AAAA,QACb;AAAA,MAAA,CACD;AAED,UAAI;AACF,cAAM,SAAS,MAAM,KAAK,GAAG,GAAG,IAAI;AACpC,aAAK,mBAAmB,GAAG;AAC3B,aAAK,UAAU;AAAA,UACb,cAAc,KAAK,MAAM,MAAM,eAAe;AAAA,UAC9C,YAAY;AAAA,QAAA,CACb;AACD,aAAK,QAAQ,YAAY,QAAQ,IAAI;AAAA,MAAA,SAC9B,OAAO;AACd,aAAK,UAAU;AAAA,UACb,YAAY,KAAK,MAAM,MAAM,aAAa;AAAA,QAAA,CAC3C;AACD,aAAK,QAAQ,UAAU,OAAO,IAAI;AAClC,YAAI,KAAK,QAAQ,cAAc;AAC7B,gBAAM;AAAA,QAAA;AAAA,MACR,UACF;AACE,aAAK,UAAU;AAAA,UACb,aAAa;AAAA,UACb,aAAa,KAAK,MAAM,MAAM,cAAc;AAAA,QAAA,CAC7C;AACD,aAAK,QAAQ,YAAY,IAAI;AAAA,MAAA;AAG/B,aAAO,KAAK,MAAM,MAAM;AAAA,IAAA;AAG1B,SAAA,6BAA6B,MAAqB;AAChD,UAAI,KAAK,QAAQ,eAAe,WAAW;AAEzC,eAAO,KAAK,MAAM,MAAM,eAAe;AAAA,UACrC,CAAC,SAAS,OAAO,KAAK,IAAA,IAAQ,KAAK,WAAA;AAAA,QAAW;AAAA,MAChD,OACK;AAGL,YAAI,KAAK,MAAM,MAAM,eAAe,WAAW,GAAG;AAChD,iBAAO,CAAA;AAAA,QAAC;AAEV,cAAM,kBAAkB,KAAK,IAAI,GAAG,KAAK,MAAM,MAAM,cAAc;AACnE,cAAM,cAAc;AACpB,cAAM,YAAY,cAAc,KAAK,WAAA;AACrC,cAAM,MAAM,KAAK,IAAA;AAGjB,YAAI,MAAM,WAAW;AACnB,iBAAO,CAAA;AAAA,QAAC;AAIV,eAAO,KAAK,MAAM,MAAM,eAAe;AAAA,UACrC,CAAC,SAAS,QAAQ,eAAe,QAAQ;AAAA,QAAA;AAAA,MAC3C;AAAA,IACF;AAGF,SAAA,qBAAqB,CAAC,kBAAgC;AACpD,UACE,KAAK,QAAQ,eAAe,aAC5B,KAAK,YAAY,SAAS,GAC1B;AACA,cAAM,MAAM,KAAK,IAAA;AACjB,cAAM,sBAAsB,gBAAgB,MAAM,KAAK,eAAe;AACtE,cAAM,YAAY,WAAW,MAAM;AACjC,eAAK,sBAAA;AACL,eAAK,cAAc,SAAS;AAAA,QAAA,GAC3B,mBAAmB;AACtB,aAAK,YAAY,IAAI,SAAS;AAAA,MAAA;AAAA,IAChC;AAGF,SAAA,gBAAgB,CAAC,cAAoC;AACnD,mBAAa,SAAS;AACtB,WAAK,YAAY,OAAO,SAAS;AAAA,IAAA;AAGnC,SAAA,iBAAiB,MAAY;AAC3B,WAAK,YAAY,QAAQ,CAAC,cAAc,aAAa,SAAS,CAAC;AAC/D,WAAK,YAAY,MAAA;AAAA,IAAM;AAGzB,SAAA,wBAAwB,MAAY;AAClC,WAAK,UAAU;AAAA,QACb,gBAAgB,KAAK,2BAAA;AAAA,MAA2B,CACjD;AAAA,IAAA;AAMH,SAAA,uBAAuB,MAAc;AACnC,YAAM,yBAAyB,KAAK,2BAAA;AACpC,aAAO,KAAK,IAAI,GAAG,KAAK,UAAA,IAAc,uBAAuB,MAAM;AAAA,IAAA;AAQrE,SAAA,uBAAuB,MAAc;AACnC,UAAI,KAAK,qBAAA,IAAyB,GAAG;AACnC,eAAO;AAAA,MAAA;AAET,YAAM,kBAAkB,KAAK,MAAM,MAAM,eAAe,CAAC,KAAK;AAC9D,aAAO,kBAAkB,KAAK,WAAA,IAAe,KAAK,IAAA;AAAA,IAAI;AAMxD,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,iCAAiC;AAChD,WAAK,eAAA;AAAA,IAAe;AAtOpB,SAAK,UAAU;AAAA,MACb,GAAG;AAAA,MACH,GAAG;AAAA,MACH,cAAc,eAAe,gBAAgB,CAAC,eAAe;AAAA,IAAA;AAE/D,SAAK,UAAU,KAAK,QAAQ,gBAAgB,CAAA,CAAE;AAC9C,eAAW,iBAAiB,KAAK,8BAA8B;AAC7D,WAAK,mBAAmB,aAAa;AAAA,IAAA;AAAA,EACvC;AAAA,EAdF;AAAA,EAwBA;AAAA,EAyBA;AAAA,EAOA;AAAA,EAOA;AAAA,EAgDA;AAAA,EAuCA;AAAA,EA6BA;AAAA,EAeA;AAAA,EAKA;AAAA,EAKA;AAkCF;AAmEO,SAAS,eACd,IACA,gBACA;AACA,QAAM,cAAc,IAAI,iBAAiB,IAAI,cAAc;AAC3D,SAAO,YAAY;AACrB;;;"}

dist/cjs/async-rate-limiter.d.cts

@@ -13,2 +13,6 @@ import { Store } from '@tanstack/store';
     /**
+     * Whether the rate limiter has exceeded the limit
+     */
+    isExceeded: boolean;
+    /**
      * Whether the rate-limited function is currently executing asynchronously
@@ -30,2 +34,6 @@ */
     /**
+     * Current execution status - 'disabled' when not active, 'executing' when executing, 'idle' when not executing, 'exceeded' when rate limit is exceeded
+     */
+    status: 'disabled' | 'executing' | 'exceeded' | 'idle';
+    /**
      * Number of function executions that have completed successfully
@@ -32,0 +40,0 @@ */

dist/cjs/async-throttler.cjs

@@ -32,2 +32,3 @@ "use strict";
     this.#resolvePreviousPromise = null;
+    this.#rejectPreviousPromise = null;
     this.setOptions = (newOptions) => {
@@ -69,4 +70,5 @@ this.options = { ...this.options, ...newOptions };
       } else {
-        return new Promise((resolve) => {
+        return new Promise((resolve, reject) => {
           this.#resolvePreviousPromise = resolve;
+          this.#rejectPreviousPromise = reject;
           this.#clearTimeout();
@@ -105,5 +107,3 @@ if (this.options.trailing) {
         if (this.options.throwOnError) {
-          throw error;
-        } else {
-          console.error(error);
+          this.#rejectPreviousPromiseInternal(error);
         }
@@ -125,8 +125,11 @@ } finally {
     };
-    this.flush = () => {
+    this.flush = async () => {
       if (this.store.state.isPending && this.store.state.lastArgs) {
         this.#abortExecution();
         this.#clearTimeout();
-        this.#execute(...this.store.state.lastArgs);
+        const result = await this.#execute(...this.store.state.lastArgs);
+        this.#resolvePreviousPromiseInternal();
+        return result;
       }
+      return void 0;
     };
@@ -139,2 +142,8 @@ this.#resolvePreviousPromiseInternal = () => {
     };
+    this.#rejectPreviousPromiseInternal = (error) => {
+      if (this.#rejectPreviousPromise) {
+        this.#rejectPreviousPromise(error);
+        this.#rejectPreviousPromise = null;
+      }
+    };
     this.#clearTimeout = () => {
@@ -181,2 +190,3 @@ if (this.#timeoutId) {
   #resolvePreviousPromise;
+  #rejectPreviousPromise;
   #setState;
@@ -187,2 +197,3 @@ #getEnabled;
   #resolvePreviousPromiseInternal;
+  #rejectPreviousPromiseInternal;
   #clearTimeout;
@@ -189,0 +200,0 @@ #cancelPendingExecution;

dist/cjs/async-throttler.cjs.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"async-throttler.cjs","sources":["../../src/async-throttler.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { AnyAsyncFunction, OptionalKeys } from './types'\n\nexport interface AsyncThrottlerState<TFn extends AnyAsyncFunction> {\n  /**\n   * Number of function executions that have resulted in errors\n   */\n  errorCount: number\n  /**\n   * Whether the throttled function is currently executing asynchronously\n   */\n  isExecuting: boolean\n  /**\n   * Whether the throttler is waiting for the timeout to trigger execution\n   */\n  isPending: boolean\n  /**\n   * The arguments from the most recent call to maybeExecute\n   */\n  lastArgs: Parameters<TFn> | undefined\n  /**\n   * Timestamp of the last function execution in milliseconds\n   */\n  lastExecutionTime: number\n  /**\n   * The result from the most recent successful function execution\n   */\n  lastResult: ReturnType<TFn> | undefined\n  /**\n   * Timestamp when the next execution can occur in milliseconds\n   */\n  nextExecutionTime: number\n  /**\n   * Number of function executions that have completed (either successfully or with errors)\n   */\n  settleCount: number\n  /**\n   * Current execution status - 'idle' when not active, 'pending' when waiting, 'executing' when running, 'settled' when completed\n   */\n  status: 'disabled' | 'idle' | 'pending' | 'executing' | 'settled'\n  /**\n   * Number of function executions that have completed successfully\n   */\n  successCount: number\n}\n\nfunction getDefaultAsyncThrottlerState<\n  TFn extends AnyAsyncFunction,\n>(): AsyncThrottlerState<TFn> {\n  return structuredClone({\n    errorCount: 0,\n    isExecuting: false,\n    isPending: false,\n    lastArgs: undefined,\n    lastExecutionTime: 0,\n    lastResult: undefined,\n    nextExecutionTime: 0,\n    settleCount: 0,\n    status: 'idle',\n    successCount: 0,\n  })\n}\n\n/**\n * Options for configuring an async throttled function\n */\nexport interface AsyncThrottlerOptions<TFn extends AnyAsyncFunction> {\n  /**\n   * Whether the throttler is enabled. When disabled, maybeExecute will not trigger any executions.\n   * Can be a boolean or a function that returns a boolean.\n   * Defaults to true.\n   */\n  enabled?: boolean | ((throttler: AsyncThrottler<TFn>) => boolean)\n  /**\n   * Initial state for the async throttler\n   */\n  initialState?: Partial<AsyncThrottlerState<TFn>>\n  /**\n   * Whether to execute the function immediately when called\n   * Defaults to true\n   */\n  leading?: boolean\n  /**\n   * Optional error handler for when the throttled function throws.\n   * If provided, the handler will be called with the error and throttler instance.\n   * This can be used alongside throwOnError - the handler will be called before any error is thrown.\n   */\n  onError?: (error: unknown, asyncThrottler: AsyncThrottler<TFn>) => void\n  /**\n   * Optional function to call when the throttled function is executed\n   */\n  onSettled?: (asyncThrottler: AsyncThrottler<TFn>) => void\n  /**\n   * Optional function to call when the throttled function is executed\n   */\n  onSuccess?: (\n    result: ReturnType<TFn>,\n    asyncThrottler: AsyncThrottler<TFn>,\n  ) => void\n  /**\n   * Whether to throw errors when they occur.\n   * Defaults to true if no onError handler is provided, false if an onError handler is provided.\n   * Can be explicitly set to override these defaults.\n   */\n  throwOnError?: boolean\n  /**\n   * Whether to execute the function on the trailing edge of the wait period\n   * Defaults to true\n   */\n  trailing?: boolean\n  /**\n   * Time window in milliseconds during which the function can only be executed once.\n   * Can be a number or a function that returns a number.\n   * Defaults to 0ms\n   */\n  wait: number | ((throttler: AsyncThrottler<TFn>) => number)\n}\n\ntype AsyncThrottlerOptionsWithOptionalCallbacks = OptionalKeys<\n  AsyncThrottlerOptions<any>,\n  'initialState' | 'onError' | 'onSettled' | 'onSuccess'\n>\n\nconst defaultOptions: AsyncThrottlerOptionsWithOptionalCallbacks = {\n  enabled: true,\n  leading: true,\n  trailing: true,\n  wait: 0,\n}\n\n/**\n * A class that creates an async throttled function.\n *\n * Throttling limits how often a function can be executed, allowing only one execution within a specified time window.\n * Unlike debouncing which resets the delay timer on each call, throttling ensures the function executes at a\n * regular interval regardless of how often it's called.\n *\n * Unlike the non-async Throttler, this async version supports returning values from the throttled function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the throttled function.\n *\n * This is useful for rate-limiting API calls, handling scroll/resize events, or any scenario where you want to\n * ensure a maximum execution frequency.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and throttler instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncThrottler instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async throttler\n * - Use `onSuccess` callback to react to successful function execution and implement custom logic\n * - Use `onError` callback to react to function execution errors and implement custom error handling\n * - Use `onSettled` callback to react to function execution completion (success or error) and implement custom logic\n * - The state includes error count, execution status, last execution time, and success/settle counts\n * - State can be accessed via `asyncThrottler.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `asyncThrottler.state`\n *\n * @example\n * ```ts\n * const throttler = new AsyncThrottler(async (value: string) => {\n *   const result = await saveToAPI(value);\n *   return result; // Return value is preserved\n * }, {\n *   wait: 1000,\n *   onError: (error) => {\n *     console.error('API call failed:', error);\n *   }\n * });\n *\n * // Will only execute once per second no matter how often called\n * // Returns the API response directly\n * const result = await throttler.maybeExecute(inputElement.value);\n * ```\n */\nexport class AsyncThrottler<TFn extends AnyAsyncFunction> {\n  readonly store: Store<Readonly<AsyncThrottlerState<TFn>>> = new Store<\n    AsyncThrottlerState<TFn>\n  >(getDefaultAsyncThrottlerState<TFn>())\n  options: AsyncThrottlerOptions<TFn>\n  #abortController: AbortController | null = null\n  #timeoutId: NodeJS.Timeout | null = null\n  #resolvePreviousPromise:\n    | ((value?: ReturnType<TFn> | undefined) => void)\n    | null = null\n\n  constructor(\n    private fn: TFn,\n    initialOptions: AsyncThrottlerOptions<TFn>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n      throwOnError: initialOptions.throwOnError ?? !initialOptions.onError,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the async throttler options\n   */\n  setOptions = (newOptions: Partial<AsyncThrottlerOptions<TFn>>): void => {\n    this.options = { ...this.options, ...newOptions }\n\n    // End the pending state if the throttler is disabled\n    if (!this.#getEnabled()) {\n      this.cancel()\n    }\n  }\n\n  #setState = (newState: Partial<AsyncThrottlerState<TFn>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const { isPending, isExecuting, settleCount } = combinedState\n      return {\n        ...combinedState,\n        status: !this.#getEnabled()\n          ? 'disabled'\n          : isPending\n            ? 'pending'\n            : isExecuting\n              ? 'executing'\n              : settleCount > 0\n                ? 'settled'\n                : 'idle',\n      }\n    })\n  }\n\n  /**\n   * Returns the current enabled state of the async throttler\n   */\n  #getEnabled = (): boolean => {\n    return !!parseFunctionOrValue(this.options.enabled, this)\n  }\n\n  /**\n   * Returns the current wait time in milliseconds\n   */\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait, this)\n  }\n\n  /**\n   * Attempts to execute the throttled function. The execution behavior depends on the throttler options:\n   *\n   * - If enough time has passed since the last execution (>= wait period):\n   *   - With leading=true: Executes immediately\n   *   - With leading=false: Waits for the next trailing execution\n   *\n   * - If within the wait period:\n   *   - With trailing=true: Schedules execution for end of wait period\n   *   - With trailing=false: Drops the execution\n   *\n   * @example\n   * ```ts\n   * const throttled = new AsyncThrottler(fn, { wait: 1000 });\n   *\n   * // First call executes immediately\n   * await throttled.maybeExecute('a', 'b');\n   *\n   * // Call during wait period - gets throttled\n   * await throttled.maybeExecute('c', 'd');\n   * ```\n   */\n  maybeExecute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    if (!this.#getEnabled()) return undefined\n    const now = Date.now()\n    const timeSinceLastExecution = now - this.store.state.lastExecutionTime\n    const wait = this.#getWait()\n    // Store the most recent arguments for potential trailing execution\n    this.#setState({ lastArgs: args })\n\n    this.#resolvePreviousPromiseInternal()\n\n    // Handle leading execution\n    if (this.options.leading && timeSinceLastExecution >= wait) {\n      await this.#execute(...args)\n      return this.store.state.lastResult\n    } else {\n      return new Promise((resolve) => {\n        this.#resolvePreviousPromise = resolve\n        // Clear any existing timeout to ensure we use the latest arguments\n        this.#clearTimeout()\n\n        // Set up trailing execution if enabled\n        if (this.options.trailing) {\n          const _timeSinceLastExecution = this.store.state.lastExecutionTime\n            ? now - this.store.state.lastExecutionTime\n            : 0\n          const timeoutDuration = wait - _timeSinceLastExecution\n          this.#setState({ isPending: true })\n          this.#timeoutId = setTimeout(async () => {\n            if (this.store.state.lastArgs !== undefined) {\n              await this.#execute(...this.store.state.lastArgs)\n            }\n            this.#resolvePreviousPromise = null\n            resolve(this.store.state.lastResult)\n          }, timeoutDuration)\n        }\n      })\n    }\n  }\n\n  #execute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    if (!this.#getEnabled() || this.store.state.isExecuting) return undefined\n    this.#abortController = new AbortController()\n    try {\n      this.#setState({ isExecuting: true })\n      const result = await this.fn(...args) // EXECUTE!\n      this.#setState({\n        lastResult: result,\n        successCount: this.store.state.successCount + 1,\n      })\n      this.options.onSuccess?.(result, this)\n    } catch (error) {\n      this.#setState({\n        errorCount: this.store.state.errorCount + 1,\n      })\n      this.options.onError?.(error, this)\n      if (this.options.throwOnError) {\n        throw error\n      } else {\n        console.error(error)\n      }\n    } finally {\n      const lastExecutionTime = Date.now()\n      const nextExecutionTime = lastExecutionTime + this.#getWait()\n      this.#setState({\n        isExecuting: false,\n        isPending: false,\n        settleCount: this.store.state.settleCount + 1,\n        lastExecutionTime,\n        nextExecutionTime,\n      })\n      this.#abortController = null\n      this.options.onSettled?.(this)\n    }\n    return this.store.state.lastResult\n  }\n\n  /**\n   * Processes the current pending execution immediately\n   */\n  flush = (): void => {\n    if (this.store.state.isPending && this.store.state.lastArgs) {\n      this.#abortExecution() // abort any current execution\n      this.#clearTimeout() // clear any existing timeout\n      this.#execute(...this.store.state.lastArgs)\n    }\n  }\n\n  #resolvePreviousPromiseInternal = (): void => {\n    if (this.#resolvePreviousPromise) {\n      this.#resolvePreviousPromise(this.store.state.lastResult)\n      this.#resolvePreviousPromise = null\n    }\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = null\n    }\n  }\n\n  #cancelPendingExecution = (): void => {\n    this.#clearTimeout()\n    if (this.#resolvePreviousPromise) {\n      this.#resolvePreviousPromise(this.store.state.lastResult)\n      this.#resolvePreviousPromise = null\n    }\n    this.#setState({\n      isPending: false,\n      isExecuting: false,\n      lastArgs: undefined,\n    })\n  }\n\n  #abortExecution = (): void => {\n    if (this.#abortController) {\n      this.#abortController.abort()\n      this.#abortController = null\n    }\n  }\n\n  /**\n   * Cancels any pending execution or aborts any execution in progress\n   */\n  cancel = (): void => {\n    this.#cancelPendingExecution()\n    this.#abortExecution()\n  }\n\n  /**\n   * Resets the debouncer state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultAsyncThrottlerState<TFn>())\n  }\n}\n\n/**\n * Creates an async throttled function that limits how often the function can execute.\n * The throttled function will execute at most once per wait period, even if called multiple times.\n * If called while executing, it will wait until execution completes before scheduling the next call.\n *\n * Unlike the non-async Throttler, this async version supports returning values from the throttled function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the throttled function.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and throttler instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncThrottler instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async throttler\n * - Use `onSuccess` callback to react to successful function execution and implement custom logic\n * - Use `onError` callback to react to function execution errors and implement custom error handling\n * - Use `onSettled` callback to react to function execution completion (success or error) and implement custom logic\n * - The state includes error count, execution status, last execution time, and success/settle counts\n * - State can be accessed via the underlying AsyncThrottler instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * @example\n * ```ts\n * const throttled = asyncThrottle(async (value: string) => {\n *   const result = await saveToAPI(value);\n *   return result; // Return value is preserved\n * }, {\n *   wait: 1000,\n *   onError: (error) => {\n *     console.error('API call failed:', error);\n *   }\n * });\n *\n * // This will execute at most once per second\n * // Returns the API response directly\n * const result = await throttled(inputElement.value);\n * ```\n */\nexport function asyncThrottle<TFn extends AnyAsyncFunction>(\n  fn: TFn,\n  initialOptions: AsyncThrottlerOptions<TFn>,\n) {\n  const asyncThrottler = new AsyncThrottler(fn, initialOptions)\n  return asyncThrottler.maybeExecute\n}\n"],"names":["Store","parseFunctionOrValue"],"mappings":";;;;AA+CA,SAAS,gCAEqB;AAC5B,SAAO,gBAAgB;AAAA,IACrB,YAAY;AAAA,IACZ,aAAa;AAAA,IACb,WAAW;AAAA,IACX,UAAU;AAAA,IACV,mBAAmB;AAAA,IACnB,YAAY;AAAA,IACZ,mBAAmB;AAAA,IACnB,aAAa;AAAA,IACb,QAAQ;AAAA,IACR,cAAc;AAAA,EAAA,CACf;AACH;AA8DA,MAAM,iBAA6D;AAAA,EACjE,SAAS;AAAA,EACT,SAAS;AAAA,EACT,UAAU;AAAA,EACV,MAAM;AACR;AAkDO,MAAM,eAA6C;AAAA,EAWxD,YACU,IACR,gBACA;AAFQ,SAAA,KAAA;AAXV,SAAS,QAAmD,IAAIA,MAAAA,MAE9D,8BAAA,CAAoC;AAEtC,SAAA,mBAA2C;AAC3C,SAAA,aAAoC;AACpC,SAAA,0BAEW;AAiBX,SAAA,aAAa,CAAC,eAA0D;AACtE,WAAK,UAAU,EAAE,GAAG,KAAK,SAAS,GAAG,WAAA;AAGrC,UAAI,CAAC,KAAK,eAAe;AACvB,aAAK,OAAA;AAAA,MAAO;AAAA,IACd;AAGF,SAAA,YAAY,CAAC,aAAsD;AACjE,WAAK,MAAM,SAAS,CAAC,UAAU;AAC7B,cAAM,gBAAgB;AAAA,UACpB,GAAG;AAAA,UACH,GAAG;AAAA,QAAA;AAEL,cAAM,EAAE,WAAW,aAAa,YAAA,IAAgB;AAChD,eAAO;AAAA,UACL,GAAG;AAAA,UACH,QAAQ,CAAC,KAAK,YAAA,IACV,aACA,YACE,YACA,cACE,cACA,cAAc,IACZ,YACA;AAAA,QAAA;AAAA,MACZ,CACD;AAAA,IAAA;AAMH,SAAA,cAAc,MAAe;AAC3B,aAAO,CAAC,CAACC,MAAAA,qBAAqB,KAAK,QAAQ,SAAS,IAAI;AAAA,IAAA;AAM1D,SAAA,WAAW,MAAc;AACvB,aAAOA,MAAAA,qBAAqB,KAAK,QAAQ,MAAM,IAAI;AAAA,IAAA;AAyBrD,SAAA,eAAe,UACV,SACsC;AACzC,UAAI,CAAC,KAAK,YAAA,EAAe,QAAO;AAChC,YAAM,MAAM,KAAK,IAAA;AACjB,YAAM,yBAAyB,MAAM,KAAK,MAAM,MAAM;AACtD,YAAM,OAAO,KAAK,SAAA;AAElB,WAAK,UAAU,EAAE,UAAU,KAAA,CAAM;AAEjC,WAAK,gCAAA;AAGL,UAAI,KAAK,QAAQ,WAAW,0BAA0B,MAAM;AAC1D,cAAM,KAAK,SAAS,GAAG,IAAI;AAC3B,eAAO,KAAK,MAAM,MAAM;AAAA,MAAA,OACnB;AACL,eAAO,IAAI,QAAQ,CAAC,YAAY;AAC9B,eAAK,0BAA0B;AAE/B,eAAK,cAAA;AAGL,cAAI,KAAK,QAAQ,UAAU;AACzB,kBAAM,0BAA0B,KAAK,MAAM,MAAM,oBAC7C,MAAM,KAAK,MAAM,MAAM,oBACvB;AACJ,kBAAM,kBAAkB,OAAO;AAC/B,iBAAK,UAAU,EAAE,WAAW,KAAA,CAAM;AAClC,iBAAK,aAAa,WAAW,YAAY;AACvC,kBAAI,KAAK,MAAM,MAAM,aAAa,QAAW;AAC3C,sBAAM,KAAK,SAAS,GAAG,KAAK,MAAM,MAAM,QAAQ;AAAA,cAAA;AAElD,mBAAK,0BAA0B;AAC/B,sBAAQ,KAAK,MAAM,MAAM,UAAU;AAAA,YAAA,GAClC,eAAe;AAAA,UAAA;AAAA,QACpB,CACD;AAAA,MAAA;AAAA,IACH;AAGF,SAAA,WAAW,UACN,SACsC;AACzC,UAAI,CAAC,KAAK,iBAAiB,KAAK,MAAM,MAAM,YAAa,QAAO;AAChE,WAAK,mBAAmB,IAAI,gBAAA;AAC5B,UAAI;AACF,aAAK,UAAU,EAAE,aAAa,KAAA,CAAM;AACpC,cAAM,SAAS,MAAM,KAAK,GAAG,GAAG,IAAI;AACpC,aAAK,UAAU;AAAA,UACb,YAAY;AAAA,UACZ,cAAc,KAAK,MAAM,MAAM,eAAe;AAAA,QAAA,CAC/C;AACD,aAAK,QAAQ,YAAY,QAAQ,IAAI;AAAA,MAAA,SAC9B,OAAO;AACd,aAAK,UAAU;AAAA,UACb,YAAY,KAAK,MAAM,MAAM,aAAa;AAAA,QAAA,CAC3C;AACD,aAAK,QAAQ,UAAU,OAAO,IAAI;AAClC,YAAI,KAAK,QAAQ,cAAc;AAC7B,gBAAM;AAAA,QAAA,OACD;AACL,kBAAQ,MAAM,KAAK;AAAA,QAAA;AAAA,MACrB,UACF;AACE,cAAM,oBAAoB,KAAK,IAAA;AAC/B,cAAM,oBAAoB,oBAAoB,KAAK,SAAA;AACnD,aAAK,UAAU;AAAA,UACb,aAAa;AAAA,UACb,WAAW;AAAA,UACX,aAAa,KAAK,MAAM,MAAM,cAAc;AAAA,UAC5C;AAAA,UACA;AAAA,QAAA,CACD;AACD,aAAK,mBAAmB;AACxB,aAAK,QAAQ,YAAY,IAAI;AAAA,MAAA;AAE/B,aAAO,KAAK,MAAM,MAAM;AAAA,IAAA;AAM1B,SAAA,QAAQ,MAAY;AAClB,UAAI,KAAK,MAAM,MAAM,aAAa,KAAK,MAAM,MAAM,UAAU;AAC3D,aAAK,gBAAA;AACL,aAAK,cAAA;AACL,aAAK,SAAS,GAAG,KAAK,MAAM,MAAM,QAAQ;AAAA,MAAA;AAAA,IAC5C;AAGF,SAAA,kCAAkC,MAAY;AAC5C,UAAI,KAAK,yBAAyB;AAChC,aAAK,wBAAwB,KAAK,MAAM,MAAM,UAAU;AACxD,aAAK,0BAA0B;AAAA,MAAA;AAAA,IACjC;AAGF,SAAA,gBAAgB,MAAY;AAC1B,UAAI,KAAK,YAAY;AACnB,qBAAa,KAAK,UAAU;AAC5B,aAAK,aAAa;AAAA,MAAA;AAAA,IACpB;AAGF,SAAA,0BAA0B,MAAY;AACpC,WAAK,cAAA;AACL,UAAI,KAAK,yBAAyB;AAChC,aAAK,wBAAwB,KAAK,MAAM,MAAM,UAAU;AACxD,aAAK,0BAA0B;AAAA,MAAA;AAEjC,WAAK,UAAU;AAAA,QACb,WAAW;AAAA,QACX,aAAa;AAAA,QACb,UAAU;AAAA,MAAA,CACX;AAAA,IAAA;AAGH,SAAA,kBAAkB,MAAY;AAC5B,UAAI,KAAK,kBAAkB;AACzB,aAAK,iBAAiB,MAAA;AACtB,aAAK,mBAAmB;AAAA,MAAA;AAAA,IAC1B;AAMF,SAAA,SAAS,MAAY;AACnB,WAAK,wBAAA;AACL,WAAK,gBAAA;AAAA,IAAgB;AAMvB,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,+BAAoC;AAAA,IAAA;AAvNnD,SAAK,UAAU;AAAA,MACb,GAAG;AAAA,MACH,GAAG;AAAA,MACH,cAAc,eAAe,gBAAgB,CAAC,eAAe;AAAA,IAAA;AAE/D,SAAK,UAAU,KAAK,QAAQ,gBAAgB,CAAA,CAAE;AAAA,EAAA;AAAA,EAfhD;AAAA,EACA;AAAA,EACA;AAAA,EA4BA;AAAA,EAyBA;AAAA,EAOA;AAAA,EAmEA;AAAA,EAkDA;AAAA,EAOA;AAAA,EAOA;AAAA,EAaA;AAqBF;AA6CO,SAAS,cACd,IACA,gBACA;AACA,QAAM,iBAAiB,IAAI,eAAe,IAAI,cAAc;AAC5D,SAAO,eAAe;AACxB;;;"}
+{"version":3,"file":"async-throttler.cjs","sources":["../../src/async-throttler.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { AnyAsyncFunction, OptionalKeys } from './types'\n\nexport interface AsyncThrottlerState<TFn extends AnyAsyncFunction> {\n  /**\n   * Number of function executions that have resulted in errors\n   */\n  errorCount: number\n  /**\n   * Whether the throttled function is currently executing asynchronously\n   */\n  isExecuting: boolean\n  /**\n   * Whether the throttler is waiting for the timeout to trigger execution\n   */\n  isPending: boolean\n  /**\n   * The arguments from the most recent call to maybeExecute\n   */\n  lastArgs: Parameters<TFn> | undefined\n  /**\n   * Timestamp of the last function execution in milliseconds\n   */\n  lastExecutionTime: number\n  /**\n   * The result from the most recent successful function execution\n   */\n  lastResult: ReturnType<TFn> | undefined\n  /**\n   * Timestamp when the next execution can occur in milliseconds\n   */\n  nextExecutionTime: number\n  /**\n   * Number of function executions that have completed (either successfully or with errors)\n   */\n  settleCount: number\n  /**\n   * Current execution status - 'idle' when not active, 'pending' when waiting, 'executing' when running, 'settled' when completed\n   */\n  status: 'disabled' | 'idle' | 'pending' | 'executing' | 'settled'\n  /**\n   * Number of function executions that have completed successfully\n   */\n  successCount: number\n}\n\nfunction getDefaultAsyncThrottlerState<\n  TFn extends AnyAsyncFunction,\n>(): AsyncThrottlerState<TFn> {\n  return structuredClone({\n    errorCount: 0,\n    isExecuting: false,\n    isPending: false,\n    lastArgs: undefined,\n    lastExecutionTime: 0,\n    lastResult: undefined,\n    nextExecutionTime: 0,\n    settleCount: 0,\n    status: 'idle',\n    successCount: 0,\n  })\n}\n\n/**\n * Options for configuring an async throttled function\n */\nexport interface AsyncThrottlerOptions<TFn extends AnyAsyncFunction> {\n  /**\n   * Whether the throttler is enabled. When disabled, maybeExecute will not trigger any executions.\n   * Can be a boolean or a function that returns a boolean.\n   * Defaults to true.\n   */\n  enabled?: boolean | ((throttler: AsyncThrottler<TFn>) => boolean)\n  /**\n   * Initial state for the async throttler\n   */\n  initialState?: Partial<AsyncThrottlerState<TFn>>\n  /**\n   * Whether to execute the function immediately when called\n   * Defaults to true\n   */\n  leading?: boolean\n  /**\n   * Optional error handler for when the throttled function throws.\n   * If provided, the handler will be called with the error and throttler instance.\n   * This can be used alongside throwOnError - the handler will be called before any error is thrown.\n   */\n  onError?: (error: unknown, asyncThrottler: AsyncThrottler<TFn>) => void\n  /**\n   * Optional function to call when the throttled function is executed\n   */\n  onSettled?: (asyncThrottler: AsyncThrottler<TFn>) => void\n  /**\n   * Optional function to call when the throttled function is executed\n   */\n  onSuccess?: (\n    result: ReturnType<TFn>,\n    asyncThrottler: AsyncThrottler<TFn>,\n  ) => void\n  /**\n   * Whether to throw errors when they occur.\n   * Defaults to true if no onError handler is provided, false if an onError handler is provided.\n   * Can be explicitly set to override these defaults.\n   */\n  throwOnError?: boolean\n  /**\n   * Whether to execute the function on the trailing edge of the wait period\n   * Defaults to true\n   */\n  trailing?: boolean\n  /**\n   * Time window in milliseconds during which the function can only be executed once.\n   * Can be a number or a function that returns a number.\n   * Defaults to 0ms\n   */\n  wait: number | ((throttler: AsyncThrottler<TFn>) => number)\n}\n\ntype AsyncThrottlerOptionsWithOptionalCallbacks = OptionalKeys<\n  AsyncThrottlerOptions<any>,\n  'initialState' | 'onError' | 'onSettled' | 'onSuccess'\n>\n\nconst defaultOptions: AsyncThrottlerOptionsWithOptionalCallbacks = {\n  enabled: true,\n  leading: true,\n  trailing: true,\n  wait: 0,\n}\n\n/**\n * A class that creates an async throttled function.\n *\n * Throttling limits how often a function can be executed, allowing only one execution within a specified time window.\n * Unlike debouncing which resets the delay timer on each call, throttling ensures the function executes at a\n * regular interval regardless of how often it's called.\n *\n * Unlike the non-async Throttler, this async version supports returning values from the throttled function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the throttled function.\n *\n * This is useful for rate-limiting API calls, handling scroll/resize events, or any scenario where you want to\n * ensure a maximum execution frequency.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and throttler instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncThrottler instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async throttler\n * - Use `onSuccess` callback to react to successful function execution and implement custom logic\n * - Use `onError` callback to react to function execution errors and implement custom error handling\n * - Use `onSettled` callback to react to function execution completion (success or error) and implement custom logic\n * - The state includes error count, execution status, last execution time, and success/settle counts\n * - State can be accessed via `asyncThrottler.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `asyncThrottler.state`\n *\n * @example\n * ```ts\n * const throttler = new AsyncThrottler(async (value: string) => {\n *   const result = await saveToAPI(value);\n *   return result; // Return value is preserved\n * }, {\n *   wait: 1000,\n *   onError: (error) => {\n *     console.error('API call failed:', error);\n *   }\n * });\n *\n * // Will only execute once per second no matter how often called\n * // Returns the API response directly\n * const result = await throttler.maybeExecute(inputElement.value);\n * ```\n */\nexport class AsyncThrottler<TFn extends AnyAsyncFunction> {\n  readonly store: Store<Readonly<AsyncThrottlerState<TFn>>> = new Store<\n    AsyncThrottlerState<TFn>\n  >(getDefaultAsyncThrottlerState<TFn>())\n  options: AsyncThrottlerOptions<TFn>\n  #abortController: AbortController | null = null\n  #timeoutId: NodeJS.Timeout | null = null\n  #resolvePreviousPromise:\n    | ((value?: ReturnType<TFn> | undefined) => void)\n    | null = null\n  #rejectPreviousPromise: ((reason?: unknown) => void) | null = null\n\n  constructor(\n    private fn: TFn,\n    initialOptions: AsyncThrottlerOptions<TFn>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n      throwOnError: initialOptions.throwOnError ?? !initialOptions.onError,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the async throttler options\n   */\n  setOptions = (newOptions: Partial<AsyncThrottlerOptions<TFn>>): void => {\n    this.options = { ...this.options, ...newOptions }\n\n    // End the pending state if the throttler is disabled\n    if (!this.#getEnabled()) {\n      this.cancel()\n    }\n  }\n\n  #setState = (newState: Partial<AsyncThrottlerState<TFn>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const { isPending, isExecuting, settleCount } = combinedState\n      return {\n        ...combinedState,\n        status: !this.#getEnabled()\n          ? 'disabled'\n          : isPending\n            ? 'pending'\n            : isExecuting\n              ? 'executing'\n              : settleCount > 0\n                ? 'settled'\n                : 'idle',\n      }\n    })\n  }\n\n  /**\n   * Returns the current enabled state of the async throttler\n   */\n  #getEnabled = (): boolean => {\n    return !!parseFunctionOrValue(this.options.enabled, this)\n  }\n\n  /**\n   * Returns the current wait time in milliseconds\n   */\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait, this)\n  }\n\n  /**\n   * Attempts to execute the throttled function. The execution behavior depends on the throttler options:\n   *\n   * - If enough time has passed since the last execution (>= wait period):\n   *   - With leading=true: Executes immediately\n   *   - With leading=false: Waits for the next trailing execution\n   *\n   * - If within the wait period:\n   *   - With trailing=true: Schedules execution for end of wait period\n   *   - With trailing=false: Drops the execution\n   *\n   * @example\n   * ```ts\n   * const throttled = new AsyncThrottler(fn, { wait: 1000 });\n   *\n   * // First call executes immediately\n   * await throttled.maybeExecute('a', 'b');\n   *\n   * // Call during wait period - gets throttled\n   * await throttled.maybeExecute('c', 'd');\n   * ```\n   */\n  maybeExecute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    if (!this.#getEnabled()) return undefined\n    const now = Date.now()\n    const timeSinceLastExecution = now - this.store.state.lastExecutionTime\n    const wait = this.#getWait()\n    // Store the most recent arguments for potential trailing execution\n    this.#setState({ lastArgs: args })\n\n    this.#resolvePreviousPromiseInternal()\n\n    // Handle leading execution\n    if (this.options.leading && timeSinceLastExecution >= wait) {\n      await this.#execute(...args)\n      return this.store.state.lastResult\n    } else {\n      return new Promise((resolve, reject) => {\n        this.#resolvePreviousPromise = resolve\n        this.#rejectPreviousPromise = reject\n        // Clear any existing timeout to ensure we use the latest arguments\n        this.#clearTimeout()\n\n        // Set up trailing execution if enabled\n        if (this.options.trailing) {\n          const _timeSinceLastExecution = this.store.state.lastExecutionTime\n            ? now - this.store.state.lastExecutionTime\n            : 0\n          const timeoutDuration = wait - _timeSinceLastExecution\n          this.#setState({ isPending: true })\n          this.#timeoutId = setTimeout(async () => {\n            if (this.store.state.lastArgs !== undefined) {\n              await this.#execute(...this.store.state.lastArgs)\n            }\n            this.#resolvePreviousPromise = null\n            resolve(this.store.state.lastResult)\n          }, timeoutDuration)\n        }\n      })\n    }\n  }\n\n  #execute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    if (!this.#getEnabled() || this.store.state.isExecuting) return undefined\n    this.#abortController = new AbortController()\n    try {\n      this.#setState({ isExecuting: true })\n      const result = await this.fn(...args) // EXECUTE!\n      this.#setState({\n        lastResult: result,\n        successCount: this.store.state.successCount + 1,\n      })\n      this.options.onSuccess?.(result, this)\n    } catch (error) {\n      this.#setState({\n        errorCount: this.store.state.errorCount + 1,\n      })\n      this.options.onError?.(error, this)\n      if (this.options.throwOnError) {\n        this.#rejectPreviousPromiseInternal(error)\n      }\n    } finally {\n      const lastExecutionTime = Date.now()\n      const nextExecutionTime = lastExecutionTime + this.#getWait()\n      this.#setState({\n        isExecuting: false,\n        isPending: false,\n        settleCount: this.store.state.settleCount + 1,\n        lastExecutionTime,\n        nextExecutionTime,\n      })\n      this.#abortController = null\n      this.options.onSettled?.(this)\n    }\n    return this.store.state.lastResult\n  }\n\n  /**\n   * Processes the current pending execution immediately\n   */\n  flush = async (): Promise<ReturnType<TFn> | undefined> => {\n    if (this.store.state.isPending && this.store.state.lastArgs) {\n      this.#abortExecution() // abort any current execution\n      this.#clearTimeout() // clear any existing timeout\n      const result = await this.#execute(...this.store.state.lastArgs)\n\n      // Resolve any pending promise from maybeExecute\n      this.#resolvePreviousPromiseInternal()\n\n      return result\n    }\n    return undefined\n  }\n\n  #resolvePreviousPromiseInternal = (): void => {\n    if (this.#resolvePreviousPromise) {\n      this.#resolvePreviousPromise(this.store.state.lastResult)\n      this.#resolvePreviousPromise = null\n    }\n  }\n\n  #rejectPreviousPromiseInternal = (error: unknown): void => {\n    if (this.#rejectPreviousPromise) {\n      this.#rejectPreviousPromise(error)\n      this.#rejectPreviousPromise = null\n    }\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = null\n    }\n  }\n\n  #cancelPendingExecution = (): void => {\n    this.#clearTimeout()\n    if (this.#resolvePreviousPromise) {\n      this.#resolvePreviousPromise(this.store.state.lastResult)\n      this.#resolvePreviousPromise = null\n    }\n    this.#setState({\n      isPending: false,\n      isExecuting: false,\n      lastArgs: undefined,\n    })\n  }\n\n  #abortExecution = (): void => {\n    if (this.#abortController) {\n      this.#abortController.abort()\n      this.#abortController = null\n    }\n  }\n\n  /**\n   * Cancels any pending execution or aborts any execution in progress\n   */\n  cancel = (): void => {\n    this.#cancelPendingExecution()\n    this.#abortExecution()\n  }\n\n  /**\n   * Resets the debouncer state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultAsyncThrottlerState<TFn>())\n  }\n}\n\n/**\n * Creates an async throttled function that limits how often the function can execute.\n * The throttled function will execute at most once per wait period, even if called multiple times.\n * If called while executing, it will wait until execution completes before scheduling the next call.\n *\n * Unlike the non-async Throttler, this async version supports returning values from the throttled function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the throttled function.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and throttler instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncThrottler instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async throttler\n * - Use `onSuccess` callback to react to successful function execution and implement custom logic\n * - Use `onError` callback to react to function execution errors and implement custom error handling\n * - Use `onSettled` callback to react to function execution completion (success or error) and implement custom logic\n * - The state includes error count, execution status, last execution time, and success/settle counts\n * - State can be accessed via the underlying AsyncThrottler instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * @example\n * ```ts\n * const throttled = asyncThrottle(async (value: string) => {\n *   const result = await saveToAPI(value);\n *   return result; // Return value is preserved\n * }, {\n *   wait: 1000,\n *   onError: (error) => {\n *     console.error('API call failed:', error);\n *   }\n * });\n *\n * // This will execute at most once per second\n * // Returns the API response directly\n * const result = await throttled(inputElement.value);\n * ```\n */\nexport function asyncThrottle<TFn extends AnyAsyncFunction>(\n  fn: TFn,\n  initialOptions: AsyncThrottlerOptions<TFn>,\n) {\n  const asyncThrottler = new AsyncThrottler(fn, initialOptions)\n  return asyncThrottler.maybeExecute\n}\n"],"names":["Store","parseFunctionOrValue"],"mappings":";;;;AA+CA,SAAS,gCAEqB;AAC5B,SAAO,gBAAgB;AAAA,IACrB,YAAY;AAAA,IACZ,aAAa;AAAA,IACb,WAAW;AAAA,IACX,UAAU;AAAA,IACV,mBAAmB;AAAA,IACnB,YAAY;AAAA,IACZ,mBAAmB;AAAA,IACnB,aAAa;AAAA,IACb,QAAQ;AAAA,IACR,cAAc;AAAA,EAAA,CACf;AACH;AA8DA,MAAM,iBAA6D;AAAA,EACjE,SAAS;AAAA,EACT,SAAS;AAAA,EACT,UAAU;AAAA,EACV,MAAM;AACR;AAkDO,MAAM,eAA6C;AAAA,EAYxD,YACU,IACR,gBACA;AAFQ,SAAA,KAAA;AAZV,SAAS,QAAmD,IAAIA,MAAAA,MAE9D,8BAAA,CAAoC;AAEtC,SAAA,mBAA2C;AAC3C,SAAA,aAAoC;AACpC,SAAA,0BAEW;AACX,SAAA,yBAA8D;AAiB9D,SAAA,aAAa,CAAC,eAA0D;AACtE,WAAK,UAAU,EAAE,GAAG,KAAK,SAAS,GAAG,WAAA;AAGrC,UAAI,CAAC,KAAK,eAAe;AACvB,aAAK,OAAA;AAAA,MAAO;AAAA,IACd;AAGF,SAAA,YAAY,CAAC,aAAsD;AACjE,WAAK,MAAM,SAAS,CAAC,UAAU;AAC7B,cAAM,gBAAgB;AAAA,UACpB,GAAG;AAAA,UACH,GAAG;AAAA,QAAA;AAEL,cAAM,EAAE,WAAW,aAAa,YAAA,IAAgB;AAChD,eAAO;AAAA,UACL,GAAG;AAAA,UACH,QAAQ,CAAC,KAAK,YAAA,IACV,aACA,YACE,YACA,cACE,cACA,cAAc,IACZ,YACA;AAAA,QAAA;AAAA,MACZ,CACD;AAAA,IAAA;AAMH,SAAA,cAAc,MAAe;AAC3B,aAAO,CAAC,CAACC,MAAAA,qBAAqB,KAAK,QAAQ,SAAS,IAAI;AAAA,IAAA;AAM1D,SAAA,WAAW,MAAc;AACvB,aAAOA,MAAAA,qBAAqB,KAAK,QAAQ,MAAM,IAAI;AAAA,IAAA;AAyBrD,SAAA,eAAe,UACV,SACsC;AACzC,UAAI,CAAC,KAAK,YAAA,EAAe,QAAO;AAChC,YAAM,MAAM,KAAK,IAAA;AACjB,YAAM,yBAAyB,MAAM,KAAK,MAAM,MAAM;AACtD,YAAM,OAAO,KAAK,SAAA;AAElB,WAAK,UAAU,EAAE,UAAU,KAAA,CAAM;AAEjC,WAAK,gCAAA;AAGL,UAAI,KAAK,QAAQ,WAAW,0BAA0B,MAAM;AAC1D,cAAM,KAAK,SAAS,GAAG,IAAI;AAC3B,eAAO,KAAK,MAAM,MAAM;AAAA,MAAA,OACnB;AACL,eAAO,IAAI,QAAQ,CAAC,SAAS,WAAW;AACtC,eAAK,0BAA0B;AAC/B,eAAK,yBAAyB;AAE9B,eAAK,cAAA;AAGL,cAAI,KAAK,QAAQ,UAAU;AACzB,kBAAM,0BAA0B,KAAK,MAAM,MAAM,oBAC7C,MAAM,KAAK,MAAM,MAAM,oBACvB;AACJ,kBAAM,kBAAkB,OAAO;AAC/B,iBAAK,UAAU,EAAE,WAAW,KAAA,CAAM;AAClC,iBAAK,aAAa,WAAW,YAAY;AACvC,kBAAI,KAAK,MAAM,MAAM,aAAa,QAAW;AAC3C,sBAAM,KAAK,SAAS,GAAG,KAAK,MAAM,MAAM,QAAQ;AAAA,cAAA;AAElD,mBAAK,0BAA0B;AAC/B,sBAAQ,KAAK,MAAM,MAAM,UAAU;AAAA,YAAA,GAClC,eAAe;AAAA,UAAA;AAAA,QACpB,CACD;AAAA,MAAA;AAAA,IACH;AAGF,SAAA,WAAW,UACN,SACsC;AACzC,UAAI,CAAC,KAAK,iBAAiB,KAAK,MAAM,MAAM,YAAa,QAAO;AAChE,WAAK,mBAAmB,IAAI,gBAAA;AAC5B,UAAI;AACF,aAAK,UAAU,EAAE,aAAa,KAAA,CAAM;AACpC,cAAM,SAAS,MAAM,KAAK,GAAG,GAAG,IAAI;AACpC,aAAK,UAAU;AAAA,UACb,YAAY;AAAA,UACZ,cAAc,KAAK,MAAM,MAAM,eAAe;AAAA,QAAA,CAC/C;AACD,aAAK,QAAQ,YAAY,QAAQ,IAAI;AAAA,MAAA,SAC9B,OAAO;AACd,aAAK,UAAU;AAAA,UACb,YAAY,KAAK,MAAM,MAAM,aAAa;AAAA,QAAA,CAC3C;AACD,aAAK,QAAQ,UAAU,OAAO,IAAI;AAClC,YAAI,KAAK,QAAQ,cAAc;AAC7B,eAAK,+BAA+B,KAAK;AAAA,QAAA;AAAA,MAC3C,UACF;AACE,cAAM,oBAAoB,KAAK,IAAA;AAC/B,cAAM,oBAAoB,oBAAoB,KAAK,SAAA;AACnD,aAAK,UAAU;AAAA,UACb,aAAa;AAAA,UACb,WAAW;AAAA,UACX,aAAa,KAAK,MAAM,MAAM,cAAc;AAAA,UAC5C;AAAA,UACA;AAAA,QAAA,CACD;AACD,aAAK,mBAAmB;AACxB,aAAK,QAAQ,YAAY,IAAI;AAAA,MAAA;AAE/B,aAAO,KAAK,MAAM,MAAM;AAAA,IAAA;AAM1B,SAAA,QAAQ,YAAkD;AACxD,UAAI,KAAK,MAAM,MAAM,aAAa,KAAK,MAAM,MAAM,UAAU;AAC3D,aAAK,gBAAA;AACL,aAAK,cAAA;AACL,cAAM,SAAS,MAAM,KAAK,SAAS,GAAG,KAAK,MAAM,MAAM,QAAQ;AAG/D,aAAK,gCAAA;AAEL,eAAO;AAAA,MAAA;AAET,aAAO;AAAA,IAAA;AAGT,SAAA,kCAAkC,MAAY;AAC5C,UAAI,KAAK,yBAAyB;AAChC,aAAK,wBAAwB,KAAK,MAAM,MAAM,UAAU;AACxD,aAAK,0BAA0B;AAAA,MAAA;AAAA,IACjC;AAGF,SAAA,iCAAiC,CAAC,UAAyB;AACzD,UAAI,KAAK,wBAAwB;AAC/B,aAAK,uBAAuB,KAAK;AACjC,aAAK,yBAAyB;AAAA,MAAA;AAAA,IAChC;AAGF,SAAA,gBAAgB,MAAY;AAC1B,UAAI,KAAK,YAAY;AACnB,qBAAa,KAAK,UAAU;AAC5B,aAAK,aAAa;AAAA,MAAA;AAAA,IACpB;AAGF,SAAA,0BAA0B,MAAY;AACpC,WAAK,cAAA;AACL,UAAI,KAAK,yBAAyB;AAChC,aAAK,wBAAwB,KAAK,MAAM,MAAM,UAAU;AACxD,aAAK,0BAA0B;AAAA,MAAA;AAEjC,WAAK,UAAU;AAAA,QACb,WAAW;AAAA,QACX,aAAa;AAAA,QACb,UAAU;AAAA,MAAA,CACX;AAAA,IAAA;AAGH,SAAA,kBAAkB,MAAY;AAC5B,UAAI,KAAK,kBAAkB;AACzB,aAAK,iBAAiB,MAAA;AACtB,aAAK,mBAAmB;AAAA,MAAA;AAAA,IAC1B;AAMF,SAAA,SAAS,MAAY;AACnB,WAAK,wBAAA;AACL,WAAK,gBAAA;AAAA,IAAgB;AAMvB,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,+BAAoC;AAAA,IAAA;AAnOnD,SAAK,UAAU;AAAA,MACb,GAAG;AAAA,MACH,GAAG;AAAA,MACH,cAAc,eAAe,gBAAgB,CAAC,eAAe;AAAA,IAAA;AAE/D,SAAK,UAAU,KAAK,QAAQ,gBAAgB,CAAA,CAAE;AAAA,EAAA;AAAA,EAhBhD;AAAA,EACA;AAAA,EACA;AAAA,EAGA;AAAA,EA0BA;AAAA,EAyBA;AAAA,EAOA;AAAA,EAoEA;AAAA,EAsDA;AAAA,EAOA;AAAA,EAOA;AAAA,EAOA;AAAA,EAaA;AAqBF;AA6CO,SAAS,cACd,IACA,gBACA;AACA,QAAM,iBAAiB,IAAI,eAAe,IAAI,cAAc;AAC5D,SAAO,eAAe;AACxB;;;"}

dist/cjs/async-throttler.d.cts

@@ -180,3 +180,3 @@ import { Store } from '@tanstack/store';
      */
-    flush: () => void;
+    flush: () => Promise<ReturnType<TFn> | undefined>;
     /**
@@ -183,0 +183,0 @@ * Cancels any pending execution or aborts any execution in progress

dist/cjs/batcher.cjs

@@ -10,3 +10,2 @@ "use strict";
     isPending: false,
-    isRunning: true,
     totalItemsProcessed: 0,
@@ -63,3 +62,3 @@ items: [],
         this.#execute();
-      } else if (this.store.state.isRunning && this.options.wait !== Infinity) {
+      } else if (this.options.wait !== Infinity) {
         this.#clearTimeout();
@@ -87,12 +86,2 @@ this.#timeoutId = setTimeout(() => this.#execute(), this.#getWait());
     };
-    this.stop = () => {
-      this.#setState({ isRunning: false });
-      this.#clearTimeout();
-    };
-    this.start = () => {
-      this.#setState({ isRunning: true });
-      if (this.store.state.items.length > 0) {
-        this.#execute();
-      }
-    };
     this.peekAllItems = () => {
@@ -99,0 +88,0 @@ return [...this.store.state.items];

dist/cjs/batcher.cjs.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"batcher.cjs","sources":["../../src/batcher.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { OptionalKeys } from './types'\n\nexport interface BatcherState<TValue> {\n  /**\n   * Number of batch executions that have been completed\n   */\n  executionCount: number\n  /**\n   * Whether the batcher has no items to process (items array is empty)\n   */\n  isEmpty: boolean\n  /**\n   * Whether the batcher is waiting for the timeout to trigger batch processing\n   */\n  isPending: boolean\n  /**\n   * Whether the batcher is active and will process items automatically\n   */\n  isRunning: boolean\n  /**\n   * Total number of items that have been processed across all batches\n   */\n  totalItemsProcessed: number\n  /**\n   * Array of items currently queued for batch processing\n   */\n  items: Array<TValue>\n  /**\n   * Number of items currently in the batch queue\n   */\n  size: number\n  /**\n   * Current processing status - 'idle' when not processing, 'pending' when waiting for timeout\n   */\n  status: 'idle' | 'pending'\n}\n\nfunction getDefaultBatcherState<TValue>(): BatcherState<TValue> {\n  return {\n    executionCount: 0,\n    isEmpty: true,\n    isPending: false,\n    isRunning: true,\n    totalItemsProcessed: 0,\n    items: [],\n    size: 0,\n    status: 'idle',\n  }\n}\n\n/**\n * Options for configuring a Batcher instance\n */\nexport interface BatcherOptions<TValue> {\n  /**\n   * Custom function to determine if a batch should be processed\n   * Return true to process the batch immediately\n   */\n  getShouldExecute?: (items: Array<TValue>, batcher: Batcher<TValue>) => boolean\n  /**\n   * Initial state for the batcher\n   */\n  initialState?: Partial<BatcherState<TValue>>\n  /**\n   * Maximum number of items in a batch\n   * @default Infinity\n   */\n  maxSize?: number\n  /**\n   * Callback fired after a batch is processed\n   */\n  onExecute?: (batcher: Batcher<TValue>) => void\n  /**\n   * Callback fired after items are added to the batcher\n   */\n  onItemsChange?: (batcher: Batcher<TValue>) => void\n  /**\n   * Whether the batcher should start processing immediately\n   * @default true\n   */\n  started?: boolean\n  /**\n   * Maximum time in milliseconds to wait before processing a batch.\n   * If the wait duration has elapsed, the batch will be processed.\n   * If not provided, the batch will not be triggered by a timeout.\n   * @default Infinity\n   */\n  wait?: number | ((batcher: Batcher<TValue>) => number)\n}\n\ntype BatcherOptionsWithOptionalCallbacks<TValue> = OptionalKeys<\n  Required<BatcherOptions<TValue>>,\n  'initialState' | 'onExecute' | 'onItemsChange'\n>\n\nconst defaultOptions: BatcherOptionsWithOptionalCallbacks<any> = {\n  getShouldExecute: () => false,\n  maxSize: Infinity,\n  started: true,\n  wait: Infinity,\n}\n\n/**\n * A class that collects items and processes them in batches.\n *\n * Batching is a technique for grouping multiple operations together to be processed as a single unit.\n *\n * The Batcher provides a flexible way to implement batching with configurable:\n * - Maximum batch size (number of items per batch)\n * - Time-based batching (process after X milliseconds)\n * - Custom batch processing logic via getShouldExecute\n * - Event callbacks for monitoring batch operations\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the batcher\n * - Use `onExecute` callback to react to batch execution and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the batcher\n * - The state includes batch execution count, total items processed, items, and running status\n * - State can be accessed via `batcher.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `batcher.state`\n *\n * @example\n * ```ts\n * const batcher = new Batcher<number>(\n *   (items) => console.log('Processing batch:', items),\n *   {\n *     maxSize: 5,\n *     wait: 2000,\n *     onExecute: (batcher) => console.log('Batch executed:', batcher.peekAllItems())\n *   }\n * );\n *\n * batcher.addItem(1);\n * batcher.addItem(2);\n * // After 2 seconds or when 5 items are added, whichever comes first,\n * // the batch will be processed\n * // batcher.flush() // manually trigger a batch\n * ```\n */\nexport class Batcher<TValue> {\n  readonly store: Store<Readonly<BatcherState<TValue>>> = new Store(\n    getDefaultBatcherState<TValue>(),\n  )\n  options: BatcherOptionsWithOptionalCallbacks<TValue>\n  #timeoutId: NodeJS.Timeout | null = null\n\n  constructor(\n    private fn: (items: Array<TValue>) => void,\n    initialOptions: BatcherOptions<TValue>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the batcher options\n   */\n  setOptions = (newOptions: Partial<BatcherOptions<TValue>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<BatcherState<TValue>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const { isPending, items } = combinedState\n      const size = items.length\n      const isEmpty = size === 0\n      return {\n        ...combinedState,\n        isEmpty,\n        size,\n        status: isPending ? 'pending' : 'idle',\n      }\n    })\n  }\n\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait, this)\n  }\n\n  /**\n   * Adds an item to the batcher\n   * If the batch size is reached, timeout occurs, or shouldProcess returns true, the batch will be processed\n   */\n  addItem = (item: TValue): void => {\n    this.#setState({\n      items: [...this.store.state.items, item],\n      isPending: this.options.wait !== Infinity,\n    })\n    this.options.onItemsChange?.(this)\n\n    const shouldProcess =\n      this.store.state.items.length >= this.options.maxSize ||\n      this.options.getShouldExecute(this.store.state.items, this)\n\n    if (shouldProcess) {\n      this.#execute()\n    } else if (this.store.state.isRunning && this.options.wait !== Infinity) {\n      this.#clearTimeout() // clear any pending timeout to replace it with a new one\n      this.#timeoutId = setTimeout(() => this.#execute(), this.#getWait())\n    }\n  }\n\n  /**\n   * Processes the current batch of items.\n   * This method will automatically be triggered if the batcher is running and any of these conditions are met:\n   * - The number of items reaches batchSize\n   * - The wait duration has elapsed\n   * - The getShouldExecute function returns true upon adding an item\n   *\n   * You can also call this method manually to process the current batch at any time.\n   */\n  #execute = (): void => {\n    if (this.store.state.items.length === 0) {\n      return\n    }\n\n    const batch = this.peekAllItems() // copy of the items to be processed (to prevent race conditions)\n    this.clear() // Clear items before processing to prevent race conditions\n    this.options.onItemsChange?.(this) // Call onItemsChange to notify listeners that the items have changed\n\n    this.fn(batch) // EXECUTE\n    this.#setState({\n      executionCount: this.store.state.executionCount + 1,\n      totalItemsProcessed: this.store.state.totalItemsProcessed + batch.length,\n    })\n    this.options.onExecute?.(this)\n  }\n\n  /**\n   * Processes the current batch of items immediately\n   */\n  flush = (): void => {\n    this.#clearTimeout() // clear any pending timeout\n    this.#execute() // execute immediately\n  }\n\n  /**\n   * Stops the batcher from processing batches\n   */\n  stop = (): void => {\n    this.#setState({ isRunning: false })\n    this.#clearTimeout()\n  }\n\n  /**\n   * Starts the batcher and processes any pending items\n   */\n  start = (): void => {\n    this.#setState({ isRunning: true })\n    if (this.store.state.items.length > 0) {\n      this.#execute()\n    }\n  }\n\n  /**\n   * Returns a copy of all items in the batcher\n   */\n  peekAllItems = (): Array<TValue> => {\n    return [...this.store.state.items]\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = null\n    }\n  }\n\n  /**\n   * Removes all items from the batcher\n   */\n  clear = (): void => {\n    this.#setState({ items: [], isPending: false })\n  }\n\n  /**\n   * Resets the batcher state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultBatcherState<TValue>())\n    this.options.onItemsChange?.(this)\n  }\n}\n\n/**\n * Creates a batcher that processes items in batches\n *\n * @example\n * ```ts\n * const batchItems = batch<number>(\n *   (items) => console.log('Processing:', items),\n *   {\n *     maxSize: 3,\n *     onExecute: (batcher) => console.log('Batch executed')\n *   }\n * );\n *\n * batchItems(1);\n * batchItems(2);\n * batchItems(3); 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+{"version":3,"file":"batcher.cjs","sources":["../../src/batcher.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { OptionalKeys } from './types'\n\nexport interface BatcherState<TValue> {\n  /**\n   * Number of batch executions that have been completed\n   */\n  executionCount: number\n  /**\n   * Whether the batcher has no items to process (items array is empty)\n   */\n  isEmpty: boolean\n  /**\n   * Whether the batcher is waiting for the timeout to trigger batch processing\n   */\n  isPending: boolean\n  /**\n   * Array of items currently queued for batch processing\n   */\n  items: Array<TValue>\n  /**\n   * Number of items currently in the batch queue\n   */\n  size: number\n  /**\n   * Current processing status - 'idle' when not processing, 'pending' when waiting for timeout\n   */\n  status: 'idle' | 'pending'\n  /**\n   * Total number of items that have been processed across all batches\n   */\n  totalItemsProcessed: number\n}\n\nfunction getDefaultBatcherState<TValue>(): BatcherState<TValue> {\n  return {\n    executionCount: 0,\n    isEmpty: true,\n    isPending: false,\n    totalItemsProcessed: 0,\n    items: [],\n    size: 0,\n    status: 'idle',\n  }\n}\n\n/**\n * Options for configuring a Batcher instance\n */\nexport interface BatcherOptions<TValue> {\n  /**\n   * Custom function to determine if a batch should be processed\n   * Return true to process the batch immediately\n   */\n  getShouldExecute?: (items: Array<TValue>, batcher: Batcher<TValue>) => boolean\n  /**\n   * Initial state for the batcher\n   */\n  initialState?: Partial<BatcherState<TValue>>\n  /**\n   * Maximum number of items in a batch\n   * @default Infinity\n   */\n  maxSize?: number\n  /**\n   * Callback fired after a batch is processed\n   */\n  onExecute?: (batcher: Batcher<TValue>) => void\n  /**\n   * Callback fired after items are added to the batcher\n   */\n  onItemsChange?: (batcher: Batcher<TValue>) => void\n  /**\n   * Whether the batcher should start processing immediately\n   * @default true\n   */\n  started?: boolean\n  /**\n   * Maximum time in milliseconds to wait before processing a batch.\n   * If the wait duration has elapsed, the batch will be processed.\n   * If not provided, the batch will not be triggered by a timeout.\n   * @default Infinity\n   */\n  wait?: number | ((batcher: Batcher<TValue>) => number)\n}\n\ntype BatcherOptionsWithOptionalCallbacks<TValue> = OptionalKeys<\n  Required<BatcherOptions<TValue>>,\n  'initialState' | 'onExecute' | 'onItemsChange'\n>\n\nconst defaultOptions: BatcherOptionsWithOptionalCallbacks<any> = {\n  getShouldExecute: () => false,\n  maxSize: Infinity,\n  started: true,\n  wait: Infinity,\n}\n\n/**\n * A class that collects items and processes them in batches.\n *\n * Batching is a technique for grouping multiple operations together to be processed as a single unit.\n *\n * The Batcher provides a flexible way to implement batching with configurable:\n * - Maximum batch size (number of items per batch)\n * - Time-based batching (process after X milliseconds)\n * - Custom batch processing logic via getShouldExecute\n * - Event callbacks for monitoring batch operations\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the batcher\n * - Use `onExecute` callback to react to batch execution and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the batcher\n * - The state includes batch execution count, total items processed, items, and running status\n * - State can be accessed via `batcher.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `batcher.state`\n *\n * @example\n * ```ts\n * const batcher = new Batcher<number>(\n *   (items) => console.log('Processing batch:', items),\n *   {\n *     maxSize: 5,\n *     wait: 2000,\n *     onExecute: (batcher) => console.log('Batch executed:', batcher.peekAllItems())\n *   }\n * );\n *\n * batcher.addItem(1);\n * batcher.addItem(2);\n * // After 2 seconds or when 5 items are added, whichever comes first,\n * // the batch will be processed\n * // batcher.flush() // manually trigger a batch\n * ```\n */\nexport class Batcher<TValue> {\n  readonly store: Store<Readonly<BatcherState<TValue>>> = new Store(\n    getDefaultBatcherState<TValue>(),\n  )\n  options: BatcherOptionsWithOptionalCallbacks<TValue>\n  #timeoutId: NodeJS.Timeout | null = null\n\n  constructor(\n    private fn: (items: Array<TValue>) => void,\n    initialOptions: BatcherOptions<TValue>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the batcher options\n   */\n  setOptions = (newOptions: Partial<BatcherOptions<TValue>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<BatcherState<TValue>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const { isPending, items } = combinedState\n      const size = items.length\n      const isEmpty = size === 0\n      return {\n        ...combinedState,\n        isEmpty,\n        size,\n        status: isPending ? 'pending' : 'idle',\n      }\n    })\n  }\n\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait, this)\n  }\n\n  /**\n   * Adds an item to the batcher\n   * If the batch size is reached, timeout occurs, or shouldProcess returns true, the batch will be processed\n   */\n  addItem = (item: TValue): void => {\n    this.#setState({\n      items: [...this.store.state.items, item],\n      isPending: this.options.wait !== Infinity,\n    })\n    this.options.onItemsChange?.(this)\n\n    const shouldProcess =\n      this.store.state.items.length >= this.options.maxSize ||\n      this.options.getShouldExecute(this.store.state.items, this)\n\n    if (shouldProcess) {\n      this.#execute()\n    } else if (this.options.wait !== Infinity) {\n      this.#clearTimeout() // clear any pending timeout to replace it with a new one\n      this.#timeoutId = setTimeout(() => this.#execute(), this.#getWait())\n    }\n  }\n\n  /**\n   * Processes the current batch of items.\n   * This method will automatically be triggered if the batcher is running and any of these conditions are met:\n   * - The number of items reaches batchSize\n   * - The wait duration has elapsed\n   * - The getShouldExecute function returns true upon adding an item\n   *\n   * You can also call this method manually to process the current batch at any time.\n   */\n  #execute = (): void => {\n    if (this.store.state.items.length === 0) {\n      return\n    }\n\n    const batch = this.peekAllItems() // copy of the items to be processed (to prevent race conditions)\n    this.clear() // Clear items before processing to prevent race conditions\n    this.options.onItemsChange?.(this) // Call onItemsChange to notify listeners that the items have changed\n\n    this.fn(batch) // EXECUTE\n    this.#setState({\n      executionCount: this.store.state.executionCount + 1,\n      totalItemsProcessed: this.store.state.totalItemsProcessed + batch.length,\n    })\n    this.options.onExecute?.(this)\n  }\n\n  /**\n   * Processes the current batch of items immediately\n   */\n  flush = (): void => {\n    this.#clearTimeout() // clear any pending timeout\n    this.#execute() // execute immediately\n  }\n\n  /**\n   * Returns a copy of all items in the batcher\n   */\n  peekAllItems = (): Array<TValue> => {\n    return [...this.store.state.items]\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = null\n    }\n  }\n\n  /**\n   * Removes all items from the batcher\n   */\n  clear = (): void => {\n    this.#setState({ items: [], isPending: false })\n  }\n\n  /**\n   * Resets the batcher state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultBatcherState<TValue>())\n    this.options.onItemsChange?.(this)\n  }\n}\n\n/**\n * Creates a batcher that processes items in batches\n *\n * @example\n * ```ts\n * const batchItems = batch<number>(\n *   (items) => console.log('Processing:', items),\n *   {\n *     maxSize: 3,\n *     onExecute: (batcher) => console.log('Batch executed')\n *   }\n * );\n *\n * batchItems(1);\n * batchItems(2);\n * batchItems(3); // Triggers batch processing\n * ```\n */\nexport function batch<TValue>(\n  fn: (items: Array<TValue>) => void,\n  options: BatcherOptions<TValue>,\n) {\n  const batcher = new Batcher<TValue>(fn, options)\n  return batcher.addItem\n}\n"],"names":["Store","parseFunctionOrValue","batch"],"mappings":";;;;AAmCA,SAAS,yBAAuD;AAC9D,SAAO;AAAA,IACL,gBAAgB;AAAA,IAChB,SAAS;AAAA,IACT,WAAW;AAAA,IACX,qBAAqB;AAAA,IACrB,OAAO,CAAA;AAAA,IACP,MAAM;AAAA,IACN,QAAQ;AAAA,EAAA;AAEZ;AA+CA,MAAM,iBAA2D;AAAA,EAC/D,kBAAkB,MAAM;AAAA,EACxB,SAAS;AAAA,EACT,SAAS;AAAA,EACT,MAAM;AACR;AAwCO,MAAM,QAAgB;AAAA,EAO3B,YACU,IACR,gBACA;AAFQ,SAAA,KAAA;AAPV,SAAS,QAA+C,IAAIA,MAAAA;AAAAA,MAC1D,uBAAA;AAAA,IAA+B;AAGjC,SAAA,aAAoC;AAgBpC,SAAA,aAAa,CAAC,eAAsD;AAClE,WAAK,UAAU,EAAE,GAAG,KAAK,SAAS,GAAG,WAAA;AAAA,IAAW;AAGlD,SAAA,YAAY,CAAC,aAAkD;AAC7D,WAAK,MAAM,SAAS,CAAC,UAAU;AAC7B,cAAM,gBAAgB;AAAA,UACpB,GAAG;AAAA,UACH,GAAG;AAAA,QAAA;AAEL,cAAM,EAAE,WAAW,MAAA,IAAU;AAC7B,cAAM,OAAO,MAAM;AACnB,cAAM,UAAU,SAAS;AACzB,eAAO;AAAA,UACL,GAAG;AAAA,UACH;AAAA,UACA;AAAA,UACA,QAAQ,YAAY,YAAY;AAAA,QAAA;AAAA,MAClC,CACD;AAAA,IAAA;AAGH,SAAA,WAAW,MAAc;AACvB,aAAOC,MAAAA,qBAAqB,KAAK,QAAQ,MAAM,IAAI;AAAA,IAAA;AAOrD,SAAA,UAAU,CAAC,SAAuB;AAChC,WAAK,UAAU;AAAA,QACb,OAAO,CAAC,GAAG,KAAK,MAAM,MAAM,OAAO,IAAI;AAAA,QACvC,WAAW,KAAK,QAAQ,SAAS;AAAA,MAAA,CAClC;AACD,WAAK,QAAQ,gBAAgB,IAAI;AAEjC,YAAM,gBACJ,KAAK,MAAM,MAAM,MAAM,UAAU,KAAK,QAAQ,WAC9C,KAAK,QAAQ,iBAAiB,KAAK,MAAM,MAAM,OAAO,IAAI;AAE5D,UAAI,eAAe;AACjB,aAAK,SAAA;AAAA,MAAS,WACL,KAAK,QAAQ,SAAS,UAAU;AACzC,aAAK,cAAA;AACL,aAAK,aAAa,WAAW,MAAM,KAAK,YAAY,KAAK,UAAU;AAAA,MAAA;AAAA,IACrE;AAYF,SAAA,WAAW,MAAY;AACrB,UAAI,KAAK,MAAM,MAAM,MAAM,WAAW,GAAG;AACvC;AAAA,MAAA;AAGF,YAAMC,SAAQ,KAAK,aAAA;AACnB,WAAK,MAAA;AACL,WAAK,QAAQ,gBAAgB,IAAI;AAEjC,WAAK,GAAGA,MAAK;AACb,WAAK,UAAU;AAAA,QACb,gBAAgB,KAAK,MAAM,MAAM,iBAAiB;AAAA,QAClD,qBAAqB,KAAK,MAAM,MAAM,sBAAsBA,OAAM;AAAA,MAAA,CACnE;AACD,WAAK,QAAQ,YAAY,IAAI;AAAA,IAAA;AAM/B,SAAA,QAAQ,MAAY;AAClB,WAAK,cAAA;AACL,WAAK,SAAA;AAAA,IAAS;AAMhB,SAAA,eAAe,MAAqB;AAClC,aAAO,CAAC,GAAG,KAAK,MAAM,MAAM,KAAK;AAAA,IAAA;AAGnC,SAAA,gBAAgB,MAAY;AAC1B,UAAI,KAAK,YAAY;AACnB,qBAAa,KAAK,UAAU;AAC5B,aAAK,aAAa;AAAA,MAAA;AAAA,IACpB;AAMF,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,EAAE,OAAO,CAAA,GAAI,WAAW,OAAO;AAAA,IAAA;AAMhD,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,wBAAgC;AAC/C,WAAK,QAAQ,gBAAgB,IAAI;AAAA,IAAA;AAvHjC,SAAK,UAAU;AAAA,MACb,GAAG;AAAA,MACH,GAAG;AAAA,IAAA;AAEL,SAAK,UAAU,KAAK,QAAQ,gBAAgB,CAAA,CAAE;AAAA,EAAA;AAAA,EAVhD;AAAA,EAoBA;AAAA,EAkBA;AAAA,EAoCA;AAAA,EAgCA;AAqBF;AAoBO,SAAS,MACd,IACA,SACA;AACA,QAAM,UAAU,IAAI,QAAgB,IAAI,OAAO;AAC/C,SAAO,QAAQ;AACjB;;;"}

dist/cjs/batcher.d.cts

@@ -17,10 +17,2 @@ import { Store } from '@tanstack/store';
     /**
-     * Whether the batcher is active and will process items automatically
-     */
-    isRunning: boolean;
-    /**
-     * Total number of items that have been processed across all batches
-     */
-    totalItemsProcessed: number;
-    /**
      * Array of items currently queued for batch processing
@@ -37,2 +29,6 @@ */
     status: 'idle' | 'pending';
+    /**
+     * Total number of items that have been processed across all batches
+     */
+    totalItemsProcessed: number;
 }
@@ -137,10 +133,2 @@ /**
     /**
-     * Stops the batcher from processing batches
-     */
-    stop: () => void;
-    /**
-     * Starts the batcher and processes any pending items
-     */
-    start: () => void;
-    /**
      * Returns a copy of all items in the batcher
@@ -147,0 +135,0 @@ */

dist/cjs/queuer.cjs

@@ -158,2 +158,7 @@ "use strict";
     };
+    this.#getAllItems = () => {
+      const items = this.peekAllItems();
+      this.clear();
+      return items;
+    };
     this.execute = (position) => {
@@ -177,2 +182,7 @@ const item = this.getNextItem(position);
     };
+    this.flushAsBatch = (batchFunction) => {
+      const items = this.#getAllItems();
+      this.clear();
+      batchFunction(items);
+    };
     this.#checkExpiredItems = () => {
@@ -272,2 +282,3 @@ if ((this.options.expirationDuration ?? Infinity) === Infinity && this.options.getIsExpired === defaultOptions.getIsExpired) {
   #tick;
+  #getAllItems;
   #checkExpiredItems;
@@ -274,0 +285,0 @@ #clearTimeout;

dist/cjs/queuer.cjs.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"queuer.cjs","sources":["../../src/queuer.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\n\nexport interface QueuerState<TValue> {\n  /**\n   * Number of items that have been processed by the queuer\n   */\n  executionCount: number\n  /**\n   * Number of items that have been removed from the queue due to expiration\n   */\n  expirationCount: number\n  /**\n   * Whether the queuer has no items to process (items array is empty)\n   */\n  isEmpty: boolean\n  /**\n   * Whether the queuer has reached its maximum capacity\n   */\n  isFull: boolean\n  /**\n   * Whether the queuer is not currently processing any items\n   */\n  isIdle: boolean\n  /**\n   * Whether the queuer is active and will process items automatically\n   */\n  isRunning: boolean\n  /**\n   * Timestamps when items were added to the queue for expiration tracking\n   */\n  itemTimestamps: Array<number>\n  /**\n   * Array of items currently waiting to be processed\n   */\n  items: Array<TValue>\n  /**\n   * Whether the queuer has a pending timeout for processing the next item\n   */\n  pendingTick: boolean\n  /**\n   * Number of items that have been rejected from being added to the queue\n   */\n  rejectionCount: number\n  /**\n   * Number of items currently in the queue\n   */\n  size: number\n  /**\n   * Current processing status - 'idle' when not processing, 'running' when active, 'stopped' when paused\n   */\n  status: 'idle' | 'running' | 'stopped'\n}\n\nfunction getDefaultQueuerState<TValue>(): QueuerState<TValue> {\n  return {\n    executionCount: 0,\n    expirationCount: 0,\n    isEmpty: true,\n    isFull: false,\n    isIdle: true,\n    isRunning: true,\n    itemTimestamps: [],\n    items: [],\n    pendingTick: false,\n    rejectionCount: 0,\n    size: 0,\n    status: 'idle',\n  }\n}\n\n/**\n * Options for configuring a Queuer instance.\n *\n * These options control queue behavior, item expiration, callbacks, and more.\n */\nexport interface QueuerOptions<TValue> {\n  /**\n   * Default position to add items to the queuer\n   * @default 'back'\n   */\n  addItemsTo?: QueuePosition\n  /**\n   * Maximum time in milliseconds that an item can stay in the queue\n   * If not provided, items will never expire\n   */\n  expirationDuration?: number\n  /**\n   * Function to determine if an item has expired\n   * If provided, this overrides the expirationDuration behavior\n   */\n  getIsExpired?: (item: TValue, addedAt: number) => boolean\n  /**\n   * Default position to get items from during processing\n   * @default 'front'\n   */\n  getItemsFrom?: QueuePosition\n  /**\n   * Function to determine priority of items in the queuer\n   * Higher priority items will be processed first\n   */\n  getPriority?: (item: TValue) => number\n  /**\n   * Initial items to populate the queuer with\n   */\n  initialItems?: Array<TValue>\n  /**\n   * Initial state for the queuer\n   */\n  initialState?: Partial<QueuerState<TValue>>\n  /**\n   * Maximum number of items allowed in the queuer\n   */\n  maxSize?: number\n  /**\n   * Callback fired whenever an item expires in the queuer\n   */\n  onExpire?: (item: TValue, queuer: Queuer<TValue>) => void\n  /**\n   * Callback fired whenever an item is removed from the queuer\n   */\n  onExecute?: (item: TValue, queuer: Queuer<TValue>) => void\n  /**\n   * Callback fired whenever an item is added or removed from the queuer\n   */\n  onItemsChange?: (queuer: Queuer<TValue>) => void\n  /**\n   * Callback fired whenever an item is rejected from being added to the queuer\n   */\n  onReject?: (item: TValue, queuer: Queuer<TValue>) => void\n  /**\n   * Whether the queuer should start processing tasks immediately\n   */\n  started?: boolean\n  /**\n   * Time in milliseconds to wait between processing items.\n   * Can be a number or a function that returns a number.\n   * @default 0\n   */\n  wait?: number | ((queuer: Queuer<TValue>) => number)\n}\n\nconst defaultOptions: Omit<\n  Required<QueuerOptions<any>>,\n  | 'initialState'\n  | 'onExecute'\n  | 'onIsRunningChange'\n  | 'onItemsChange'\n  | 'onReject'\n  | 'onExpire'\n> = {\n  addItemsTo: 'back',\n  getItemsFrom: 'front',\n  getPriority: (item) => item?.priority ?? 0,\n  getIsExpired: () => false,\n  expirationDuration: Infinity,\n  initialItems: [],\n  maxSize: Infinity,\n  started: true,\n  wait: 0,\n}\n\n/**\n * Position type for addItem and getNextItem operations.\n *\n * - 'front': Operate on the front of the queue (FIFO)\n * - 'back': Operate on the back of the queue (LIFO)\n */\nexport type QueuePosition = 'front' | 'back'\n\n/**\n * A flexible queue that processes items with configurable wait times, expiration, and priority.\n *\n * Features:\n * - Automatic or manual processing of items\n * - FIFO (First In First Out), LIFO (Last In First Out), or double-ended queue behavior\n * - Priority-based ordering when getPriority is provided\n * - Item expiration and removal of stale items\n * - Callbacks for queue state changes, execution, rejection, and expiration\n *\n * Running behavior:\n * - `start()`: Begins automatically processing items in the queue (defaults to isRunning)\n * - `stop()`: Pauses processing but maintains queue state\n * - `wait`: Configurable delay between processing items\n * - `onItemsChange`/`onExecute`: Callbacks for monitoring queue state\n *\n * Manual processing is also supported when automatic processing is disabled:\n * - `execute()`: Processes the next item using the provided function\n * - `getNextItem()`: Removes and returns the next item without processing\n *\n * Queue behavior defaults to FIFO:\n * - `addItem(item)`: Adds to the back of the queue\n * - Items processed from the front of the queue\n *\n * Priority queue:\n * - Provide a `getPriority` function; higher values are processed first\n *\n * Stack (LIFO):\n * - `addItem(item, 'back')`: Adds to the back\n * - `getNextItem('back')`: Removes from the back\n *\n * Double-ended queue:\n * - `addItem(item, position)`: Adds to specified position ('front'/'back')\n * - `getNextItem(position)`: Removes from specified position\n *\n * Item expiration:\n * - `expirationDuration`: Maximum time items can stay in the queue\n * - `getIsExpired`: Function to override default expiration\n * - `onExpire`: Callback for expired items\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the queuer\n * - Use `onExecute` callback to react to item execution and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the queue\n * - Use `onExpire` callback to react to items expiring and implement custom logic\n * - Use `onReject` callback to react to items being rejected when the queue is full\n * - The state includes execution count, expiration count, rejection count, and isRunning status\n * - State can be accessed via `queuer.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `queuer.state`\n *\n * Example usage:\n * ```ts\n * // Auto-processing queue with wait time\n * const autoQueue = new Queuer<number>((n) => console.log(n), {\n *   started: true, // Begin processing immediately\n *   wait: 1000, // Wait 1s between items\n *   onExecute: (item) => console.log(`Processed ${item}`)\n * });\n * autoQueue.addItem(1); // Will process after 1s\n * autoQueue.addItem(2); // Will process 1s after first item\n *\n * // Manual processing queue\n * const manualQueue = new Queuer<number>((n) => console.log(n), {\n *   started: false\n * });\n * manualQueue.addItem(1); // [1]\n * manualQueue.addItem(2); // [1, 2]\n * manualQueue.execute(); // logs 1, queue is [2]\n * manualQueue.getNextItem(); // returns 2, queue is empty\n * ```\n */\nexport class Queuer<TValue> {\n  readonly store: Store<Readonly<QueuerState<TValue>>> = new Store(\n    getDefaultQueuerState<TValue>(),\n  )\n  options: QueuerOptions<TValue>\n  #timeoutId: NodeJS.Timeout | null = null\n\n  constructor(\n    private fn: (item: TValue) => void,\n    initialOptions: QueuerOptions<TValue> = {},\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n    }\n    const isInitiallyRunning =\n      this.options.initialState?.isRunning ?? this.options.started ?? true\n    this.#setState({\n      ...this.options.initialState,\n      isRunning: isInitiallyRunning,\n    })\n\n    if (this.options.initialState?.items) {\n      if (this.store.state.isRunning) {\n        this.#tick()\n      }\n    } else {\n      for (let i = 0; i < (this.options.initialItems?.length ?? 0); i++) {\n        const item = this.options.initialItems![i]!\n        const isLast = i === (this.options.initialItems?.length ?? 0) - 1\n        this.addItem(item, this.options.addItemsTo ?? 'back', isLast)\n      }\n    }\n  }\n\n  /**\n   * Updates the queuer options. New options are merged with existing options.\n   */\n  setOptions = (newOptions: Partial<QueuerOptions<TValue>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<QueuerState<TValue>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n\n      const { items, isRunning } = combinedState\n\n      const size = items.length\n      const isFull = size >= (this.options.maxSize ?? Infinity)\n      const isEmpty = size === 0\n      const isIdle = isRunning && isEmpty\n\n      const status = isIdle ? 'idle' : isRunning ? 'running' : 'stopped'\n\n      return {\n        ...combinedState,\n        isEmpty,\n        isFull,\n        isIdle,\n        size,\n        status,\n      }\n    })\n  }\n\n  /**\n   * Returns the current wait time (in milliseconds) between processing items.\n   * If a function is provided, it is called with the queuer instance.\n   */\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait ?? 0, this)\n  }\n\n  /**\n   * Processes items in the queue up to the wait interval. Internal use only.\n   */\n  #tick = () => {\n    if (!this.store.state.isRunning) {\n      this.#setState({ pendingTick: false })\n      return\n    }\n\n    this.#setState({ pendingTick: true })\n\n    // Check for expired items\n    this.#checkExpiredItems()\n\n    while (this.store.state.items.length > 0) {\n      const nextItem = this.execute(this.options.getItemsFrom ?? 'front')\n      if (nextItem === undefined) {\n        break\n      }\n\n      const wait = this.#getWait()\n      if (wait > 0) {\n        // Use setTimeout to wait before processing next item\n        this.#timeoutId = setTimeout(() => this.#tick(), wait)\n        return\n      }\n\n      this.#tick()\n    }\n    this.#setState({ pendingTick: false })\n  }\n\n  /**\n   * Adds an item to the queue. If the queue is full, the item is rejected and onReject is called.\n   * Items can be inserted based on priority or at the front/back depending on configuration.\n   *\n   * Returns true if the item was added, false if the queue is full.\n   *\n   * Example usage:\n   * ```ts\n   * queuer.addItem('task');\n   * queuer.addItem('task2', 'front');\n   * ```\n   */\n  addItem = (\n    item: TValue,\n    position: QueuePosition = this.options.addItemsTo ?? 'back',\n    runOnItemsChange: boolean = true,\n  ): boolean => {\n    if (this.store.state.items.length >= (this.options.maxSize ?? Infinity)) {\n      this.#setState({\n        rejectionCount: this.store.state.rejectionCount + 1,\n      })\n      this.options.onReject?.(item, this)\n      return false\n    }\n\n    // Get priority either from the function or from getPriority option\n    const priority =\n      this.options.getPriority !== defaultOptions.getPriority\n        ? this.options.getPriority!(item)\n        : (item as any).priority\n\n    const items = this.store.state.items\n    const itemTimestamps = this.store.state.itemTimestamps\n\n    if (priority !== undefined) {\n      // Insert based on priority - higher priority items go to front\n      const insertIndex = items.findIndex((existing) => {\n        const existingPriority: number =\n          this.options.getPriority !== defaultOptions.getPriority\n            ? this.options.getPriority!(existing)\n            : (existing as any).priority\n        return existingPriority < priority\n      })\n\n      if (insertIndex === -1) {\n        items.push(item)\n        itemTimestamps.push(Date.now())\n      } else {\n        items.splice(insertIndex, 0, item)\n        itemTimestamps.splice(insertIndex, 0, Date.now())\n      }\n    } else {\n      if (position === 'front') {\n        // Default FIFO/LIFO behavior\n        items.unshift(item)\n        itemTimestamps.unshift(Date.now())\n      } else {\n        // LIFO\n        items.push(item)\n        itemTimestamps.push(Date.now())\n      }\n    }\n\n    this.#setState({\n      items,\n      itemTimestamps,\n    })\n\n    if (runOnItemsChange) {\n      this.options.onItemsChange?.(this)\n    }\n\n    if (this.store.state.isRunning && !this.store.state.pendingTick) {\n      this.#setState({ pendingTick: true })\n      this.#tick()\n    }\n\n    return true\n  }\n\n  /**\n   * Removes and returns the next item from the queue without executing the function.\n   * Use for manual queue management. Normally, use execute() to process items.\n   *\n   * Example usage:\n   * ```ts\n   * // FIFO\n   * queuer.getNextItem();\n   * // LIFO\n   * queuer.getNextItem('back');\n   * ```\n   */\n  getNextItem = (\n    position: QueuePosition = this.options.getItemsFrom ?? 'front',\n  ): TValue | undefined => {\n    const { items, itemTimestamps } = this.store.state\n    let item: TValue | undefined\n\n    if (position === 'front') {\n      item = items[0]\n      if (item !== undefined) {\n        this.#setState({\n          items: items.slice(1),\n          itemTimestamps: itemTimestamps.slice(1),\n        })\n      }\n    } else {\n      item = items[items.length - 1]\n      if (item !== undefined) {\n        this.#setState({\n          items: items.slice(0, -1),\n          itemTimestamps: itemTimestamps.slice(0, -1),\n        })\n      }\n    }\n\n    if (item !== undefined) {\n      this.options.onItemsChange?.(this)\n    }\n\n    return item\n  }\n\n  /**\n   * Removes and returns the next item from the queue and processes it using the provided function.\n   *\n   * Example usage:\n   * ```ts\n   * queuer.execute();\n   * // LIFO\n   * queuer.execute('back');\n   * ```\n   */\n  execute = (position?: QueuePosition): TValue | undefined => {\n    const item = this.getNextItem(position)\n    if (item !== undefined) {\n      this.fn(item)\n      this.#setState({\n        executionCount: this.store.state.executionCount + 1,\n      })\n      this.options.onExecute?.(item, this)\n    }\n    return item\n  }\n\n  /**\n   * Processes a specified number of items to execute immediately with no wait time\n   * If no numberOfItems is provided, all items will be processed\n   */\n  flush = (\n    numberOfItems: number = this.store.state.items.length,\n    position?: QueuePosition,\n  ): void => {\n    this.#clearTimeout() // clear any pending timeout\n    for (let i = 0; i < numberOfItems; i++) {\n      this.execute(position)\n    }\n    this.#tick()\n  }\n\n  /**\n   * Checks for expired items in the queue and removes them. Calls onExpire for each expired item.\n   * Internal use only.\n   */\n  #checkExpiredItems = (): void => {\n    if (\n      (this.options.expirationDuration ?? Infinity) === Infinity &&\n      this.options.getIsExpired === defaultOptions.getIsExpired\n    ) {\n      return\n    }\n\n    const now = Date.now()\n    const expiredIndices: Array<number> = []\n\n    // Find indices of expired items\n    for (let i = 0; i < this.store.state.items.length; i++) {\n      const timestamp = this.store.state.itemTimestamps[i]\n      if (timestamp === undefined) continue\n\n      const item = this.store.state.items[i]\n      if (item === undefined) continue\n\n      const isExpired =\n        this.options.getIsExpired !== defaultOptions.getIsExpired\n          ? this.options.getIsExpired!(item, timestamp)\n          : now - timestamp > (this.options.expirationDuration ?? 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If already isRunning, does nothing.\n   */\n  start = () => {\n    this.#setState({ isRunning: true })\n    if (!this.store.state.pendingTick && this.store.state.items.length > 0) {\n      this.#tick()\n    }\n  }\n\n  /**\n   * Stops processing items in the queue. Does not clear the queue.\n   */\n  stop = () => {\n    this.#clearTimeout()\n    this.#setState({ isRunning: false, pendingTick: false })\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = null\n    }\n  }\n\n  /**\n   * Removes all pending items from the queue. Does not affect items being processed.\n   */\n  clear = (): void => {\n    this.#setState({ items: [], itemTimestamps: [] })\n    this.options.onItemsChange?.(this)\n  }\n\n  /**\n   * Resets the queuer state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultQueuerState<TValue>())\n    this.options.onItemsChange?.(this)\n  }\n}\n\n/**\n * Creates a queue that processes items immediately upon addition.\n * Items are processed sequentially in FIFO order by default.\n *\n * This is a simplified wrapper around the Queuer class that only exposes the\n * `addItem` method. The queue is always isRunning and will process items as they are added.\n * For more control over queue processing, use the Queuer class directly.\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the queuer\n * - Use `onExecute` callback to react to item execution and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the queue\n * - Use `onExpire` callback to react to items expiring and implement custom logic\n * - Use `onReject` callback to react to items being rejected when the queue is full\n * - The state includes execution count, expiration count, rejection count, and isRunning status\n * - State can be accessed via the underlying Queuer instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * Example usage:\n * ```ts\n * // Basic sequential processing\n * const processItems = queue<number>((n) => console.log(n), {\n *   wait: 1000,\n *   onItemsChange: (queuer) => console.log(queuer.peekAllItems())\n * });\n * processItems(1); // Logs: 1\n * processItems(2); // Logs: 2 after 1 completes\n *\n * // Priority queue\n * const processPriority = queue<number>((n) => console.log(n), {\n *   getPriority: n => n // Higher numbers processed first\n * });\n * processPriority(1);\n * processPriority(3); // Processed before 1\n * ```\n */\nexport function queue<TValue>(\n  fn: (item: TValue) => void,\n  initialOptions: QueuerOptions<TValue>,\n) {\n  const queuer = new Queuer<TValue>(fn, initialOptions)\n  return 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+{"version":3,"file":"queuer.cjs","sources":["../../src/queuer.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\n\nexport interface QueuerState<TValue> {\n  /**\n   * Number of items that have been processed by the queuer\n   */\n  executionCount: number\n  /**\n   * Number of items that have been removed from the queue due to expiration\n   */\n  expirationCount: number\n  /**\n   * Whether the queuer has no items to process (items array is empty)\n   */\n  isEmpty: boolean\n  /**\n   * Whether the queuer has reached its maximum capacity\n   */\n  isFull: boolean\n  /**\n   * Whether the queuer is not currently processing any items\n   */\n  isIdle: boolean\n  /**\n   * Whether the queuer is active and will process items automatically\n   */\n  isRunning: boolean\n  /**\n   * Array of items currently waiting to be processed\n   */\n  items: Array<TValue>\n  /**\n   * Timestamps when items were added to the queue for expiration tracking\n   */\n  itemTimestamps: Array<number>\n  /**\n   * Whether the queuer has a pending timeout for processing the next item\n   */\n  pendingTick: boolean\n  /**\n   * Number of items that have been rejected from being added to the queue\n   */\n  rejectionCount: number\n  /**\n   * Number of items currently in the queue\n   */\n  size: number\n  /**\n   * Current processing status - 'idle' when not processing, 'running' when active, 'stopped' when paused\n   */\n  status: 'idle' | 'running' | 'stopped'\n}\n\nfunction getDefaultQueuerState<TValue>(): QueuerState<TValue> {\n  return {\n    executionCount: 0,\n    expirationCount: 0,\n    isEmpty: true,\n    isFull: false,\n    isIdle: true,\n    isRunning: true,\n    itemTimestamps: [],\n    items: [],\n    pendingTick: false,\n    rejectionCount: 0,\n    size: 0,\n    status: 'idle',\n  }\n}\n\n/**\n * Options for configuring a Queuer instance.\n *\n * These options control queue behavior, item expiration, callbacks, and more.\n */\nexport interface QueuerOptions<TValue> {\n  /**\n   * Default position to add items to the queuer\n   * @default 'back'\n   */\n  addItemsTo?: QueuePosition\n  /**\n   * Maximum time in milliseconds that an item can stay in the queue\n   * If not provided, items will never expire\n   */\n  expirationDuration?: number\n  /**\n   * Function to determine if an item has expired\n   * If provided, this overrides the expirationDuration behavior\n   */\n  getIsExpired?: (item: TValue, addedAt: number) => boolean\n  /**\n   * Default position to get items from during processing\n   * @default 'front'\n   */\n  getItemsFrom?: QueuePosition\n  /**\n   * Function to determine priority of items in the queuer\n   * Higher priority items will be processed first\n   */\n  getPriority?: (item: TValue) => number\n  /**\n   * Initial items to populate the queuer with\n   */\n  initialItems?: Array<TValue>\n  /**\n   * Initial state for the queuer\n   */\n  initialState?: Partial<QueuerState<TValue>>\n  /**\n   * Maximum number of items allowed in the queuer\n   */\n  maxSize?: number\n  /**\n   * Callback fired whenever an item is removed from the queuer\n   */\n  onExecute?: (item: TValue, queuer: Queuer<TValue>) => void\n  /**\n   * Callback fired whenever an item expires in the queuer\n   */\n  onExpire?: (item: TValue, queuer: Queuer<TValue>) => void\n  /**\n   * Callback fired whenever an item is added or removed from the queuer\n   */\n  onItemsChange?: (queuer: Queuer<TValue>) => void\n  /**\n   * Callback fired whenever an item is rejected from being added to the queuer\n   */\n  onReject?: (item: TValue, queuer: Queuer<TValue>) => void\n  /**\n   * Whether the queuer should start processing tasks immediately\n   */\n  started?: boolean\n  /**\n   * Time in milliseconds to wait between processing items.\n   * Can be a number or a function that returns a number.\n   * @default 0\n   */\n  wait?: number | ((queuer: Queuer<TValue>) => number)\n}\n\nconst defaultOptions: Omit<\n  Required<QueuerOptions<any>>,\n  | 'initialState'\n  | 'onExecute'\n  | 'onIsRunningChange'\n  | 'onItemsChange'\n  | 'onReject'\n  | 'onExpire'\n> = {\n  addItemsTo: 'back',\n  getItemsFrom: 'front',\n  getPriority: (item) => item?.priority ?? 0,\n  getIsExpired: () => false,\n  expirationDuration: Infinity,\n  initialItems: [],\n  maxSize: Infinity,\n  started: true,\n  wait: 0,\n}\n\n/**\n * Position type for addItem and getNextItem operations.\n *\n * - 'front': Operate on the front of the queue (FIFO)\n * - 'back': Operate on the back of the queue (LIFO)\n */\nexport type QueuePosition = 'front' | 'back'\n\n/**\n * A flexible queue that processes items with configurable wait times, expiration, and priority.\n *\n * Features:\n * - Automatic or manual processing of items\n * - FIFO (First In First Out), LIFO (Last In First Out), or double-ended queue behavior\n * - Priority-based ordering when getPriority is provided\n * - Item expiration and removal of stale items\n * - Callbacks for queue state changes, execution, rejection, and expiration\n *\n * Running behavior:\n * - `start()`: Begins automatically processing items in the queue (defaults to isRunning)\n * - `stop()`: Pauses processing but maintains queue state\n * - `wait`: Configurable delay between processing items\n * - `onItemsChange`/`onExecute`: Callbacks for monitoring queue state\n *\n * Manual processing is also supported when automatic processing is disabled:\n * - `execute()`: Processes the next item using the provided function\n * - `getNextItem()`: Removes and returns the next item without processing\n *\n * Queue behavior defaults to FIFO:\n * - `addItem(item)`: Adds to the back of the queue\n * - Items processed from the front of the queue\n *\n * Priority queue:\n * - Provide a `getPriority` function; higher values are processed first\n *\n * Stack (LIFO):\n * - `addItem(item, 'back')`: Adds to the back\n * - `getNextItem('back')`: Removes from the back\n *\n * Double-ended queue:\n * - `addItem(item, position)`: Adds to specified position ('front'/'back')\n * - `getNextItem(position)`: Removes from specified position\n *\n * Item expiration:\n * - `expirationDuration`: Maximum time items can stay in the queue\n * - `getIsExpired`: Function to override default expiration\n * - `onExpire`: Callback for expired items\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the queuer\n * - Use `onExecute` callback to react to item execution and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the queue\n * - Use `onExpire` callback to react to items expiring and implement custom logic\n * - Use `onReject` callback to react to items being rejected when the queue is full\n * - The state includes execution count, expiration count, rejection count, and isRunning status\n * - State can be accessed via `queuer.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `queuer.state`\n *\n * Example usage:\n * ```ts\n * // Auto-processing queue with wait time\n * const autoQueue = new Queuer<number>((n) => console.log(n), {\n *   started: true, // Begin processing immediately\n *   wait: 1000, // Wait 1s between items\n *   onExecute: (item) => console.log(`Processed ${item}`)\n * });\n * autoQueue.addItem(1); // Will process after 1s\n * autoQueue.addItem(2); // Will process 1s after first item\n *\n * // Manual processing queue\n * const manualQueue = new Queuer<number>((n) => console.log(n), {\n *   started: false\n * });\n * manualQueue.addItem(1); // [1]\n * manualQueue.addItem(2); // [1, 2]\n * manualQueue.execute(); // logs 1, queue is [2]\n * manualQueue.getNextItem(); // returns 2, queue is empty\n * ```\n */\nexport class Queuer<TValue> {\n  readonly store: Store<Readonly<QueuerState<TValue>>> = new Store(\n    getDefaultQueuerState<TValue>(),\n  )\n  options: QueuerOptions<TValue>\n  #timeoutId: NodeJS.Timeout | null = null\n\n  constructor(\n    private fn: (item: TValue) => void,\n    initialOptions: QueuerOptions<TValue> = {},\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n    }\n    const isInitiallyRunning =\n      this.options.initialState?.isRunning ?? this.options.started ?? true\n    this.#setState({\n      ...this.options.initialState,\n      isRunning: isInitiallyRunning,\n    })\n\n    if (this.options.initialState?.items) {\n      if (this.store.state.isRunning) {\n        this.#tick()\n      }\n    } else {\n      for (let i = 0; i < (this.options.initialItems?.length ?? 0); i++) {\n        const item = this.options.initialItems![i]!\n        const isLast = i === (this.options.initialItems?.length ?? 0) - 1\n        this.addItem(item, this.options.addItemsTo ?? 'back', isLast)\n      }\n    }\n  }\n\n  /**\n   * Updates the queuer options. New options are merged with existing options.\n   */\n  setOptions = (newOptions: Partial<QueuerOptions<TValue>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<QueuerState<TValue>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n\n      const { items, isRunning } = combinedState\n\n      const size = items.length\n      const isFull = size >= (this.options.maxSize ?? Infinity)\n      const isEmpty = size === 0\n      const isIdle = isRunning && isEmpty\n\n      const status = isIdle ? 'idle' : isRunning ? 'running' : 'stopped'\n\n      return {\n        ...combinedState,\n        isEmpty,\n        isFull,\n        isIdle,\n        size,\n        status,\n      }\n    })\n  }\n\n  /**\n   * Returns the current wait time (in milliseconds) between processing items.\n   * If a function is provided, it is called with the queuer instance.\n   */\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait ?? 0, this)\n  }\n\n  /**\n   * Processes items in the queue up to the wait interval. Internal use only.\n   */\n  #tick = () => {\n    if (!this.store.state.isRunning) {\n      this.#setState({ pendingTick: false })\n      return\n    }\n\n    this.#setState({ pendingTick: true })\n\n    // Check for expired items\n    this.#checkExpiredItems()\n\n    while (this.store.state.items.length > 0) {\n      const nextItem = this.execute(this.options.getItemsFrom ?? 'front')\n      if (nextItem === undefined) {\n        break\n      }\n\n      const wait = this.#getWait()\n      if (wait > 0) {\n        // Use setTimeout to wait before processing next item\n        this.#timeoutId = setTimeout(() => this.#tick(), wait)\n        return\n      }\n\n      this.#tick()\n    }\n    this.#setState({ pendingTick: false })\n  }\n\n  /**\n   * Adds an item to the queue. If the queue is full, the item is rejected and onReject is called.\n   * Items can be inserted based on priority or at the front/back depending on configuration.\n   *\n   * Returns true if the item was added, false if the queue is full.\n   *\n   * Example usage:\n   * ```ts\n   * queuer.addItem('task');\n   * queuer.addItem('task2', 'front');\n   * ```\n   */\n  addItem = (\n    item: TValue,\n    position: QueuePosition = this.options.addItemsTo ?? 'back',\n    runOnItemsChange: boolean = true,\n  ): boolean => {\n    if (this.store.state.items.length >= (this.options.maxSize ?? Infinity)) {\n      this.#setState({\n        rejectionCount: this.store.state.rejectionCount + 1,\n      })\n      this.options.onReject?.(item, this)\n      return false\n    }\n\n    // Get priority either from the function or from getPriority option\n    const priority =\n      this.options.getPriority !== defaultOptions.getPriority\n        ? this.options.getPriority!(item)\n        : (item as any).priority\n\n    const items = this.store.state.items\n    const itemTimestamps = this.store.state.itemTimestamps\n\n    if (priority !== undefined) {\n      // Insert based on priority - higher priority items go to front\n      const insertIndex = items.findIndex((existing) => {\n        const existingPriority: number =\n          this.options.getPriority !== defaultOptions.getPriority\n            ? this.options.getPriority!(existing)\n            : (existing as any).priority\n        return existingPriority < priority\n      })\n\n      if (insertIndex === -1) {\n        items.push(item)\n        itemTimestamps.push(Date.now())\n      } else {\n        items.splice(insertIndex, 0, item)\n        itemTimestamps.splice(insertIndex, 0, Date.now())\n      }\n    } else {\n      if (position === 'front') {\n        // Default FIFO/LIFO behavior\n        items.unshift(item)\n        itemTimestamps.unshift(Date.now())\n      } else {\n        // LIFO\n        items.push(item)\n        itemTimestamps.push(Date.now())\n      }\n    }\n\n    this.#setState({\n      items,\n      itemTimestamps,\n    })\n\n    if (runOnItemsChange) {\n      this.options.onItemsChange?.(this)\n    }\n\n    if (this.store.state.isRunning && !this.store.state.pendingTick) {\n      this.#setState({ pendingTick: true })\n      this.#tick()\n    }\n\n    return true\n  }\n\n  /**\n   * Removes and returns the next item from the queue without executing the function.\n   * Use for manual queue management. Normally, use execute() to process items.\n   *\n   * Example usage:\n   * ```ts\n   * // FIFO\n   * queuer.getNextItem();\n   * // LIFO\n   * queuer.getNextItem('back');\n   * ```\n   */\n  getNextItem = (\n    position: QueuePosition = this.options.getItemsFrom ?? 'front',\n  ): TValue | undefined => {\n    const { items, itemTimestamps } = this.store.state\n    let item: TValue | undefined\n\n    if (position === 'front') {\n      item = items[0]\n      if (item !== undefined) {\n        this.#setState({\n          items: items.slice(1),\n          itemTimestamps: itemTimestamps.slice(1),\n        })\n      }\n    } else {\n      item = items[items.length - 1]\n      if (item !== undefined) {\n        this.#setState({\n          items: items.slice(0, -1),\n          itemTimestamps: itemTimestamps.slice(0, -1),\n        })\n      }\n    }\n\n    if (item !== undefined) {\n      this.options.onItemsChange?.(this)\n    }\n\n    return item\n  }\n\n  #getAllItems = (): Array<TValue> => {\n    const items = this.peekAllItems()\n    this.clear()\n    return items\n  }\n\n  /**\n   * Removes and returns the next item from the queue and processes it using the provided function.\n   *\n   * Example usage:\n   * ```ts\n   * queuer.execute();\n   * // LIFO\n   * queuer.execute('back');\n   * ```\n   */\n  execute = (position?: QueuePosition): TValue | undefined => {\n    const item = this.getNextItem(position)\n    if (item !== undefined) {\n      this.fn(item)\n      this.#setState({\n        executionCount: this.store.state.executionCount + 1,\n      })\n      this.options.onExecute?.(item, this)\n    }\n    return item\n  }\n\n  /**\n   * Processes a specified number of items to execute immediately with no wait time\n   * If no numberOfItems is provided, all items will be processed\n   */\n  flush = (\n    numberOfItems: number = this.store.state.items.length,\n    position?: QueuePosition,\n  ): void => {\n    this.#clearTimeout() // clear any pending timeout\n    for (let i = 0; i < numberOfItems; i++) {\n      this.execute(position)\n    }\n    this.#tick()\n  }\n\n  /**\n   * Processes all items in the queue as a batch using the provided function\n   * The queue is cleared after processing\n   */\n  flushAsBatch = (batchFunction: (items: Array<TValue>) => void): void => {\n    const items = this.#getAllItems()\n    this.clear()\n    batchFunction(items)\n  }\n\n  /**\n   * Checks for expired items in the queue and removes them. Calls onExpire for each expired item.\n   * Internal use only.\n   */\n  #checkExpiredItems = (): void => {\n    if (\n      (this.options.expirationDuration ?? Infinity) === Infinity &&\n      this.options.getIsExpired === defaultOptions.getIsExpired\n    ) {\n      return\n    }\n\n    const now = Date.now()\n    const expiredIndices: Array<number> = []\n\n    // Find indices of expired items\n    for (let i = 0; i < this.store.state.items.length; i++) {\n      const timestamp = this.store.state.itemTimestamps[i]\n      if (timestamp === undefined) continue\n\n      const item = this.store.state.items[i]\n      if (item === undefined) continue\n\n      const isExpired =\n        this.options.getIsExpired !== defaultOptions.getIsExpired\n          ? this.options.getIsExpired!(item, timestamp)\n          : now - timestamp > (this.options.expirationDuration ?? Infinity)\n\n      if (isExpired) {\n        expiredIndices.push(i)\n      }\n    }\n\n    // Remove expired items from back to front to maintain indices\n    for (let i = expiredIndices.length - 1; i >= 0; i--) {\n      const index = expiredIndices[i]\n      if (index === undefined) continue\n\n      const expiredItem = this.store.state.items[index]\n      if (expiredItem === undefined) continue\n\n      const newItems = [...this.store.state.items]\n      const newTimestamps = [...this.store.state.itemTimestamps]\n      newItems.splice(index, 1)\n      newTimestamps.splice(index, 1)\n      this.#setState({\n        items: newItems,\n        itemTimestamps: newTimestamps,\n        expirationCount: this.store.state.expirationCount + 1,\n      })\n      this.options.onExpire?.(expiredItem, this)\n    }\n\n    if (expiredIndices.length > 0) {\n      this.options.onItemsChange?.(this)\n    }\n  }\n\n  /**\n   * Returns the next item in the queue without removing it.\n   *\n   * Example usage:\n   * ```ts\n   * queuer.peekNextItem(); // front\n   * queuer.peekNextItem('back'); // back\n   * ```\n   */\n  peekNextItem = (position: QueuePosition = 'front'): TValue | undefined => {\n    if (position === 'front') {\n      return this.store.state.items[0]\n    }\n    return this.store.state.items[this.store.state.items.length - 1]\n  }\n\n  /**\n   * Returns a copy of all items in the queue.\n   */\n  peekAllItems = (): Array<TValue> => {\n    return [...this.store.state.items]\n  }\n\n  /**\n   * Starts processing items in the queue. If already isRunning, does nothing.\n   */\n  start = () => {\n    this.#setState({ isRunning: true })\n    if (!this.store.state.pendingTick && this.store.state.items.length > 0) {\n      this.#tick()\n    }\n  }\n\n  /**\n   * Stops processing items in the queue. Does not clear the queue.\n   */\n  stop = () => {\n    this.#clearTimeout()\n    this.#setState({ isRunning: false, pendingTick: false })\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = null\n    }\n  }\n\n  /**\n   * Removes all pending items from the queue. Does not affect items being processed.\n   */\n  clear = (): void => {\n    this.#setState({ items: [], itemTimestamps: [] })\n    this.options.onItemsChange?.(this)\n  }\n\n  /**\n   * Resets the queuer state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultQueuerState<TValue>())\n    this.options.onItemsChange?.(this)\n  }\n}\n\n/**\n * Creates a queue that processes items immediately upon addition.\n * Items are processed sequentially in FIFO order by default.\n *\n * This is a simplified wrapper around the Queuer class that only exposes the\n * `addItem` method. The queue is always isRunning and will process items as they are added.\n * For more control over queue processing, use the Queuer class directly.\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the queuer\n * - Use `onExecute` callback to react to item execution and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the queue\n * - Use `onExpire` callback to react to items expiring and implement custom logic\n * - Use `onReject` callback to react to items being rejected when the queue is full\n * - The state includes execution count, expiration count, rejection count, and isRunning status\n * - State can be accessed via the underlying Queuer instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * Example usage:\n * ```ts\n * // Basic sequential processing\n * const processItems = queue<number>((n) => console.log(n), {\n *   wait: 1000,\n *   onItemsChange: (queuer) => console.log(queuer.peekAllItems())\n * });\n * processItems(1); // Logs: 1\n * processItems(2); // Logs: 2 after 1 completes\n *\n * // Priority queue\n * const processPriority = queue<number>((n) => console.log(n), {\n *   getPriority: n => n // Higher numbers processed first\n * });\n * processPriority(1);\n * processPriority(3); // Processed before 1\n * ```\n */\nexport function queue<TValue>(\n  fn: (item: TValue) => void,\n  initialOptions: QueuerOptions<TValue>,\n) {\n  const queuer = new Queuer<TValue>(fn, initialOptions)\n  return queuer.addItem\n}\n"],"names":["Store","parseFunctionOrValue"],"mappings":";;;;AAsDA,SAAS,wBAAqD;AAC5D,SAAO;AAAA,IACL,gBAAgB;AAAA,IAChB,iBAAiB;AAAA,IACjB,SAAS;AAAA,IACT,QAAQ;AAAA,IACR,QAAQ;AAAA,IACR,WAAW;AAAA,IACX,gBAAgB,CAAA;AAAA,IAChB,OAAO,CAAA;AAAA,IACP,aAAa;AAAA,IACb,gBAAgB;AAAA,IAChB,MAAM;AAAA,IACN,QAAQ;AAAA,EAAA;AAEZ;AAyEA,MAAM,iBAQF;AAAA,EACF,YAAY;AAAA,EACZ,cAAc;AAAA,EACd,aAAa,CAAC,SAAS,MAAM,YAAY;AAAA,EACzC,cAAc,MAAM;AAAA,EACpB,oBAAoB;AAAA,EACpB,cAAc,CAAA;AAAA,EACd,SAAS;AAAA,EACT,SAAS;AAAA,EACT,MAAM;AACR;AAkFO,MAAM,OAAe;AAAA,EAO1B,YACU,IACR,iBAAwC,IACxC;AAFQ,SAAA,KAAA;AAPV,SAAS,QAA8C,IAAIA,MAAAA;AAAAA,MACzD,sBAAA;AAAA,IAA8B;AAGhC,SAAA,aAAoC;AAiCpC,SAAA,aAAa,CAAC,eAAqD;AACjE,WAAK,UAAU,EAAE,GAAG,KAAK,SAAS,GAAG,WAAA;AAAA,IAAW;AAGlD,SAAA,YAAY,CAAC,aAAiD;AAC5D,WAAK,MAAM,SAAS,CAAC,UAAU;AAC7B,cAAM,gBAAgB;AAAA,UACpB,GAAG;AAAA,UACH,GAAG;AAAA,QAAA;AAGL,cAAM,EAAE,OAAO,UAAA,IAAc;AAE7B,cAAM,OAAO,MAAM;AACnB,cAAM,SAAS,SAAS,KAAK,QAAQ,WAAW;AAChD,cAAM,UAAU,SAAS;AACzB,cAAM,SAAS,aAAa;AAE5B,cAAM,SAAS,SAAS,SAAS,YAAY,YAAY;AAEzD,eAAO;AAAA,UACL,GAAG;AAAA,UACH;AAAA,UACA;AAAA,UACA;AAAA,UACA;AAAA,UACA;AAAA,QAAA;AAAA,MACF,CACD;AAAA,IAAA;AAOH,SAAA,WAAW,MAAc;AACvB,aAAOC,MAAAA,qBAAqB,KAAK,QAAQ,QAAQ,GAAG,IAAI;AAAA,IAAA;AAM1D,SAAA,QAAQ,MAAM;AACZ,UAAI,CAAC,KAAK,MAAM,MAAM,WAAW;AAC/B,aAAK,UAAU,EAAE,aAAa,MAAA,CAAO;AACrC;AAAA,MAAA;AAGF,WAAK,UAAU,EAAE,aAAa,KAAA,CAAM;AAGpC,WAAK,mBAAA;AAEL,aAAO,KAAK,MAAM,MAAM,MAAM,SAAS,GAAG;AACxC,cAAM,WAAW,KAAK,QAAQ,KAAK,QAAQ,gBAAgB,OAAO;AAClE,YAAI,aAAa,QAAW;AAC1B;AAAA,QAAA;AAGF,cAAM,OAAO,KAAK,SAAA;AAClB,YAAI,OAAO,GAAG;AAEZ,eAAK,aAAa,WAAW,MAAM,KAAK,MAAA,GAAS,IAAI;AACrD;AAAA,QAAA;AAGF,aAAK,MAAA;AAAA,MAAM;AAEb,WAAK,UAAU,EAAE,aAAa,MAAA,CAAO;AAAA,IAAA;AAevC,SAAA,UAAU,CACR,MACA,WAA0B,KAAK,QAAQ,cAAc,QACrD,mBAA4B,SAChB;AACZ,UAAI,KAAK,MAAM,MAAM,MAAM,WAAW,KAAK,QAAQ,WAAW,WAAW;AACvE,aAAK,UAAU;AAAA,UACb,gBAAgB,KAAK,MAAM,MAAM,iBAAiB;AAAA,QAAA,CACnD;AACD,aAAK,QAAQ,WAAW,MAAM,IAAI;AAClC,eAAO;AAAA,MAAA;AAIT,YAAM,WACJ,KAAK,QAAQ,gBAAgB,eAAe,cACxC,KAAK,QAAQ,YAAa,IAAI,IAC7B,KAAa;AAEpB,YAAM,QAAQ,KAAK,MAAM,MAAM;AAC/B,YAAM,iBAAiB,KAAK,MAAM,MAAM;AAExC,UAAI,aAAa,QAAW;AAE1B,cAAM,cAAc,MAAM,UAAU,CAAC,aAAa;AAChD,gBAAM,mBACJ,KAAK,QAAQ,gBAAgB,eAAe,cACxC,KAAK,QAAQ,YAAa,QAAQ,IACjC,SAAiB;AACxB,iBAAO,mBAAmB;AAAA,QAAA,CAC3B;AAED,YAAI,gBAAgB,IAAI;AACtB,gBAAM,KAAK,IAAI;AACf,yBAAe,KAAK,KAAK,KAAK;AAAA,QAAA,OACzB;AACL,gBAAM,OAAO,aAAa,GAAG,IAAI;AACjC,yBAAe,OAAO,aAAa,GAAG,KAAK,KAAK;AAAA,QAAA;AAAA,MAClD,OACK;AACL,YAAI,aAAa,SAAS;AAExB,gBAAM,QAAQ,IAAI;AAClB,yBAAe,QAAQ,KAAK,KAAK;AAAA,QAAA,OAC5B;AAEL,gBAAM,KAAK,IAAI;AACf,yBAAe,KAAK,KAAK,KAAK;AAAA,QAAA;AAAA,MAChC;AAGF,WAAK,UAAU;AAAA,QACb;AAAA,QACA;AAAA,MAAA,CACD;AAED,UAAI,kBAAkB;AACpB,aAAK,QAAQ,gBAAgB,IAAI;AAAA,MAAA;AAGnC,UAAI,KAAK,MAAM,MAAM,aAAa,CAAC,KAAK,MAAM,MAAM,aAAa;AAC/D,aAAK,UAAU,EAAE,aAAa,KAAA,CAAM;AACpC,aAAK,MAAA;AAAA,MAAM;AAGb,aAAO;AAAA,IAAA;AAeT,SAAA,cAAc,CACZ,WAA0B,KAAK,QAAQ,gBAAgB,YAChC;AACvB,YAAM,EAAE,OAAO,eAAA,IAAmB,KAAK,MAAM;AAC7C,UAAI;AAEJ,UAAI,aAAa,SAAS;AACxB,eAAO,MAAM,CAAC;AACd,YAAI,SAAS,QAAW;AACtB,eAAK,UAAU;AAAA,YACb,OAAO,MAAM,MAAM,CAAC;AAAA,YACpB,gBAAgB,eAAe,MAAM,CAAC;AAAA,UAAA,CACvC;AAAA,QAAA;AAAA,MACH,OACK;AACL,eAAO,MAAM,MAAM,SAAS,CAAC;AAC7B,YAAI,SAAS,QAAW;AACtB,eAAK,UAAU;AAAA,YACb,OAAO,MAAM,MAAM,GAAG,EAAE;AAAA,YACxB,gBAAgB,eAAe,MAAM,GAAG,EAAE;AAAA,UAAA,CAC3C;AAAA,QAAA;AAAA,MACH;AAGF,UAAI,SAAS,QAAW;AACtB,aAAK,QAAQ,gBAAgB,IAAI;AAAA,MAAA;AAGnC,aAAO;AAAA,IAAA;AAGT,SAAA,eAAe,MAAqB;AAClC,YAAM,QAAQ,KAAK,aAAA;AACnB,WAAK,MAAA;AACL,aAAO;AAAA,IAAA;AAaT,SAAA,UAAU,CAAC,aAAiD;AAC1D,YAAM,OAAO,KAAK,YAAY,QAAQ;AACtC,UAAI,SAAS,QAAW;AACtB,aAAK,GAAG,IAAI;AACZ,aAAK,UAAU;AAAA,UACb,gBAAgB,KAAK,MAAM,MAAM,iBAAiB;AAAA,QAAA,CACnD;AACD,aAAK,QAAQ,YAAY,MAAM,IAAI;AAAA,MAAA;AAErC,aAAO;AAAA,IAAA;AAOT,SAAA,QAAQ,CACN,gBAAwB,KAAK,MAAM,MAAM,MAAM,QAC/C,aACS;AACT,WAAK,cAAA;AACL,eAAS,IAAI,GAAG,IAAI,eAAe,KAAK;AACtC,aAAK,QAAQ,QAAQ;AAAA,MAAA;AAEvB,WAAK,MAAA;AAAA,IAAM;AAOb,SAAA,eAAe,CAAC,kBAAwD;AACtE,YAAM,QAAQ,KAAK,aAAA;AACnB,WAAK,MAAA;AACL,oBAAc,KAAK;AAAA,IAAA;AAOrB,SAAA,qBAAqB,MAAY;AAC/B,WACG,KAAK,QAAQ,sBAAsB,cAAc,YAClD,KAAK,QAAQ,iBAAiB,eAAe,cAC7C;AACA;AAAA,MAAA;AAGF,YAAM,MAAM,KAAK,IAAA;AACjB,YAAM,iBAAgC,CAAA;AAGtC,eAAS,IAAI,GAAG,IAAI,KAAK,MAAM,MAAM,MAAM,QAAQ,KAAK;AACtD,cAAM,YAAY,KAAK,MAAM,MAAM,eAAe,CAAC;AACnD,YAAI,cAAc,OAAW;AAE7B,cAAM,OAAO,KAAK,MAAM,MAAM,MAAM,CAAC;AACrC,YAAI,SAAS,OAAW;AAExB,cAAM,YACJ,KAAK,QAAQ,iBAAiB,eAAe,eACzC,KAAK,QAAQ,aAAc,MAAM,SAAS,IAC1C,MAAM,aAAa,KAAK,QAAQ,sBAAsB;AAE5D,YAAI,WAAW;AACb,yBAAe,KAAK,CAAC;AAAA,QAAA;AAAA,MACvB;AAIF,eAAS,IAAI,eAAe,SAAS,GAAG,KAAK,GAAG,KAAK;AACnD,cAAM,QAAQ,eAAe,CAAC;AAC9B,YAAI,UAAU,OAAW;AAEzB,cAAM,cAAc,KAAK,MAAM,MAAM,MAAM,KAAK;AAChD,YAAI,gBAAgB,OAAW;AAE/B,cAAM,WAAW,CAAC,GAAG,KAAK,MAAM,MAAM,KAAK;AAC3C,cAAM,gBAAgB,CAAC,GAAG,KAAK,MAAM,MAAM,cAAc;AACzD,iBAAS,OAAO,OAAO,CAAC;AACxB,sBAAc,OAAO,OAAO,CAAC;AAC7B,aAAK,UAAU;AAAA,UACb,OAAO;AAAA,UACP,gBAAgB;AAAA,UAChB,iBAAiB,KAAK,MAAM,MAAM,kBAAkB;AAAA,QAAA,CACrD;AACD,aAAK,QAAQ,WAAW,aAAa,IAAI;AAAA,MAAA;AAG3C,UAAI,eAAe,SAAS,GAAG;AAC7B,aAAK,QAAQ,gBAAgB,IAAI;AAAA,MAAA;AAAA,IACnC;AAYF,SAAA,eAAe,CAAC,WAA0B,YAAgC;AACxE,UAAI,aAAa,SAAS;AACxB,eAAO,KAAK,MA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dist/cjs/queuer.d.cts

@@ -28,2 +28,6 @@ import { Store } from '@tanstack/store';
     /**
+     * Array of items currently waiting to be processed
+     */
+    items: Array<TValue>;
+    /**
      * Timestamps when items were added to the queue for expiration tracking
@@ -33,6 +37,2 @@ */
     /**
-     * Array of items currently waiting to be processed
-     */
-    items: Array<TValue>;
-    /**
      * Whether the queuer has a pending timeout for processing the next item
@@ -98,2 +98,6 @@ */
     /**
+     * Callback fired whenever an item is removed from the queuer
+     */
+    onExecute?: (item: TValue, queuer: Queuer<TValue>) => void;
+    /**
      * Callback fired whenever an item expires in the queuer
@@ -103,6 +107,2 @@ */
     /**
-     * Callback fired whenever an item is removed from the queuer
-     */
-    onExecute?: (item: TValue, queuer: Queuer<TValue>) => void;
-    /**
      * Callback fired whenever an item is added or removed from the queuer
@@ -258,2 +258,7 @@ */
     /**
+     * Processes all items in the queue as a batch using the provided function
+     * The queue is cleared after processing
+     */
+    flushAsBatch: (batchFunction: (items: Array<TValue>) => void) => void;
+    /**
      * Returns the next item in the queue without removing it.
@@ -260,0 +265,0 @@ *

dist/cjs/rate-limiter.cjs

@@ -9,3 +9,5 @@ "use strict";
     executionTimes: [],
-    rejectionCount: 0
+    isExceeded: false,
+    rejectionCount: 0,
+    status: "idle"
   });
@@ -23,2 +25,3 @@ }
     this.store = new store.Store(getDefaultRateLimiterState());
+    this.#timeoutIds = /* @__PURE__ */ new Set();
     this.setOptions = (newOptions) => {
@@ -33,3 +36,9 @@ this.options = { ...this.options, ...newOptions };
         };
-        return combinedState;
+        const isExceeded = combinedState.executionTimes.length >= this.#getLimit();
+        const status = !this.#getEnabled() ? "disabled" : isExceeded ? "exceeded" : "idle";
+        return {
+          ...combinedState,
+          isExceeded,
+          status
+        };
       });
@@ -48,3 +57,3 @@ };
       this.#cleanupOldExecutions();
-      const relevantExecutionTimes = this.#getRelevantExecutionTimes();
+      const relevantExecutionTimes = this.#getExecutionTimesInWindow();
       if (relevantExecutionTimes.length < this.#getLimit()) {
@@ -65,2 +74,3 @@ this.#execute(...args);
       this.store.state.executionTimes.push(now);
+      this.#setCleanupTimeout(now);
       this.#setState({
@@ -71,3 +81,3 @@ executionCount: this.store.state.executionCount + 1
     };
-    this.#getRelevantExecutionTimes = () => {
+    this.#getExecutionTimesInWindow = () => {
       if (this.options.windowType === "sliding") {
@@ -78,20 +88,43 @@ return this.store.state.executionTimes.filter(
       } else {
+        if (this.store.state.executionTimes.length === 0) {
+          return [];
+        }
         const oldestExecution = Math.min(...this.store.state.executionTimes);
         const windowStart = oldestExecution;
+        const windowEnd = windowStart + this.#getWindow();
+        const now = Date.now();
+        if (now > windowEnd) {
+          return [];
+        }
         return this.store.state.executionTimes.filter(
-          (time) => time >= windowStart && time <= windowStart + this.#getWindow()
+          (time) => time >= windowStart && time <= windowEnd
         );
       }
     };
+    this.#setCleanupTimeout = (executionTime) => {
+      if (this.options.windowType === "sliding" || this.#timeoutIds.size === 0) {
+        const now = Date.now();
+        const timeUntilExpiration = executionTime - now + this.#getWindow() + 1;
+        const timeoutId = setTimeout(() => {
+          this.#cleanupOldExecutions();
+          this.#clearTimeout(timeoutId);
+        }, timeUntilExpiration);
+        this.#timeoutIds.add(timeoutId);
+      }
+    };
+    this.#clearTimeout = (timeoutId) => {
+      clearTimeout(timeoutId);
+      this.#timeoutIds.delete(timeoutId);
+    };
+    this.#clearTimeouts = () => {
+      this.#timeoutIds.forEach((timeoutId) => clearTimeout(timeoutId));
+      this.#timeoutIds.clear();
+    };
     this.#cleanupOldExecutions = () => {
-      const now = Date.now();
-      const windowStart = now - this.#getWindow();
       this.#setState({
-        executionTimes: this.store.state.executionTimes.filter(
-          (time) => time > windowStart
-        )
+        executionTimes: this.#getExecutionTimesInWindow()
       });
     };
     this.getRemainingInWindow = () => {
-      const relevantExecutionTimes = this.#getRelevantExecutionTimes();
+      const relevantExecutionTimes = this.#getExecutionTimesInWindow();
       return Math.max(0, this.#getLimit() - relevantExecutionTimes.length);
@@ -108,2 +141,3 @@ };
       this.#setState(getDefaultRateLimiterState());
+      this.#clearTimeouts();
     };
@@ -115,3 +149,7 @@ this.options = {
     this.#setState(this.options.initialState ?? {});
+    for (const executionTime of this.#getExecutionTimesInWindow()) {
+      this.#setCleanupTimeout(executionTime);
+    }
   }
+  #timeoutIds;
   #setState;
@@ -122,3 +160,6 @@ #getEnabled;
   #execute;
-  #getRelevantExecutionTimes;
+  #getExecutionTimesInWindow;
+  #setCleanupTimeout;
+  #clearTimeout;
+  #clearTimeouts;
   #cleanupOldExecutions;
@@ -125,0 +166,0 @@ }

dist/cjs/rate-limiter.cjs.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"rate-limiter.cjs","sources":["../../src/rate-limiter.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { AnyFunction } from './types'\n\nexport interface RateLimiterState {\n  /**\n   * Number of function executions that have been completed\n   */\n  executionCount: number\n  /**\n   * Array of timestamps when executions occurred for rate limiting calculations\n   */\n  executionTimes: Array<number>\n  /**\n   * Number of function executions that have been rejected due to rate limiting\n   */\n  rejectionCount: number\n}\n\nfunction getDefaultRateLimiterState(): RateLimiterState {\n  return structuredClone({\n    executionCount: 0,\n    executionTimes: [],\n    rejectionCount: 0,\n  })\n}\n\n/**\n * Options for configuring a rate-limited function\n */\nexport interface RateLimiterOptions<TFn extends AnyFunction> {\n  /**\n   * Whether the rate limiter is enabled. When disabled, maybeExecute will not trigger any executions.\n   * Defaults to true.\n   */\n  enabled?: boolean | ((rateLimiter: RateLimiter<TFn>) => boolean)\n  /**\n   * Initial state for the rate limiter\n   */\n  initialState?: Partial<RateLimiterState>\n  /**\n   * Maximum number of executions allowed within the time window.\n   * Can be a number or a callback function that receives the rate limiter instance and returns a number.\n   */\n  limit: number | ((rateLimiter: RateLimiter<TFn>) => number)\n  /**\n   * Callback function that is called after the function is executed\n   */\n  onExecute?: (rateLimiter: RateLimiter<TFn>) => void\n  /**\n   * Optional callback function that is called when an execution is rejected due to rate limiting\n   */\n  onReject?: (rateLimiter: RateLimiter<TFn>) => void\n  /**\n   * Time window in milliseconds within which the limit applies.\n   * Can be a number or a callback function that receives the rate limiter instance and returns a number.\n   */\n  window: number | ((rateLimiter: RateLimiter<TFn>) => number)\n  /**\n   * Type of window to use for rate limiting\n   * - 'fixed': Uses a fixed window that resets after the window period\n   * - 'sliding': Uses a sliding window that allows executions as old ones expire\n   * Defaults to 'fixed'\n   */\n  windowType?: 'fixed' | 'sliding'\n}\n\nconst defaultOptions: Omit<\n  Required<RateLimiterOptions<any>>,\n  'initialState' | 'onExecute' | 'onReject'\n> = {\n  enabled: true,\n  limit: 1,\n  window: 0,\n  windowType: 'fixed',\n}\n\n/**\n * A class that creates a rate-limited function.\n *\n * Rate limiting is a simple approach that allows a function to execute up to a limit within a time window,\n * then blocks all subsequent calls until the window passes. This can lead to \"bursty\" behavior where\n * all executions happen immediately, followed by a complete block.\n *\n * The rate limiter supports two types of windows:\n * - 'fixed': A strict window that resets after the window period. All executions within the window count\n *   towards the limit, and the window resets completely after the period.\n * - 'sliding': A rolling window that allows executions as old ones expire. This provides a more\n *   consistent rate of execution over time.\n *\n * For smoother execution patterns, consider using:\n * - Throttling: Ensures consistent spacing between executions (e.g. max once per 200ms)\n * - Debouncing: Waits for a pause in calls before executing (e.g. after 500ms of no calls)\n *\n * Rate limiting is best used for hard API limits or resource constraints. For UI updates or\n * smoothing out frequent events, throttling or debouncing usually provide better user experience.\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the rate limiter\n * - Use `onExecute` callback to react to function execution and implement custom logic\n * - Use `onReject` callback to react to executions being rejected when rate limit is exceeded\n * - The state includes execution count, execution times, and rejection count\n * - State can be accessed via `rateLimiter.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `rateLimiter.state`\n *\n * @example\n * ```ts\n * const rateLimiter = new RateLimiter(\n *   (id: string) => api.getData(id),\n *   {\n *     limit: 5,\n *     window: 1000,\n *     windowType: 'sliding',\n *   }\n * );\n *\n * // Will execute immediately until limit reached, then block\n * rateLimiter.maybeExecute('123');\n * ```\n */\nexport class RateLimiter<TFn extends AnyFunction> {\n  readonly store: Store<Readonly<RateLimiterState>> =\n    new Store<RateLimiterState>(getDefaultRateLimiterState())\n  options: RateLimiterOptions<TFn>\n\n  constructor(\n    private fn: TFn,\n    initialOptions: RateLimiterOptions<TFn>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the rate limiter options\n   */\n  setOptions = (newOptions: Partial<RateLimiterOptions<TFn>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<RateLimiterState>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      return combinedState\n    })\n  }\n\n  /**\n   * Returns the current enabled state of the rate limiter\n   */\n  #getEnabled = (): boolean => {\n    return !!parseFunctionOrValue(this.options.enabled, this)\n  }\n\n  /**\n   * Returns the current limit of executions allowed within the time window\n   */\n  #getLimit = (): number => {\n    return parseFunctionOrValue(this.options.limit, this)\n  }\n\n  /**\n   * Returns the current time window in milliseconds\n   */\n  #getWindow = (): number => {\n    return parseFunctionOrValue(this.options.window, this)\n  }\n\n  /**\n   * Attempts to execute the rate-limited function if within the configured limits.\n   * Will reject execution if the number of calls in the current window exceeds the limit.\n   *\n   * @example\n   * ```ts\n   * const rateLimiter = new RateLimiter(fn, { limit: 5, window: 1000 });\n   *\n   * // First 5 calls will return true\n   * rateLimiter.maybeExecute('arg1', 'arg2'); // true\n   *\n   * // Additional calls within the window will return false\n   * rateLimiter.maybeExecute('arg1', 'arg2'); // false\n   * ```\n   */\n  maybeExecute = (...args: Parameters<TFn>): boolean => {\n    this.#cleanupOldExecutions()\n\n    const relevantExecutionTimes = this.#getRelevantExecutionTimes()\n\n    if (relevantExecutionTimes.length < this.#getLimit()) {\n      this.#execute(...args)\n      return true\n    }\n\n    this.#setState({\n      rejectionCount: this.store.state.rejectionCount + 1,\n    })\n    this.options.onReject?.(this)\n    return false\n  }\n\n  #execute = (...args: Parameters<TFn>): void => {\n    if (!this.#getEnabled()) return\n    const now = Date.now()\n    this.fn(...args) // EXECUTE!\n    this.store.state.executionTimes.push(now) // mutate state directly for performance\n    this.#setState({\n      executionCount: this.store.state.executionCount + 1,\n    })\n    this.options.onExecute?.(this)\n  }\n\n  #getRelevantExecutionTimes = (): Array<number> => {\n    if (this.options.windowType === 'sliding') {\n      // For sliding window, return all executions within the current window\n      return this.store.state.executionTimes.filter(\n        (time) => time > Date.now() - this.#getWindow(),\n      )\n    } else {\n      // For fixed window, return all executions in the current window\n      // The window starts from the oldest execution time\n      const oldestExecution = Math.min(...this.store.state.executionTimes)\n      const windowStart = oldestExecution\n      return this.store.state.executionTimes.filter(\n        (time) =>\n          time >= windowStart && time <= windowStart + this.#getWindow(),\n      )\n    }\n  }\n\n  #cleanupOldExecutions = (): void => {\n    const now = Date.now()\n    const windowStart = now - this.#getWindow()\n    this.#setState({\n      executionTimes: this.store.state.executionTimes.filter(\n        (time) => time > windowStart,\n      ),\n    })\n  }\n\n  /**\n   * Returns the number of remaining executions allowed in the current window\n   */\n  getRemainingInWindow = (): number => {\n    const relevantExecutionTimes = this.#getRelevantExecutionTimes()\n    return Math.max(0, this.#getLimit() - relevantExecutionTimes.length)\n  }\n\n  /**\n   * Returns the number of milliseconds until the next execution will be possible\n   */\n  getMsUntilNextWindow = (): number => {\n    if (this.getRemainingInWindow() > 0) {\n      return 0\n    }\n    const oldestExecution = this.store.state.executionTimes[0] ?? Infinity\n    return oldestExecution + this.#getWindow() - Date.now()\n  }\n\n  /**\n   * Resets the rate limiter state\n   */\n  reset = (): void => {\n    this.#setState(getDefaultRateLimiterState())\n  }\n}\n\n/**\n * Creates a rate-limited function that will execute the provided function up to a maximum number of times within a time window.\n *\n * Note that rate limiting is a simpler form of execution control compared to throttling or debouncing:\n * - A rate limiter will allow all executions until the limit is reached, then block all subsequent calls until the window resets\n * - A throttler ensures even spacing between executions, which can be better for consistent performance\n * - A debouncer collapses multiple calls into one, which is better for handling bursts of events\n *\n * The rate limiter supports two types of windows:\n * - 'fixed': A strict window that resets after the window period. All executions within the window count\n *   towards the limit, and the window resets completely after the period.\n * - 'sliding': A rolling window that allows executions as old ones expire. This provides a more\n *   consistent rate of execution over time.\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the rate limiter\n * - Use `onExecute` callback to react to function execution and implement custom logic\n * - Use `onReject` callback to react to executions being rejected when rate limit is exceeded\n * - The state includes execution count, execution times, and rejection count\n * - State can be accessed via the underlying RateLimiter instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * Consider using throttle() or debounce() if you need more intelligent execution control. Use rate limiting when you specifically\n * need to enforce a hard limit on the number of executions within a time period.\n *\n * @example\n * ```ts\n * // Rate limit to 5 calls per minute with a sliding window\n * const rateLimited = rateLimit(makeApiCall, {\n *   limit: 5,\n *   window: 60000,\n *   windowType: 'sliding',\n *   onReject: (rateLimiter) => {\n *     console.log(`Rate limit exceeded. 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+{"version":3,"file":"rate-limiter.cjs","sources":["../../src/rate-limiter.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { AnyFunction } from './types'\n\nexport interface RateLimiterState {\n  /**\n   * Number of function executions that have been completed\n   */\n  executionCount: number\n  /**\n   * Array of timestamps when executions occurred for rate limiting calculations\n   */\n  executionTimes: Array<number>\n  /**\n   * Whether the rate limiter has exceeded the limit\n   */\n  isExceeded: boolean\n  /**\n   * Number of function executions that have been rejected due to rate limiting\n   */\n  rejectionCount: number\n  /**\n   * Current execution status - 'disabled' when not active, 'executing' when executing, 'idle' when not executing, 'exceeded' when rate limit is exceeded\n   */\n  status: 'disabled' | 'exceeded' | 'idle'\n}\n\nfunction getDefaultRateLimiterState(): RateLimiterState {\n  return structuredClone({\n    executionCount: 0,\n    executionTimes: [],\n    isExceeded: false,\n    rejectionCount: 0,\n    status: 'idle',\n  })\n}\n\n/**\n * Options for configuring a rate-limited function\n */\nexport interface RateLimiterOptions<TFn extends AnyFunction> {\n  /**\n   * Whether the rate limiter is enabled. When disabled, maybeExecute will not trigger any executions.\n   * Defaults to true.\n   */\n  enabled?: boolean | ((rateLimiter: RateLimiter<TFn>) => boolean)\n  /**\n   * Initial state for the rate limiter\n   */\n  initialState?: Partial<RateLimiterState>\n  /**\n   * Maximum number of executions allowed within the time window.\n   * Can be a number or a callback function that receives the rate limiter instance and returns a number.\n   */\n  limit: number | ((rateLimiter: RateLimiter<TFn>) => number)\n  /**\n   * Callback function that is called after the function is executed\n   */\n  onExecute?: (rateLimiter: RateLimiter<TFn>) => void\n  /**\n   * Optional callback function that is called when an execution is rejected due to rate limiting\n   */\n  onReject?: (rateLimiter: RateLimiter<TFn>) => void\n  /**\n   * Time window in milliseconds within which the limit applies.\n   * Can be a number or a callback function that receives the rate limiter instance and returns a number.\n   */\n  window: number | ((rateLimiter: RateLimiter<TFn>) => number)\n  /**\n   * Type of window to use for rate limiting\n   * - 'fixed': Uses a fixed window that resets after the window period\n   * - 'sliding': Uses a sliding window that allows executions as old ones expire\n   * Defaults to 'fixed'\n   */\n  windowType?: 'fixed' | 'sliding'\n}\n\nconst defaultOptions: Omit<\n  Required<RateLimiterOptions<any>>,\n  'initialState' | 'onExecute' | 'onReject'\n> = {\n  enabled: true,\n  limit: 1,\n  window: 0,\n  windowType: 'fixed',\n}\n\n/**\n * A class that creates a rate-limited function.\n *\n * Rate limiting is a simple approach that allows a function to execute up to a limit within a time window,\n * then blocks all subsequent calls until the window passes. This can lead to \"bursty\" behavior where\n * all executions happen immediately, followed by a complete block.\n *\n * The rate limiter supports two types of windows:\n * - 'fixed': A strict window that resets after the window period. All executions within the window count\n *   towards the limit, and the window resets completely after the period.\n * - 'sliding': A rolling window that allows executions as old ones expire. This provides a more\n *   consistent rate of execution over time.\n *\n * For smoother execution patterns, consider using:\n * - Throttling: Ensures consistent spacing between executions (e.g. max once per 200ms)\n * - Debouncing: Waits for a pause in calls before executing (e.g. after 500ms of no calls)\n *\n * Rate limiting is best used for hard API limits or resource constraints. For UI updates or\n * smoothing out frequent events, throttling or debouncing usually provide better user experience.\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the rate limiter\n * - Use `onExecute` callback to react to function execution and implement custom logic\n * - Use `onReject` callback to react to executions being rejected when rate limit is exceeded\n * - The state includes execution count, execution times, and rejection count\n * - State can be accessed via `rateLimiter.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `rateLimiter.state`\n *\n * @example\n * ```ts\n * const rateLimiter = new RateLimiter(\n *   (id: string) => api.getData(id),\n *   {\n *     limit: 5,\n *     window: 1000,\n *     windowType: 'sliding',\n *   }\n * );\n *\n * // Will execute immediately until limit reached, then block\n * rateLimiter.maybeExecute('123');\n * ```\n */\nexport class RateLimiter<TFn extends AnyFunction> {\n  readonly store: Store<Readonly<RateLimiterState>> =\n    new Store<RateLimiterState>(getDefaultRateLimiterState())\n  options: RateLimiterOptions<TFn>\n  #timeoutIds: Set<NodeJS.Timeout> = new Set()\n\n  constructor(\n    private fn: TFn,\n    initialOptions: RateLimiterOptions<TFn>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n    }\n    this.#setState(this.options.initialState ?? {})\n    for (const executionTime of this.#getExecutionTimesInWindow()) {\n      this.#setCleanupTimeout(executionTime)\n    }\n  }\n\n  /**\n   * Updates the rate limiter options\n   */\n  setOptions = (newOptions: Partial<RateLimiterOptions<TFn>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<RateLimiterState>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const isExceeded = combinedState.executionTimes.length >= this.#getLimit()\n      const status = !this.#getEnabled()\n        ? 'disabled'\n        : isExceeded\n          ? 'exceeded'\n          : 'idle'\n      return {\n        ...combinedState,\n        isExceeded,\n        status,\n      }\n    })\n  }\n\n  /**\n   * Returns the current enabled state of the rate limiter\n   */\n  #getEnabled = (): boolean => {\n    return !!parseFunctionOrValue(this.options.enabled, this)\n  }\n\n  /**\n   * Returns the current limit of executions allowed within the time window\n   */\n  #getLimit = (): number => {\n    return parseFunctionOrValue(this.options.limit, this)\n  }\n\n  /**\n   * Returns the current time window in milliseconds\n   */\n  #getWindow = (): number => {\n    return parseFunctionOrValue(this.options.window, this)\n  }\n\n  /**\n   * Attempts to execute the rate-limited function if within the configured limits.\n   * Will reject execution if the number of calls in the current window exceeds the limit.\n   *\n   * @example\n   * ```ts\n   * const rateLimiter = new RateLimiter(fn, { limit: 5, window: 1000 });\n   *\n   * // First 5 calls will return true\n   * rateLimiter.maybeExecute('arg1', 'arg2'); // true\n   *\n   * // Additional calls within the window will return false\n   * rateLimiter.maybeExecute('arg1', 'arg2'); // false\n   * ```\n   */\n  maybeExecute = (...args: Parameters<TFn>): boolean => {\n    this.#cleanupOldExecutions()\n\n    const relevantExecutionTimes = this.#getExecutionTimesInWindow()\n\n    if (relevantExecutionTimes.length < this.#getLimit()) {\n      this.#execute(...args)\n      return true\n    }\n\n    this.#setState({\n      rejectionCount: this.store.state.rejectionCount + 1,\n    })\n    this.options.onReject?.(this)\n    return false\n  }\n\n  #execute = (...args: Parameters<TFn>): void => {\n    if (!this.#getEnabled()) return\n    const now = Date.now()\n    this.fn(...args) // EXECUTE!\n    this.store.state.executionTimes.push(now) // mutate state directly for performance\n\n    this.#setCleanupTimeout(now)\n\n    this.#setState({\n      executionCount: this.store.state.executionCount + 1,\n    })\n    this.options.onExecute?.(this)\n  }\n\n  #getExecutionTimesInWindow = (): Array<number> => {\n    if (this.options.windowType === 'sliding') {\n      // For sliding window, return all executions within the current window\n      return this.store.state.executionTimes.filter(\n        (time) => time > Date.now() - this.#getWindow(),\n      )\n    } else {\n      // For fixed window, return all executions in the current window\n      // The window starts from the oldest execution time\n      if (this.store.state.executionTimes.length === 0) {\n        return []\n      }\n      const oldestExecution = Math.min(...this.store.state.executionTimes)\n      const windowStart = oldestExecution\n      const windowEnd = windowStart + this.#getWindow()\n      const now = Date.now()\n\n      // If the window has expired, return empty array\n      if (now > windowEnd) {\n        return []\n      }\n\n      // Otherwise, return all executions in the current window\n      return this.store.state.executionTimes.filter(\n        (time) => time >= windowStart && time <= windowEnd,\n      )\n    }\n  }\n\n  #setCleanupTimeout = (executionTime: number): void => {\n    if (\n      this.options.windowType === 'sliding' ||\n      this.#timeoutIds.size === 0 // new fixed window\n    ) {\n      const now = Date.now()\n      const timeUntilExpiration = executionTime - now + this.#getWindow() + 1\n      const timeoutId = setTimeout(() => {\n        this.#cleanupOldExecutions()\n        this.#clearTimeout(timeoutId)\n      }, timeUntilExpiration)\n      this.#timeoutIds.add(timeoutId)\n    }\n  }\n\n  #clearTimeout = (timeoutId: NodeJS.Timeout): void => {\n    clearTimeout(timeoutId)\n    this.#timeoutIds.delete(timeoutId)\n  }\n\n  #clearTimeouts = (): void => {\n    this.#timeoutIds.forEach((timeoutId) => clearTimeout(timeoutId))\n    this.#timeoutIds.clear()\n  }\n\n  #cleanupOldExecutions = (): void => {\n    this.#setState({\n      executionTimes: this.#getExecutionTimesInWindow(),\n    })\n  }\n\n  /**\n   * Returns the number of remaining executions allowed in the current window\n   */\n  getRemainingInWindow = (): number => {\n    const relevantExecutionTimes = this.#getExecutionTimesInWindow()\n    return Math.max(0, this.#getLimit() - relevantExecutionTimes.length)\n  }\n\n  /**\n   * Returns the number of milliseconds until the next execution will be possible\n   */\n  getMsUntilNextWindow = (): number => {\n    if (this.getRemainingInWindow() > 0) {\n      return 0\n    }\n    const oldestExecution = this.store.state.executionTimes[0] ?? Infinity\n    return oldestExecution + this.#getWindow() - Date.now()\n  }\n\n  /**\n   * Resets the rate limiter state\n   */\n  reset = (): void => {\n    this.#setState(getDefaultRateLimiterState())\n    this.#clearTimeouts()\n  }\n}\n\n/**\n * Creates a rate-limited function that will execute the provided function up to a maximum number of times within a time window.\n *\n * Note that rate limiting is a simpler form of execution control compared to throttling or debouncing:\n * - A rate limiter will allow all executions until the limit is reached, then block all subsequent calls until the window resets\n * - A throttler ensures even spacing between executions, which can be better for consistent performance\n * - A debouncer collapses multiple calls into one, which is better for handling bursts of events\n *\n * The rate limiter supports two types of windows:\n * - 'fixed': A strict window that resets after the window period. All executions within the window count\n *   towards the limit, and the window resets completely after the period.\n * - 'sliding': A rolling window that allows executions as old ones expire. This provides a more\n *   consistent rate of execution over time.\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the rate limiter\n * - Use `onExecute` callback to react to function execution and implement custom logic\n * - Use `onReject` callback to react to executions being rejected when rate limit is exceeded\n * - The state includes execution count, execution times, and rejection count\n * - State can be accessed via the underlying RateLimiter instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * Consider using throttle() or debounce() if you need more intelligent execution control. Use rate limiting when you specifically\n * need to enforce a hard limit on the number of executions within a time period.\n *\n * @example\n * ```ts\n * // Rate limit to 5 calls per minute with a sliding window\n * const rateLimited = rateLimit(makeApiCall, {\n *   limit: 5,\n *   window: 60000,\n *   windowType: 'sliding',\n *   onReject: (rateLimiter) => {\n *     console.log(`Rate limit exceeded. 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dist/cjs/rate-limiter.d.cts

@@ -13,5 +13,13 @@ import { Store } from '@tanstack/store';
     /**
+     * Whether the rate limiter has exceeded the limit
+     */
+    isExceeded: boolean;
+    /**
      * Number of function executions that have been rejected due to rate limiting
      */
     rejectionCount: number;
+    /**
+     * Current execution status - 'disabled' when not active, 'executing' when executing, 'idle' when not executing, 'exceeded' when rate limit is exceeded
+     */
+    status: 'disabled' | 'exceeded' | 'idle';
 }
@@ -18,0 +26,0 @@ /**

dist/cjs/throttler.cjs.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"throttler.cjs","sources":["../../src/throttler.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { AnyFunction } from './types'\n\nexport interface ThrottlerState<TFn extends AnyFunction> {\n  /**\n   * Number of function executions that have been completed\n   */\n  executionCount: number\n  /**\n   * The arguments from the most recent call to maybeExecute\n   */\n  lastArgs: Parameters<TFn> | undefined\n  /**\n   * Timestamp of the last function execution in milliseconds\n   */\n  lastExecutionTime: number\n  /**\n   * Timestamp when the next execution can occur in milliseconds\n   */\n  nextExecutionTime: number\n  /**\n   * Whether the throttler is waiting for the timeout to trigger execution\n   */\n  isPending: boolean\n  /**\n   * Current execution status - 'idle' when not active, 'pending' when waiting for timeout\n   */\n  status: 'disabled' | 'idle' | 'pending'\n}\n\nfunction getDefaultThrottlerState<\n  TFn extends AnyFunction,\n>(): ThrottlerState<TFn> {\n  return structuredClone({\n    executionCount: 0,\n    isPending: false,\n    lastArgs: undefined,\n    lastExecutionTime: 0,\n    nextExecutionTime: 0,\n    status: 'idle',\n  })\n}\n\n/**\n * Options for configuring a throttled function\n */\nexport interface ThrottlerOptions<TFn extends AnyFunction> {\n  /**\n   * Whether the throttler is enabled. 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'disabled'\n          : isPending\n            ? 'pending'\n            : 'idle',\n      }\n    })\n  }\n\n  #getEnabled = (): boolean => {\n    return !!parseFunctionOrValue(this.options.enabled, this)\n  }\n\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait, this)\n  }\n\n  /**\n   * Attempts to execute the throttled function. 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+{"version":3,"file":"throttler.cjs","sources":["../../src/throttler.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { AnyFunction } from './types'\n\nexport interface ThrottlerState<TFn extends AnyFunction> {\n  /**\n   * Number of function executions that have been completed\n   */\n  executionCount: number\n  /**\n   * Whether the throttler is waiting for the timeout to trigger execution\n   */\n  isPending: boolean\n  /**\n   * The arguments from the most recent call to maybeExecute\n   */\n  lastArgs: Parameters<TFn> | undefined\n  /**\n   * Timestamp of the last function execution in milliseconds\n   */\n  lastExecutionTime: number\n  /**\n   * Timestamp when the next execution can occur in milliseconds\n   */\n  nextExecutionTime: number\n  /**\n   * Current execution status - 'idle' when not active, 'pending' when waiting for timeout\n   */\n  status: 'disabled' | 'idle' | 'pending'\n}\n\nfunction getDefaultThrottlerState<\n  TFn extends AnyFunction,\n>(): ThrottlerState<TFn> {\n  return structuredClone({\n    executionCount: 0,\n    isPending: false,\n    lastArgs: undefined,\n    lastExecutionTime: 0,\n    nextExecutionTime: 0,\n    status: 'idle',\n  })\n}\n\n/**\n * Options for configuring a throttled function\n */\nexport interface ThrottlerOptions<TFn extends AnyFunction> {\n  /**\n   * Whether the throttler is enabled. When disabled, maybeExecute will not trigger any executions.\n   * Can be a boolean or a function that returns a boolean.\n   * Defaults to true.\n   */\n  enabled?: boolean | ((throttler: Throttler<TFn>) => boolean)\n  /**\n   * Initial state for the throttler\n   */\n  initialState?: Partial<ThrottlerState<TFn>>\n  /**\n   * Whether to execute on the leading edge of the timeout.\n   * Defaults to true.\n   */\n  leading?: boolean\n  /**\n   * Callback function that is called after the function is executed\n   */\n  onExecute?: (throttler: Throttler<TFn>) => void\n  /**\n   * Whether to execute on the trailing edge of the timeout.\n   * Defaults to true.\n   */\n  trailing?: boolean\n  /**\n   * Time window in milliseconds during which the function can only be executed once.\n   * Can be a number or a function that returns a number.\n   * Defaults to 0ms\n   */\n  wait: number | ((throttler: Throttler<TFn>) => number)\n}\n\nconst defaultOptions: Omit<\n  Required<ThrottlerOptions<any>>,\n  'initialState' | 'onExecute'\n> = {\n  enabled: true,\n  leading: true,\n  trailing: true,\n  wait: 0,\n}\n\n/**\n * A class that creates a throttled function.\n *\n * Throttling ensures a function is called at most once within a specified time window.\n * Unlike debouncing which waits for a pause in calls, throttling guarantees consistent\n * execution timing regardless of call frequency.\n *\n * Supports both leading and trailing edge execution:\n * - Leading: Execute immediately on first call (default: true)\n * - Trailing: Execute after wait period if called during throttle (default: true)\n *\n * For collapsing rapid-fire events where you only care about the last call, consider using Debouncer.\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the throttler\n * - Use `onExecute` callback to react to function execution and implement custom logic\n * - The state includes execution count, last execution time, pending status, and more\n * - State can be accessed via `throttler.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `throttler.state`\n *\n * @example\n * ```ts\n * const throttler = new Throttler(\n *   (id: string) => api.getData(id),\n *   { wait: 1000 } // Execute at most once per second\n * );\n *\n * // First call executes immediately\n * throttler.maybeExecute('123');\n *\n * // Subsequent calls within 1000ms are throttled\n * throttler.maybeExecute('123'); // Throttled\n * ```\n */\nexport class Throttler<TFn extends AnyFunction> {\n  readonly store: Store<Readonly<ThrottlerState<TFn>>> = new Store(\n    getDefaultThrottlerState(),\n  )\n  options: ThrottlerOptions<TFn>\n  #timeoutId: NodeJS.Timeout | undefined\n\n  constructor(\n    private fn: TFn,\n    initialOptions: ThrottlerOptions<TFn>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the throttler options\n   */\n  setOptions = (newOptions: Partial<ThrottlerOptions<TFn>>): void => {\n    this.options = { ...this.options, ...newOptions }\n\n    // Cancel pending execution if the throttler is disabled\n    if (!this.#getEnabled()) {\n      this.cancel()\n    }\n  }\n\n  #setState = (newState: Partial<ThrottlerState<TFn>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const { isPending } = combinedState\n      return {\n        ...combinedState,\n        status: !this.#getEnabled()\n          ? 'disabled'\n          : isPending\n            ? 'pending'\n            : 'idle',\n      }\n    })\n  }\n\n  #getEnabled = (): boolean => {\n    return !!parseFunctionOrValue(this.options.enabled, this)\n  }\n\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait, this)\n  }\n\n  /**\n   * Attempts to execute the throttled function. The execution behavior depends on the throttler options:\n   *\n   * - If enough time has passed since the last execution (>= wait period):\n   *   - With leading=true: Executes immediately\n   *   - With leading=false: Waits for the next trailing execution\n   *\n   * - If within the wait period:\n   *   - With trailing=true: Schedules execution for end of wait period\n   *   - With trailing=false: Drops the execution\n   *\n   * @example\n   * ```ts\n   * const throttled = new Throttler(fn, { wait: 1000 });\n   *\n   * // First call executes immediately\n   * throttled.maybeExecute('a', 'b');\n   *\n   * // Call during wait period - gets throttled\n   * throttled.maybeExecute('c', 'd');\n   * ```\n   */\n  maybeExecute = (...args: Parameters<TFn>): void => {\n    const now = Date.now()\n    const timeSinceLastExecution = now - this.store.state.lastExecutionTime\n    const wait = this.#getWait()\n\n    // Handle leading execution\n    if (this.options.leading && timeSinceLastExecution >= wait) {\n      this.#execute(...args)\n    } else {\n      // Store the most recent arguments for potential trailing execution\n      this.#setState({\n        lastArgs: args,\n      })\n      // Set up trailing execution if not already scheduled\n      if (!this.#timeoutId && this.options.trailing) {\n        // prevent large number if lastExecutionTime is undefined\n        const _timeSinceLastExecution = this.store.state.lastExecutionTime\n          ? now - this.store.state.lastExecutionTime\n          : 0\n        const timeoutDuration = wait - _timeSinceLastExecution\n        this.#setState({ isPending: true })\n        this.#timeoutId = setTimeout(() => {\n          const { lastArgs } = this.store.state\n          if (lastArgs !== undefined) {\n            this.#execute(...lastArgs)\n          }\n        }, timeoutDuration)\n      }\n    }\n  }\n\n  #execute = (...args: Parameters<TFn>): void => {\n    if (!this.#getEnabled()) return\n    this.fn(...args) // EXECUTE!\n    const lastExecutionTime = Date.now()\n    const nextExecutionTime = lastExecutionTime + this.#getWait()\n    this.#clearTimeout()\n    this.#setState({\n      executionCount: this.store.state.executionCount + 1,\n      lastExecutionTime,\n      nextExecutionTime,\n      isPending: false,\n      lastArgs: undefined,\n    })\n    this.options.onExecute?.(this)\n  }\n\n  /**\n   * Processes the current pending execution immediately\n   */\n  flush = (): void => {\n    if (this.store.state.isPending && this.store.state.lastArgs) {\n      this.#execute(...this.store.state.lastArgs)\n    }\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = undefined\n    }\n  }\n\n  /**\n   * Cancels any pending trailing execution and clears internal state.\n   *\n   * If a trailing execution is scheduled (due to throttling with trailing=true),\n   * this will prevent that execution from occurring. The internal timeout and\n   * stored arguments will be cleared.\n   *\n   * Has no effect if there is no pending execution.\n   */\n  cancel = (): void => {\n    this.#clearTimeout()\n    this.#setState({\n      lastArgs: undefined,\n      isPending: false,\n    })\n  }\n\n  /**\n   * Resets the throttler state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultThrottlerState<TFn>())\n  }\n}\n\n/**\n * Creates a throttled function that limits how often the provided function can execute.\n *\n * Throttling ensures a function executes at most once within a specified time window,\n * regardless of how many times it is called. This is useful for rate-limiting\n * expensive operations or UI updates.\n *\n * The throttled function can be configured to execute on the leading and/or trailing\n * edge of the throttle window via options.\n *\n * For handling bursts of events, consider using debounce() instead. 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dist/cjs/throttler.d.cts

@@ -9,2 +9,6 @@ import { Store } from '@tanstack/store';
     /**
+     * Whether the throttler is waiting for the timeout to trigger execution
+     */
+    isPending: boolean;
+    /**
      * The arguments from the most recent call to maybeExecute
@@ -22,6 +26,2 @@ */
     /**
-     * Whether the throttler is waiting for the timeout to trigger execution
-     */
-    isPending: boolean;
-    /**
      * Current execution status - 'idle' when not active, 'pending' when waiting for timeout
@@ -28,0 +28,0 @@ */

dist/esm/async-batcher.d.ts

@@ -25,6 +25,2 @@ import { Store } from '@tanstack/store';
     /**
-     * Whether the batcher is active and will process items automatically
-     */
-    isRunning: boolean;
-    /**
      * Array of items currently queued for batch processing
@@ -54,9 +50,9 @@ */
     /**
+     * Total number of items that have failed processing across all batches
+     */
+    totalItemsFailed: number;
+    /**
      * Total number of items that have been processed across all batches
      */
     totalItemsProcessed: number;
-    /**
-     * Total number of items that have failed processing across all batches
-     */
-    totalItemsFailed: number;
 }
@@ -204,10 +200,2 @@ /**
     /**
-     * Stops the async batcher from processing batches
-     */
-    stop: () => void;
-    /**
-     * Starts the async batcher and processes any pending items
-     */
-    start: () => void;
-    /**
      * Returns a copy of all items in the async batcher
@@ -214,0 +202,0 @@ */

dist/esm/async-batcher.js

@@ -10,3 +10,2 @@ import { Store } from "@tanstack/store";
     isPending: false,
-    isRunning: true,
     items: [],
@@ -68,3 +67,3 @@ lastResult: void 0,
         this.#execute();
-      } else if (this.store.state.isRunning && this.options.wait !== Infinity) {
+      } else if (this.options.wait !== Infinity) {
         this.#clearTimeout();
@@ -115,12 +114,2 @@ this.#timeoutId = setTimeout(() => this.#execute(), this.#getWait());
     };
-    this.stop = () => {
-      this.#setState({ isRunning: false });
-      this.#clearTimeout();
-    };
-    this.start = () => {
-      this.#setState({ isRunning: true });
-      if (this.store.state.items.length > 0 && !this.#timeoutId) {
-        this.#timeoutId = setTimeout(() => this.#execute(), this.#getWait());
-      }
-    };
     this.peekAllItems = () => {
@@ -127,0 +116,0 @@ return [...this.store.state.items];

dist/esm/async-batcher.js.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"async-batcher.js","sources":["../../src/async-batcher.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { OptionalKeys } from './types'\n\nexport interface AsyncBatcherState<TValue> {\n  /**\n   * Number of batch executions that have resulted in errors\n   */\n  errorCount: number\n  /**\n   * Array of items that failed during batch processing\n   */\n  failedItems: Array<TValue>\n  /**\n   * Whether the batcher has no items to process (items array is empty)\n   */\n  isEmpty: boolean\n  /**\n   * Whether a batch is currently being processed asynchronously\n   */\n  isExecuting: boolean\n  /**\n   * Whether the batcher is waiting for the timeout to trigger batch processing\n   */\n  isPending: boolean\n  /**\n   * Whether the batcher is active and will process items automatically\n   */\n  isRunning: boolean\n  /**\n   * Array of items currently queued for batch processing\n   */\n  items: Array<TValue>\n  /**\n   * The result from the most recent batch execution\n   */\n  lastResult: any\n  /**\n   * Number of batch executions that have completed (either successfully or with errors)\n   */\n  settleCount: number\n  /**\n   * Number of items currently in the batch queue\n   */\n  size: number\n  /**\n   * Current processing status - 'idle' when not processing, 'pending' when waiting for timeout, 'executing' when processing, 'populated' when items are present, but no wait is configured\n   */\n  status: 'idle' | 'pending' | 'executing' | 'populated'\n  /**\n   * Number of batch executions that have completed successfully\n   */\n  successCount: number\n  /**\n   * Total number of items that have been processed across all batches\n   */\n  totalItemsProcessed: number\n  /**\n   * Total number of items that have failed processing across all batches\n   */\n  totalItemsFailed: number\n}\n\nfunction getDefaultAsyncBatcherState<TValue>(): AsyncBatcherState<TValue> {\n  return {\n    errorCount: 0,\n    failedItems: [],\n    isEmpty: true,\n    isExecuting: false,\n    isPending: false,\n    isRunning: true,\n    items: [],\n    lastResult: undefined,\n    settleCount: 0,\n    size: 0,\n    status: 'idle',\n    successCount: 0,\n    totalItemsProcessed: 0,\n    totalItemsFailed: 0,\n  }\n}\n\n/**\n * Options for configuring an AsyncBatcher instance\n */\nexport interface AsyncBatcherOptions<TValue> {\n  /**\n   * Custom function to determine if a batch should be processed\n   * Return true to process the batch immediately\n   */\n  getShouldExecute?: (\n    items: Array<TValue>,\n    batcher: AsyncBatcher<TValue>,\n  ) => boolean\n  /**\n   * Initial state for the async batcher\n   */\n  initialState?: Partial<AsyncBatcherState<TValue>>\n  /**\n   * Maximum number of items in a batch\n   * @default Infinity\n   */\n  maxSize?: number\n  /**\n   * Optional error handler for when the batch function throws.\n   * If provided, the handler will be called with the error and batcher instance.\n   * This can be used alongside throwOnError - the handler will be called before any error is thrown.\n   */\n  onError?: (\n    error: unknown,\n    failedItems: Array<TValue>,\n    batcher: AsyncBatcher<TValue>,\n  ) => void\n  /**\n   * Callback fired after a batch is processed\n   */\n  onExecute?: (batcher: AsyncBatcher<TValue>) => void\n  /**\n   * Callback fired after items are added to the batcher\n   */\n  onItemsChange?: (batcher: AsyncBatcher<TValue>) => void\n  /**\n   * Optional callback to call when a batch is settled (completed or failed)\n   */\n  onSettled?: (batcher: AsyncBatcher<TValue>) => void\n  /**\n   * Optional callback to call when a batch succeeds\n   */\n  onSuccess?: (result: any, batcher: AsyncBatcher<TValue>) => void\n  /**\n   * Whether the batcher should start processing immediately\n   * @default true\n   */\n  started?: boolean\n  /**\n   * Whether to throw errors when they occur.\n   * Defaults to true if no onError handler is provided, false if an onError handler is provided.\n   * Can be explicitly set to override these defaults.\n   */\n  throwOnError?: boolean\n  /**\n   * Maximum time in milliseconds to wait before processing a batch.\n   * If the wait duration has elapsed, the batch will be processed.\n   * If not provided, the batch will not be triggered by a timeout.\n   * @default Infinity\n   */\n  wait?: number | ((asyncBatcher: AsyncBatcher<TValue>) => number)\n}\n\ntype AsyncBatcherOptionsWithOptionalCallbacks<TValue> = OptionalKeys<\n  Required<AsyncBatcherOptions<TValue>>,\n  | 'initialState'\n  | 'onError'\n  | 'onExecute'\n  | 'onItemsChange'\n  | 'onSettled'\n  | 'onSuccess'\n>\n\nconst defaultOptions: AsyncBatcherOptionsWithOptionalCallbacks<any> = {\n  getShouldExecute: () => false,\n  maxSize: Infinity,\n  started: true,\n  throwOnError: true,\n  wait: Infinity,\n}\n\n/**\n * A class that collects items and processes them in batches asynchronously.\n *\n * This is the async version of the Batcher class. Unlike the sync version, this async batcher:\n * - Handles promises and returns results from batch executions\n * - Provides error handling with configurable error behavior\n * - Tracks success, error, and settle counts separately\n * - Has state tracking for when batches are executing\n * - Returns the result of the batch function execution\n *\n * Batching is a technique for grouping multiple operations together to be processed as a single unit.\n *\n * The AsyncBatcher provides a flexible way to implement async batching with configurable:\n * - Maximum batch size (number of items per batch)\n * - Time-based batching (process after X milliseconds)\n * - Custom batch processing logic via getShouldExecute\n * - Event callbacks for monitoring batch operations\n * - Error handling for failed batch operations\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and batcher instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the AsyncBatcher instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async batcher\n * - Use `onSuccess` callback to react to successful batch execution and implement custom logic\n * - Use `onError` callback to react to batch execution errors and implement custom error handling\n * - Use `onSettled` callback to react to batch execution completion (success or error) and implement custom logic\n * - Use `onExecute` callback to react to batch execution and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the batcher\n * - The state includes total items processed, success/error counts, and execution status\n * - State can be accessed via `asyncBatcher.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `asyncBatcher.state`\n *\n * @example\n * ```ts\n * const batcher = new AsyncBatcher<number>(\n *   async (items) => {\n *     const result = await processItems(items);\n *     console.log('Processing batch:', items);\n *     return result;\n *   },\n *   {\n *     maxSize: 5,\n *     wait: 2000,\n *     onSuccess: (result) => console.log('Batch succeeded:', result),\n *     onError: (error) => console.error('Batch failed:', error)\n *   }\n * );\n *\n * batcher.addItem(1);\n * batcher.addItem(2);\n * // After 2 seconds or when 5 items are added, whichever comes first,\n * // the batch will be processed and the result will be available\n * // batcher.execute() // manually trigger a batch\n * ```\n */\nexport class AsyncBatcher<TValue> {\n  readonly store: Store<Readonly<AsyncBatcherState<TValue>>> = new Store(\n    getDefaultAsyncBatcherState<TValue>(),\n  )\n  options: AsyncBatcherOptionsWithOptionalCallbacks<TValue>\n  #timeoutId: NodeJS.Timeout | null = null\n\n  constructor(\n    private fn: (items: Array<TValue>) => Promise<any>,\n    initialOptions: AsyncBatcherOptions<TValue>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n      throwOnError: initialOptions.throwOnError ?? !initialOptions.onError,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the async batcher options\n   */\n  setOptions = (newOptions: Partial<AsyncBatcherOptions<TValue>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<AsyncBatcherState<TValue>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const { isExecuting, isPending, items } = combinedState\n      const size = items.length\n      const isEmpty = size === 0\n      return {\n        ...combinedState,\n        isEmpty,\n        size,\n        status: isExecuting\n          ? 'executing'\n          : isPending\n            ? 'pending'\n            : isEmpty\n              ? 'idle'\n              : 'populated',\n      }\n    })\n  }\n\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait, this)\n  }\n\n  /**\n   * Adds an item to the async batcher\n   * If the batch size is reached, timeout occurs, or shouldProcess returns true, the batch will be processed\n   */\n  addItem = (item: TValue): void => {\n    this.#setState({\n      items: [...this.store.state.items, item],\n      isPending: this.options.wait !== Infinity,\n    })\n    this.options.onItemsChange?.(this)\n\n    const shouldProcess =\n      this.store.state.items.length >= this.options.maxSize ||\n      this.options.getShouldExecute(this.store.state.items, this)\n\n    if (shouldProcess) {\n      this.#execute()\n    } else if (this.store.state.isRunning && this.options.wait !== Infinity) {\n      this.#clearTimeout() // clear any pending timeout to replace it with a new one\n      this.#timeoutId = setTimeout(() => this.#execute(), this.#getWait())\n    }\n  }\n\n  /**\n   * Processes the current batch of items asynchronously.\n   * This method will automatically be triggered if the batcher is running and any of these conditions are met:\n   * - The number of items reaches maxSize\n   * - The wait duration has elapsed\n   * - The getShouldExecute function returns true upon adding an item\n   *\n   * You can also call this method manually to process the current batch at any time.\n   *\n   * @returns A promise that resolves with the result of the batch function, or undefined if an error occurred and was handled by onError\n   * @throws The error from the batch function if no onError handler is configured\n   */\n  #execute = async (): Promise<any> => {\n    if (this.store.state.items.length === 0) {\n      return undefined\n    }\n\n    const batch = this.peekAllItems() // copy of the items to be processed (to prevent race conditions)\n    this.clear() // Clear items before processing to prevent race conditions\n    this.options.onItemsChange?.(this) // Call onItemsChange to notify listeners that the items have changed\n\n    this.#setState({ isExecuting: true })\n\n    try {\n      const result = await this.fn(batch) // EXECUTE\n      this.#setState({\n        totalItemsProcessed:\n          this.store.state.totalItemsProcessed + batch.length,\n        lastResult: result,\n        successCount: this.store.state.successCount + 1,\n      })\n      this.options.onSuccess?.(result, this)\n      return result\n    } catch (error) {\n      this.#setState({\n        errorCount: this.store.state.errorCount + 1,\n        failedItems: [...this.store.state.failedItems, ...batch],\n        totalItemsFailed: this.store.state.totalItemsFailed + batch.length,\n      })\n      this.options.onError?.(error, batch, this)\n      if (this.options.throwOnError) {\n        throw error\n      }\n      return undefined\n    } finally {\n      this.#setState({\n        isExecuting: false,\n        settleCount: this.store.state.settleCount + 1,\n      })\n      this.options.onSettled?.(this)\n      this.options.onExecute?.(this)\n    }\n  }\n\n  /**\n   * Processes the current batch of items immediately\n   */\n  flush = async (): Promise<any> => {\n    this.#clearTimeout() // clear any pending timeout\n    return await this.#execute()\n  }\n\n  /**\n   * Stops the async batcher from processing batches\n   */\n  stop = (): void => {\n    this.#setState({ isRunning: false })\n    this.#clearTimeout()\n  }\n\n  /**\n   * Starts the async batcher and processes any pending items\n   */\n  start = (): void => {\n    this.#setState({ isRunning: true })\n    if (this.store.state.items.length > 0 && !this.#timeoutId) {\n      this.#timeoutId = setTimeout(() => this.#execute(), this.#getWait())\n    }\n  }\n\n  /**\n   * Returns a copy of all items in the async batcher\n   */\n  peekAllItems = (): Array<TValue> => {\n    return [...this.store.state.items]\n  }\n\n  peekFailedItems = (): Array<TValue> => {\n    return [...this.store.state.failedItems]\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = null\n    }\n  }\n\n  /**\n   * Removes all items from the async batcher\n   */\n  clear = (): void => {\n    this.#setState({ items: [], failedItems: [], isPending: false })\n  }\n\n  /**\n   * Resets the async batcher state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultAsyncBatcherState<TValue>())\n    this.options.onItemsChange?.(this)\n  }\n}\n\n/**\n * Creates an async batcher that processes items in batches\n *\n * Unlike the sync batcher, this async version:\n * - Handles promises and returns results from batch executions\n * - Provides error handling with configurable error behavior\n * - Tracks success, error, and settle counts separately\n * - Has state tracking for when batches are executing\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and batcher instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncBatcher instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async batcher\n * - Use `onSuccess` callback to react to successful batch execution and implement custom logic\n * - Use `onError` callback to react to batch execution errors and implement custom error handling\n * - Use `onSettled` callback to react to batch execution completion (success or error) and implement custom logic\n * - Use `onExecute` callback to react to batch execution and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the batcher\n * - The state includes total items processed, success/error counts, and execution status\n * - State can be accessed via the underlying AsyncBatcher instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * @example\n * ```ts\n * const batchItems = asyncBatch<number>(\n *   async (items) => {\n *     const result = await processApiCall(items);\n *     console.log('Processing:', items);\n *     return result;\n *   },\n *   {\n *     maxSize: 3,\n *     wait: 1000,\n *     onSuccess: (result) => console.log('Batch succeeded:', result),\n *     onError: (error) => console.error('Batch failed:', error)\n *   }\n * );\n *\n * batchItems(1);\n * batchItems(2);\n * batchItems(3); // Triggers batch processing\n * ```\n */\nexport function asyncBatch<TValue>(\n  fn: (items: Array<TValue>) => Promise<any>,\n  options: AsyncBatcherOptions<TValue>,\n) {\n  const batcher = new AsyncBatcher<TValue>(fn, options)\n  return batcher.addItem\n}\n"],"names":[],"mappings":";;AA+DA,SAAS,8BAAiE;AACxE,SAAO;AAAA,IACL,YAAY;AAAA,IACZ,aAAa,CAAA;AAAA,IACb,SAAS;AAAA,IACT,aAAa;AAAA,IACb,WAAW;AAAA,IACX,WAAW;AAAA,IACX,OAAO,CAAA;AAAA,IACP,YAAY;AAAA,IACZ,aAAa;AAAA,IACb,MAAM;AAAA,IACN,QAAQ;AAAA,IACR,cAAc;AAAA,IACd,qBAAqB;AAAA,IACrB,kBAAkB;AAAA,EAAA;AAEtB;AA+EA,MAAM,iBAAgE;AAAA,EACpE,kBAAkB,MAAM;AAAA,EACxB,SAAS;AAAA,EACT,SAAS;AAAA,EACT,cAAc;AAAA,EACd,MAAM;AACR;AA+DO,MAAM,aAAqB;AAAA,EAOhC,YACU,IACR,gBACA;AAFQ,SAAA,KAAA;AAPV,SAAS,QAAoD,IAAI;AAAA,MAC/D,4BAAA;AAAA,IAAoC;AAGtC,SAAA,aAAoC;AAiBpC,SAAA,aAAa,CAAC,eAA2D;AACvE,WAAK,UAAU,EAAE,GAAG,KAAK,SAAS,GAAG,WAAA;AAAA,IAAW;AAGlD,SAAA,YAAY,CAAC,aAAuD;AAClE,WAAK,MAAM,SAAS,CAAC,UAAU;AAC7B,cAAM,gBAAgB;AAAA,UACpB,GAAG;AAAA,UACH,GAAG;AAAA,QAAA;AAEL,cAAM,EAAE,aAAa,WAAW,MAAA,IAAU;AAC1C,cAAM,OAAO,MAAM;AACnB,cAAM,UAAU,SAAS;AACzB,eAAO;AAAA,UACL,GAAG;AAAA,UACH;AAAA,UACA;AAAA,UACA,QAAQ,cACJ,cACA,YACE,YACA,UACE,SACA;AAAA,QAAA;AAAA,MACV,CACD;AAAA,IAAA;AAGH,SAAA,WAAW,MAAc;AACvB,aAAO,qBAAqB,KAAK,QAAQ,MAAM,IAAI;AAAA,IAAA;AAOrD,SAAA,UAAU,CAAC,SAAuB;AAChC,WAAK,UAAU;AAAA,QACb,OAAO,CAAC,GAAG,KAAK,MAAM,MAAM,OAAO,IAAI;AAAA,QACvC,WAAW,KAAK,QAAQ,SAAS;AAAA,MAAA,CAClC;AACD,WAAK,QAAQ,gBAAgB,IAAI;AAEjC,YAAM,gBACJ,KAAK,MAAM,MAAM,MAAM,UAAU,KAAK,QAAQ,WAC9C,KAAK,QAAQ,iBAAiB,KAAK,MAAM,MAAM,OAAO,IAAI;AAE5D,UAAI,eAAe;AACjB,aAAK,SAAA;AAAA,MAAS,WACL,KAAK,MAAM,MAAM,aAAa,KAAK,QAAQ,SAAS,UAAU;AACvE,aAAK,cAAA;AACL,aAAK,aAAa,WAAW,MAAM,KAAK,YAAY,KAAK,UAAU;AAAA,MAAA;AAAA,IACrE;AAeF,SAAA,WAAW,YAA0B;AACnC,UAAI,KAAK,MAAM,MAAM,MAAM,WAAW,GAAG;AACvC,eAAO;AAAA,MAAA;AAGT,YAAM,QAAQ,KAAK,aAAA;AACnB,WAAK,MAAA;AACL,WAAK,QAAQ,gBAAgB,IAAI;AAEjC,WAAK,UAAU,EAAE,aAAa,KAAA,CAAM;AAEpC,UAAI;AACF,cAAM,SAAS,MAAM,KAAK,GAAG,KAAK;AAClC,aAAK,UAAU;AAAA,UACb,qBACE,KAAK,MAAM,MAAM,sBAAsB,MAAM;AAAA,UAC/C,YAAY;AAAA,UACZ,cAAc,KAAK,MAAM,MAAM,eAAe;AAAA,QAAA,CAC/C;AACD,aAAK,QAAQ,YAAY,QAAQ,IAAI;AACrC,eAAO;AAAA,MAAA,SACA,OAAO;AACd,aAAK,UAAU;AAAA,UACb,YAAY,KAAK,MAAM,MAAM,aAAa;AAAA,UAC1C,aAAa,CAAC,GAAG,KAAK,MAAM,MAAM,aAAa,GAAG,KAAK;AAAA,UACvD,kBAAkB,KAAK,MAAM,MAAM,mBAAmB,MAAM;AAAA,QAAA,CAC7D;AACD,aAAK,QAAQ,UAAU,OAAO,OAAO,IAAI;AACzC,YAAI,KAAK,QAAQ,cAAc;AAC7B,gBAAM;AAAA,QAAA;AAER,eAAO;AAAA,MAAA,UACT;AACE,aAAK,UAAU;AAAA,UACb,aAAa;AAAA,UACb,aAAa,KAAK,MAAM,MAAM,cAAc;AAAA,QAAA,CAC7C;AACD,aAAK,QAAQ,YAAY,IAAI;AAC7B,aAAK,QAAQ,YAAY,IAAI;AAAA,MAAA;AAAA,IAC/B;AAMF,SAAA,QAAQ,YAA0B;AAChC,WAAK,cAAA;AACL,aAAO,MAAM,KAAK,SAAA;AAAA,IAAS;AAM7B,SAAA,OAAO,MAAY;AACjB,WAAK,UAAU,EAAE,WAAW,MAAA,CAAO;AACnC,WAAK,cAAA;AAAA,IAAc;AAMrB,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,EAAE,WAAW,KAAA,CAAM;AAClC,UAAI,KAAK,MAAM,MAAM,MAAM,SAAS,KAAK,CAAC,KAAK,YAAY;AACzD,aAAK,aAAa,WAAW,MAAM,KAAK,YAAY,KAAK,UAAU;AAAA,MAAA;AAAA,IACrE;AAMF,SAAA,eAAe,MAAqB;AAClC,aAAO,CAAC,GAAG,KAAK,MAAM,MAAM,KAAK;AAAA,IAAA;AAGnC,SAAA,kBAAkB,MAAqB;AACrC,aAAO,CAAC,GAAG,KAAK,MAAM,MAAM,WAAW;AAAA,IAAA;AAGzC,SAAA,gBAAgB,MAAY;AAC1B,UAAI,KAAK,YAAY;AACnB,qBAAa,KAAK,UAAU;AAC5B,aAAK,aAAa;AAAA,MAAA;AAAA,IACpB;AAMF,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,EAAE,OAAO,CAAA,GAAI,aAAa,CAAA,GAAI,WAAW,OAAO;AAAA,IAAA;AAMjE,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,6BAAqC;AACpD,WAAK,QAAQ,gBAAgB,IAAI;AAAA,IAAA;AAhLjC,SAAK,UAAU;AAAA,MACb,GAAG;AAAA,MACH,GAAG;AAAA,MACH,cAAc,eAAe,gBAAgB,CAAC,eAAe;AAAA,IAAA;AAE/D,SAAK,UAAU,KAAK,QAAQ,gBAAgB,CAAA,CAAE;AAAA,EAAA;AAAA,EAXhD;AAAA,EAqBA;AAAA,EAwBA;AAAA,EAuCA;AAAA,EA+EA;AAqBF;AAmDO,SAAS,WACd,IACA,SACA;AACA,QAAM,UAAU,IAAI,aAAqB,IAAI,OAAO;AACpD,SAAO,QAAQ;AACjB;"}
+{"version":3,"file":"async-batcher.js","sources":["../../src/async-batcher.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { OptionalKeys } from './types'\n\nexport interface AsyncBatcherState<TValue> {\n  /**\n   * Number of batch executions that have resulted in errors\n   */\n  errorCount: number\n  /**\n   * Array of items that failed during batch processing\n   */\n  failedItems: Array<TValue>\n  /**\n   * Whether the batcher has no items to process (items array is empty)\n   */\n  isEmpty: boolean\n  /**\n   * Whether a batch is currently being processed asynchronously\n   */\n  isExecuting: boolean\n  /**\n   * Whether the batcher is waiting for the timeout to trigger batch processing\n   */\n  isPending: boolean\n  /**\n   * Array of items currently queued for batch processing\n   */\n  items: Array<TValue>\n  /**\n   * The result from the most recent batch execution\n   */\n  lastResult: any\n  /**\n   * Number of batch executions that have completed (either successfully or with errors)\n   */\n  settleCount: number\n  /**\n   * Number of items currently in the batch queue\n   */\n  size: number\n  /**\n   * Current processing status - 'idle' when not processing, 'pending' when waiting for timeout, 'executing' when processing, 'populated' when items are present, but no wait is configured\n   */\n  status: 'idle' | 'pending' | 'executing' | 'populated'\n  /**\n   * Number of batch executions that have completed successfully\n   */\n  successCount: number\n  /**\n   * Total number of items that have failed processing across all batches\n   */\n  totalItemsFailed: number\n  /**\n   * Total number of items that have been processed across all batches\n   */\n  totalItemsProcessed: number\n}\n\nfunction getDefaultAsyncBatcherState<TValue>(): AsyncBatcherState<TValue> {\n  return {\n    errorCount: 0,\n    failedItems: [],\n    isEmpty: true,\n    isExecuting: false,\n    isPending: false,\n    items: [],\n    lastResult: undefined,\n    settleCount: 0,\n    size: 0,\n    status: 'idle',\n    successCount: 0,\n    totalItemsProcessed: 0,\n    totalItemsFailed: 0,\n  }\n}\n\n/**\n * Options for configuring an AsyncBatcher instance\n */\nexport interface AsyncBatcherOptions<TValue> {\n  /**\n   * Custom function to determine if a batch should be processed\n   * Return true to process the batch immediately\n   */\n  getShouldExecute?: (\n    items: Array<TValue>,\n    batcher: AsyncBatcher<TValue>,\n  ) => boolean\n  /**\n   * Initial state for the async batcher\n   */\n  initialState?: Partial<AsyncBatcherState<TValue>>\n  /**\n   * Maximum number of items in a batch\n   * @default Infinity\n   */\n  maxSize?: number\n  /**\n   * Optional error handler for when the batch function throws.\n   * If provided, the handler will be called with the error and batcher instance.\n   * This can be used alongside throwOnError - the handler will be called before any error is thrown.\n   */\n  onError?: (\n    error: unknown,\n    failedItems: Array<TValue>,\n    batcher: AsyncBatcher<TValue>,\n  ) => void\n  /**\n   * Callback fired after a batch is processed\n   */\n  onExecute?: (batcher: AsyncBatcher<TValue>) => void\n  /**\n   * Callback fired after items are added to the batcher\n   */\n  onItemsChange?: (batcher: AsyncBatcher<TValue>) => void\n  /**\n   * Optional callback to call when a batch is settled (completed or failed)\n   */\n  onSettled?: (batcher: AsyncBatcher<TValue>) => void\n  /**\n   * Optional callback to call when a batch succeeds\n   */\n  onSuccess?: (result: any, batcher: AsyncBatcher<TValue>) => void\n  /**\n   * Whether the batcher should start processing immediately\n   * @default true\n   */\n  started?: boolean\n  /**\n   * Whether to throw errors when they occur.\n   * Defaults to true if no onError handler is provided, false if an onError handler is provided.\n   * Can be explicitly set to override these defaults.\n   */\n  throwOnError?: boolean\n  /**\n   * Maximum time in milliseconds to wait before processing a batch.\n   * If the wait duration has elapsed, the batch will be processed.\n   * If not provided, the batch will not be triggered by a timeout.\n   * @default Infinity\n   */\n  wait?: number | ((asyncBatcher: AsyncBatcher<TValue>) => number)\n}\n\ntype AsyncBatcherOptionsWithOptionalCallbacks<TValue> = OptionalKeys<\n  Required<AsyncBatcherOptions<TValue>>,\n  | 'initialState'\n  | 'onError'\n  | 'onExecute'\n  | 'onItemsChange'\n  | 'onSettled'\n  | 'onSuccess'\n>\n\nconst defaultOptions: AsyncBatcherOptionsWithOptionalCallbacks<any> = {\n  getShouldExecute: () => false,\n  maxSize: Infinity,\n  started: true,\n  throwOnError: true,\n  wait: Infinity,\n}\n\n/**\n * A class that collects items and processes them in batches asynchronously.\n *\n * This is the async version of the Batcher class. Unlike the sync version, this async batcher:\n * - Handles promises and returns results from batch executions\n * - Provides error handling with configurable error behavior\n * - Tracks success, error, and settle counts separately\n * - Has state tracking for when batches are executing\n * - Returns the result of the batch function execution\n *\n * Batching is a technique for grouping multiple operations together to be processed as a single unit.\n *\n * The AsyncBatcher provides a flexible way to implement async batching with configurable:\n * - Maximum batch size (number of items per batch)\n * - Time-based batching (process after X milliseconds)\n * - Custom batch processing logic via getShouldExecute\n * - Event callbacks for monitoring batch operations\n * - Error handling for failed batch operations\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and batcher instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the AsyncBatcher instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async batcher\n * - Use `onSuccess` callback to react to successful batch execution and implement custom logic\n * - Use `onError` callback to react to batch execution errors and implement custom error handling\n * - Use `onSettled` callback to react to batch execution completion (success or error) and implement custom logic\n * - Use `onExecute` callback to react to batch execution and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the batcher\n * - The state includes total items processed, success/error counts, and execution status\n * - State can be accessed via `asyncBatcher.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `asyncBatcher.state`\n *\n * @example\n * ```ts\n * const batcher = new AsyncBatcher<number>(\n *   async (items) => {\n *     const result = await processItems(items);\n *     console.log('Processing batch:', items);\n *     return result;\n *   },\n *   {\n *     maxSize: 5,\n *     wait: 2000,\n *     onSuccess: (result) => console.log('Batch succeeded:', result),\n *     onError: (error) => console.error('Batch failed:', error)\n *   }\n * );\n *\n * batcher.addItem(1);\n * batcher.addItem(2);\n * // After 2 seconds or when 5 items are added, whichever comes first,\n * // the batch will be processed and the result will be available\n * // batcher.execute() // manually trigger a batch\n * ```\n */\nexport class AsyncBatcher<TValue> {\n  readonly store: Store<Readonly<AsyncBatcherState<TValue>>> = new Store(\n    getDefaultAsyncBatcherState<TValue>(),\n  )\n  options: AsyncBatcherOptionsWithOptionalCallbacks<TValue>\n  #timeoutId: NodeJS.Timeout | null = null\n\n  constructor(\n    private fn: (items: Array<TValue>) => Promise<any>,\n    initialOptions: AsyncBatcherOptions<TValue>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n      throwOnError: initialOptions.throwOnError ?? !initialOptions.onError,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the async batcher options\n   */\n  setOptions = (newOptions: Partial<AsyncBatcherOptions<TValue>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<AsyncBatcherState<TValue>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const { isExecuting, isPending, items } = combinedState\n      const size = items.length\n      const isEmpty = size === 0\n      return {\n        ...combinedState,\n        isEmpty,\n        size,\n        status: isExecuting\n          ? 'executing'\n          : isPending\n            ? 'pending'\n            : isEmpty\n              ? 'idle'\n              : 'populated',\n      }\n    })\n  }\n\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait, this)\n  }\n\n  /**\n   * Adds an item to the async batcher\n   * If the batch size is reached, timeout occurs, or shouldProcess returns true, the batch will be processed\n   */\n  addItem = (item: TValue): void => {\n    this.#setState({\n      items: [...this.store.state.items, item],\n      isPending: this.options.wait !== Infinity,\n    })\n    this.options.onItemsChange?.(this)\n\n    const shouldProcess =\n      this.store.state.items.length >= this.options.maxSize ||\n      this.options.getShouldExecute(this.store.state.items, this)\n\n    if (shouldProcess) {\n      this.#execute()\n    } else if (this.options.wait !== Infinity) {\n      this.#clearTimeout() // clear any pending timeout to replace it with a new one\n      this.#timeoutId = setTimeout(() => this.#execute(), this.#getWait())\n    }\n  }\n\n  /**\n   * Processes the current batch of items asynchronously.\n   * This method will automatically be triggered if the batcher is running and any of these conditions are met:\n   * - The number of items reaches maxSize\n   * - The wait duration has elapsed\n   * - The getShouldExecute function returns true upon adding an item\n   *\n   * You can also call this method manually to process the current batch at any time.\n   *\n   * @returns A promise that resolves with the result of the batch function, or undefined if an error occurred and was handled by onError\n   * @throws The error from the batch function if no onError handler is configured\n   */\n  #execute = async (): Promise<any> => {\n    if (this.store.state.items.length === 0) {\n      return undefined\n    }\n\n    const batch = this.peekAllItems() // copy of the items to be processed (to prevent race conditions)\n    this.clear() // Clear items before processing to prevent race conditions\n    this.options.onItemsChange?.(this) // Call onItemsChange to notify listeners that the items have changed\n\n    this.#setState({ isExecuting: true })\n\n    try {\n      const result = await this.fn(batch) // EXECUTE\n      this.#setState({\n        totalItemsProcessed:\n          this.store.state.totalItemsProcessed + batch.length,\n        lastResult: result,\n        successCount: this.store.state.successCount + 1,\n      })\n      this.options.onSuccess?.(result, this)\n      return result\n    } catch (error) {\n      this.#setState({\n        errorCount: this.store.state.errorCount + 1,\n        failedItems: [...this.store.state.failedItems, ...batch],\n        totalItemsFailed: this.store.state.totalItemsFailed + batch.length,\n      })\n      this.options.onError?.(error, batch, this)\n      if (this.options.throwOnError) {\n        throw error\n      }\n      return undefined\n    } finally {\n      this.#setState({\n        isExecuting: false,\n        settleCount: this.store.state.settleCount + 1,\n      })\n      this.options.onSettled?.(this)\n      this.options.onExecute?.(this)\n    }\n  }\n\n  /**\n   * Processes the current batch of items immediately\n   */\n  flush = async (): Promise<any> => {\n    this.#clearTimeout() // clear any pending timeout\n    return await this.#execute()\n  }\n\n  /**\n   * Returns a copy of all items in the async batcher\n   */\n  peekAllItems = (): Array<TValue> => {\n    return [...this.store.state.items]\n  }\n\n  peekFailedItems = (): Array<TValue> => {\n    return [...this.store.state.failedItems]\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = null\n    }\n  }\n\n  /**\n   * Removes all items from the async batcher\n   */\n  clear = (): void => {\n    this.#setState({ items: [], failedItems: [], isPending: false })\n  }\n\n  /**\n   * Resets the async batcher state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultAsyncBatcherState<TValue>())\n    this.options.onItemsChange?.(this)\n  }\n}\n\n/**\n * Creates an async batcher that processes items in batches\n *\n * Unlike the sync batcher, this async version:\n * - Handles promises and returns results from batch executions\n * - Provides error handling with configurable error behavior\n * - Tracks success, error, and settle counts separately\n * - Has state tracking for when batches are executing\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and batcher instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncBatcher instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async batcher\n * - Use `onSuccess` callback to react to successful batch execution and implement custom logic\n * - Use `onError` callback to react to batch execution errors and implement custom error handling\n * - Use `onSettled` callback to react to batch execution completion (success or error) and implement custom logic\n * - Use `onExecute` callback to react to batch execution and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the batcher\n * - The state includes total items processed, success/error counts, and execution status\n * - State can be accessed via the underlying AsyncBatcher instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * @example\n * ```ts\n * const batchItems = asyncBatch<number>(\n *   async (items) => {\n *     const result = await processApiCall(items);\n *     console.log('Processing:', items);\n *     return result;\n *   },\n *   {\n *     maxSize: 3,\n *     wait: 1000,\n *     onSuccess: (result) => console.log('Batch succeeded:', result),\n *     onError: (error) => console.error('Batch failed:', error)\n *   }\n * );\n *\n * batchItems(1);\n * batchItems(2);\n * batchItems(3); // Triggers batch processing\n * ```\n */\nexport function asyncBatch<TValue>(\n  fn: (items: Array<TValue>) => Promise<any>,\n  options: AsyncBatcherOptions<TValue>,\n) {\n  const batcher = new AsyncBatcher<TValue>(fn, options)\n  return batcher.addItem\n}\n"],"names":[],"mappings":";;AA2DA,SAAS,8BAAiE;AACxE,SAAO;AAAA,IACL,YAAY;AAAA,IACZ,aAAa,CAAA;AAAA,IACb,SAAS;AAAA,IACT,aAAa;AAAA,IACb,WAAW;AAAA,IACX,OAAO,CAAA;AAAA,IACP,YAAY;AAAA,IACZ,aAAa;AAAA,IACb,MAAM;AAAA,IACN,QAAQ;AAAA,IACR,cAAc;AAAA,IACd,qBAAqB;AAAA,IACrB,kBAAkB;AAAA,EAAA;AAEtB;AA+EA,MAAM,iBAAgE;AAAA,EACpE,kBAAkB,MAAM;AAAA,EACxB,SAAS;AAAA,EACT,SAAS;AAAA,EACT,cAAc;AAAA,EACd,MAAM;AACR;AA+DO,MAAM,aAAqB;AAAA,EAOhC,YACU,IACR,gBACA;AAFQ,SAAA,KAAA;AAPV,SAAS,QAAoD,IAAI;AAAA,MAC/D,4BAAA;AAAA,IAAoC;AAGtC,SAAA,aAAoC;AAiBpC,SAAA,aAAa,CAAC,eAA2D;AACvE,WAAK,UAAU,EAAE,GAAG,KAAK,SAAS,GAAG,WAAA;AAAA,IAAW;AAGlD,SAAA,YAAY,CAAC,aAAuD;AAClE,WAAK,MAAM,SAAS,CAAC,UAAU;AAC7B,cAAM,gBAAgB;AAAA,UACpB,GAAG;AAAA,UACH,GAAG;AAAA,QAAA;AAEL,cAAM,EAAE,aAAa,WAAW,MAAA,IAAU;AAC1C,cAAM,OAAO,MAAM;AACnB,cAAM,UAAU,SAAS;AACzB,eAAO;AAAA,UACL,GAAG;AAAA,UACH;AAAA,UACA;AAAA,UACA,QAAQ,cACJ,cACA,YACE,YACA,UACE,SACA;AAAA,QAAA;AAAA,MACV,CACD;AAAA,IAAA;AAGH,SAAA,WAAW,MAAc;AACvB,aAAO,qBAAqB,KAAK,QAAQ,MAAM,IAAI;AAAA,IAAA;AAOrD,SAAA,UAAU,CAAC,SAAuB;AAChC,WAAK,UAAU;AAAA,QACb,OAAO,CAAC,GAAG,KAAK,MAAM,MAAM,OAAO,IAAI;AAAA,QACvC,WAAW,KAAK,QAAQ,SAAS;AAAA,MAAA,CAClC;AACD,WAAK,QAAQ,gBAAgB,IAAI;AAEjC,YAAM,gBACJ,KAAK,MAAM,MAAM,MAAM,UAAU,KAAK,QAAQ,WAC9C,KAAK,QAAQ,iBAAiB,KAAK,MAAM,MAAM,OAAO,IAAI;AAE5D,UAAI,eAAe;AACjB,aAAK,SAAA;AAAA,MAAS,WACL,KAAK,QAAQ,SAAS,UAAU;AACzC,aAAK,cAAA;AACL,aAAK,aAAa,WAAW,MAAM,KAAK,YAAY,KAAK,UAAU;AAAA,MAAA;AAAA,IACrE;AAeF,SAAA,WAAW,YAA0B;AACnC,UAAI,KAAK,MAAM,MAAM,MAAM,WAAW,GAAG;AACvC,eAAO;AAAA,MAAA;AAGT,YAAM,QAAQ,KAAK,aAAA;AACnB,WAAK,MAAA;AACL,WAAK,QAAQ,gBAAgB,IAAI;AAEjC,WAAK,UAAU,EAAE,aAAa,KAAA,CAAM;AAEpC,UAAI;AACF,cAAM,SAAS,MAAM,KAAK,GAAG,KAAK;AAClC,aAAK,UAAU;AAAA,UACb,qBACE,KAAK,MAAM,MAAM,sBAAsB,MAAM;AAAA,UAC/C,YAAY;AAAA,UACZ,cAAc,KAAK,MAAM,MAAM,eAAe;AAAA,QAAA,CAC/C;AACD,aAAK,QAAQ,YAAY,QAAQ,IAAI;AACrC,eAAO;AAAA,MAAA,SACA,OAAO;AACd,aAAK,UAAU;AAAA,UACb,YAAY,KAAK,MAAM,MAAM,aAAa;AAAA,UAC1C,aAAa,CAAC,GAAG,KAAK,MAAM,MAAM,aAAa,GAAG,KAAK;AAAA,UACvD,kBAAkB,KAAK,MAAM,MAAM,mBAAmB,MAAM;AAAA,QAAA,CAC7D;AACD,aAAK,QAAQ,UAAU,OAAO,OAAO,IAAI;AACzC,YAAI,KAAK,QAAQ,cAAc;AAC7B,gBAAM;AAAA,QAAA;AAER,eAAO;AAAA,MAAA,UACT;AACE,aAAK,UAAU;AAAA,UACb,aAAa;AAAA,UACb,aAAa,KAAK,MAAM,MAAM,cAAc;AAAA,QAAA,CAC7C;AACD,aAAK,QAAQ,YAAY,IAAI;AAC7B,aAAK,QAAQ,YAAY,IAAI;AAAA,MAAA;AAAA,IAC/B;AAMF,SAAA,QAAQ,YAA0B;AAChC,WAAK,cAAA;AACL,aAAO,MAAM,KAAK,SAAA;AAAA,IAAS;AAM7B,SAAA,eAAe,MAAqB;AAClC,aAAO,CAAC,GAAG,KAAK,MAAM,MAAM,KAAK;AAAA,IAAA;AAGnC,SAAA,kBAAkB,MAAqB;AACrC,aAAO,CAAC,GAAG,KAAK,MAAM,MAAM,WAAW;AAAA,IAAA;AAGzC,SAAA,gBAAgB,MAAY;AAC1B,UAAI,KAAK,YAAY;AACnB,qBAAa,KAAK,UAAU;AAC5B,aAAK,aAAa;AAAA,MAAA;AAAA,IACpB;AAMF,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,EAAE,OAAO,CAAA,GAAI,aAAa,CAAA,GAAI,WAAW,OAAO;AAAA,IAAA;AAMjE,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,6BAAqC;AACpD,WAAK,QAAQ,gBAAgB,IAAI;AAAA,IAAA;AA9JjC,SAAK,UAAU;AAAA,MACb,GAAG;AAAA,MACH,GAAG;AAAA,MACH,cAAc,eAAe,gBAAgB,CAAC,eAAe;AAAA,IAAA;AAE/D,SAAK,UAAU,KAAK,QAAQ,gBAAgB,CAAA,CAAE;AAAA,EAAA;AAAA,EAXhD;AAAA,EAqBA;AAAA,EAwBA;AAAA,EAuCA;AAAA,EA6DA;AAqBF;AAmDO,SAAS,WACd,IACA,SACA;AACA,QAAM,UAAU,IAAI,aAAqB,IAAI,OAAO;AACpD,SAAO,QAAQ;AACjB;"}

dist/esm/async-debouncer.d.ts

@@ -165,3 +165,3 @@ import { Store } from '@tanstack/store';
      */
-    flush: () => void;
+    flush: () => Promise<ReturnType<TFn> | undefined>;
     /**
@@ -168,0 +168,0 @@ * Cancels any pending execution or aborts any execution in progress

dist/esm/async-debouncer.js

@@ -29,2 +29,3 @@ import { Store } from "@tanstack/store";
     this.#resolvePreviousPromise = null;
+    this.#rejectPreviousPromise = null;
     this.setOptions = (newOptions) => {
@@ -67,4 +68,5 @@ this.options = { ...this.options, ...newOptions };
       }
-      return new Promise((resolve) => {
+      return new Promise((resolve, reject) => {
         this.#resolvePreviousPromise = resolve;
+        this.#rejectPreviousPromise = reject;
         this.#timeoutId = setTimeout(async () => {
@@ -97,3 +99,3 @@ if (this.options.trailing && this.store.state.lastArgs) {
         if (this.options.throwOnError) {
-          throw error;
+          this.#rejectPreviousPromiseInternal(error);
         }
@@ -111,9 +113,24 @@ } finally {
     };
-    this.flush = () => {
+    this.flush = async () => {
       if (this.store.state.isPending && this.store.state.lastArgs) {
         this.#abortExecution();
         this.#clearTimeout();
-        this.#execute(...this.store.state.lastArgs);
+        const result = await this.#execute(...this.store.state.lastArgs);
+        this.#resolvePreviousPromiseInternal();
+        return result;
       }
+      return void 0;
     };
+    this.#resolvePreviousPromiseInternal = () => {
+      if (this.#resolvePreviousPromise) {
+        this.#resolvePreviousPromise(this.store.state.lastResult);
+        this.#resolvePreviousPromise = null;
+      }
+    };
+    this.#rejectPreviousPromiseInternal = (error) => {
+      if (this.#rejectPreviousPromise) {
+        this.#rejectPreviousPromise(error);
+        this.#rejectPreviousPromise = null;
+      }
+    };
     this.#clearTimeout = () => {
@@ -127,6 +144,3 @@ if (this.#timeoutId) {
       this.#clearTimeout();
-      if (this.#resolvePreviousPromise) {
-        this.#resolvePreviousPromise(this.store.state.lastResult);
-        this.#resolvePreviousPromise = null;
-      }
+      this.#resolvePreviousPromiseInternal();
       this.#setState({
@@ -162,2 +176,3 @@ isPending: false,
   #resolvePreviousPromise;
+  #rejectPreviousPromise;
   #setState;
@@ -167,2 +182,4 @@ #getEnabled;
   #execute;
+  #resolvePreviousPromiseInternal;
+  #rejectPreviousPromiseInternal;
   #clearTimeout;
@@ -169,0 +186,0 @@ #cancelPendingExecution;

dist/esm/async-debouncer.js.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"async-debouncer.js","sources":["../../src/async-debouncer.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { AnyAsyncFunction, OptionalKeys } from './types'\n\nexport interface AsyncDebouncerState<TFn extends AnyAsyncFunction> {\n  /**\n   * Whether the debouncer can execute on the leading edge of the timeout\n   */\n  canLeadingExecute: boolean\n  /**\n   * Number of function executions that have resulted in errors\n   */\n  errorCount: number\n  /**\n   * Whether the debounced function is currently executing asynchronously\n   */\n  isExecuting: boolean\n  /**\n   * Whether the debouncer is waiting for the timeout to trigger execution\n   */\n  isPending: boolean\n  /**\n   * The arguments from the most recent call to maybeExecute\n   */\n  lastArgs: Parameters<TFn> | undefined\n  /**\n   * The result from the most recent successful function execution\n   */\n  lastResult: ReturnType<TFn> | undefined\n  /**\n   * Number of function executions that have completed (either successfully or with errors)\n   */\n  settleCount: number\n  /**\n   * Current execution status - 'idle' when not active, 'pending' when waiting, 'executing' when running, 'settled' when completed\n   */\n  status: 'disabled' | 'idle' | 'pending' | 'executing' | 'settled'\n  /**\n   * Number of function executions that have completed successfully\n   */\n  successCount: number\n}\n\nfunction getDefaultAsyncDebouncerState<\n  TFn extends AnyAsyncFunction,\n>(): AsyncDebouncerState<TFn> {\n  return structuredClone({\n    canLeadingExecute: true,\n    errorCount: 0,\n    isExecuting: false,\n    isPending: false,\n    lastArgs: undefined,\n    lastResult: undefined,\n    settleCount: 0,\n    successCount: 0,\n    status: 'idle',\n  })\n}\n\n/**\n * Options for configuring an async debounced function\n */\nexport interface AsyncDebouncerOptions<TFn extends AnyAsyncFunction> {\n  /**\n   * Whether the debouncer is enabled. When disabled, maybeExecute will not trigger any executions.\n   * Can be a boolean or a function that returns a boolean.\n   * Defaults to true.\n   */\n  enabled?: boolean | ((debouncer: AsyncDebouncer<TFn>) => boolean)\n  /**\n   * Initial state for the async debouncer\n   */\n  initialState?: Partial<AsyncDebouncerState<TFn>>\n  /**\n   * Whether to execute on the leading edge of the timeout.\n   * Defaults to false.\n   */\n  leading?: boolean\n  /**\n   * Optional error handler for when the debounced function throws.\n   * If provided, the handler will be called with the error and debouncer instance.\n   * This can be used alongside throwOnError - the handler will be called before any error is thrown.\n   */\n  onError?: (error: unknown, debouncer: AsyncDebouncer<TFn>) => void\n  /**\n   * Optional callback to call when the debounced function is executed\n   */\n  onSettled?: (debouncer: AsyncDebouncer<TFn>) => void\n  /**\n   * Optional callback to call when the debounced function is executed\n   */\n  onSuccess?: (result: ReturnType<TFn>, debouncer: AsyncDebouncer<TFn>) => void\n  /**\n   * Whether to throw errors when they occur.\n   * Defaults to true if no onError handler is provided, false if an onError handler is provided.\n   * Can be explicitly set to override these defaults.\n   */\n  throwOnError?: boolean\n  /**\n   * Whether to execute on the trailing edge of the timeout.\n   * Defaults to true.\n   */\n  trailing?: boolean\n  /**\n   * Delay in milliseconds to wait after the last call before executing.\n   * Can be a number or a function that returns a number.\n   * Defaults to 0ms\n   */\n  wait: number | ((debouncer: AsyncDebouncer<TFn>) => number)\n}\n\ntype AsyncDebouncerOptionsWithOptionalCallbacks = OptionalKeys<\n  AsyncDebouncerOptions<any>,\n  'initialState' | 'onError' | 'onSettled' | 'onSuccess'\n>\n\nconst defaultOptions: AsyncDebouncerOptionsWithOptionalCallbacks = {\n  enabled: true,\n  leading: false,\n  trailing: true,\n  wait: 0,\n}\n\n/**\n * A class that creates an async debounced function.\n *\n * Debouncing ensures that a function is only executed after a specified delay has passed since its last invocation.\n * Each new invocation resets the delay timer. This is useful for handling frequent events like window resizing\n * or input changes where you only want to execute the handler after the events have stopped occurring.\n *\n * Unlike throttling which allows execution at regular intervals, debouncing prevents any execution until\n * the function stops being called for the specified delay period.\n *\n * Unlike the non-async Debouncer, this async version supports returning values from the debounced function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the debounced function.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and debouncer instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying store\n *\n * State Management:\n * - The debouncer uses a reactive store for state management\n * - Use `initialState` to provide initial state values when creating the async debouncer\n * - The state includes canLeadingExecute, error count, execution status, and success/settle counts\n * - State can be accessed via the `store` property and its `state` getter\n * - The store is reactive and will notify subscribers of state changes\n *\n * @example\n * ```ts\n * const asyncDebouncer = new AsyncDebouncer(async (value: string) => {\n *   const results = await searchAPI(value);\n *   return results; // Return value is preserved\n * }, {\n *   wait: 500,\n *   onError: (error) => {\n *     console.error('Search failed:', error);\n *   }\n * });\n *\n * // Called on each keystroke but only executes after 500ms of no typing\n * // Returns the API response directly\n * const results = await asyncDebouncer.maybeExecute(inputElement.value);\n * ```\n */\nexport class AsyncDebouncer<TFn extends AnyAsyncFunction> {\n  readonly store: Store<Readonly<AsyncDebouncerState<TFn>>> = new Store<\n    AsyncDebouncerState<TFn>\n  >(getDefaultAsyncDebouncerState<TFn>())\n  options: AsyncDebouncerOptions<TFn>\n  #abortController: AbortController | null = null\n  #timeoutId: NodeJS.Timeout | null = null\n  #resolvePreviousPromise:\n    | ((value?: ReturnType<TFn> | undefined) => void)\n    | null = null\n\n  constructor(\n    private fn: TFn,\n    initialOptions: AsyncDebouncerOptions<TFn>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n      throwOnError: initialOptions.throwOnError ?? !initialOptions.onError,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the async debouncer options\n   */\n  setOptions = (newOptions: Partial<AsyncDebouncerOptions<TFn>>): void => {\n    this.options = { ...this.options, ...newOptions }\n\n    // Cancel pending execution if the debouncer is disabled\n    if (!this.#getEnabled()) {\n      this.cancel()\n    }\n  }\n\n  #setState = (newState: Partial<AsyncDebouncerState<TFn>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const { isPending, isExecuting, settleCount } = combinedState\n      return {\n        ...combinedState,\n        status: !this.#getEnabled()\n          ? 'disabled'\n          : isPending\n            ? 'pending'\n            : isExecuting\n              ? 'executing'\n              : settleCount > 0\n                ? 'settled'\n                : 'idle',\n      }\n    })\n  }\n\n  /**\n   * Returns the current debouncer enabled state\n   */\n  #getEnabled = (): boolean => {\n    return !!parseFunctionOrValue(this.options.enabled, this)\n  }\n\n  /**\n   * Returns the current debouncer wait state\n   */\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait, this)\n  }\n\n  /**\n   * Attempts to execute the debounced function.\n   * If a call is already in progress, it will be queued.\n   *\n   * Error Handling:\n   * - If the debounced function throws and no `onError` handler is configured,\n   *   the error will be thrown from this method.\n   * - If an `onError` handler is configured, errors will be caught and passed to the handler,\n   *   and this method will return undefined.\n   * - The error state can be checked using `getErrorCount()` and `getIsExecuting()`.\n   *\n   * @returns A promise that resolves with the function's return value, or undefined if an error occurred and was handled by onError\n   * @throws The error from the debounced function if no onError handler is configured\n   */\n  maybeExecute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    if (!this.#getEnabled()) return undefined\n    this.#cancelPendingExecution()\n    this.#setState({ lastArgs: args })\n\n    // Handle leading execution\n    if (this.options.leading && this.store.state.canLeadingExecute) {\n      this.#setState({ canLeadingExecute: false })\n      await this.#execute(...args)\n      return this.store.state.lastResult\n    }\n\n    // Handle trailing execution\n    if (this.options.trailing && this.#getEnabled()) {\n      this.#setState({ isPending: true })\n    }\n\n    return new Promise((resolve) => {\n      this.#resolvePreviousPromise = resolve\n      this.#timeoutId = setTimeout(async () => {\n        // Execute trailing if enabled\n        if (this.options.trailing && this.store.state.lastArgs) {\n          await this.#execute(...this.store.state.lastArgs)\n        }\n\n        // Reset state and resolve\n        this.#setState({ canLeadingExecute: true })\n        this.#resolvePreviousPromise = null\n        resolve(this.store.state.lastResult)\n      }, this.#getWait())\n    })\n  }\n\n  #execute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    if (!this.#getEnabled()) return undefined\n    this.#abortController = new AbortController()\n    try {\n      this.#setState({ isExecuting: true })\n      const result = await this.fn(...args) // EXECUTE!\n      this.#setState({\n        lastResult: result,\n        successCount: this.store.state.successCount + 1,\n      })\n      this.options.onSuccess?.(result, this)\n    } catch (error) {\n      this.#setState({\n        errorCount: this.store.state.errorCount + 1,\n      })\n      this.options.onError?.(error, this)\n      if (this.options.throwOnError) {\n        throw error\n      }\n    } finally {\n      this.#setState({\n        isExecuting: false,\n        isPending: false,\n        settleCount: this.store.state.settleCount + 1,\n      })\n      this.#abortController = null\n      this.options.onSettled?.(this)\n    }\n    return this.store.state.lastResult\n  }\n\n  /**\n   * Processes the current pending execution immediately\n   */\n  flush = (): void => {\n    if (this.store.state.isPending && this.store.state.lastArgs) {\n      this.#abortExecution() // abort any current execution\n      this.#clearTimeout() // clear any existing timeout\n      this.#execute(...this.store.state.lastArgs)\n    }\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = null\n    }\n  }\n\n  #cancelPendingExecution = (): void => {\n    this.#clearTimeout()\n    if (this.#resolvePreviousPromise) {\n      this.#resolvePreviousPromise(this.store.state.lastResult)\n      this.#resolvePreviousPromise = null\n    }\n    this.#setState({\n      isPending: false,\n      isExecuting: false,\n      lastArgs: undefined,\n    })\n  }\n\n  #abortExecution = (): void => {\n    if (this.#abortController) {\n      this.#abortController.abort()\n      this.#abortController = null\n    }\n  }\n\n  /**\n   * Cancels any pending execution or aborts any execution in progress\n   */\n  cancel = (): void => {\n    this.#cancelPendingExecution()\n    this.#abortExecution()\n    this.#setState({ canLeadingExecute: true })\n  }\n\n  /**\n   * Resets the debouncer state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultAsyncDebouncerState<TFn>())\n  }\n}\n\n/**\n * Creates an async debounced function that delays execution until after a specified wait time.\n * The debounced function will only execute once the wait period has elapsed without any new calls.\n * If called again during the wait period, the timer resets and a new wait period begins.\n *\n * Unlike the non-async Debouncer, this async version supports returning values from the debounced function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the debounced function.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and debouncer instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - The error state can be checked using the underlying AsyncDebouncer instance\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async debouncer\n * - Use `onSuccess` callback to react to successful function execution and implement custom logic\n * - Use `onError` callback to react to function execution errors and implement custom error handling\n * - Use `onSettled` callback to react to function execution completion (success or error) and implement custom logic\n * - The state includes canLeadingExecute, error count, execution status, and success/settle counts\n * - State can be accessed via `asyncDebouncer.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `asyncDebouncer.state`\n *\n * @example\n * ```ts\n * const debounced = asyncDebounce(async (value: string) => {\n *   const result = await saveToAPI(value);\n *   return result; // Return value is preserved\n * }, {\n *   wait: 1000,\n *   onError: (error) => {\n *     console.error('API call failed:', error);\n *   },\n *   throwOnError: true // Will both log the error and throw it\n * });\n *\n * // Will only execute once, 1 second after the last call\n * // Returns the API response directly\n * const result = await debounced(\"third\");\n * ```\n */\nexport function asyncDebounce<TFn extends AnyAsyncFunction>(\n  fn: TFn,\n  initialOptions: AsyncDebouncerOptions<TFn>,\n) {\n  const asyncDebouncer = new AsyncDebouncer(fn, initialOptions)\n  return 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+{"version":3,"file":"async-debouncer.js","sources":["../../src/async-debouncer.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { AnyAsyncFunction, OptionalKeys } from './types'\n\nexport interface AsyncDebouncerState<TFn extends AnyAsyncFunction> {\n  /**\n   * Whether the debouncer can execute on the leading edge of the timeout\n   */\n  canLeadingExecute: boolean\n  /**\n   * Number of function executions that have resulted in errors\n   */\n  errorCount: number\n  /**\n   * Whether the debounced function is currently executing asynchronously\n   */\n  isExecuting: boolean\n  /**\n   * Whether the debouncer is waiting for the timeout to trigger execution\n   */\n  isPending: boolean\n  /**\n   * The arguments from the most recent call to maybeExecute\n   */\n  lastArgs: Parameters<TFn> | undefined\n  /**\n   * The result from the most recent successful function execution\n   */\n  lastResult: ReturnType<TFn> | undefined\n  /**\n   * Number of function executions that have completed (either successfully or with errors)\n   */\n  settleCount: number\n  /**\n   * Current execution status - 'idle' when not active, 'pending' when waiting, 'executing' when running, 'settled' when completed\n   */\n  status: 'disabled' | 'idle' | 'pending' | 'executing' | 'settled'\n  /**\n   * Number of function executions that have completed successfully\n   */\n  successCount: number\n}\n\nfunction getDefaultAsyncDebouncerState<\n  TFn extends AnyAsyncFunction,\n>(): AsyncDebouncerState<TFn> {\n  return structuredClone({\n    canLeadingExecute: true,\n    errorCount: 0,\n    isExecuting: false,\n    isPending: false,\n    lastArgs: undefined,\n    lastResult: undefined,\n    settleCount: 0,\n    successCount: 0,\n    status: 'idle',\n  })\n}\n\n/**\n * Options for configuring an async debounced function\n */\nexport interface AsyncDebouncerOptions<TFn extends AnyAsyncFunction> {\n  /**\n   * Whether the debouncer is enabled. When disabled, maybeExecute will not trigger any executions.\n   * Can be a boolean or a function that returns a boolean.\n   * Defaults to true.\n   */\n  enabled?: boolean | ((debouncer: AsyncDebouncer<TFn>) => boolean)\n  /**\n   * Initial state for the async debouncer\n   */\n  initialState?: Partial<AsyncDebouncerState<TFn>>\n  /**\n   * Whether to execute on the leading edge of the timeout.\n   * Defaults to false.\n   */\n  leading?: boolean\n  /**\n   * Optional error handler for when the debounced function throws.\n   * If provided, the handler will be called with the error and debouncer instance.\n   * This can be used alongside throwOnError - the handler will be called before any error is thrown.\n   */\n  onError?: (error: unknown, debouncer: AsyncDebouncer<TFn>) => void\n  /**\n   * Optional callback to call when the debounced function is executed\n   */\n  onSettled?: (debouncer: AsyncDebouncer<TFn>) => void\n  /**\n   * Optional callback to call when the debounced function is executed\n   */\n  onSuccess?: (result: ReturnType<TFn>, debouncer: AsyncDebouncer<TFn>) => void\n  /**\n   * Whether to throw errors when they occur.\n   * Defaults to true if no onError handler is provided, false if an onError handler is provided.\n   * Can be explicitly set to override these defaults.\n   */\n  throwOnError?: boolean\n  /**\n   * Whether to execute on the trailing edge of the timeout.\n   * Defaults to true.\n   */\n  trailing?: boolean\n  /**\n   * Delay in milliseconds to wait after the last call before executing.\n   * Can be a number or a function that returns a number.\n   * Defaults to 0ms\n   */\n  wait: number | ((debouncer: AsyncDebouncer<TFn>) => number)\n}\n\ntype AsyncDebouncerOptionsWithOptionalCallbacks = OptionalKeys<\n  AsyncDebouncerOptions<any>,\n  'initialState' | 'onError' | 'onSettled' | 'onSuccess'\n>\n\nconst defaultOptions: AsyncDebouncerOptionsWithOptionalCallbacks = {\n  enabled: true,\n  leading: false,\n  trailing: true,\n  wait: 0,\n}\n\n/**\n * A class that creates an async debounced function.\n *\n * Debouncing ensures that a function is only executed after a specified delay has passed since its last invocation.\n * Each new invocation resets the delay timer. This is useful for handling frequent events like window resizing\n * or input changes where you only want to execute the handler after the events have stopped occurring.\n *\n * Unlike throttling which allows execution at regular intervals, debouncing prevents any execution until\n * the function stops being called for the specified delay period.\n *\n * Unlike the non-async Debouncer, this async version supports returning values from the debounced function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the debounced function.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and debouncer instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying store\n *\n * State Management:\n * - The debouncer uses a reactive store for state management\n * - Use `initialState` to provide initial state values when creating the async debouncer\n * - The state includes canLeadingExecute, error count, execution status, and success/settle counts\n * - State can be accessed via the `store` property and its `state` getter\n * - The store is reactive and will notify subscribers of state changes\n *\n * @example\n * ```ts\n * const asyncDebouncer = new AsyncDebouncer(async (value: string) => {\n *   const results = await searchAPI(value);\n *   return results; // Return value is preserved\n * }, {\n *   wait: 500,\n *   onError: (error) => {\n *     console.error('Search failed:', error);\n *   }\n * });\n *\n * // Called on each keystroke but only executes after 500ms of no typing\n * // Returns the API response directly\n * const results = await asyncDebouncer.maybeExecute(inputElement.value);\n * ```\n */\nexport class AsyncDebouncer<TFn extends AnyAsyncFunction> {\n  readonly store: Store<Readonly<AsyncDebouncerState<TFn>>> = new Store<\n    AsyncDebouncerState<TFn>\n  >(getDefaultAsyncDebouncerState<TFn>())\n  options: AsyncDebouncerOptions<TFn>\n  #abortController: AbortController | null = null\n  #timeoutId: NodeJS.Timeout | null = null\n  #resolvePreviousPromise:\n    | ((value?: ReturnType<TFn> | undefined) => void)\n    | null = null\n  #rejectPreviousPromise: ((reason?: unknown) => void) | null = null\n\n  constructor(\n    private fn: TFn,\n    initialOptions: AsyncDebouncerOptions<TFn>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n      throwOnError: initialOptions.throwOnError ?? !initialOptions.onError,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the async debouncer options\n   */\n  setOptions = (newOptions: Partial<AsyncDebouncerOptions<TFn>>): void => {\n    this.options = { ...this.options, ...newOptions }\n\n    // Cancel pending execution if the debouncer is disabled\n    if (!this.#getEnabled()) {\n      this.cancel()\n    }\n  }\n\n  #setState = (newState: Partial<AsyncDebouncerState<TFn>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const { isPending, isExecuting, settleCount } = combinedState\n      return {\n        ...combinedState,\n        status: !this.#getEnabled()\n          ? 'disabled'\n          : isPending\n            ? 'pending'\n            : isExecuting\n              ? 'executing'\n              : settleCount > 0\n                ? 'settled'\n                : 'idle',\n      }\n    })\n  }\n\n  /**\n   * Returns the current debouncer enabled state\n   */\n  #getEnabled = (): boolean => {\n    return !!parseFunctionOrValue(this.options.enabled, this)\n  }\n\n  /**\n   * Returns the current debouncer wait state\n   */\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait, this)\n  }\n\n  /**\n   * Attempts to execute the debounced function.\n   * If a call is already in progress, it will be queued.\n   *\n   * Error Handling:\n   * - If the debounced function throws and no `onError` handler is configured,\n   *   the error will be thrown from this method.\n   * - If an `onError` handler is configured, errors will be caught and passed to the handler,\n   *   and this method will return undefined.\n   * - The error state can be checked using `getErrorCount()` and `getIsExecuting()`.\n   *\n   * @returns A promise that resolves with the function's return value, or undefined if an error occurred and was handled by onError\n   * @throws The error from the debounced function if no onError handler is configured\n   */\n  maybeExecute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    if (!this.#getEnabled()) return undefined\n    this.#cancelPendingExecution()\n    this.#setState({ lastArgs: args })\n\n    // Handle leading execution\n    if (this.options.leading && this.store.state.canLeadingExecute) {\n      this.#setState({ canLeadingExecute: false })\n      await this.#execute(...args)\n      return this.store.state.lastResult\n    }\n\n    // Handle trailing execution\n    if (this.options.trailing && this.#getEnabled()) {\n      this.#setState({ isPending: true })\n    }\n\n    return new Promise((resolve, reject) => {\n      this.#resolvePreviousPromise = resolve\n      this.#rejectPreviousPromise = reject\n      this.#timeoutId = setTimeout(async () => {\n        // Execute trailing if enabled\n        if (this.options.trailing && this.store.state.lastArgs) {\n          await this.#execute(...this.store.state.lastArgs)\n        }\n\n        // Reset state and resolve\n        this.#setState({ canLeadingExecute: true })\n        this.#resolvePreviousPromise = null\n        resolve(this.store.state.lastResult)\n      }, this.#getWait())\n    })\n  }\n\n  #execute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    if (!this.#getEnabled()) return undefined\n    this.#abortController = new AbortController()\n    try {\n      this.#setState({ isExecuting: true })\n      const result = await this.fn(...args) // EXECUTE!\n      this.#setState({\n        lastResult: result,\n        successCount: this.store.state.successCount + 1,\n      })\n      this.options.onSuccess?.(result, this)\n    } catch (error) {\n      this.#setState({\n        errorCount: this.store.state.errorCount + 1,\n      })\n      this.options.onError?.(error, this)\n      if (this.options.throwOnError) {\n        this.#rejectPreviousPromiseInternal(error)\n      }\n    } finally {\n      this.#setState({\n        isExecuting: false,\n        isPending: false,\n        settleCount: this.store.state.settleCount + 1,\n      })\n      this.#abortController = null\n      this.options.onSettled?.(this)\n    }\n    return this.store.state.lastResult\n  }\n\n  /**\n   * Processes the current pending execution immediately\n   */\n  flush = async (): Promise<ReturnType<TFn> | undefined> => {\n    if (this.store.state.isPending && this.store.state.lastArgs) {\n      this.#abortExecution() // abort any current execution\n      this.#clearTimeout() // clear any existing timeout\n      const result = await this.#execute(...this.store.state.lastArgs)\n\n      // Resolve any pending promise from maybeExecute\n      this.#resolvePreviousPromiseInternal()\n\n      return result\n    }\n    return undefined\n  }\n\n  #resolvePreviousPromiseInternal = (): void => {\n    if (this.#resolvePreviousPromise) {\n      this.#resolvePreviousPromise(this.store.state.lastResult)\n      this.#resolvePreviousPromise = null\n    }\n  }\n\n  #rejectPreviousPromiseInternal = (error: unknown): void => {\n    if (this.#rejectPreviousPromise) {\n      this.#rejectPreviousPromise(error)\n      this.#rejectPreviousPromise = null\n    }\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = null\n    }\n  }\n\n  #cancelPendingExecution = (): void => {\n    this.#clearTimeout()\n    this.#resolvePreviousPromiseInternal()\n    this.#setState({\n      isPending: false,\n      isExecuting: false,\n      lastArgs: undefined,\n    })\n  }\n\n  #abortExecution = (): void => {\n    if (this.#abortController) {\n      this.#abortController.abort()\n      this.#abortController = null\n    }\n  }\n\n  /**\n   * Cancels any pending execution or aborts any execution in progress\n   */\n  cancel = (): void => {\n    this.#cancelPendingExecution()\n    this.#abortExecution()\n    this.#setState({ canLeadingExecute: true })\n  }\n\n  /**\n   * Resets the debouncer state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultAsyncDebouncerState<TFn>())\n  }\n}\n\n/**\n * Creates an async debounced function that delays execution until after a specified wait time.\n * The debounced function will only execute once the wait period has elapsed without any new calls.\n * If called again during the wait period, the timer resets and a new wait period begins.\n *\n * Unlike the non-async Debouncer, this async version supports returning values from the debounced function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the debounced function.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and debouncer instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - The error state can be checked using the underlying AsyncDebouncer instance\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async debouncer\n * - Use `onSuccess` callback to react to successful function execution and implement custom logic\n * - Use `onError` callback to react to function execution errors and implement custom error handling\n * - Use `onSettled` callback to react to function execution completion (success or error) and implement custom logic\n * - The state includes canLeadingExecute, error count, execution status, and 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dist/esm/async-queuer.d.ts

@@ -33,2 +33,6 @@ import { Store } from '@tanstack/store';
     /**
+     * Array of items currently waiting to be processed
+     */
+    items: Array<TValue>;
+    /**
      * Timestamps when items were added to the queue for expiration tracking
@@ -38,6 +42,2 @@ */
     /**
-     * Array of items currently waiting to be processed
-     */
-    items: Array<TValue>;
-    /**
      * The result from the most recent task execution
@@ -259,4 +259,9 @@ */
      */
-    flush: (numberOfItems?: number, position?: QueuePosition) => void;
+    flush: (numberOfItems?: number, position?: QueuePosition) => Promise<void>;
     /**
+     * Processes all items in the queue as a batch using the provided function
+     * The queue is cleared after processing
+     */
+    flushAsBatch: (batchFunction: (items: Array<TValue>) => Promise<any>) => Promise<void>;
+    /**
      * Returns the next item in the queue without removing it.
@@ -263,0 +268,0 @@ *

dist/esm/async-queuer.js

@@ -171,2 +171,7 @@ import { Store } from "@tanstack/store";
     };
+    this.#getAllItems = () => {
+      const items = this.peekAllItems();
+      this.clear();
+      return items;
+    };
     this.execute = async (position) => {
@@ -202,8 +207,13 @@ const item = this.getNextItem(position);
     };
-    this.flush = (numberOfItems = this.store.state.items.length, position) => {
+    this.flush = async (numberOfItems = this.store.state.items.length, position) => {
       this.#clearTimeouts();
-      for (let i = 0; i < numberOfItems; i++) {
-        this.execute(position);
-      }
+      await Promise.all(
+        Array.from({ length: numberOfItems }, () => this.execute(position))
+      );
     };
+    this.flushAsBatch = async (batchFunction) => {
+      this.#clearTimeouts();
+      const items = this.#getAllItems();
+      await batchFunction(items);
+    };
     this.#checkExpiredItems = () => {
@@ -309,2 +319,3 @@ if ((this.options.expirationDuration ?? Infinity) === Infinity && this.options.getIsExpired === defaultOptions.getIsExpired) {
   #tick;
+  #getAllItems;
   #checkExpiredItems;
@@ -311,0 +322,0 @@ #clearTimeouts;

dist/esm/async-queuer.js.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"async-queuer.js","sources":["../../src/async-queuer.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { OptionalKeys } from './types'\nimport type { QueuePosition } from './queuer'\n\nexport interface AsyncQueuerState<TValue> {\n  /**\n   * Items currently being processed by the queuer\n   */\n  activeItems: Array<TValue>\n  /**\n   * Number of task executions that have resulted in errors\n   */\n  errorCount: number\n  /**\n   * Number of items that have been removed from the queue due to expiration\n   */\n  expirationCount: number\n  /**\n   * Whether the queuer has no items to process (items array is empty)\n   */\n  isEmpty: boolean\n  /**\n   * Whether the queuer has reached its maximum capacity\n   */\n  isFull: boolean\n  /**\n   * Whether the queuer is not currently processing any items\n   */\n  isIdle: boolean\n  /**\n   * Whether the queuer is active and will process items automatically\n   */\n  isRunning: boolean\n  /**\n   * Timestamps when items were added to the queue for expiration tracking\n   */\n  itemTimestamps: Array<number>\n  /**\n   * Array of items currently waiting to be processed\n   */\n  items: Array<TValue>\n  /**\n   * The result from the most recent task execution\n   */\n  lastResult: any\n  /**\n   * Whether the queuer has a pending timeout for processing the next item\n   */\n  pendingTick: boolean\n  /**\n   * Number of items that have been rejected from being added to the queue\n   */\n  rejectionCount: number\n  /**\n   * Number of task executions that have completed (either successfully or with errors)\n   */\n  settledCount: number\n  /**\n   * Number of items currently in the queue\n   */\n  size: number\n  /**\n   * Current processing status - 'idle' when not processing, 'running' when active, 'stopped' when paused\n   */\n  status: 'idle' | 'running' | 'stopped'\n  /**\n   * Number of task executions that have completed successfully\n   */\n  successCount: number\n}\n\nfunction getDefaultAsyncQueuerState<TValue>(): AsyncQueuerState<TValue> {\n  return structuredClone({\n    activeItems: [],\n    errorCount: 0,\n    expirationCount: 0,\n    isEmpty: true,\n    isFull: false,\n    isIdle: true,\n    isRunning: true,\n    itemTimestamps: [],\n    items: [],\n    lastResult: null,\n    pendingTick: false,\n    rejectionCount: 0,\n    settledCount: 0,\n    size: 0,\n    status: 'idle',\n    successCount: 0,\n  })\n}\n\nexport interface AsyncQueuerOptions<TValue> {\n  /**\n   * Default position to add items to the queuer\n   * @default 'back'\n   */\n  addItemsTo?: QueuePosition\n  /**\n   * Maximum number of concurrent tasks to process.\n   * Can be a number or a function that returns a number.\n   * @default 1\n   */\n  concurrency?: number | ((queuer: AsyncQueuer<TValue>) => number)\n  /**\n   * Maximum time in milliseconds that an item can stay in the queue\n   * If not provided, items will never expire\n   */\n  expirationDuration?: number\n  /**\n   * Function to determine if an item has expired\n   * If provided, this overrides the expirationDuration behavior\n   */\n  getIsExpired?: (item: TValue, addedAt: number) => boolean\n  /**\n   * Default position to get items from during processing\n   * @default 'front'\n   */\n  getItemsFrom?: QueuePosition\n  /**\n   * Function to determine priority of items in the queuer\n   * Higher priority items will be processed first\n   * If not provided, will use static priority values attached to tasks\n   */\n  getPriority?: (item: TValue) => number\n  /**\n   * Initial items to populate the queuer with\n   */\n  initialItems?: Array<TValue>\n  /**\n   * Initial state for the async queuer\n   */\n  initialState?: Partial<AsyncQueuerState<TValue>>\n  /**\n   * Maximum number of items allowed in the queuer\n   */\n  maxSize?: number\n  /**\n   * Optional error handler for when a task throws.\n   * If provided, the handler will be called with the error and queuer instance.\n   * This can be used alongside throwOnError - the handler will be called before any error is thrown.\n   */\n  onError?: (error: unknown, queuer: AsyncQueuer<TValue>) => void\n  /**\n   * Callback fired whenever an item expires in the queuer\n   */\n  onExpire?: (item: TValue, queuer: AsyncQueuer<TValue>) => void\n  /**\n   * Callback fired whenever an item is added or removed from the queuer\n   */\n  onItemsChange?: (queuer: AsyncQueuer<TValue>) => void\n  /**\n   * Callback fired whenever an item is rejected from being added to the queuer\n   */\n  onReject?: (item: TValue, queuer: AsyncQueuer<TValue>) => void\n  /**\n   * Optional callback to call when a task is settled\n   */\n  onSettled?: (queuer: AsyncQueuer<TValue>) => void\n  /**\n   * Optional callback to call when a task succeeds\n   */\n  onSuccess?: (result: TValue, queuer: AsyncQueuer<TValue>) => void\n  /**\n   * Whether the queuer should start processing tasks immediately or not.\n   */\n  started?: boolean\n  /**\n   * Whether to throw errors when they occur.\n   * Defaults to true if no onError handler is provided, false if an onError handler is provided.\n   * Can be explicitly set to override these defaults.\n   */\n  throwOnError?: boolean\n  /**\n   * Time in milliseconds to wait between processing items.\n   * Can be a number or a function that returns a number.\n   * @default 0\n   */\n  wait?: number | ((queuer: AsyncQueuer<TValue>) => number)\n}\n\ntype AsyncQueuerOptionsWithOptionalCallbacks = OptionalKeys<\n  Required<AsyncQueuerOptions<any>>,\n  | 'initialState'\n  | 'throwOnError'\n  | 'onSuccess'\n  | 'onSettled'\n  | 'onReject'\n  | 'onItemsChange'\n  | 'onExpire'\n  | 'onError'\n>\n\nconst defaultOptions: AsyncQueuerOptionsWithOptionalCallbacks = {\n  addItemsTo: 'back',\n  concurrency: 1,\n  expirationDuration: Infinity,\n  getIsExpired: () => false,\n  getItemsFrom: 'front',\n  getPriority: (item: any) => item?.priority ?? 0,\n  initialItems: [],\n  maxSize: Infinity,\n  started: true,\n  wait: 0,\n}\n\n/**\n * A flexible asynchronous queue for processing tasks with configurable concurrency, priority, and expiration.\n *\n * Features:\n * - Priority queue support via the getPriority option\n * - Configurable concurrency limit\n * - Callbacks for task success, error, completion, and queue state changes\n * - FIFO (First In First Out) or LIFO (Last In First Out) queue behavior\n * - Pause and resume processing\n * - Task cancellation\n * - Item expiration to remove stale items from the queue\n *\n * Tasks are processed concurrently up to the configured concurrency limit. When a task completes,\n * the next pending task is processed if the concurrency limit allows.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and queuer instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together; the handler will be called before any error is thrown\n * - The error state can be checked using the AsyncQueuer instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async queuer\n * - Use `onSuccess` callback to react to successful task execution and implement custom logic\n * - Use `onError` callback to react to task execution errors and implement custom error handling\n * - Use `onSettled` callback to react to task execution completion (success or error) and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the queue\n * - Use `onExpire` callback to react to items expiring and implement custom logic\n * - Use `onReject` callback to react to items being rejected when the queue is full\n * - The state includes error count, expiration count, rejection count, running status, and success/settle counts\n * - State can be accessed via `asyncQueuer.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `asyncQueuer.state`\n *\n * Example usage:\n * ```ts\n * const asyncQueuer = new AsyncQueuer<string>(async (item) => {\n *   // process item\n *   return item.toUpperCase();\n * }, {\n *   concurrency: 2,\n *   onSuccess: (result) => {\n *     console.log(result);\n *   }\n * });\n *\n * asyncQueuer.addItem('hello');\n * asyncQueuer.start();\n * ```\n */\nexport class AsyncQueuer<TValue> {\n  readonly store: Store<Readonly<AsyncQueuerState<TValue>>> = new Store<\n    AsyncQueuerState<TValue>\n  >(getDefaultAsyncQueuerState<TValue>())\n  options: AsyncQueuerOptions<TValue>\n  #timeoutIds: Set<NodeJS.Timeout> = new Set()\n\n  constructor(\n    private fn: (item: TValue) => Promise<any>,\n    initialOptions: AsyncQueuerOptions<TValue> = {},\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n      throwOnError: initialOptions.throwOnError ?? !initialOptions.onError,\n    }\n    const isInitiallyRunning =\n      this.options.initialState?.isRunning ?? this.options.started ?? true\n    this.#setState({\n      ...this.options.initialState,\n      isRunning: isInitiallyRunning,\n    })\n\n    if (this.options.initialState?.items) {\n      if (this.store.state.isRunning) {\n        this.#tick()\n      }\n    } else {\n      for (let i = 0; i < (this.options.initialItems?.length ?? 0); i++) {\n        const item = this.options.initialItems![i]!\n        const isLast = i === (this.options.initialItems?.length ?? 0) - 1\n        this.addItem(item, this.options.addItemsTo ?? 'back', isLast)\n      }\n    }\n  }\n\n  /**\n   * Updates the queuer options. New options are merged with existing options.\n   */\n  setOptions = (newOptions: Partial<AsyncQueuerOptions<TValue>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<AsyncQueuerState<TValue>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n\n      const { activeItems, items, isRunning } = combinedState\n\n      const size = items.length\n      const isFull = size >= (this.options.maxSize ?? Infinity)\n      const isEmpty = size === 0\n      const isIdle = isRunning && isEmpty && activeItems.length === 0\n\n      const status = isIdle ? 'idle' : isRunning ? 'running' : 'stopped'\n\n      return {\n        ...combinedState,\n        isEmpty,\n        isFull,\n        isIdle,\n        size,\n        status,\n      }\n    })\n  }\n\n  /**\n   * Returns the current wait time (in milliseconds) between processing items.\n   * If a function is provided, it is called with the queuer instance.\n   */\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait ?? 0, this)\n  }\n\n  /**\n   * Returns the current concurrency limit for processing items.\n   * If a function is provided, it is called with the queuer instance.\n   */\n  #getConcurrency = (): number => {\n    return parseFunctionOrValue(this.options.concurrency ?? 1, this)\n  }\n\n  /**\n   * Processes items in the queue up to the concurrency limit. Internal use only.\n   */\n  #tick = () => {\n    if (!this.store.state.isRunning) {\n      this.#setState({ pendingTick: false })\n      return\n    }\n    this.#setState({ pendingTick: true })\n\n    // Check for expired items\n    this.#checkExpiredItems()\n\n    // Process items concurrently up to the concurrency limit\n    const activeItems = this.store.state.activeItems\n    while (\n      activeItems.length < this.#getConcurrency() &&\n      this.store.state.items.length > 0\n    ) {\n      const nextItem = this.peekNextItem()\n      if (!nextItem) {\n        break\n      }\n      activeItems.push(nextItem)\n      this.#setState({\n        activeItems,\n      })\n      ;(async () => {\n        const result = await this.execute()\n        this.#setState({ lastResult: result })\n\n        const wait = this.#getWait()\n        if (wait > 0) {\n          const timeoutId = setTimeout(() => this.#tick(), wait)\n          this.#timeoutIds.add(timeoutId)\n          return\n        }\n\n        this.#tick()\n      })()\n    }\n\n    this.#setState({ pendingTick: false })\n  }\n\n  /**\n   * Adds an item to the queue. If the queue is full, the item is rejected and onReject is called.\n   * Items can be inserted based on priority or at the front/back depending on configuration.\n   *\n   * @example\n   * ```ts\n   * queuer.addItem({ value: 'task', priority: 10 });\n   * queuer.addItem('task2', 'front');\n   * ```\n   */\n  addItem = (\n    item: TValue,\n    position: QueuePosition = this.options.addItemsTo ?? 'back',\n    runOnItemsChange: boolean = true,\n  ): boolean => {\n    if (this.store.state.items.length >= (this.options.maxSize ?? Infinity)) {\n      this.#setState({\n        rejectionCount: this.store.state.rejectionCount + 1,\n      })\n      this.options.onReject?.(item, this)\n      return false\n    }\n\n    // Get priority either from the function or from getPriority option\n    const priority =\n      this.options.getPriority !== defaultOptions.getPriority\n        ? this.options.getPriority!(item)\n        : (item as any).priority\n\n    const items = this.store.state.items\n    const itemTimestamps = this.store.state.itemTimestamps\n\n    if (priority !== undefined) {\n      // Insert based on priority - higher priority items go to front\n      const insertIndex = items.findIndex((existing) => {\n        const existingPriority =\n          this.options.getPriority !== defaultOptions.getPriority\n            ? this.options.getPriority!(existing)\n            : (existing as any).priority\n        return existingPriority < priority\n      })\n\n      if (insertIndex === -1) {\n        items.push(item)\n        itemTimestamps.push(Date.now())\n      } else {\n        items.splice(insertIndex, 0, item)\n        itemTimestamps.splice(insertIndex, 0, Date.now())\n      }\n    } else {\n      if (position === 'front') {\n        // Default FIFO/LIFO behavior\n        items.unshift(item)\n        itemTimestamps.unshift(Date.now())\n      } else {\n        // LIFO\n        items.push(item)\n        itemTimestamps.push(Date.now())\n      }\n    }\n\n    this.#setState({\n      items,\n      itemTimestamps,\n    })\n\n    if (runOnItemsChange) {\n      this.options.onItemsChange?.(this)\n    }\n\n    if (this.store.state.isRunning && !this.store.state.pendingTick) {\n      this.#tick()\n    }\n\n    return true\n  }\n\n  /**\n   * Removes and returns the next item from the queue without executing the task function.\n   * Use for manual queue management. Normally, use execute() to process items.\n   *\n   * @example\n   * ```ts\n   * // FIFO\n   * queuer.getNextItem();\n   * // LIFO\n   * queuer.getNextItem('back');\n   * ```\n   */\n  getNextItem = (\n    position: QueuePosition = this.options.getItemsFrom ?? 'front',\n  ): TValue | undefined => {\n    const { items, itemTimestamps } = this.store.state\n    let item: TValue | undefined\n\n    if (position === 'front') {\n      item = items[0]\n      if (item !== undefined) {\n        this.#setState({\n          items: items.slice(1),\n          itemTimestamps: itemTimestamps.slice(1),\n        })\n      }\n    } else {\n      item = items[items.length - 1]\n      if (item !== undefined) {\n        this.#setState({\n          items: items.slice(0, -1),\n          itemTimestamps: itemTimestamps.slice(0, -1),\n        })\n      }\n    }\n\n    if (item !== undefined) {\n      this.options.onItemsChange?.(this)\n    }\n\n    return item\n  }\n\n  /**\n   * Removes and returns the next item from the queue and executes the task function with it.\n   *\n   * @example\n   * ```ts\n   * queuer.execute();\n   * // LIFO\n   * queuer.execute('back');\n   * ```\n   */\n  execute = async (position?: QueuePosition): Promise<any> => {\n    const item = this.getNextItem(position)\n    if (item !== undefined) {\n      try {\n        const lastResult = await this.fn(item)\n        this.#setState({\n          successCount: this.store.state.successCount + 1,\n          lastResult,\n        })\n        this.options.onSuccess?.(lastResult, this)\n      } catch (error) {\n        this.#setState({\n          errorCount: this.store.state.errorCount + 1,\n        })\n        this.options.onError?.(error, this)\n        if (this.options.throwOnError) {\n          throw error\n        }\n      } finally {\n        this.#setState({\n          activeItems: this.store.state.activeItems.filter(\n            (activeItem) => activeItem !== item,\n          ),\n          settledCount: this.store.state.settledCount + 1,\n        })\n        this.options.onSettled?.(this)\n      }\n    }\n    return item\n  }\n\n  /**\n   * Processes a specified number of items to execute immediately with no wait time\n   * If no numberOfItems is provided, all items will be processed\n   */\n  flush = (\n    numberOfItems: number = this.store.state.items.length,\n    position?: QueuePosition,\n  ): void => {\n    this.#clearTimeouts() // clear any pending timeouts\n    for (let i = 0; i < numberOfItems; i++) {\n      this.execute(position)\n    }\n  }\n\n  /**\n   * Checks for expired items in the queue and removes them. Calls onExpire for each expired item.\n   * Internal use only.\n   */\n  #checkExpiredItems = (): void => {\n    if (\n      (this.options.expirationDuration ?? Infinity) === Infinity &&\n      this.options.getIsExpired === defaultOptions.getIsExpired\n    ) {\n      return\n    }\n\n    const now = Date.now()\n    const expiredIndices: Array<number> = []\n\n    // Find indices of expired items\n    for (let i = 0; i < this.store.state.items.length; i++) {\n      const timestamp = this.store.state.itemTimestamps[i]\n      if (timestamp === undefined) continue\n\n      const item = this.store.state.items[i]\n      if (item === undefined) continue\n\n      const isExpired =\n        this.options.getIsExpired !== defaultOptions.getIsExpired\n          ? this.options.getIsExpired!(item, timestamp)\n          : now - timestamp > (this.options.expirationDuration ?? Infinity)\n\n      if (isExpired) {\n        expiredIndices.push(i)\n      }\n    }\n\n    // Remove expired items from back to front to maintain indices\n    for (let i = expiredIndices.length - 1; i >= 0; i--) {\n      const index = expiredIndices[i]\n      if (index === undefined) continue\n\n      const expiredItem = this.store.state.items[index]\n      if (expiredItem === undefined) continue\n\n      const newItems = [...this.store.state.items]\n      const newTimestamps = [...this.store.state.itemTimestamps]\n      newItems.splice(index, 1)\n      newTimestamps.splice(index, 1)\n      this.#setState({\n        items: newItems,\n        itemTimestamps: newTimestamps,\n        expirationCount: this.store.state.expirationCount + 1,\n      })\n      this.options.onExpire?.(expiredItem, this)\n    }\n\n    if (expiredIndices.length > 0) {\n      this.options.onItemsChange?.(this)\n    }\n  }\n\n  /**\n   * Returns the next item in the queue without removing it.\n   *\n   * @example\n   * ```ts\n   * queuer.peekNextItem(); // front\n   * queuer.peekNextItem('back'); // back\n   * ```\n   */\n  peekNextItem = (position: QueuePosition = 'front'): TValue | undefined => {\n    if (position === 'front') {\n      return this.store.state.items[0]\n    }\n    return this.store.state.items[this.store.state.items.length - 1]\n  }\n\n  /**\n   * Returns a copy of all items in the queue, including active and pending items.\n   */\n  peekAllItems = (): Array<TValue> => {\n    return [...this.peekActiveItems(), ...this.peekPendingItems()]\n  }\n\n  /**\n   * Returns the items currently being processed (active tasks).\n   */\n  peekActiveItems = (): Array<TValue> => {\n    return [...this.store.state.activeItems]\n  }\n\n  /**\n   * Returns the items waiting to be processed (pending tasks).\n   */\n  peekPendingItems = (): Array<TValue> => {\n    return [...this.store.state.items]\n  }\n\n  /**\n   * Starts processing items in the queue. If already running, does nothing.\n   */\n  start = (): void => {\n    this.#setState({ isRunning: true })\n    if (!this.store.state.pendingTick && this.store.state.items.length > 0) {\n      this.#tick()\n    }\n  }\n\n  /**\n   * Stops processing items in the queue. Does not clear the queue.\n   */\n  stop = (): void => {\n    this.#clearTimeouts()\n    this.#setState({ isRunning: false, pendingTick: false })\n  }\n\n  #clearTimeouts = (): void => {\n    this.#timeoutIds.forEach((timeoutId) => clearTimeout(timeoutId))\n    this.#timeoutIds.clear()\n  }\n\n  /**\n   * Removes all pending items from the queue. Does not affect active tasks.\n   */\n  clear = (): void => {\n    this.#setState({ items: [], itemTimestamps: [] })\n    this.options.onItemsChange?.(this)\n  }\n\n  /**\n   * Resets the queuer state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultAsyncQueuerState<TValue>())\n    this.options.onItemsChange?.(this)\n  }\n}\n\n/**\n * Creates a new AsyncQueuer instance and returns a bound addItem function for adding tasks.\n * The queuer is started automatically and ready to process items.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and queuer instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together; the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncQueuer instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async queuer\n * - Use `onSuccess` callback to react to successful task execution and implement custom logic\n * - Use `onError` callback to react to task execution errors and implement custom error handling\n * - Use `onSettled` callback to react to task execution completion (success or error) and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the queue\n * - Use `onExpire` callback to react to items expiring and implement custom logic\n * - Use `onReject` callback to react to items being rejected when the queue is full\n * - The state includes error count, expiration count, rejection count, running status, and success/settle counts\n * - State can be accessed via the underlying AsyncQueuer instance's `store.state` property\n 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Priority queue support via the getPriority option\n * - Configurable concurrency limit\n * - Callbacks for task success, error, completion, and queue state changes\n * - FIFO (First In First Out) or LIFO (Last In First Out) queue behavior\n * - Pause and resume processing\n * - Task cancellation\n * - Item expiration to remove stale items from the queue\n *\n * Tasks are processed concurrently up to the configured concurrency limit. When a task completes,\n * the next pending task is processed if the concurrency limit allows.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and queuer instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together; the handler will be called before any error is thrown\n * - The error state can be checked using the AsyncQueuer instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async queuer\n * - Use `onSuccess` callback to react to successful task execution and implement custom logic\n * - Use `onError` callback to react to task execution errors and implement custom error handling\n * - Use `onSettled` callback to react to task execution completion (success or error) and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the queue\n * - Use `onExpire` callback to react to items expiring and implement custom logic\n * - Use `onReject` callback to react to items being rejected when the queue is full\n * - The state includes error count, expiration count, rejection count, running status, and success/settle counts\n * - State can be accessed via `asyncQueuer.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `asyncQueuer.state`\n *\n * Example usage:\n * ```ts\n * const asyncQueuer = new AsyncQueuer<string>(async (item) => {\n *   // process item\n *   return item.toUpperCase();\n * }, {\n *   concurrency: 2,\n *   onSuccess: (result) => {\n *     console.log(result);\n *   }\n * });\n *\n * asyncQueuer.addItem('hello');\n * asyncQueuer.start();\n * ```\n */\nexport class AsyncQueuer<TValue> {\n  readonly store: Store<Readonly<AsyncQueuerState<TValue>>> = new Store<\n    AsyncQueuerState<TValue>\n  >(getDefaultAsyncQueuerState<TValue>())\n  options: AsyncQueuerOptions<TValue>\n  #timeoutIds: Set<NodeJS.Timeout> = new Set()\n\n  constructor(\n    private fn: (item: TValue) => Promise<any>,\n    initialOptions: AsyncQueuerOptions<TValue> = {},\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n      throwOnError: initialOptions.throwOnError ?? !initialOptions.onError,\n    }\n    const isInitiallyRunning =\n      this.options.initialState?.isRunning ?? this.options.started ?? true\n    this.#setState({\n      ...this.options.initialState,\n      isRunning: isInitiallyRunning,\n    })\n\n    if (this.options.initialState?.items) {\n      if (this.store.state.isRunning) {\n        this.#tick()\n      }\n    } else {\n      for (let i = 0; i < (this.options.initialItems?.length ?? 0); i++) {\n        const item = this.options.initialItems![i]!\n        const isLast = i === (this.options.initialItems?.length ?? 0) - 1\n        this.addItem(item, this.options.addItemsTo ?? 'back', isLast)\n      }\n    }\n  }\n\n  /**\n   * Updates the queuer options. New options are merged with existing options.\n   */\n  setOptions = (newOptions: Partial<AsyncQueuerOptions<TValue>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<AsyncQueuerState<TValue>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n\n      const { activeItems, items, isRunning } = combinedState\n\n      const size = items.length\n      const isFull = size >= (this.options.maxSize ?? Infinity)\n      const isEmpty = size === 0\n      const isIdle = isRunning && isEmpty && activeItems.length === 0\n\n      const status = isIdle ? 'idle' : isRunning ? 'running' : 'stopped'\n\n      return {\n        ...combinedState,\n        isEmpty,\n        isFull,\n        isIdle,\n        size,\n        status,\n      }\n    })\n  }\n\n  /**\n   * Returns the current wait time (in milliseconds) between processing items.\n   * If a function is provided, it is called with the queuer instance.\n   */\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait ?? 0, this)\n  }\n\n  /**\n   * Returns the current concurrency limit for processing items.\n   * If a function is provided, it is called with the queuer instance.\n   */\n  #getConcurrency = (): number => {\n    return parseFunctionOrValue(this.options.concurrency ?? 1, this)\n  }\n\n  /**\n   * Processes items in the queue up to the concurrency limit. Internal use only.\n   */\n  #tick = () => {\n    if (!this.store.state.isRunning) {\n      this.#setState({ pendingTick: false })\n      return\n    }\n    this.#setState({ pendingTick: true })\n\n    // Check for expired items\n    this.#checkExpiredItems()\n\n    // Process items concurrently up to the concurrency limit\n    const activeItems = this.store.state.activeItems\n    while (\n      activeItems.length < this.#getConcurrency() &&\n      this.store.state.items.length > 0\n    ) {\n      const nextItem = this.peekNextItem()\n      if (!nextItem) {\n        break\n      }\n      activeItems.push(nextItem)\n      this.#setState({\n        activeItems,\n      })\n      ;(async () => {\n        const result = await this.execute()\n        this.#setState({ lastResult: result })\n\n        const wait = this.#getWait()\n        if (wait > 0) {\n          const timeoutId = setTimeout(() => this.#tick(), wait)\n          this.#timeoutIds.add(timeoutId)\n          return\n        }\n\n        this.#tick()\n      })()\n    }\n\n    this.#setState({ pendingTick: false })\n  }\n\n  /**\n   * Adds an item to the queue. If the queue is full, the item is rejected and onReject is called.\n   * Items can be inserted based on priority or at the front/back depending on configuration.\n   *\n   * @example\n   * ```ts\n   * queuer.addItem({ value: 'task', priority: 10 });\n   * queuer.addItem('task2', 'front');\n   * ```\n   */\n  addItem = (\n    item: TValue,\n    position: QueuePosition = this.options.addItemsTo ?? 'back',\n    runOnItemsChange: boolean = true,\n  ): boolean => {\n    if (this.store.state.items.length >= (this.options.maxSize ?? Infinity)) {\n      this.#setState({\n        rejectionCount: this.store.state.rejectionCount + 1,\n      })\n      this.options.onReject?.(item, this)\n      return false\n    }\n\n    // Get priority either from the function or from getPriority option\n    const priority =\n      this.options.getPriority !== defaultOptions.getPriority\n        ? this.options.getPriority!(item)\n        : (item as any).priority\n\n    const items = this.store.state.items\n    const itemTimestamps = this.store.state.itemTimestamps\n\n    if (priority !== undefined) {\n      // Insert based on priority - higher priority items go to front\n      const insertIndex = items.findIndex((existing) => {\n        const existingPriority =\n          this.options.getPriority !== defaultOptions.getPriority\n            ? this.options.getPriority!(existing)\n            : (existing as any).priority\n        return existingPriority < priority\n      })\n\n      if (insertIndex === -1) {\n        items.push(item)\n        itemTimestamps.push(Date.now())\n      } else {\n        items.splice(insertIndex, 0, item)\n        itemTimestamps.splice(insertIndex, 0, Date.now())\n      }\n    } else {\n      if (position === 'front') {\n        // Default FIFO/LIFO behavior\n        items.unshift(item)\n        itemTimestamps.unshift(Date.now())\n      } else {\n        // LIFO\n        items.push(item)\n        itemTimestamps.push(Date.now())\n      }\n    }\n\n    this.#setState({\n      items,\n      itemTimestamps,\n    })\n\n    if (runOnItemsChange) {\n      this.options.onItemsChange?.(this)\n    }\n\n    if (this.store.state.isRunning && !this.store.state.pendingTick) {\n      this.#tick()\n    }\n\n    return true\n  }\n\n  /**\n   * Removes and returns the next item from the queue without executing the task function.\n   * Use for manual queue management. Normally, use execute() to process items.\n   *\n   * @example\n   * ```ts\n   * // FIFO\n   * queuer.getNextItem();\n   * // LIFO\n   * queuer.getNextItem('back');\n   * ```\n   */\n  getNextItem = (\n    position: QueuePosition = this.options.getItemsFrom ?? 'front',\n  ): TValue | undefined => {\n    const { items, itemTimestamps } = this.store.state\n    let item: TValue | undefined\n\n    if (position === 'front') {\n      item = items[0]\n      if (item !== undefined) {\n        this.#setState({\n          items: items.slice(1),\n          itemTimestamps: itemTimestamps.slice(1),\n        })\n      }\n    } else {\n      item = items[items.length - 1]\n      if (item !== undefined) {\n        this.#setState({\n          items: items.slice(0, -1),\n          itemTimestamps: itemTimestamps.slice(0, -1),\n        })\n      }\n    }\n\n    if (item !== undefined) {\n      this.options.onItemsChange?.(this)\n    }\n\n    return item\n  }\n\n  #getAllItems = (): Array<TValue> => {\n    const items = this.peekAllItems()\n    this.clear()\n    return items\n  }\n\n  /**\n   * Removes and returns the next item from the queue and executes the task function with it.\n   *\n   * @example\n   * ```ts\n   * queuer.execute();\n   * // LIFO\n   * queuer.execute('back');\n   * ```\n   */\n  execute = async (position?: QueuePosition): Promise<any> => {\n    const item = this.getNextItem(position)\n    if (item !== undefined) {\n      try {\n        const lastResult = await this.fn(item)\n        this.#setState({\n          successCount: this.store.state.successCount + 1,\n          lastResult,\n        })\n        this.options.onSuccess?.(lastResult, this)\n      } catch (error) {\n        this.#setState({\n          errorCount: this.store.state.errorCount + 1,\n        })\n        this.options.onError?.(error, this)\n        if (this.options.throwOnError) {\n          throw error\n        }\n      } finally {\n        this.#setState({\n          activeItems: this.store.state.activeItems.filter(\n            (activeItem) => activeItem !== item,\n          ),\n          settledCount: this.store.state.settledCount + 1,\n        })\n        this.options.onSettled?.(this)\n      }\n    }\n    return item\n  }\n\n  /**\n   * Processes a specified number of items to execute immediately with no wait time\n   * If no numberOfItems is provided, all items will be processed\n   */\n  flush = async (\n    numberOfItems: number = this.store.state.items.length,\n    position?: QueuePosition,\n  ): Promise<void> => {\n    this.#clearTimeouts() // clear any pending timeouts\n    await Promise.all(\n      Array.from({ length: numberOfItems }, () => this.execute(position)),\n    )\n  }\n\n  /**\n   * Processes all items in the queue as a batch using the provided function\n   * The queue is cleared after processing\n   */\n  flushAsBatch = async (\n    batchFunction: (items: Array<TValue>) => Promise<any>,\n  ): Promise<void> => {\n    this.#clearTimeouts() // clear any pending timeouts\n    const items = this.#getAllItems()\n    await batchFunction(items)\n  }\n\n  /**\n   * Checks for expired items in the queue and removes them. Calls onExpire for each expired item.\n   * Internal use only.\n   */\n  #checkExpiredItems = (): void => {\n    if (\n      (this.options.expirationDuration ?? Infinity) === Infinity &&\n      this.options.getIsExpired === defaultOptions.getIsExpired\n    ) {\n      return\n    }\n\n    const now = Date.now()\n    const expiredIndices: Array<number> = []\n\n    // Find indices of expired items\n    for (let i = 0; i < this.store.state.items.length; i++) {\n      const timestamp = this.store.state.itemTimestamps[i]\n      if (timestamp === undefined) continue\n\n      const item = this.store.state.items[i]\n      if (item === undefined) continue\n\n      const isExpired =\n        this.options.getIsExpired !== defaultOptions.getIsExpired\n          ? this.options.getIsExpired!(item, timestamp)\n          : now - timestamp > (this.options.expirationDuration ?? Infinity)\n\n      if (isExpired) {\n        expiredIndices.push(i)\n      }\n    }\n\n    // Remove expired items from back to front to maintain indices\n    for (let i = expiredIndices.length - 1; i >= 0; i--) {\n      const index = expiredIndices[i]\n      if (index === undefined) continue\n\n      const expiredItem = this.store.state.items[index]\n      if (expiredItem === undefined) continue\n\n      const newItems = [...this.store.state.items]\n      const newTimestamps = [...this.store.state.itemTimestamps]\n      newItems.splice(index, 1)\n      newTimestamps.splice(index, 1)\n      this.#setState({\n        items: newItems,\n        itemTimestamps: newTimestamps,\n        expirationCount: this.store.state.expirationCount + 1,\n      })\n      this.options.onExpire?.(expiredItem, this)\n    }\n\n    if (expiredIndices.length > 0) {\n      this.options.onItemsChange?.(this)\n    }\n  }\n\n  /**\n   * Returns the next item in the queue without removing it.\n   *\n   * @example\n   * ```ts\n   * queuer.peekNextItem(); // front\n   * queuer.peekNextItem('back'); // back\n   * ```\n   */\n  peekNextItem = (position: QueuePosition = 'front'): TValue | undefined => {\n    if (position === 'front') {\n      return this.store.state.items[0]\n    }\n    return this.store.state.items[this.store.state.items.length - 1]\n  }\n\n  /**\n   * Returns a copy of all items in the queue, including active and pending items.\n   */\n  peekAllItems = (): Array<TValue> => {\n    return [...this.peekActiveItems(), ...this.peekPendingItems()]\n  }\n\n  /**\n   * Returns the items currently being processed (active tasks).\n   */\n  peekActiveItems = (): Array<TValue> => {\n    return [...this.store.state.activeItems]\n  }\n\n  /**\n   * Returns the items waiting to be processed (pending tasks).\n   */\n  peekPendingItems = (): Array<TValue> => {\n    return [...this.store.state.items]\n  }\n\n  /**\n   * Starts processing items in the queue. If already running, does nothing.\n   */\n  start = (): void => {\n    this.#setState({ isRunning: true })\n    if (!this.store.state.pendingTick && this.store.state.items.length > 0) {\n      this.#tick()\n    }\n  }\n\n  /**\n   * Stops processing items in the queue. Does not clear the queue.\n   */\n  stop = (): void => {\n    this.#clearTimeouts()\n    this.#setState({ isRunning: false, pendingTick: false })\n  }\n\n  #clearTimeouts = (): void => {\n    this.#timeoutIds.forEach((timeoutId) => clearTimeout(timeoutId))\n    this.#timeoutIds.clear()\n  }\n\n  /**\n   * Removes all pending items from the queue. Does not affect active tasks.\n   */\n  clear = (): void => {\n    this.#setState({ items: [], itemTimestamps: [] })\n    this.options.onItemsChange?.(this)\n  }\n\n  /**\n   * Resets the queuer state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultAsyncQueuerState<TValue>())\n    this.options.onItemsChange?.(this)\n  }\n}\n\n/**\n * Creates a new AsyncQueuer instance and returns a bound addItem function for adding tasks.\n * The queuer is started automatically and ready to process items.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and queuer instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together; the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncQueuer instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async queuer\n * - Use `onSuccess` callback to react to successful task execution and implement custom logic\n * - Use `onError` callback to react to task execution errors and implement custom error handling\n * - Use `onSettled` callback to react to task execution completion (success or error) and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the queue\n * - Use `onExpire` callback to react to items expiring and implement custom logic\n * - Use `onReject` callback to react to items being rejected when the queue is full\n * - The state includes error count, expiration count, rejection count, running status, and success/settle counts\n * - State can be accessed via the underlying AsyncQueuer instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * Example usage:\n * ```ts\n * const enqueue = asyncQueue<string>(async (item) => {\n *   return item.toUpperCase();\n * }, {...options});\n *\n * enqueue('hello');\n * ```\n */\nexport function asyncQueue<TValue>(\n  fn: (value: TValue) => Promise<any>,\n  initialOptions: AsyncQueuerOptions<TValue>,\n) {\n  const asyncQueuer = new AsyncQueuer<TValue>(fn, initialOptions)\n  return 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dist/esm/async-rate-limiter.d.ts

@@ -13,2 +13,6 @@ import { Store } from '@tanstack/store';
     /**
+     * Whether the rate limiter has exceeded the limit
+     */
+    isExceeded: boolean;
+    /**
      * Whether the rate-limited function is currently executing asynchronously
@@ -30,2 +34,6 @@ */
     /**
+     * Current execution status - 'disabled' when not active, 'executing' when executing, 'idle' when not executing, 'exceeded' when rate limit is exceeded
+     */
+    status: 'disabled' | 'executing' | 'exceeded' | 'idle';
+    /**
      * Number of function executions that have completed successfully
@@ -32,0 +40,0 @@ */

dist/esm/async-rate-limiter.js

@@ -7,2 +7,3 @@ import { Store } from "@tanstack/store";
     executionTimes: [],
+    isExceeded: false,
     isExecuting: false,
@@ -12,3 +13,4 @@ lastResult: void 0,
     settleCount: 0,
-    successCount: 0
+    successCount: 0,
+    status: "idle"
   };
@@ -27,2 +29,3 @@ }
     this.store = new Store(getDefaultAsyncRateLimiterState());
+    this.#timeoutIds = /* @__PURE__ */ new Set();
     this.setOptions = (newOptions) => {
@@ -37,3 +40,9 @@ this.options = { ...this.options, ...newOptions };
         };
-        return combinedState;
+        const isExceeded = combinedState.executionTimes.length >= this.#getLimit();
+        const status = !this.#getEnabled() ? "disabled" : combinedState.isExecuting ? "executing" : isExceeded ? "exceeded" : "idle";
+        return {
+          ...combinedState,
+          isExceeded,
+          status
+        };
       });
@@ -52,3 +61,3 @@ };
       this.#cleanupOldExecutions();
-      const relevantExecutionTimes = this.#getRelevantExecutionTimes();
+      const relevantExecutionTimes = this.#getExecutionTimesInWindow();
       if (relevantExecutionTimes.length < this.#getLimit()) {
@@ -74,2 +83,3 @@ await this.#execute(...args);
         const result = await this.fn(...args);
+        this.#setCleanupTimeout(now);
         this.#setState({
@@ -97,3 +107,3 @@ successCount: this.store.state.successCount + 1,
     };
-    this.#getRelevantExecutionTimes = () => {
+    this.#getExecutionTimesInWindow = () => {
       if (this.options.windowType === "sliding") {
@@ -104,20 +114,43 @@ return this.store.state.executionTimes.filter(
       } else {
+        if (this.store.state.executionTimes.length === 0) {
+          return [];
+        }
         const oldestExecution = Math.min(...this.store.state.executionTimes);
         const windowStart = oldestExecution;
+        const windowEnd = windowStart + this.#getWindow();
+        const now = Date.now();
+        if (now > windowEnd) {
+          return [];
+        }
         return this.store.state.executionTimes.filter(
-          (time) => time >= windowStart && time <= windowStart + this.#getWindow()
+          (time) => time >= windowStart && time <= windowEnd
         );
       }
     };
+    this.#setCleanupTimeout = (executionTime) => {
+      if (this.options.windowType === "sliding" || this.#timeoutIds.size === 0) {
+        const now = Date.now();
+        const timeUntilExpiration = executionTime - now + this.#getWindow() + 1;
+        const timeoutId = setTimeout(() => {
+          this.#cleanupOldExecutions();
+          this.#clearTimeout(timeoutId);
+        }, timeUntilExpiration);
+        this.#timeoutIds.add(timeoutId);
+      }
+    };
+    this.#clearTimeout = (timeoutId) => {
+      clearTimeout(timeoutId);
+      this.#timeoutIds.delete(timeoutId);
+    };
+    this.#clearTimeouts = () => {
+      this.#timeoutIds.forEach((timeoutId) => clearTimeout(timeoutId));
+      this.#timeoutIds.clear();
+    };
     this.#cleanupOldExecutions = () => {
-      const now = Date.now();
-      const windowStart = now - this.#getWindow();
       this.#setState({
-        executionTimes: this.store.state.executionTimes.filter(
-          (time) => time > windowStart
-        )
+        executionTimes: this.#getExecutionTimesInWindow()
       });
     };
     this.getRemainingInWindow = () => {
-      const relevantExecutionTimes = this.#getRelevantExecutionTimes();
+      const relevantExecutionTimes = this.#getExecutionTimesInWindow();
       return Math.max(0, this.#getLimit() - relevantExecutionTimes.length);
@@ -134,2 +167,3 @@ };
       this.#setState(getDefaultAsyncRateLimiterState());
+      this.#clearTimeouts();
     };
@@ -142,3 +176,7 @@ this.options = {
     this.#setState(this.options.initialState ?? {});
+    for (const executionTime of this.#getExecutionTimesInWindow()) {
+      this.#setCleanupTimeout(executionTime);
+    }
   }
+  #timeoutIds;
   #setState;
@@ -149,3 +187,6 @@ #getEnabled;
   #execute;
-  #getRelevantExecutionTimes;
+  #getExecutionTimesInWindow;
+  #setCleanupTimeout;
+  #clearTimeout;
+  #clearTimeouts;
   #cleanupOldExecutions;
@@ -152,0 +193,0 @@ }

dist/esm/async-rate-limiter.js.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"async-rate-limiter.js","sources":["../../src/async-rate-limiter.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { AnyAsyncFunction } from './types'\n\nexport interface AsyncRateLimiterState<TFn extends AnyAsyncFunction> {\n  /**\n   * Number of function executions that have resulted in errors\n   */\n  errorCount: number\n  /**\n   * Array of timestamps when executions occurred for rate limiting calculations\n   */\n  executionTimes: Array<number>\n  /**\n   * Whether the rate-limited function is currently executing asynchronously\n   */\n  isExecuting: boolean\n  /**\n   * The result from the most recent successful function execution\n   */\n  lastResult: ReturnType<TFn> | undefined\n  /**\n   * Number of function executions that have been rejected due to rate limiting\n   */\n  rejectionCount: number\n  /**\n   * Number of function executions that have completed (either successfully or with errors)\n   */\n  settleCount: number\n  /**\n   * Number of function executions that have completed successfully\n   */\n  successCount: number\n}\n\nfunction getDefaultAsyncRateLimiterState<\n  TFn extends AnyAsyncFunction,\n>(): AsyncRateLimiterState<TFn> {\n  return {\n    errorCount: 0,\n    executionTimes: [],\n    isExecuting: false,\n    lastResult: undefined,\n    rejectionCount: 0,\n    settleCount: 0,\n    successCount: 0,\n  }\n}\n\n/**\n * Options for configuring an async rate-limited function\n */\nexport interface AsyncRateLimiterOptions<TFn extends AnyAsyncFunction> {\n  /**\n   * Whether the rate limiter is enabled. When disabled, maybeExecute will not trigger any executions.\n   * Can be a boolean or a function that returns a boolean.\n   * Defaults to true.\n   */\n  enabled?: boolean | ((rateLimiter: AsyncRateLimiter<TFn>) => boolean)\n  /**\n   * Initial state for the rate limiter\n   */\n  initialState?: Partial<AsyncRateLimiterState<TFn>>\n  /**\n   * Maximum number of executions allowed within the time window.\n   * Can be a number or a function that returns a number.\n   */\n  limit: number | ((rateLimiter: AsyncRateLimiter<TFn>) => number)\n  /**\n   * Optional error handler for when the rate-limited function throws.\n   * If provided, the handler will be called with the error and rate limiter instance.\n   * This can be used alongside throwOnError - the handler will be called before any error is thrown.\n   */\n  onError?: (error: unknown, rateLimiter: AsyncRateLimiter<TFn>) => void\n  /**\n   * Optional callback function that is called when an execution is rejected due to rate limiting\n   */\n  onReject?: (rateLimiter: AsyncRateLimiter<TFn>) => void\n  /**\n   * Optional function to call when the rate-limited function is executed\n   */\n  onSettled?: (rateLimiter: AsyncRateLimiter<TFn>) => void\n  /**\n   * Optional function to call when the rate-limited function is executed\n   */\n  onSuccess?: (\n    result: ReturnType<TFn>,\n    rateLimiter: AsyncRateLimiter<TFn>,\n  ) => void\n  /**\n   * Whether to throw errors when they occur.\n   * Defaults to true if no onError handler is provided, false if an onError handler is provided.\n   * Can be explicitly set to override these defaults.\n   */\n  throwOnError?: boolean\n  /**\n   * Time window in milliseconds within which the limit applies.\n   * Can be a number or a function that returns a number.\n   */\n  window: number | ((rateLimiter: AsyncRateLimiter<TFn>) => number)\n  /**\n   * Type of window to use for rate limiting\n   * - 'fixed': Uses a fixed window that resets after the window period\n   * - 'sliding': Uses a sliding window that allows executions as old ones expire\n   * Defaults to 'fixed'\n   */\n  windowType?: 'fixed' | 'sliding'\n}\n\nconst defaultOptions: Omit<\n  Required<AsyncRateLimiterOptions<any>>,\n  'initialState' | 'onError' | 'onReject' | 'onSettled' | 'onSuccess'\n> = {\n  enabled: true,\n  limit: 1,\n  window: 0,\n  windowType: 'fixed',\n  throwOnError: true,\n}\n\n/**\n * A class that creates an async rate-limited function.\n *\n * Rate limiting is a simple approach that allows a function to execute up to a limit within a time window,\n * then blocks all subsequent calls until the window passes. This can lead to \"bursty\" behavior where\n * all executions happen immediately, followed by a complete block.\n *\n * The rate limiter supports two types of windows:\n * - 'fixed': A strict window that resets after the window period. All executions within the window count\n *   towards the limit, and the window resets completely after the period.\n * - 'sliding': A rolling window that allows executions as old ones expire. This provides a more\n *   consistent rate of execution over time.\n *\n * Unlike the non-async RateLimiter, this async version supports returning values from the rate-limited function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the rate-limited function.\n *\n * For smoother execution patterns, consider using:\n * - Throttling: Ensures consistent spacing between executions (e.g. max once per 200ms)\n * - Debouncing: Waits for a pause in calls before executing (e.g. after 500ms of no calls)\n *\n * Rate limiting is best used for hard API limits or resource constraints. For UI updates or\n * smoothing out frequent events, throttling or debouncing usually provide better user experience.\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the rate limiter\n * - `initialState` can be a partial state object\n * - Use `onSuccess` callback to react to successful function execution and implement custom logic\n * - Use `onError` callback to react to function execution errors and implement custom error handling\n * - Use `onSettled` callback to react to function execution completion (success or error) and implement custom logic\n * - Use `onReject` callback to react to executions being rejected when rate limit is exceeded\n * - The state includes execution times, success/error counts, and current execution status\n * - State can be accessed via `asyncRateLimiter.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `asyncRateLimiter.state`\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and rate limiter instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncRateLimiter instance\n * - Rate limit rejections (when limit is exceeded) are handled separately from execution errors via the `onReject` handler\n *\n * @example\n * ```ts\n * const rateLimiter = new AsyncRateLimiter(\n *   async (id: string) => await api.getData(id),\n *   {\n *     limit: 5,\n *     window: 1000,\n *     windowType: 'sliding',\n *     onError: (error) => {\n *       console.error('API call failed:', error);\n *     },\n *     onReject: (limiter) => {\n *       console.log(`Rate limit exceeded. Try again in ${limiter.getMsUntilNextWindow()}ms`);\n *     }\n *   }\n * );\n *\n * // Will execute immediately until limit reached, then block\n * // Returns the API response directly\n * const data = await rateLimiter.maybeExecute('123');\n * ```\n */\nexport class AsyncRateLimiter<TFn extends AnyAsyncFunction> {\n  readonly store: Store<Readonly<AsyncRateLimiterState<TFn>>> = new Store<\n    AsyncRateLimiterState<TFn>\n  >(getDefaultAsyncRateLimiterState<TFn>())\n  options: AsyncRateLimiterOptions<TFn>\n\n  constructor(\n    private fn: TFn,\n    initialOptions: AsyncRateLimiterOptions<TFn>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n      throwOnError: initialOptions.throwOnError ?? !initialOptions.onError,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the async rate limiter options\n   */\n  setOptions = (newOptions: Partial<AsyncRateLimiterOptions<TFn>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<AsyncRateLimiterState<TFn>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      return combinedState\n    })\n  }\n\n  /**\n   * Returns the current enabled state of the async rate limiter\n   */\n  #getEnabled = (): boolean => {\n    return !!parseFunctionOrValue(this.options.enabled, this)\n  }\n\n  /**\n   * Returns the current limit of executions allowed within the time window\n   */\n  #getLimit = (): number => {\n    return parseFunctionOrValue(this.options.limit, this)\n  }\n\n  /**\n   * Returns the current time window in milliseconds\n   */\n  #getWindow = (): number => {\n    return parseFunctionOrValue(this.options.window, this)\n  }\n\n  /**\n   * Attempts to execute the rate-limited function if within the configured limits.\n   * Will reject execution if the number of calls in the current window exceeds the limit.\n   *\n   * Error Handling:\n   * - If the rate-limited function throws and no `onError` handler is configured,\n   *   the error will be thrown from this method.\n   * - If an `onError` handler is configured, errors will be caught and passed to the handler,\n   *   and this method will return undefined.\n   * - The error state can be checked using `getErrorCount()` and `getIsExecuting()`.\n   *\n   * @returns A promise that resolves with the function's return value, or undefined if an error occurred and was handled by onError\n   * @throws The error from the rate-limited function if no onError handler is configured\n   *\n   * @example\n   * ```ts\n   * const rateLimiter = new AsyncRateLimiter(fn, { limit: 5, window: 1000 });\n   *\n   * // First 5 calls will return a promise that resolves with the result\n   * const result = await rateLimiter.maybeExecute('arg1', 'arg2');\n   *\n   * // Additional calls within the window will return undefined\n   * const result2 = await rateLimiter.maybeExecute('arg1', 'arg2'); // undefined\n   * ```\n   */\n  maybeExecute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    this.#cleanupOldExecutions()\n\n    const relevantExecutionTimes = this.#getRelevantExecutionTimes()\n\n    if (relevantExecutionTimes.length < this.#getLimit()) {\n      await this.#execute(...args)\n      return this.store.state.lastResult\n    }\n\n    this.#setState({\n      rejectionCount: this.store.state.rejectionCount + 1,\n    })\n    this.options.onReject?.(this)\n    return undefined\n  }\n\n  #execute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    if (!this.#getEnabled()) return\n\n    const now = Date.now()\n    const executionTimes = [...this.store.state.executionTimes, now]\n    this.#setState({\n      isExecuting: true,\n      executionTimes,\n    })\n\n    try {\n      const result = await this.fn(...args)\n      this.#setState({\n        successCount: this.store.state.successCount + 1,\n        lastResult: result,\n      })\n      this.options.onSuccess?.(result, this)\n    } catch (error) {\n      this.#setState({\n        errorCount: this.store.state.errorCount + 1,\n      })\n      this.options.onError?.(error, this)\n      if (this.options.throwOnError) {\n        throw error\n      }\n    } finally {\n      this.#setState({\n        isExecuting: false,\n        settleCount: this.store.state.settleCount + 1,\n      })\n      this.options.onSettled?.(this)\n    }\n\n    return this.store.state.lastResult\n  }\n\n  #getRelevantExecutionTimes = (): Array<number> => {\n    if (this.options.windowType === 'sliding') {\n      // For sliding window, return all executions within the current window\n      return this.store.state.executionTimes.filter(\n        (time) => time > Date.now() - this.#getWindow(),\n      )\n    } else {\n      // For fixed window, return all executions in the current window\n      // The window starts from the oldest execution time\n      const oldestExecution = Math.min(...this.store.state.executionTimes)\n      const windowStart = oldestExecution\n      return this.store.state.executionTimes.filter(\n        (time) =>\n          time >= windowStart && time <= windowStart + this.#getWindow(),\n      )\n    }\n  }\n\n  #cleanupOldExecutions = (): void => {\n    const now = Date.now()\n    const windowStart = now - this.#getWindow()\n    this.#setState({\n      executionTimes: this.store.state.executionTimes.filter(\n        (time) => time > windowStart,\n      ),\n    })\n  }\n\n  /**\n   * Returns the number of remaining executions allowed in the current window\n   */\n  getRemainingInWindow = (): number => {\n    const relevantExecutionTimes = this.#getRelevantExecutionTimes()\n    return Math.max(0, this.#getLimit() - relevantExecutionTimes.length)\n  }\n\n  /**\n   * Returns the number of milliseconds until the next execution will be possible\n   * For fixed windows, this is the time until the current window resets\n   * For sliding windows, this is the time until the oldest execution expires\n   */\n  getMsUntilNextWindow = (): number => {\n    if (this.getRemainingInWindow() > 0) {\n      return 0\n    }\n    const oldestExecution = this.store.state.executionTimes[0] ?? Infinity\n    return oldestExecution + this.#getWindow() - Date.now()\n  }\n\n  /**\n   * Resets the rate limiter state\n   */\n  reset = (): void => {\n    this.#setState(getDefaultAsyncRateLimiterState())\n  }\n}\n\n/**\n * Creates an async rate-limited function that will execute the provided function up to a maximum number of times within a time window.\n *\n * Unlike the non-async rate limiter, this async version supports returning values from the rate-limited function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the rate-limited function.\n *\n * The rate limiter supports two types of windows:\n * - 'fixed': A strict window that resets after the window period. All executions within the window count\n *   towards the limit, and the window resets completely after the period.\n * - 'sliding': A rolling window that allows executions as old ones expire. This provides a more\n *   consistent rate of execution over time.\n *\n * Note that rate limiting is a simpler form of execution control compared to throttling or debouncing:\n * - A rate limiter will allow all executions until the limit is reached, then block all subsequent calls until the window resets\n * - A throttler ensures even spacing between executions, which can be better for consistent performance\n * - A debouncer collapses multiple calls into one, which is better for handling bursts of events\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the rate limiter\n * - `initialState` can be a partial state object\n * - Use `onSuccess` callback to react to successful function execution and implement custom logic\n * - Use `onError` callback to react to function execution errors and implement custom error handling\n * - Use `onSettled` callback to react to function execution completion (success or error) and implement custom logic\n * - Use `onReject` callback to react to executions being rejected when rate limit is exceeded\n * - The state includes execution times, success/error counts, and current execution status\n * - State can be accessed via the underlying AsyncRateLimiter instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * Consider using throttle() or debounce() if you need more intelligent execution control. Use rate limiting when you specifically\n * need to enforce a hard limit on the number of executions within a time period.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and rate limiter instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncRateLimiter instance\n * - Rate limit rejections (when limit is exceeded) are handled separately from execution errors via the `onReject` handler\n *\n * @example\n * ```ts\n * // Rate limit to 5 calls per minute with a sliding window\n * const rateLimited = asyncRateLimit(makeApiCall, {\n *   limit: 5,\n *   window: 60000,\n *   windowType: 'sliding',\n *   onError: (error) => {\n *     console.error('API call failed:', error);\n *   },\n *   onReject: (rateLimiter) => {\n *     console.log(`Rate limit exceeded. 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+{"version":3,"file":"async-rate-limiter.js","sources":["../../src/async-rate-limiter.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { AnyAsyncFunction } from './types'\n\nexport interface AsyncRateLimiterState<TFn extends AnyAsyncFunction> {\n  /**\n   * Number of function executions that have resulted in errors\n   */\n  errorCount: number\n  /**\n   * Array of timestamps when executions occurred for rate limiting calculations\n   */\n  executionTimes: Array<number>\n  /**\n   * Whether the rate limiter has exceeded the limit\n   */\n  isExceeded: boolean\n  /**\n   * Whether the rate-limited function is currently executing asynchronously\n   */\n  isExecuting: boolean\n  /**\n   * The result from the most recent successful function execution\n   */\n  lastResult: ReturnType<TFn> | undefined\n  /**\n   * Number of function executions that have been rejected due to rate limiting\n   */\n  rejectionCount: number\n  /**\n   * Number of function executions that have completed (either successfully or with errors)\n   */\n  settleCount: number\n  /**\n   * Current execution status - 'disabled' when not active, 'executing' when executing, 'idle' when not executing, 'exceeded' when rate limit is exceeded\n   */\n  status: 'disabled' | 'executing' | 'exceeded' | 'idle'\n  /**\n   * Number of function executions that have completed successfully\n   */\n  successCount: number\n}\n\nfunction getDefaultAsyncRateLimiterState<\n  TFn extends AnyAsyncFunction,\n>(): AsyncRateLimiterState<TFn> {\n  return {\n    errorCount: 0,\n    executionTimes: [],\n    isExceeded: false,\n    isExecuting: false,\n    lastResult: undefined,\n    rejectionCount: 0,\n    settleCount: 0,\n    successCount: 0,\n    status: 'idle',\n  }\n}\n\n/**\n * Options for configuring an async rate-limited function\n */\nexport interface AsyncRateLimiterOptions<TFn extends AnyAsyncFunction> {\n  /**\n   * Whether the rate limiter is enabled. When disabled, maybeExecute will not trigger any executions.\n   * Can be a boolean or a function that returns a boolean.\n   * Defaults to true.\n   */\n  enabled?: boolean | ((rateLimiter: AsyncRateLimiter<TFn>) => boolean)\n  /**\n   * Initial state for the rate limiter\n   */\n  initialState?: Partial<AsyncRateLimiterState<TFn>>\n  /**\n   * Maximum number of executions allowed within the time window.\n   * Can be a number or a function that returns a number.\n   */\n  limit: number | ((rateLimiter: AsyncRateLimiter<TFn>) => number)\n  /**\n   * Optional error handler for when the rate-limited function throws.\n   * If provided, the handler will be called with the error and rate limiter instance.\n   * This can be used alongside throwOnError - the handler will be called before any error is thrown.\n   */\n  onError?: (error: unknown, rateLimiter: AsyncRateLimiter<TFn>) => void\n  /**\n   * Optional callback function that is called when an execution is rejected due to rate limiting\n   */\n  onReject?: (rateLimiter: AsyncRateLimiter<TFn>) => void\n  /**\n   * Optional function to call when the rate-limited function is executed\n   */\n  onSettled?: (rateLimiter: AsyncRateLimiter<TFn>) => void\n  /**\n   * Optional function to call when the rate-limited function is executed\n   */\n  onSuccess?: (\n    result: ReturnType<TFn>,\n    rateLimiter: AsyncRateLimiter<TFn>,\n  ) => void\n  /**\n   * Whether to throw errors when they occur.\n   * Defaults to true if no onError handler is provided, false if an onError handler is provided.\n   * Can be explicitly set to override these defaults.\n   */\n  throwOnError?: boolean\n  /**\n   * Time window in milliseconds within which the limit applies.\n   * Can be a number or a function that returns a number.\n   */\n  window: number | ((rateLimiter: AsyncRateLimiter<TFn>) => number)\n  /**\n   * Type of window to use for rate limiting\n   * - 'fixed': Uses a fixed window that resets after the window period\n   * - 'sliding': Uses a sliding window that allows executions as old ones expire\n   * Defaults to 'fixed'\n   */\n  windowType?: 'fixed' | 'sliding'\n}\n\nconst defaultOptions: Omit<\n  Required<AsyncRateLimiterOptions<any>>,\n  'initialState' | 'onError' | 'onReject' | 'onSettled' | 'onSuccess'\n> = {\n  enabled: true,\n  limit: 1,\n  window: 0,\n  windowType: 'fixed',\n  throwOnError: true,\n}\n\n/**\n * A class that creates an async rate-limited function.\n *\n * Rate limiting is a simple approach that allows a function to execute up to a limit within a time window,\n * then blocks all subsequent calls until the window passes. This can lead to \"bursty\" behavior where\n * all executions happen immediately, followed by a complete block.\n *\n * The rate limiter supports two types of windows:\n * - 'fixed': A strict window that resets after the window period. All executions within the window count\n *   towards the limit, and the window resets completely after the period.\n * - 'sliding': A rolling window that allows executions as old ones expire. This provides a more\n *   consistent rate of execution over time.\n *\n * Unlike the non-async RateLimiter, this async version supports returning values from the rate-limited function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the rate-limited function.\n *\n * For smoother execution patterns, consider using:\n * - Throttling: Ensures consistent spacing between executions (e.g. max once per 200ms)\n * - Debouncing: Waits for a pause in calls before executing (e.g. after 500ms of no calls)\n *\n * Rate limiting is best used for hard API limits or resource constraints. For UI updates or\n * smoothing out frequent events, throttling or debouncing usually provide better user experience.\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the rate limiter\n * - `initialState` can be a partial state object\n * - Use `onSuccess` callback to react to successful function execution and implement custom logic\n * - Use `onError` callback to react to function execution errors and implement custom error handling\n * - Use `onSettled` callback to react to function execution completion (success or error) and implement custom logic\n * - Use `onReject` callback to react to executions being rejected when rate limit is exceeded\n * - The state includes execution times, success/error counts, and current execution status\n * - State can be accessed via `asyncRateLimiter.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `asyncRateLimiter.state`\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and rate limiter instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncRateLimiter instance\n * - Rate limit rejections (when limit is exceeded) are handled separately from execution errors via the `onReject` handler\n *\n * @example\n * ```ts\n * const rateLimiter = new AsyncRateLimiter(\n *   async (id: string) => await api.getData(id),\n *   {\n *     limit: 5,\n *     window: 1000,\n *     windowType: 'sliding',\n *     onError: (error) => {\n *       console.error('API call failed:', error);\n *     },\n *     onReject: (limiter) => {\n *       console.log(`Rate limit exceeded. Try again in ${limiter.getMsUntilNextWindow()}ms`);\n *     }\n *   }\n * );\n *\n * // Will execute immediately until limit reached, then block\n * // Returns the API response directly\n * const data = await rateLimiter.maybeExecute('123');\n * ```\n */\nexport class AsyncRateLimiter<TFn extends AnyAsyncFunction> {\n  readonly store: Store<Readonly<AsyncRateLimiterState<TFn>>> = new Store<\n    AsyncRateLimiterState<TFn>\n  >(getDefaultAsyncRateLimiterState<TFn>())\n  options: AsyncRateLimiterOptions<TFn>\n  #timeoutIds: Set<NodeJS.Timeout> = new Set()\n\n  constructor(\n    private fn: TFn,\n    initialOptions: AsyncRateLimiterOptions<TFn>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n      throwOnError: initialOptions.throwOnError ?? !initialOptions.onError,\n    }\n    this.#setState(this.options.initialState ?? {})\n    for (const executionTime of this.#getExecutionTimesInWindow()) {\n      this.#setCleanupTimeout(executionTime)\n    }\n  }\n\n  /**\n   * Updates the async rate limiter options\n   */\n  setOptions = (newOptions: Partial<AsyncRateLimiterOptions<TFn>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<AsyncRateLimiterState<TFn>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const isExceeded = combinedState.executionTimes.length >= this.#getLimit()\n      const status = !this.#getEnabled()\n        ? 'disabled'\n        : combinedState.isExecuting\n          ? 'executing'\n          : isExceeded\n            ? 'exceeded'\n            : 'idle'\n      return {\n        ...combinedState,\n        isExceeded,\n        status,\n      }\n    })\n  }\n\n  /**\n   * Returns the current enabled state of the async rate limiter\n   */\n  #getEnabled = (): boolean => {\n    return !!parseFunctionOrValue(this.options.enabled, this)\n  }\n\n  /**\n   * Returns the current limit of executions allowed within the time window\n   */\n  #getLimit = (): number => {\n    return parseFunctionOrValue(this.options.limit, this)\n  }\n\n  /**\n   * Returns the current time window in milliseconds\n   */\n  #getWindow = (): number => {\n    return parseFunctionOrValue(this.options.window, this)\n  }\n\n  /**\n   * Attempts to execute the rate-limited function if within the configured limits.\n   * Will reject execution if the number of calls in the current window exceeds the limit.\n   *\n   * Error Handling:\n   * - If the rate-limited function throws and no `onError` handler is configured,\n   *   the error will be thrown from this method.\n   * - If an `onError` handler is configured, errors will be caught and passed to the handler,\n   *   and this method will return undefined.\n   * - The error state can be checked using `getErrorCount()` and `getIsExecuting()`.\n   *\n   * @returns A promise that resolves with the function's return value, or undefined if an error occurred and was handled by onError\n   * @throws The error from the rate-limited function if no onError handler is configured\n   *\n   * @example\n   * ```ts\n   * const rateLimiter = new AsyncRateLimiter(fn, { limit: 5, window: 1000 });\n   *\n   * // First 5 calls will return a promise that resolves with the result\n   * const result = await rateLimiter.maybeExecute('arg1', 'arg2');\n   *\n   * // Additional calls within the window will return undefined\n   * const result2 = await rateLimiter.maybeExecute('arg1', 'arg2'); // undefined\n   * ```\n   */\n  maybeExecute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    this.#cleanupOldExecutions()\n\n    const relevantExecutionTimes = this.#getExecutionTimesInWindow()\n\n    if (relevantExecutionTimes.length < this.#getLimit()) {\n      await this.#execute(...args)\n      return this.store.state.lastResult\n    }\n\n    this.#setState({\n      rejectionCount: this.store.state.rejectionCount + 1,\n    })\n    this.options.onReject?.(this)\n    return undefined\n  }\n\n  #execute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    if (!this.#getEnabled()) return\n\n    const now = Date.now()\n    const executionTimes = [...this.store.state.executionTimes, now]\n    this.#setState({\n      isExecuting: true,\n      executionTimes,\n    })\n\n    try {\n      const result = await this.fn(...args) // EXECUTE!\n      this.#setCleanupTimeout(now)\n      this.#setState({\n        successCount: this.store.state.successCount + 1,\n        lastResult: result,\n      })\n      this.options.onSuccess?.(result, this)\n    } catch (error) {\n      this.#setState({\n        errorCount: this.store.state.errorCount + 1,\n      })\n      this.options.onError?.(error, this)\n      if (this.options.throwOnError) {\n        throw error\n      }\n    } finally {\n      this.#setState({\n        isExecuting: false,\n        settleCount: this.store.state.settleCount + 1,\n      })\n      this.options.onSettled?.(this)\n    }\n\n    return this.store.state.lastResult\n  }\n\n  #getExecutionTimesInWindow = (): Array<number> => {\n    if (this.options.windowType === 'sliding') {\n      // For sliding window, return all executions within the current window\n      return this.store.state.executionTimes.filter(\n        (time) => time > Date.now() - this.#getWindow(),\n      )\n    } else {\n      // For fixed window, return all executions in the current window\n      // The window starts from the oldest execution time\n      if (this.store.state.executionTimes.length === 0) {\n        return []\n      }\n      const oldestExecution = Math.min(...this.store.state.executionTimes)\n      const windowStart = oldestExecution\n      const windowEnd = windowStart + this.#getWindow()\n      const now = Date.now()\n\n      // If the window has expired, return empty array\n      if (now > windowEnd) {\n        return []\n      }\n\n      // Otherwise, return all executions in the current window\n      return this.store.state.executionTimes.filter(\n        (time) => time >= windowStart && time <= windowEnd,\n      )\n    }\n  }\n\n  #setCleanupTimeout = (executionTime: number): void => {\n    if (\n      this.options.windowType === 'sliding' ||\n      this.#timeoutIds.size === 0 // new fixed window\n    ) {\n      const now = Date.now()\n      const timeUntilExpiration = executionTime - now + this.#getWindow() + 1\n      const timeoutId = setTimeout(() => {\n        this.#cleanupOldExecutions()\n        this.#clearTimeout(timeoutId)\n      }, timeUntilExpiration)\n      this.#timeoutIds.add(timeoutId)\n    }\n  }\n\n  #clearTimeout = (timeoutId: NodeJS.Timeout): void => {\n    clearTimeout(timeoutId)\n    this.#timeoutIds.delete(timeoutId)\n  }\n\n  #clearTimeouts = (): void => {\n    this.#timeoutIds.forEach((timeoutId) => clearTimeout(timeoutId))\n    this.#timeoutIds.clear()\n  }\n\n  #cleanupOldExecutions = (): void => {\n    this.#setState({\n      executionTimes: this.#getExecutionTimesInWindow(),\n    })\n  }\n\n  /**\n   * Returns the number of remaining executions allowed in the current window\n   */\n  getRemainingInWindow = (): number => {\n    const relevantExecutionTimes = this.#getExecutionTimesInWindow()\n    return Math.max(0, this.#getLimit() - relevantExecutionTimes.length)\n  }\n\n  /**\n   * Returns the number of milliseconds until the next execution will be possible\n   * For fixed windows, this is the time until the current window resets\n   * For sliding windows, this is the time until the oldest execution expires\n   */\n  getMsUntilNextWindow = (): number => {\n    if (this.getRemainingInWindow() > 0) {\n      return 0\n    }\n    const oldestExecution = this.store.state.executionTimes[0] ?? Infinity\n    return oldestExecution + this.#getWindow() - Date.now()\n  }\n\n  /**\n   * Resets the rate limiter state\n   */\n  reset = (): void => {\n    this.#setState(getDefaultAsyncRateLimiterState())\n    this.#clearTimeouts()\n  }\n}\n\n/**\n * Creates an async rate-limited function that will execute the provided function up to a maximum number of times within a time window.\n *\n * Unlike the non-async rate limiter, this async version supports returning values from the rate-limited function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the rate-limited function.\n *\n * The rate limiter supports two types of windows:\n * - 'fixed': A strict window that resets after the window period. All executions within the window count\n *   towards the limit, and the window resets completely after the period.\n * - 'sliding': A rolling window that allows executions as old ones expire. This provides a more\n *   consistent rate of execution over time.\n *\n * Note that rate limiting is a simpler form of execution control compared to throttling or debouncing:\n * - A rate limiter will allow all executions until the limit is reached, then block all subsequent calls until the window resets\n * - A throttler ensures even spacing between executions, which can be better for consistent performance\n * - A debouncer collapses multiple calls into one, which is better for handling bursts of events\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the rate limiter\n * - `initialState` can be a partial state object\n * - Use `onSuccess` callback to react to successful function execution and implement custom logic\n * - Use `onError` callback to react to function execution errors and implement custom error handling\n * - Use `onSettled` callback to react to function execution completion (success or error) and implement custom logic\n * - Use `onReject` callback to react to executions being rejected when rate limit is exceeded\n * - The state includes execution times, success/error counts, and current execution status\n * - State can be accessed via the underlying AsyncRateLimiter instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * Consider using throttle() or debounce() if you need more intelligent execution control. Use rate limiting when you specifically\n * need to enforce a hard limit on the number of executions within a time period.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and rate limiter instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncRateLimiter instance\n * - Rate limit rejections (when limit is exceeded) are handled separately from execution errors via the `onReject` handler\n *\n * @example\n * ```ts\n * // Rate limit to 5 calls per minute with a sliding window\n * const rateLimited = asyncRateLimit(makeApiCall, {\n *   limit: 5,\n *   window: 60000,\n *   windowType: 'sliding',\n *   onError: (error) => {\n *     console.error('API call failed:', error);\n *   },\n *   onReject: (rateLimiter) => {\n *     console.log(`Rate limit exceeded. 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dist/esm/async-throttler.d.ts

@@ -180,3 +180,3 @@ import { Store } from '@tanstack/store';
      */
-    flush: () => void;
+    flush: () => Promise<ReturnType<TFn> | undefined>;
     /**
@@ -183,0 +183,0 @@ * Cancels any pending execution or aborts any execution in progress

dist/esm/async-throttler.js

@@ -30,2 +30,3 @@ import { Store } from "@tanstack/store";
     this.#resolvePreviousPromise = null;
+    this.#rejectPreviousPromise = null;
     this.setOptions = (newOptions) => {
@@ -67,4 +68,5 @@ this.options = { ...this.options, ...newOptions };
       } else {
-        return new Promise((resolve) => {
+        return new Promise((resolve, reject) => {
           this.#resolvePreviousPromise = resolve;
+          this.#rejectPreviousPromise = reject;
           this.#clearTimeout();
@@ -103,5 +105,3 @@ if (this.options.trailing) {
         if (this.options.throwOnError) {
-          throw error;
-        } else {
-          console.error(error);
+          this.#rejectPreviousPromiseInternal(error);
         }
@@ -123,8 +123,11 @@ } finally {
     };
-    this.flush = () => {
+    this.flush = async () => {
       if (this.store.state.isPending && this.store.state.lastArgs) {
         this.#abortExecution();
         this.#clearTimeout();
-        this.#execute(...this.store.state.lastArgs);
+        const result = await this.#execute(...this.store.state.lastArgs);
+        this.#resolvePreviousPromiseInternal();
+        return result;
       }
+      return void 0;
     };
@@ -137,2 +140,8 @@ this.#resolvePreviousPromiseInternal = () => {
     };
+    this.#rejectPreviousPromiseInternal = (error) => {
+      if (this.#rejectPreviousPromise) {
+        this.#rejectPreviousPromise(error);
+        this.#rejectPreviousPromise = null;
+      }
+    };
     this.#clearTimeout = () => {
@@ -179,2 +188,3 @@ if (this.#timeoutId) {
   #resolvePreviousPromise;
+  #rejectPreviousPromise;
   #setState;
@@ -185,2 +195,3 @@ #getEnabled;
   #resolvePreviousPromiseInternal;
+  #rejectPreviousPromiseInternal;
   #clearTimeout;
@@ -187,0 +198,0 @@ #cancelPendingExecution;

dist/esm/async-throttler.js.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"async-throttler.js","sources":["../../src/async-throttler.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { AnyAsyncFunction, OptionalKeys } from './types'\n\nexport interface AsyncThrottlerState<TFn extends AnyAsyncFunction> {\n  /**\n   * Number of function executions that have resulted in errors\n   */\n  errorCount: number\n  /**\n   * Whether the throttled function is currently executing asynchronously\n   */\n  isExecuting: boolean\n  /**\n   * Whether the throttler is waiting for the timeout to trigger execution\n   */\n  isPending: boolean\n  /**\n   * The arguments from the most recent call to maybeExecute\n   */\n  lastArgs: Parameters<TFn> | undefined\n  /**\n   * Timestamp of the last function execution in milliseconds\n   */\n  lastExecutionTime: number\n  /**\n   * The result from the most recent successful function execution\n   */\n  lastResult: ReturnType<TFn> | undefined\n  /**\n   * Timestamp when the next execution can occur in milliseconds\n   */\n  nextExecutionTime: number\n  /**\n   * Number of function executions that have completed (either successfully or with errors)\n   */\n  settleCount: number\n  /**\n   * Current execution status - 'idle' when not active, 'pending' when waiting, 'executing' when running, 'settled' when completed\n   */\n  status: 'disabled' | 'idle' | 'pending' | 'executing' | 'settled'\n  /**\n   * Number of function executions that have completed successfully\n   */\n  successCount: number\n}\n\nfunction getDefaultAsyncThrottlerState<\n  TFn extends AnyAsyncFunction,\n>(): AsyncThrottlerState<TFn> {\n  return structuredClone({\n    errorCount: 0,\n    isExecuting: false,\n    isPending: false,\n    lastArgs: undefined,\n    lastExecutionTime: 0,\n    lastResult: undefined,\n    nextExecutionTime: 0,\n    settleCount: 0,\n    status: 'idle',\n    successCount: 0,\n  })\n}\n\n/**\n * Options for configuring an async throttled function\n */\nexport interface AsyncThrottlerOptions<TFn extends AnyAsyncFunction> {\n  /**\n   * Whether the throttler is enabled. When disabled, maybeExecute will not trigger any executions.\n   * Can be a boolean or a function that returns a boolean.\n   * Defaults to true.\n   */\n  enabled?: boolean | ((throttler: AsyncThrottler<TFn>) => boolean)\n  /**\n   * Initial state for the async throttler\n   */\n  initialState?: Partial<AsyncThrottlerState<TFn>>\n  /**\n   * Whether to execute the function immediately when called\n   * Defaults to true\n   */\n  leading?: boolean\n  /**\n   * Optional error handler for when the throttled function throws.\n   * If provided, the handler will be called with the error and throttler instance.\n   * This can be used alongside throwOnError - the handler will be called before any error is thrown.\n   */\n  onError?: (error: unknown, asyncThrottler: AsyncThrottler<TFn>) => void\n  /**\n   * Optional function to call when the throttled function is executed\n   */\n  onSettled?: (asyncThrottler: AsyncThrottler<TFn>) => void\n  /**\n   * Optional function to call when the throttled function is executed\n   */\n  onSuccess?: (\n    result: ReturnType<TFn>,\n    asyncThrottler: AsyncThrottler<TFn>,\n  ) => void\n  /**\n   * Whether to throw errors when they occur.\n   * Defaults to true if no onError handler is provided, false if an onError handler is provided.\n   * Can be explicitly set to override these defaults.\n   */\n  throwOnError?: boolean\n  /**\n   * Whether to execute the function on the trailing edge of the wait period\n   * Defaults to true\n   */\n  trailing?: boolean\n  /**\n   * Time window in milliseconds during which the function can only be executed once.\n   * Can be a number or a function that returns a number.\n   * Defaults to 0ms\n   */\n  wait: number | ((throttler: AsyncThrottler<TFn>) => number)\n}\n\ntype AsyncThrottlerOptionsWithOptionalCallbacks = OptionalKeys<\n  AsyncThrottlerOptions<any>,\n  'initialState' | 'onError' | 'onSettled' | 'onSuccess'\n>\n\nconst defaultOptions: AsyncThrottlerOptionsWithOptionalCallbacks = {\n  enabled: true,\n  leading: true,\n  trailing: true,\n  wait: 0,\n}\n\n/**\n * A class that creates an async throttled function.\n *\n * Throttling limits how often a function can be executed, allowing only one execution within a specified time window.\n * Unlike debouncing which resets the delay timer on each call, throttling ensures the function executes at a\n * regular interval regardless of how often it's called.\n *\n * Unlike the non-async Throttler, this async version supports returning values from the throttled function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the throttled function.\n *\n * This is useful for rate-limiting API calls, handling scroll/resize events, or any scenario where you want to\n * ensure a maximum execution frequency.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and throttler instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncThrottler instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async throttler\n * - Use `onSuccess` callback to react to successful function execution and implement custom logic\n * - Use `onError` callback to react to function execution errors and implement custom error handling\n * - Use `onSettled` callback to react to function execution completion (success or error) and implement custom logic\n * - The state includes error count, execution status, last execution time, and success/settle counts\n * - State can be accessed via `asyncThrottler.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `asyncThrottler.state`\n *\n * @example\n * ```ts\n * const throttler = new AsyncThrottler(async (value: string) => {\n *   const result = await saveToAPI(value);\n *   return result; // Return value is preserved\n * }, {\n *   wait: 1000,\n *   onError: (error) => {\n *     console.error('API call failed:', error);\n *   }\n * });\n *\n * // Will only execute once per second no matter how often called\n * // Returns the API response directly\n * const result = await throttler.maybeExecute(inputElement.value);\n * ```\n */\nexport class AsyncThrottler<TFn extends AnyAsyncFunction> {\n  readonly store: Store<Readonly<AsyncThrottlerState<TFn>>> = new Store<\n    AsyncThrottlerState<TFn>\n  >(getDefaultAsyncThrottlerState<TFn>())\n  options: AsyncThrottlerOptions<TFn>\n  #abortController: AbortController | null = null\n  #timeoutId: NodeJS.Timeout | null = null\n  #resolvePreviousPromise:\n    | ((value?: ReturnType<TFn> | undefined) => void)\n    | null = null\n\n  constructor(\n    private fn: TFn,\n    initialOptions: AsyncThrottlerOptions<TFn>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n      throwOnError: initialOptions.throwOnError ?? !initialOptions.onError,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the async throttler options\n   */\n  setOptions = (newOptions: Partial<AsyncThrottlerOptions<TFn>>): void => {\n    this.options = { ...this.options, ...newOptions }\n\n    // End the pending state if the throttler is disabled\n    if (!this.#getEnabled()) {\n      this.cancel()\n    }\n  }\n\n  #setState = (newState: Partial<AsyncThrottlerState<TFn>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const { isPending, isExecuting, settleCount } = combinedState\n      return {\n        ...combinedState,\n        status: !this.#getEnabled()\n          ? 'disabled'\n          : isPending\n            ? 'pending'\n            : isExecuting\n              ? 'executing'\n              : settleCount > 0\n                ? 'settled'\n                : 'idle',\n      }\n    })\n  }\n\n  /**\n   * Returns the current enabled state of the async throttler\n   */\n  #getEnabled = (): boolean => {\n    return !!parseFunctionOrValue(this.options.enabled, this)\n  }\n\n  /**\n   * Returns the current wait time in milliseconds\n   */\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait, this)\n  }\n\n  /**\n   * Attempts to execute the throttled function. The execution behavior depends on the throttler options:\n   *\n   * - If enough time has passed since the last execution (>= wait period):\n   *   - With leading=true: Executes immediately\n   *   - With leading=false: Waits for the next trailing execution\n   *\n   * - If within the wait period:\n   *   - With trailing=true: Schedules execution for end of wait period\n   *   - With trailing=false: Drops the execution\n   *\n   * @example\n   * ```ts\n   * const throttled = new AsyncThrottler(fn, { wait: 1000 });\n   *\n   * // First call executes immediately\n   * await throttled.maybeExecute('a', 'b');\n   *\n   * // Call during wait period - gets throttled\n   * await throttled.maybeExecute('c', 'd');\n   * ```\n   */\n  maybeExecute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    if (!this.#getEnabled()) return undefined\n    const now = Date.now()\n    const timeSinceLastExecution = now - this.store.state.lastExecutionTime\n    const wait = this.#getWait()\n    // Store the most recent arguments for potential trailing execution\n    this.#setState({ lastArgs: args })\n\n    this.#resolvePreviousPromiseInternal()\n\n    // Handle leading execution\n    if (this.options.leading && timeSinceLastExecution >= wait) {\n      await this.#execute(...args)\n      return this.store.state.lastResult\n    } else {\n      return new Promise((resolve) => {\n        this.#resolvePreviousPromise = resolve\n        // Clear any existing timeout to ensure we use the latest arguments\n        this.#clearTimeout()\n\n        // Set up trailing execution if enabled\n        if (this.options.trailing) {\n          const _timeSinceLastExecution = this.store.state.lastExecutionTime\n            ? now - this.store.state.lastExecutionTime\n            : 0\n          const timeoutDuration = wait - _timeSinceLastExecution\n          this.#setState({ isPending: true })\n          this.#timeoutId = setTimeout(async () => {\n            if (this.store.state.lastArgs !== undefined) {\n              await this.#execute(...this.store.state.lastArgs)\n            }\n            this.#resolvePreviousPromise = null\n            resolve(this.store.state.lastResult)\n          }, timeoutDuration)\n        }\n      })\n    }\n  }\n\n  #execute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    if (!this.#getEnabled() || this.store.state.isExecuting) return undefined\n    this.#abortController = new AbortController()\n    try {\n      this.#setState({ isExecuting: true })\n      const result = await this.fn(...args) // EXECUTE!\n      this.#setState({\n        lastResult: result,\n        successCount: this.store.state.successCount + 1,\n      })\n      this.options.onSuccess?.(result, this)\n    } catch (error) {\n      this.#setState({\n        errorCount: this.store.state.errorCount + 1,\n      })\n      this.options.onError?.(error, this)\n      if (this.options.throwOnError) {\n        throw error\n      } else {\n        console.error(error)\n      }\n    } finally {\n      const lastExecutionTime = Date.now()\n      const nextExecutionTime = lastExecutionTime + this.#getWait()\n      this.#setState({\n        isExecuting: false,\n        isPending: false,\n        settleCount: this.store.state.settleCount + 1,\n        lastExecutionTime,\n        nextExecutionTime,\n      })\n      this.#abortController = null\n      this.options.onSettled?.(this)\n    }\n    return this.store.state.lastResult\n  }\n\n  /**\n   * Processes the current pending execution immediately\n   */\n  flush = (): void => {\n    if (this.store.state.isPending && this.store.state.lastArgs) {\n      this.#abortExecution() // abort any current execution\n      this.#clearTimeout() // clear any existing timeout\n      this.#execute(...this.store.state.lastArgs)\n    }\n  }\n\n  #resolvePreviousPromiseInternal = (): void => {\n    if (this.#resolvePreviousPromise) {\n      this.#resolvePreviousPromise(this.store.state.lastResult)\n      this.#resolvePreviousPromise = null\n    }\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = null\n    }\n  }\n\n  #cancelPendingExecution = (): void => {\n    this.#clearTimeout()\n    if (this.#resolvePreviousPromise) {\n      this.#resolvePreviousPromise(this.store.state.lastResult)\n      this.#resolvePreviousPromise = null\n    }\n    this.#setState({\n      isPending: false,\n      isExecuting: false,\n      lastArgs: undefined,\n    })\n  }\n\n  #abortExecution = (): void => {\n    if (this.#abortController) {\n      this.#abortController.abort()\n      this.#abortController = null\n    }\n  }\n\n  /**\n   * Cancels any pending execution or aborts any execution in progress\n   */\n  cancel = (): void => {\n    this.#cancelPendingExecution()\n    this.#abortExecution()\n  }\n\n  /**\n   * Resets the debouncer state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultAsyncThrottlerState<TFn>())\n  }\n}\n\n/**\n * Creates an async throttled function that limits how often the function can execute.\n * The throttled function will execute at most once per wait period, even if called multiple times.\n * If called while executing, it will wait until execution completes before scheduling the next call.\n *\n * Unlike the non-async Throttler, this async version supports returning values from the throttled function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the throttled function.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and throttler instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncThrottler instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async throttler\n * - Use `onSuccess` callback to react to successful function execution and implement custom logic\n * - Use `onError` callback to react to function execution errors and implement custom error handling\n * - Use `onSettled` callback to react to function execution completion (success or error) and implement custom logic\n * - The state includes error count, execution status, last execution time, and success/settle counts\n * - State can be accessed via the underlying AsyncThrottler instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * @example\n * ```ts\n * const throttled = asyncThrottle(async (value: string) => {\n *   const result = await saveToAPI(value);\n *   return result; // Return value is preserved\n * }, {\n *   wait: 1000,\n *   onError: (error) => {\n *     console.error('API call failed:', error);\n *   }\n * });\n *\n * // This will execute at most once per second\n * // Returns the API response directly\n * const result = await throttled(inputElement.value);\n * ```\n */\nexport function asyncThrottle<TFn extends AnyAsyncFunction>(\n  fn: TFn,\n  initialOptions: AsyncThrottlerOptions<TFn>,\n) {\n  const asyncThrottler = new AsyncThrottler(fn, initialOptions)\n  return asyncThrottler.maybeExecute\n}\n"],"names":[],"mappings":";;AA+CA,SAAS,gCAEqB;AAC5B,SAAO,gBAAgB;AAAA,IACrB,YAAY;AAAA,IACZ,aAAa;AAAA,IACb,WAAW;AAAA,IACX,UAAU;AAAA,IACV,mBAAmB;AAAA,IACnB,YAAY;AAAA,IACZ,mBAAmB;AAAA,IACnB,aAAa;AAAA,IACb,QAAQ;AAAA,IACR,cAAc;AAAA,EAAA,CACf;AACH;AA8DA,MAAM,iBAA6D;AAAA,EACjE,SAAS;AAAA,EACT,SAAS;AAAA,EACT,UAAU;AAAA,EACV,MAAM;AACR;AAkDO,MAAM,eAA6C;AAAA,EAWxD,YACU,IACR,gBACA;AAFQ,SAAA,KAAA;AAXV,SAAS,QAAmD,IAAI,MAE9D,8BAAA,CAAoC;AAEtC,SAAA,mBAA2C;AAC3C,SAAA,aAAoC;AACpC,SAAA,0BAEW;AAiBX,SAAA,aAAa,CAAC,eAA0D;AACtE,WAAK,UAAU,EAAE,GAAG,KAAK,SAAS,GAAG,WAAA;AAGrC,UAAI,CAAC,KAAK,eAAe;AACvB,aAAK,OAAA;AAAA,MAAO;AAAA,IACd;AAGF,SAAA,YAAY,CAAC,aAAsD;AACjE,WAAK,MAAM,SAAS,CAAC,UAAU;AAC7B,cAAM,gBAAgB;AAAA,UACpB,GAAG;AAAA,UACH,GAAG;AAAA,QAAA;AAEL,cAAM,EAAE,WAAW,aAAa,YAAA,IAAgB;AAChD,eAAO;AAAA,UACL,GAAG;AAAA,UACH,QAAQ,CAAC,KAAK,YAAA,IACV,aACA,YACE,YACA,cACE,cACA,cAAc,IACZ,YACA;AAAA,QAAA;AAAA,MACZ,CACD;AAAA,IAAA;AAMH,SAAA,cAAc,MAAe;AAC3B,aAAO,CAAC,CAAC,qBAAqB,KAAK,QAAQ,SAAS,IAAI;AAAA,IAAA;AAM1D,SAAA,WAAW,MAAc;AACvB,aAAO,qBAAqB,KAAK,QAAQ,MAAM,IAAI;AAAA,IAAA;AAyBrD,SAAA,eAAe,UACV,SACsC;AACzC,UAAI,CAAC,KAAK,YAAA,EAAe,QAAO;AAChC,YAAM,MAAM,KAAK,IAAA;AACjB,YAAM,yBAAyB,MAAM,KAAK,MAAM,MAAM;AACtD,YAAM,OAAO,KAAK,SAAA;AAElB,WAAK,UAAU,EAAE,UAAU,KAAA,CAAM;AAEjC,WAAK,gCAAA;AAGL,UAAI,KAAK,QAAQ,WAAW,0BAA0B,MAAM;AAC1D,cAAM,KAAK,SAAS,GAAG,IAAI;AAC3B,eAAO,KAAK,MAAM,MAAM;AAAA,MAAA,OACnB;AACL,eAAO,IAAI,QAAQ,CAAC,YAAY;AAC9B,eAAK,0BAA0B;AAE/B,eAAK,cAAA;AAGL,cAAI,KAAK,QAAQ,UAAU;AACzB,kBAAM,0BAA0B,KAAK,MAAM,MAAM,oBAC7C,MAAM,KAAK,MAAM,MAAM,oBACvB;AACJ,kBAAM,kBAAkB,OAAO;AAC/B,iBAAK,UAAU,EAAE,WAAW,KAAA,CAAM;AAClC,iBAAK,aAAa,WAAW,YAAY;AACvC,kBAAI,KAAK,MAAM,MAAM,aAAa,QAAW;AAC3C,sBAAM,KAAK,SAAS,GAAG,KAAK,MAAM,MAAM,QAAQ;AAAA,cAAA;AAElD,mBAAK,0BAA0B;AAC/B,sBAAQ,KAAK,MAAM,MAAM,UAAU;AAAA,YAAA,GAClC,eAAe;AAAA,UAAA;AAAA,QACpB,CACD;AAAA,MAAA;AAAA,IACH;AAGF,SAAA,WAAW,UACN,SACsC;AACzC,UAAI,CAAC,KAAK,iBAAiB,KAAK,MAAM,MAAM,YAAa,QAAO;AAChE,WAAK,mBAAmB,IAAI,gBAAA;AAC5B,UAAI;AACF,aAAK,UAAU,EAAE,aAAa,KAAA,CAAM;AACpC,cAAM,SAAS,MAAM,KAAK,GAAG,GAAG,IAAI;AACpC,aAAK,UAAU;AAAA,UACb,YAAY;AAAA,UACZ,cAAc,KAAK,MAAM,MAAM,eAAe;AAAA,QAAA,CAC/C;AACD,aAAK,QAAQ,YAAY,QAAQ,IAAI;AAAA,MAAA,SAC9B,OAAO;AACd,aAAK,UAAU;AAAA,UACb,YAAY,KAAK,MAAM,MAAM,aAAa;AAAA,QAAA,CAC3C;AACD,aAAK,QAAQ,UAAU,OAAO,IAAI;AAClC,YAAI,KAAK,QAAQ,cAAc;AAC7B,gBAAM;AAAA,QAAA,OACD;AACL,kBAAQ,MAAM,KAAK;AAAA,QAAA;AAAA,MACrB,UACF;AACE,cAAM,oBAAoB,KAAK,IAAA;AAC/B,cAAM,oBAAoB,oBAAoB,KAAK,SAAA;AACnD,aAAK,UAAU;AAAA,UACb,aAAa;AAAA,UACb,WAAW;AAAA,UACX,aAAa,KAAK,MAAM,MAAM,cAAc;AAAA,UAC5C;AAAA,UACA;AAAA,QAAA,CACD;AACD,aAAK,mBAAmB;AACxB,aAAK,QAAQ,YAAY,IAAI;AAAA,MAAA;AAE/B,aAAO,KAAK,MAAM,MAAM;AAAA,IAAA;AAM1B,SAAA,QAAQ,MAAY;AAClB,UAAI,KAAK,MAAM,MAAM,aAAa,KAAK,MAAM,MAAM,UAAU;AAC3D,aAAK,gBAAA;AACL,aAAK,cAAA;AACL,aAAK,SAAS,GAAG,KAAK,MAAM,MAAM,QAAQ;AAAA,MAAA;AAAA,IAC5C;AAGF,SAAA,kCAAkC,MAAY;AAC5C,UAAI,KAAK,yBAAyB;AAChC,aAAK,wBAAwB,KAAK,MAAM,MAAM,UAAU;AACxD,aAAK,0BAA0B;AAAA,MAAA;AAAA,IACjC;AAGF,SAAA,gBAAgB,MAAY;AAC1B,UAAI,KAAK,YAAY;AACnB,qBAAa,KAAK,UAAU;AAC5B,aAAK,aAAa;AAAA,MAAA;AAAA,IACpB;AAGF,SAAA,0BAA0B,MAAY;AACpC,WAAK,cAAA;AACL,UAAI,KAAK,yBAAyB;AAChC,aAAK,wBAAwB,KAAK,MAAM,MAAM,UAAU;AACxD,aAAK,0BAA0B;AAAA,MAAA;AAEjC,WAAK,UAAU;AAAA,QACb,WAAW;AAAA,QACX,aAAa;AAAA,QACb,UAAU;AAAA,MAAA,CACX;AAAA,IAAA;AAGH,SAAA,kBAAkB,MAAY;AAC5B,UAAI,KAAK,kBAAkB;AACzB,aAAK,iBAAiB,MAAA;AACtB,aAAK,mBAAmB;AAAA,MAAA;AAAA,IAC1B;AAMF,SAAA,SAAS,MAAY;AACnB,WAAK,wBAAA;AACL,WAAK,gBAAA;AAAA,IAAgB;AAMvB,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,+BAAoC;AAAA,IAAA;AAvNnD,SAAK,UAAU;AAAA,MACb,GAAG;AAAA,MACH,GAAG;AAAA,MACH,cAAc,eAAe,gBAAgB,CAAC,eAAe;AAAA,IAAA;AAE/D,SAAK,UAAU,KAAK,QAAQ,gBAAgB,CAAA,CAAE;AAAA,EAAA;AAAA,EAfhD;AAAA,EACA;AAAA,EACA;AAAA,EA4BA;AAAA,EAyBA;AAAA,EAOA;AAAA,EAmEA;AAAA,EAkDA;AAAA,EAOA;AAAA,EAOA;AAAA,EAaA;AAqBF;AA6CO,SAAS,cACd,IACA,gBACA;AACA,QAAM,iBAAiB,IAAI,eAAe,IAAI,cAAc;AAC5D,SAAO,eAAe;AACxB;"}
+{"version":3,"file":"async-throttler.js","sources":["../../src/async-throttler.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { AnyAsyncFunction, OptionalKeys } from './types'\n\nexport interface AsyncThrottlerState<TFn extends AnyAsyncFunction> {\n  /**\n   * Number of function executions that have resulted in errors\n   */\n  errorCount: number\n  /**\n   * Whether the throttled function is currently executing asynchronously\n   */\n  isExecuting: boolean\n  /**\n   * Whether the throttler is waiting for the timeout to trigger execution\n   */\n  isPending: boolean\n  /**\n   * The arguments from the most recent call to maybeExecute\n   */\n  lastArgs: Parameters<TFn> | undefined\n  /**\n   * Timestamp of the last function execution in milliseconds\n   */\n  lastExecutionTime: number\n  /**\n   * The result from the most recent successful function execution\n   */\n  lastResult: ReturnType<TFn> | undefined\n  /**\n   * Timestamp when the next execution can occur in milliseconds\n   */\n  nextExecutionTime: number\n  /**\n   * Number of function executions that have completed (either successfully or with errors)\n   */\n  settleCount: number\n  /**\n   * Current execution status - 'idle' when not active, 'pending' when waiting, 'executing' when running, 'settled' when completed\n   */\n  status: 'disabled' | 'idle' | 'pending' | 'executing' | 'settled'\n  /**\n   * Number of function executions that have completed successfully\n   */\n  successCount: number\n}\n\nfunction getDefaultAsyncThrottlerState<\n  TFn extends AnyAsyncFunction,\n>(): AsyncThrottlerState<TFn> {\n  return structuredClone({\n    errorCount: 0,\n    isExecuting: false,\n    isPending: false,\n    lastArgs: undefined,\n    lastExecutionTime: 0,\n    lastResult: undefined,\n    nextExecutionTime: 0,\n    settleCount: 0,\n    status: 'idle',\n    successCount: 0,\n  })\n}\n\n/**\n * Options for configuring an async throttled function\n */\nexport interface AsyncThrottlerOptions<TFn extends AnyAsyncFunction> {\n  /**\n   * Whether the throttler is enabled. When disabled, maybeExecute will not trigger any executions.\n   * Can be a boolean or a function that returns a boolean.\n   * Defaults to true.\n   */\n  enabled?: boolean | ((throttler: AsyncThrottler<TFn>) => boolean)\n  /**\n   * Initial state for the async throttler\n   */\n  initialState?: Partial<AsyncThrottlerState<TFn>>\n  /**\n   * Whether to execute the function immediately when called\n   * Defaults to true\n   */\n  leading?: boolean\n  /**\n   * Optional error handler for when the throttled function throws.\n   * If provided, the handler will be called with the error and throttler instance.\n   * This can be used alongside throwOnError - the handler will be called before any error is thrown.\n   */\n  onError?: (error: unknown, asyncThrottler: AsyncThrottler<TFn>) => void\n  /**\n   * Optional function to call when the throttled function is executed\n   */\n  onSettled?: (asyncThrottler: AsyncThrottler<TFn>) => void\n  /**\n   * Optional function to call when the throttled function is executed\n   */\n  onSuccess?: (\n    result: ReturnType<TFn>,\n    asyncThrottler: AsyncThrottler<TFn>,\n  ) => void\n  /**\n   * Whether to throw errors when they occur.\n   * Defaults to true if no onError handler is provided, false if an onError handler is provided.\n   * Can be explicitly set to override these defaults.\n   */\n  throwOnError?: boolean\n  /**\n   * Whether to execute the function on the trailing edge of the wait period\n   * Defaults to true\n   */\n  trailing?: boolean\n  /**\n   * Time window in milliseconds during which the function can only be executed once.\n   * Can be a number or a function that returns a number.\n   * Defaults to 0ms\n   */\n  wait: number | ((throttler: AsyncThrottler<TFn>) => number)\n}\n\ntype AsyncThrottlerOptionsWithOptionalCallbacks = OptionalKeys<\n  AsyncThrottlerOptions<any>,\n  'initialState' | 'onError' | 'onSettled' | 'onSuccess'\n>\n\nconst defaultOptions: AsyncThrottlerOptionsWithOptionalCallbacks = {\n  enabled: true,\n  leading: true,\n  trailing: true,\n  wait: 0,\n}\n\n/**\n * A class that creates an async throttled function.\n *\n * Throttling limits how often a function can be executed, allowing only one execution within a specified time window.\n * Unlike debouncing which resets the delay timer on each call, throttling ensures the function executes at a\n * regular interval regardless of how often it's called.\n *\n * Unlike the non-async Throttler, this async version supports returning values from the throttled function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the throttled function.\n *\n * This is useful for rate-limiting API calls, handling scroll/resize events, or any scenario where you want to\n * ensure a maximum execution frequency.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and throttler instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncThrottler instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async throttler\n * - Use `onSuccess` callback to react to successful function execution and implement custom logic\n * - Use `onError` callback to react to function execution errors and implement custom error handling\n * - Use `onSettled` callback to react to function execution completion (success or error) and implement custom logic\n * - The state includes error count, execution status, last execution time, and success/settle counts\n * - State can be accessed via `asyncThrottler.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `asyncThrottler.state`\n *\n * @example\n * ```ts\n * const throttler = new AsyncThrottler(async (value: string) => {\n *   const result = await saveToAPI(value);\n *   return result; // Return value is preserved\n * }, {\n *   wait: 1000,\n *   onError: (error) => {\n *     console.error('API call failed:', error);\n *   }\n * });\n *\n * // Will only execute once per second no matter how often called\n * // Returns the API response directly\n * const result = await throttler.maybeExecute(inputElement.value);\n * ```\n */\nexport class AsyncThrottler<TFn extends AnyAsyncFunction> {\n  readonly store: Store<Readonly<AsyncThrottlerState<TFn>>> = new Store<\n    AsyncThrottlerState<TFn>\n  >(getDefaultAsyncThrottlerState<TFn>())\n  options: AsyncThrottlerOptions<TFn>\n  #abortController: AbortController | null = null\n  #timeoutId: NodeJS.Timeout | null = null\n  #resolvePreviousPromise:\n    | ((value?: ReturnType<TFn> | undefined) => void)\n    | null = null\n  #rejectPreviousPromise: ((reason?: unknown) => void) | null = null\n\n  constructor(\n    private fn: TFn,\n    initialOptions: AsyncThrottlerOptions<TFn>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n      throwOnError: initialOptions.throwOnError ?? !initialOptions.onError,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the async throttler options\n   */\n  setOptions = (newOptions: Partial<AsyncThrottlerOptions<TFn>>): void => {\n    this.options = { ...this.options, ...newOptions }\n\n    // End the pending state if the throttler is disabled\n    if (!this.#getEnabled()) {\n      this.cancel()\n    }\n  }\n\n  #setState = (newState: Partial<AsyncThrottlerState<TFn>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const { isPending, isExecuting, settleCount } = combinedState\n      return {\n        ...combinedState,\n        status: !this.#getEnabled()\n          ? 'disabled'\n          : isPending\n            ? 'pending'\n            : isExecuting\n              ? 'executing'\n              : settleCount > 0\n                ? 'settled'\n                : 'idle',\n      }\n    })\n  }\n\n  /**\n   * Returns the current enabled state of the async throttler\n   */\n  #getEnabled = (): boolean => {\n    return !!parseFunctionOrValue(this.options.enabled, this)\n  }\n\n  /**\n   * Returns the current wait time in milliseconds\n   */\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait, this)\n  }\n\n  /**\n   * Attempts to execute the throttled function. The execution behavior depends on the throttler options:\n   *\n   * - If enough time has passed since the last execution (>= wait period):\n   *   - With leading=true: Executes immediately\n   *   - With leading=false: Waits for the next trailing execution\n   *\n   * - If within the wait period:\n   *   - With trailing=true: Schedules execution for end of wait period\n   *   - With trailing=false: Drops the execution\n   *\n   * @example\n   * ```ts\n   * const throttled = new AsyncThrottler(fn, { wait: 1000 });\n   *\n   * // First call executes immediately\n   * await throttled.maybeExecute('a', 'b');\n   *\n   * // Call during wait period - gets throttled\n   * await throttled.maybeExecute('c', 'd');\n   * ```\n   */\n  maybeExecute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    if (!this.#getEnabled()) return undefined\n    const now = Date.now()\n    const timeSinceLastExecution = now - this.store.state.lastExecutionTime\n    const wait = this.#getWait()\n    // Store the most recent arguments for potential trailing execution\n    this.#setState({ lastArgs: args })\n\n    this.#resolvePreviousPromiseInternal()\n\n    // Handle leading execution\n    if (this.options.leading && timeSinceLastExecution >= wait) {\n      await this.#execute(...args)\n      return this.store.state.lastResult\n    } else {\n      return new Promise((resolve, reject) => {\n        this.#resolvePreviousPromise = resolve\n        this.#rejectPreviousPromise = reject\n        // Clear any existing timeout to ensure we use the latest arguments\n        this.#clearTimeout()\n\n        // Set up trailing execution if enabled\n        if (this.options.trailing) {\n          const _timeSinceLastExecution = this.store.state.lastExecutionTime\n            ? now - this.store.state.lastExecutionTime\n            : 0\n          const timeoutDuration = wait - _timeSinceLastExecution\n          this.#setState({ isPending: true })\n          this.#timeoutId = setTimeout(async () => {\n            if (this.store.state.lastArgs !== undefined) {\n              await this.#execute(...this.store.state.lastArgs)\n            }\n            this.#resolvePreviousPromise = null\n            resolve(this.store.state.lastResult)\n          }, timeoutDuration)\n        }\n      })\n    }\n  }\n\n  #execute = async (\n    ...args: Parameters<TFn>\n  ): Promise<ReturnType<TFn> | undefined> => {\n    if (!this.#getEnabled() || this.store.state.isExecuting) return undefined\n    this.#abortController = new AbortController()\n    try {\n      this.#setState({ isExecuting: true })\n      const result = await this.fn(...args) // EXECUTE!\n      this.#setState({\n        lastResult: result,\n        successCount: this.store.state.successCount + 1,\n      })\n      this.options.onSuccess?.(result, this)\n    } catch (error) {\n      this.#setState({\n        errorCount: this.store.state.errorCount + 1,\n      })\n      this.options.onError?.(error, this)\n      if (this.options.throwOnError) {\n        this.#rejectPreviousPromiseInternal(error)\n      }\n    } finally {\n      const lastExecutionTime = Date.now()\n      const nextExecutionTime = lastExecutionTime + this.#getWait()\n      this.#setState({\n        isExecuting: false,\n        isPending: false,\n        settleCount: this.store.state.settleCount + 1,\n        lastExecutionTime,\n        nextExecutionTime,\n      })\n      this.#abortController = null\n      this.options.onSettled?.(this)\n    }\n    return this.store.state.lastResult\n  }\n\n  /**\n   * Processes the current pending execution immediately\n   */\n  flush = async (): Promise<ReturnType<TFn> | undefined> => {\n    if (this.store.state.isPending && this.store.state.lastArgs) {\n      this.#abortExecution() // abort any current execution\n      this.#clearTimeout() // clear any existing timeout\n      const result = await this.#execute(...this.store.state.lastArgs)\n\n      // Resolve any pending promise from maybeExecute\n      this.#resolvePreviousPromiseInternal()\n\n      return result\n    }\n    return undefined\n  }\n\n  #resolvePreviousPromiseInternal = (): void => {\n    if (this.#resolvePreviousPromise) {\n      this.#resolvePreviousPromise(this.store.state.lastResult)\n      this.#resolvePreviousPromise = null\n    }\n  }\n\n  #rejectPreviousPromiseInternal = (error: unknown): void => {\n    if (this.#rejectPreviousPromise) {\n      this.#rejectPreviousPromise(error)\n      this.#rejectPreviousPromise = null\n    }\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = null\n    }\n  }\n\n  #cancelPendingExecution = (): void => {\n    this.#clearTimeout()\n    if (this.#resolvePreviousPromise) {\n      this.#resolvePreviousPromise(this.store.state.lastResult)\n      this.#resolvePreviousPromise = null\n    }\n    this.#setState({\n      isPending: false,\n      isExecuting: false,\n      lastArgs: undefined,\n    })\n  }\n\n  #abortExecution = (): void => {\n    if (this.#abortController) {\n      this.#abortController.abort()\n      this.#abortController = null\n    }\n  }\n\n  /**\n   * Cancels any pending execution or aborts any execution in progress\n   */\n  cancel = (): void => {\n    this.#cancelPendingExecution()\n    this.#abortExecution()\n  }\n\n  /**\n   * Resets the debouncer state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultAsyncThrottlerState<TFn>())\n  }\n}\n\n/**\n * Creates an async throttled function that limits how often the function can execute.\n * The throttled function will execute at most once per wait period, even if called multiple times.\n * If called while executing, it will wait until execution completes before scheduling the next call.\n *\n * Unlike the non-async Throttler, this async version supports returning values from the throttled function,\n * making it ideal for API calls and other async operations where you want the result of the `maybeExecute` call\n * instead of setting the result on a state variable from within the throttled function.\n *\n * Error Handling:\n * - If an `onError` handler is provided, it will be called with the error and throttler instance\n * - If `throwOnError` is true (default when no onError handler is provided), the error will be thrown\n * - If `throwOnError` is false (default when onError handler is provided), the error will be swallowed\n * - Both onError and throwOnError can be used together - the handler will be called before any error is thrown\n * - The error state can be checked using the underlying AsyncThrottler instance\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the async throttler\n * - Use `onSuccess` callback to react to successful function execution and implement custom logic\n * - Use `onError` callback to react to function execution errors and implement custom error handling\n * - Use `onSettled` callback to react to function execution completion (success or error) and implement custom logic\n * - The state includes error count, execution status, last execution time, and success/settle counts\n * - State can be accessed via the underlying AsyncThrottler instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * @example\n * ```ts\n * const throttled = asyncThrottle(async (value: string) => {\n *   const result = await saveToAPI(value);\n *   return result; // Return value is preserved\n * }, {\n *   wait: 1000,\n *   onError: (error) => {\n *     console.error('API call failed:', error);\n *   }\n * });\n *\n * // This will execute at most once per second\n * // Returns the API response directly\n * const result = await throttled(inputElement.value);\n * ```\n */\nexport function asyncThrottle<TFn extends AnyAsyncFunction>(\n  fn: TFn,\n  initialOptions: AsyncThrottlerOptions<TFn>,\n) {\n  const asyncThrottler = new AsyncThrottler(fn, initialOptions)\n  return asyncThrottler.maybeExecute\n}\n"],"names":[],"mappings":";;AA+CA,SAAS,gCAEqB;AAC5B,SAAO,gBAAgB;AAAA,IACrB,YAAY;AAAA,IACZ,aAAa;AAAA,IACb,WAAW;AAAA,IACX,UAAU;AAAA,IACV,mBAAmB;AAAA,IACnB,YAAY;AAAA,IACZ,mBAAmB;AAAA,IACnB,aAAa;AAAA,IACb,QAAQ;AAAA,IACR,cAAc;AAAA,EAAA,CACf;AACH;AA8DA,MAAM,iBAA6D;AAAA,EACjE,SAAS;AAAA,EACT,SAAS;AAAA,EACT,UAAU;AAAA,EACV,MAAM;AACR;AAkDO,MAAM,eAA6C;AAAA,EAYxD,YACU,IACR,gBACA;AAFQ,SAAA,KAAA;AAZV,SAAS,QAAmD,IAAI,MAE9D,8BAAA,CAAoC;AAEtC,SAAA,mBAA2C;AAC3C,SAAA,aAAoC;AACpC,SAAA,0BAEW;AACX,SAAA,yBAA8D;AAiB9D,SAAA,aAAa,CAAC,eAA0D;AACtE,WAAK,UAAU,EAAE,GAAG,KAAK,SAAS,GAAG,WAAA;AAGrC,UAAI,CAAC,KAAK,eAAe;AACvB,aAAK,OAAA;AAAA,MAAO;AAAA,IACd;AAGF,SAAA,YAAY,CAAC,aAAsD;AACjE,WAAK,MAAM,SAAS,CAAC,UAAU;AAC7B,cAAM,gBAAgB;AAAA,UACpB,GAAG;AAAA,UACH,GAAG;AAAA,QAAA;AAEL,cAAM,EAAE,WAAW,aAAa,YAAA,IAAgB;AAChD,eAAO;AAAA,UACL,GAAG;AAAA,UACH,QAAQ,CAAC,KAAK,YAAA,IACV,aACA,YACE,YACA,cACE,cACA,cAAc,IACZ,YACA;AAAA,QAAA;AAAA,MACZ,CACD;AAAA,IAAA;AAMH,SAAA,cAAc,MAAe;AAC3B,aAAO,CAAC,CAAC,qBAAqB,KAAK,QAAQ,SAAS,IAAI;AAAA,IAAA;AAM1D,SAAA,WAAW,MAAc;AACvB,aAAO,qBAAqB,KAAK,QAAQ,MAAM,IAAI;AAAA,IAAA;AAyBrD,SAAA,eAAe,UACV,SACsC;AACzC,UAAI,CAAC,KAAK,YAAA,EAAe,QAAO;AAChC,YAAM,MAAM,KAAK,IAAA;AACjB,YAAM,yBAAyB,MAAM,KAAK,MAAM,MAAM;AACtD,YAAM,OAAO,KAAK,SAAA;AAElB,WAAK,UAAU,EAAE,UAAU,KAAA,CAAM;AAEjC,WAAK,gCAAA;AAGL,UAAI,KAAK,QAAQ,WAAW,0BAA0B,MAAM;AAC1D,cAAM,KAAK,SAAS,GAAG,IAAI;AAC3B,eAAO,KAAK,MAAM,MAAM;AAAA,MAAA,OACnB;AACL,eAAO,IAAI,QAAQ,CAAC,SAAS,WAAW;AACtC,eAAK,0BAA0B;AAC/B,eAAK,yBAAyB;AAE9B,eAAK,cAAA;AAGL,cAAI,KAAK,QAAQ,UAAU;AACzB,kBAAM,0BAA0B,KAAK,MAAM,MAAM,oBAC7C,MAAM,KAAK,MAAM,MAAM,oBACvB;AACJ,kBAAM,kBAAkB,OAAO;AAC/B,iBAAK,UAAU,EAAE,WAAW,KAAA,CAAM;AAClC,iBAAK,aAAa,WAAW,YAAY;AACvC,kBAAI,KAAK,MAAM,MAAM,aAAa,QAAW;AAC3C,sBAAM,KAAK,SAAS,GAAG,KAAK,MAAM,MAAM,QAAQ;AAAA,cAAA;AAElD,mBAAK,0BAA0B;AAC/B,sBAAQ,KAAK,MAAM,MAAM,UAAU;AAAA,YAAA,GAClC,eAAe;AAAA,UAAA;AAAA,QACpB,CACD;AAAA,MAAA;AAAA,IACH;AAGF,SAAA,WAAW,UACN,SACsC;AACzC,UAAI,CAAC,KAAK,iBAAiB,KAAK,MAAM,MAAM,YAAa,QAAO;AAChE,WAAK,mBAAmB,IAAI,gBAAA;AAC5B,UAAI;AACF,aAAK,UAAU,EAAE,aAAa,KAAA,CAAM;AACpC,cAAM,SAAS,MAAM,KAAK,GAAG,GAAG,IAAI;AACpC,aAAK,UAAU;AAAA,UACb,YAAY;AAAA,UACZ,cAAc,KAAK,MAAM,MAAM,eAAe;AAAA,QAAA,CAC/C;AACD,aAAK,QAAQ,YAAY,QAAQ,IAAI;AAAA,MAAA,SAC9B,OAAO;AACd,aAAK,UAAU;AAAA,UACb,YAAY,KAAK,MAAM,MAAM,aAAa;AAAA,QAAA,CAC3C;AACD,aAAK,QAAQ,UAAU,OAAO,IAAI;AAClC,YAAI,KAAK,QAAQ,cAAc;AAC7B,eAAK,+BAA+B,KAAK;AAAA,QAAA;AAAA,MAC3C,UACF;AACE,cAAM,oBAAoB,KAAK,IAAA;AAC/B,cAAM,oBAAoB,oBAAoB,KAAK,SAAA;AACnD,aAAK,UAAU;AAAA,UACb,aAAa;AAAA,UACb,WAAW;AAAA,UACX,aAAa,KAAK,MAAM,MAAM,cAAc;AAAA,UAC5C;AAAA,UACA;AAAA,QAAA,CACD;AACD,aAAK,mBAAmB;AACxB,aAAK,QAAQ,YAAY,IAAI;AAAA,MAAA;AAE/B,aAAO,KAAK,MAAM,MAAM;AAAA,IAAA;AAM1B,SAAA,QAAQ,YAAkD;AACxD,UAAI,KAAK,MAAM,MAAM,aAAa,KAAK,MAAM,MAAM,UAAU;AAC3D,aAAK,gBAAA;AACL,aAAK,cAAA;AACL,cAAM,SAAS,MAAM,KAAK,SAAS,GAAG,KAAK,MAAM,MAAM,QAAQ;AAG/D,aAAK,gCAAA;AAEL,eAAO;AAAA,MAAA;AAET,aAAO;AAAA,IAAA;AAGT,SAAA,kCAAkC,MAAY;AAC5C,UAAI,KAAK,yBAAyB;AAChC,aAAK,wBAAwB,KAAK,MAAM,MAAM,UAAU;AACxD,aAAK,0BAA0B;AAAA,MAAA;AAAA,IACjC;AAGF,SAAA,iCAAiC,CAAC,UAAyB;AACzD,UAAI,KAAK,wBAAwB;AAC/B,aAAK,uBAAuB,KAAK;AACjC,aAAK,yBAAyB;AAAA,MAAA;AAAA,IAChC;AAGF,SAAA,gBAAgB,MAAY;AAC1B,UAAI,KAAK,YAAY;AACnB,qBAAa,KAAK,UAAU;AAC5B,aAAK,aAAa;AAAA,MAAA;AAAA,IACpB;AAGF,SAAA,0BAA0B,MAAY;AACpC,WAAK,cAAA;AACL,UAAI,KAAK,yBAAyB;AAChC,aAAK,wBAAwB,KAAK,MAAM,MAAM,UAAU;AACxD,aAAK,0BAA0B;AAAA,MAAA;AAEjC,WAAK,UAAU;AAAA,QACb,WAAW;AAAA,QACX,aAAa;AAAA,QACb,UAAU;AAAA,MAAA,CACX;AAAA,IAAA;AAGH,SAAA,kBAAkB,MAAY;AAC5B,UAAI,KAAK,kBAAkB;AACzB,aAAK,iBAAiB,MAAA;AACtB,aAAK,mBAAmB;AAAA,MAAA;AAAA,IAC1B;AAMF,SAAA,SAAS,MAAY;AACnB,WAAK,wBAAA;AACL,WAAK,gBAAA;AAAA,IAAgB;AAMvB,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,+BAAoC;AAAA,IAAA;AAnOnD,SAAK,UAAU;AAAA,MACb,GAAG;AAAA,MACH,GAAG;AAAA,MACH,cAAc,eAAe,gBAAgB,CAAC,eAAe;AAAA,IAAA;AAE/D,SAAK,UAAU,KAAK,QAAQ,gBAAgB,CAAA,CAAE;AAAA,EAAA;AAAA,EAhBhD;AAAA,EACA;AAAA,EACA;AAAA,EAGA;AAAA,EA0BA;AAAA,EAyBA;AAAA,EAOA;AAAA,EAoEA;AAAA,EAsDA;AAAA,EAOA;AAAA,EAOA;AAAA,EAOA;AAAA,EAaA;AAqBF;AA6CO,SAAS,cACd,IACA,gBACA;AACA,QAAM,iBAAiB,IAAI,eAAe,IAAI,cAAc;AAC5D,SAAO,eAAe;AACxB;"}

dist/esm/batcher.d.ts

@@ -17,10 +17,2 @@ import { Store } from '@tanstack/store';
     /**
-     * Whether the batcher is active and will process items automatically
-     */
-    isRunning: boolean;
-    /**
-     * Total number of items that have been processed across all batches
-     */
-    totalItemsProcessed: number;
-    /**
      * Array of items currently queued for batch processing
@@ -37,2 +29,6 @@ */
     status: 'idle' | 'pending';
+    /**
+     * Total number of items that have been processed across all batches
+     */
+    totalItemsProcessed: number;
 }
@@ -137,10 +133,2 @@ /**
     /**
-     * Stops the batcher from processing batches
-     */
-    stop: () => void;
-    /**
-     * Starts the batcher and processes any pending items
-     */
-    start: () => void;
-    /**
      * Returns a copy of all items in the batcher
@@ -147,0 +135,0 @@ */

dist/esm/batcher.js

@@ -8,3 +8,2 @@ import { Store } from "@tanstack/store";
     isPending: false,
-    isRunning: true,
     totalItemsProcessed: 0,
@@ -61,3 +60,3 @@ items: [],
         this.#execute();
-      } else if (this.store.state.isRunning && this.options.wait !== Infinity) {
+      } else if (this.options.wait !== Infinity) {
         this.#clearTimeout();
@@ -85,12 +84,2 @@ this.#timeoutId = setTimeout(() => this.#execute(), this.#getWait());
     };
-    this.stop = () => {
-      this.#setState({ isRunning: false });
-      this.#clearTimeout();
-    };
-    this.start = () => {
-      this.#setState({ isRunning: true });
-      if (this.store.state.items.length > 0) {
-        this.#execute();
-      }
-    };
     this.peekAllItems = () => {
@@ -97,0 +86,0 @@ return [...this.store.state.items];

dist/esm/batcher.js.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"batcher.js","sources":["../../src/batcher.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { OptionalKeys } from './types'\n\nexport interface BatcherState<TValue> {\n  /**\n   * Number of batch executions that have been completed\n   */\n  executionCount: number\n  /**\n   * Whether the batcher has no items to process (items array is empty)\n   */\n  isEmpty: boolean\n  /**\n   * Whether the batcher is waiting for the timeout to trigger batch processing\n   */\n  isPending: boolean\n  /**\n   * Whether the batcher is active and will process items automatically\n   */\n  isRunning: boolean\n  /**\n   * Total number of items that have been processed across all batches\n   */\n  totalItemsProcessed: number\n  /**\n   * Array of items currently queued for batch processing\n   */\n  items: Array<TValue>\n  /**\n   * Number of items currently in the batch queue\n   */\n  size: number\n  /**\n   * Current processing status - 'idle' when not processing, 'pending' when waiting for timeout\n   */\n  status: 'idle' | 'pending'\n}\n\nfunction getDefaultBatcherState<TValue>(): BatcherState<TValue> {\n  return {\n    executionCount: 0,\n    isEmpty: true,\n    isPending: false,\n    isRunning: true,\n    totalItemsProcessed: 0,\n    items: [],\n    size: 0,\n    status: 'idle',\n  }\n}\n\n/**\n * Options for configuring a Batcher instance\n */\nexport interface BatcherOptions<TValue> {\n  /**\n   * Custom function to determine if a batch should be processed\n   * Return true to process the batch immediately\n   */\n  getShouldExecute?: (items: Array<TValue>, batcher: Batcher<TValue>) => boolean\n  /**\n   * Initial state for the batcher\n   */\n  initialState?: Partial<BatcherState<TValue>>\n  /**\n   * Maximum number of items in a batch\n   * @default Infinity\n   */\n  maxSize?: number\n  /**\n   * Callback fired after a batch is processed\n   */\n  onExecute?: (batcher: Batcher<TValue>) => void\n  /**\n   * Callback fired after items are added to the batcher\n   */\n  onItemsChange?: (batcher: Batcher<TValue>) => void\n  /**\n   * Whether the batcher should start processing immediately\n   * @default true\n   */\n  started?: boolean\n  /**\n   * Maximum time in milliseconds to wait before processing a batch.\n   * If the wait duration has elapsed, the batch will be processed.\n   * If not provided, the batch will not be triggered by a timeout.\n   * @default Infinity\n   */\n  wait?: number | ((batcher: Batcher<TValue>) => number)\n}\n\ntype BatcherOptionsWithOptionalCallbacks<TValue> = OptionalKeys<\n  Required<BatcherOptions<TValue>>,\n  'initialState' | 'onExecute' | 'onItemsChange'\n>\n\nconst defaultOptions: BatcherOptionsWithOptionalCallbacks<any> = {\n  getShouldExecute: () => false,\n  maxSize: Infinity,\n  started: true,\n  wait: Infinity,\n}\n\n/**\n * A class that collects items and processes them in batches.\n *\n * Batching is a technique for grouping multiple operations together to be processed as a single unit.\n *\n * The Batcher provides a flexible way to implement batching with configurable:\n * - Maximum batch size (number of items per batch)\n * - Time-based batching (process after X milliseconds)\n * - Custom batch processing logic via getShouldExecute\n * - Event callbacks for monitoring batch operations\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the batcher\n * - Use `onExecute` callback to react to batch execution and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the batcher\n * - The state includes batch execution count, total items processed, items, and running status\n * - State can be accessed via `batcher.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `batcher.state`\n *\n * @example\n * ```ts\n * const batcher = new Batcher<number>(\n *   (items) => console.log('Processing batch:', items),\n *   {\n *     maxSize: 5,\n *     wait: 2000,\n *     onExecute: (batcher) => console.log('Batch executed:', batcher.peekAllItems())\n *   }\n * );\n *\n * batcher.addItem(1);\n * batcher.addItem(2);\n * // After 2 seconds or when 5 items are added, whichever comes first,\n * // the batch will be processed\n * // batcher.flush() // manually trigger a batch\n * ```\n */\nexport class Batcher<TValue> {\n  readonly store: Store<Readonly<BatcherState<TValue>>> = new Store(\n    getDefaultBatcherState<TValue>(),\n  )\n  options: BatcherOptionsWithOptionalCallbacks<TValue>\n  #timeoutId: NodeJS.Timeout | null = null\n\n  constructor(\n    private fn: (items: Array<TValue>) => void,\n    initialOptions: BatcherOptions<TValue>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the batcher options\n   */\n  setOptions = (newOptions: Partial<BatcherOptions<TValue>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<BatcherState<TValue>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const { isPending, items } = combinedState\n      const size = items.length\n      const isEmpty = size === 0\n      return {\n        ...combinedState,\n        isEmpty,\n        size,\n        status: isPending ? 'pending' : 'idle',\n      }\n    })\n  }\n\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait, this)\n  }\n\n  /**\n   * Adds an item to the batcher\n   * If the batch size is reached, timeout occurs, or shouldProcess returns true, the batch will be processed\n   */\n  addItem = (item: TValue): void => {\n    this.#setState({\n      items: [...this.store.state.items, item],\n      isPending: this.options.wait !== Infinity,\n    })\n    this.options.onItemsChange?.(this)\n\n    const shouldProcess =\n      this.store.state.items.length >= this.options.maxSize ||\n      this.options.getShouldExecute(this.store.state.items, this)\n\n    if (shouldProcess) {\n      this.#execute()\n    } else if (this.store.state.isRunning && this.options.wait !== Infinity) {\n      this.#clearTimeout() // clear any pending timeout to replace it with a new one\n      this.#timeoutId = setTimeout(() => this.#execute(), this.#getWait())\n    }\n  }\n\n  /**\n   * Processes the current batch of items.\n   * This method will automatically be triggered if the batcher is running and any of these conditions are met:\n   * - The number of items reaches batchSize\n   * - The wait duration has elapsed\n   * - The getShouldExecute function returns true upon adding an item\n   *\n   * You can also call this method manually to process the current batch at any time.\n   */\n  #execute = (): void => {\n    if (this.store.state.items.length === 0) {\n      return\n    }\n\n    const batch = this.peekAllItems() // copy of the items to be processed (to prevent race conditions)\n    this.clear() // Clear items before processing to prevent race conditions\n    this.options.onItemsChange?.(this) // Call onItemsChange to notify listeners that the items have changed\n\n    this.fn(batch) // EXECUTE\n    this.#setState({\n      executionCount: this.store.state.executionCount + 1,\n      totalItemsProcessed: this.store.state.totalItemsProcessed + batch.length,\n    })\n    this.options.onExecute?.(this)\n  }\n\n  /**\n   * Processes the current batch of items immediately\n   */\n  flush = (): void => {\n    this.#clearTimeout() // clear any pending timeout\n    this.#execute() // execute immediately\n  }\n\n  /**\n   * Stops the batcher from processing batches\n   */\n  stop = (): void => {\n    this.#setState({ isRunning: false })\n    this.#clearTimeout()\n  }\n\n  /**\n   * Starts the batcher and processes any pending items\n   */\n  start = (): void => {\n    this.#setState({ isRunning: true })\n    if (this.store.state.items.length > 0) {\n      this.#execute()\n    }\n  }\n\n  /**\n   * Returns a copy of all items in the batcher\n   */\n  peekAllItems = (): Array<TValue> => {\n    return [...this.store.state.items]\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = null\n    }\n  }\n\n  /**\n   * Removes all items from the batcher\n   */\n  clear = (): void => {\n    this.#setState({ items: [], isPending: false })\n  }\n\n  /**\n   * Resets the batcher state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultBatcherState<TValue>())\n    this.options.onItemsChange?.(this)\n  }\n}\n\n/**\n * Creates a batcher that processes items in batches\n *\n * @example\n * ```ts\n * const batchItems = batch<number>(\n *   (items) => console.log('Processing:', items),\n *   {\n *     maxSize: 3,\n *     onExecute: (batcher) => console.log('Batch executed')\n *   }\n * );\n *\n * batchItems(1);\n * batchItems(2);\n * batchItems(3); 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+{"version":3,"file":"batcher.js","sources":["../../src/batcher.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { OptionalKeys } from './types'\n\nexport interface BatcherState<TValue> {\n  /**\n   * Number of batch executions that have been completed\n   */\n  executionCount: number\n  /**\n   * Whether the batcher has no items to process (items array is empty)\n   */\n  isEmpty: boolean\n  /**\n   * Whether the batcher is waiting for the timeout to trigger batch processing\n   */\n  isPending: boolean\n  /**\n   * Array of items currently queued for batch processing\n   */\n  items: Array<TValue>\n  /**\n   * Number of items currently in the batch queue\n   */\n  size: number\n  /**\n   * Current processing status - 'idle' when not processing, 'pending' when waiting for timeout\n   */\n  status: 'idle' | 'pending'\n  /**\n   * Total number of items that have been processed across all batches\n   */\n  totalItemsProcessed: number\n}\n\nfunction getDefaultBatcherState<TValue>(): BatcherState<TValue> {\n  return {\n    executionCount: 0,\n    isEmpty: true,\n    isPending: false,\n    totalItemsProcessed: 0,\n    items: [],\n    size: 0,\n    status: 'idle',\n  }\n}\n\n/**\n * Options for configuring a Batcher instance\n */\nexport interface BatcherOptions<TValue> {\n  /**\n   * Custom function to determine if a batch should be processed\n   * Return true to process the batch immediately\n   */\n  getShouldExecute?: (items: Array<TValue>, batcher: Batcher<TValue>) => boolean\n  /**\n   * Initial state for the batcher\n   */\n  initialState?: Partial<BatcherState<TValue>>\n  /**\n   * Maximum number of items in a batch\n   * @default Infinity\n   */\n  maxSize?: number\n  /**\n   * Callback fired after a batch is processed\n   */\n  onExecute?: (batcher: Batcher<TValue>) => void\n  /**\n   * Callback fired after items are added to the batcher\n   */\n  onItemsChange?: (batcher: Batcher<TValue>) => void\n  /**\n   * Whether the batcher should start processing immediately\n   * @default true\n   */\n  started?: boolean\n  /**\n   * Maximum time in milliseconds to wait before processing a batch.\n   * If the wait duration has elapsed, the batch will be processed.\n   * If not provided, the batch will not be triggered by a timeout.\n   * @default Infinity\n   */\n  wait?: number | ((batcher: Batcher<TValue>) => number)\n}\n\ntype BatcherOptionsWithOptionalCallbacks<TValue> = OptionalKeys<\n  Required<BatcherOptions<TValue>>,\n  'initialState' | 'onExecute' | 'onItemsChange'\n>\n\nconst defaultOptions: BatcherOptionsWithOptionalCallbacks<any> = {\n  getShouldExecute: () => false,\n  maxSize: Infinity,\n  started: true,\n  wait: Infinity,\n}\n\n/**\n * A class that collects items and processes them in batches.\n *\n * Batching is a technique for grouping multiple operations together to be processed as a single unit.\n *\n * The Batcher provides a flexible way to implement batching with configurable:\n * - Maximum batch size (number of items per batch)\n * - Time-based batching (process after X milliseconds)\n * - Custom batch processing logic via getShouldExecute\n * - Event callbacks for monitoring batch operations\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the batcher\n * - Use `onExecute` callback to react to batch execution and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the batcher\n * - The state includes batch execution count, total items processed, items, and running status\n * - State can be accessed via `batcher.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `batcher.state`\n *\n * @example\n * ```ts\n * const batcher = new Batcher<number>(\n *   (items) => console.log('Processing batch:', items),\n *   {\n *     maxSize: 5,\n *     wait: 2000,\n *     onExecute: (batcher) => console.log('Batch executed:', batcher.peekAllItems())\n *   }\n * );\n *\n * batcher.addItem(1);\n * batcher.addItem(2);\n * // After 2 seconds or when 5 items are added, whichever comes first,\n * // the batch will be processed\n * // batcher.flush() // manually trigger a batch\n * ```\n */\nexport class Batcher<TValue> {\n  readonly store: Store<Readonly<BatcherState<TValue>>> = new Store(\n    getDefaultBatcherState<TValue>(),\n  )\n  options: BatcherOptionsWithOptionalCallbacks<TValue>\n  #timeoutId: NodeJS.Timeout | null = null\n\n  constructor(\n    private fn: (items: Array<TValue>) => void,\n    initialOptions: BatcherOptions<TValue>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the batcher options\n   */\n  setOptions = (newOptions: Partial<BatcherOptions<TValue>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<BatcherState<TValue>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const { isPending, items } = combinedState\n      const size = items.length\n      const isEmpty = size === 0\n      return {\n        ...combinedState,\n        isEmpty,\n        size,\n        status: isPending ? 'pending' : 'idle',\n      }\n    })\n  }\n\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait, this)\n  }\n\n  /**\n   * Adds an item to the batcher\n   * If the batch size is reached, timeout occurs, or shouldProcess returns true, the batch will be processed\n   */\n  addItem = (item: TValue): void => {\n    this.#setState({\n      items: [...this.store.state.items, item],\n      isPending: this.options.wait !== Infinity,\n    })\n    this.options.onItemsChange?.(this)\n\n    const shouldProcess =\n      this.store.state.items.length >= this.options.maxSize ||\n      this.options.getShouldExecute(this.store.state.items, this)\n\n    if (shouldProcess) {\n      this.#execute()\n    } else if (this.options.wait !== Infinity) {\n      this.#clearTimeout() // clear any pending timeout to replace it with a new one\n      this.#timeoutId = setTimeout(() => this.#execute(), this.#getWait())\n    }\n  }\n\n  /**\n   * Processes the current batch of items.\n   * This method will automatically be triggered if the batcher is running and any of these conditions are met:\n   * - The number of items reaches batchSize\n   * - The wait duration has elapsed\n   * - The getShouldExecute function returns true upon adding an item\n   *\n   * You can also call this method manually to process the current batch at any time.\n   */\n  #execute = (): void => {\n    if (this.store.state.items.length === 0) {\n      return\n    }\n\n    const batch = this.peekAllItems() // copy of the items to be processed (to prevent race conditions)\n    this.clear() // Clear items before processing to prevent race conditions\n    this.options.onItemsChange?.(this) // Call onItemsChange to notify listeners that the items have changed\n\n    this.fn(batch) // EXECUTE\n    this.#setState({\n      executionCount: this.store.state.executionCount + 1,\n      totalItemsProcessed: this.store.state.totalItemsProcessed + batch.length,\n    })\n    this.options.onExecute?.(this)\n  }\n\n  /**\n   * Processes the current batch of items immediately\n   */\n  flush = (): void => {\n    this.#clearTimeout() // clear any pending timeout\n    this.#execute() // execute immediately\n  }\n\n  /**\n   * Returns a copy of all items in the batcher\n   */\n  peekAllItems = (): Array<TValue> => {\n    return [...this.store.state.items]\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = null\n    }\n  }\n\n  /**\n   * Removes all items from the batcher\n   */\n  clear = (): void => {\n    this.#setState({ items: [], isPending: false })\n  }\n\n  /**\n   * Resets the batcher state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultBatcherState<TValue>())\n    this.options.onItemsChange?.(this)\n  }\n}\n\n/**\n * Creates a batcher that processes items in batches\n *\n * @example\n * ```ts\n * const batchItems = batch<number>(\n *   (items) => console.log('Processing:', items),\n *   {\n *     maxSize: 3,\n *     onExecute: (batcher) => console.log('Batch executed')\n *   }\n * );\n *\n * batchItems(1);\n * batchItems(2);\n * batchItems(3); // Triggers batch processing\n * ```\n */\nexport function batch<TValue>(\n  fn: (items: Array<TValue>) => void,\n  options: BatcherOptions<TValue>,\n) {\n  const batcher = new Batcher<TValue>(fn, options)\n  return batcher.addItem\n}\n"],"names":["batch"],"mappings":";;AAmCA,SAAS,yBAAuD;AAC9D,SAAO;AAAA,IACL,gBAAgB;AAAA,IAChB,SAAS;AAAA,IACT,WAAW;AAAA,IACX,qBAAqB;AAAA,IACrB,OAAO,CAAA;AAAA,IACP,MAAM;AAAA,IACN,QAAQ;AAAA,EAAA;AAEZ;AA+CA,MAAM,iBAA2D;AAAA,EAC/D,kBAAkB,MAAM;AAAA,EACxB,SAAS;AAAA,EACT,SAAS;AAAA,EACT,MAAM;AACR;AAwCO,MAAM,QAAgB;AAAA,EAO3B,YACU,IACR,gBACA;AAFQ,SAAA,KAAA;AAPV,SAAS,QAA+C,IAAI;AAAA,MAC1D,uBAAA;AAAA,IAA+B;AAGjC,SAAA,aAAoC;AAgBpC,SAAA,aAAa,CAAC,eAAsD;AAClE,WAAK,UAAU,EAAE,GAAG,KAAK,SAAS,GAAG,WAAA;AAAA,IAAW;AAGlD,SAAA,YAAY,CAAC,aAAkD;AAC7D,WAAK,MAAM,SAAS,CAAC,UAAU;AAC7B,cAAM,gBAAgB;AAAA,UACpB,GAAG;AAAA,UACH,GAAG;AAAA,QAAA;AAEL,cAAM,EAAE,WAAW,MAAA,IAAU;AAC7B,cAAM,OAAO,MAAM;AACnB,cAAM,UAAU,SAAS;AACzB,eAAO;AAAA,UACL,GAAG;AAAA,UACH;AAAA,UACA;AAAA,UACA,QAAQ,YAAY,YAAY;AAAA,QAAA;AAAA,MAClC,CACD;AAAA,IAAA;AAGH,SAAA,WAAW,MAAc;AACvB,aAAO,qBAAqB,KAAK,QAAQ,MAAM,IAAI;AAAA,IAAA;AAOrD,SAAA,UAAU,CAAC,SAAuB;AAChC,WAAK,UAAU;AAAA,QACb,OAAO,CAAC,GAAG,KAAK,MAAM,MAAM,OAAO,IAAI;AAAA,QACvC,WAAW,KAAK,QAAQ,SAAS;AAAA,MAAA,CAClC;AACD,WAAK,QAAQ,gBAAgB,IAAI;AAEjC,YAAM,gBACJ,KAAK,MAAM,MAAM,MAAM,UAAU,KAAK,QAAQ,WAC9C,KAAK,QAAQ,iBAAiB,KAAK,MAAM,MAAM,OAAO,IAAI;AAE5D,UAAI,eAAe;AACjB,aAAK,SAAA;AAAA,MAAS,WACL,KAAK,QAAQ,SAAS,UAAU;AACzC,aAAK,cAAA;AACL,aAAK,aAAa,WAAW,MAAM,KAAK,YAAY,KAAK,UAAU;AAAA,MAAA;AAAA,IACrE;AAYF,SAAA,WAAW,MAAY;AACrB,UAAI,KAAK,MAAM,MAAM,MAAM,WAAW,GAAG;AACvC;AAAA,MAAA;AAGF,YAAMA,SAAQ,KAAK,aAAA;AACnB,WAAK,MAAA;AACL,WAAK,QAAQ,gBAAgB,IAAI;AAEjC,WAAK,GAAGA,MAAK;AACb,WAAK,UAAU;AAAA,QACb,gBAAgB,KAAK,MAAM,MAAM,iBAAiB;AAAA,QAClD,qBAAqB,KAAK,MAAM,MAAM,sBAAsBA,OAAM;AAAA,MAAA,CACnE;AACD,WAAK,QAAQ,YAAY,IAAI;AAAA,IAAA;AAM/B,SAAA,QAAQ,MAAY;AAClB,WAAK,cAAA;AACL,WAAK,SAAA;AAAA,IAAS;AAMhB,SAAA,eAAe,MAAqB;AAClC,aAAO,CAAC,GAAG,KAAK,MAAM,MAAM,KAAK;AAAA,IAAA;AAGnC,SAAA,gBAAgB,MAAY;AAC1B,UAAI,KAAK,YAAY;AACnB,qBAAa,KAAK,UAAU;AAC5B,aAAK,aAAa;AAAA,MAAA;AAAA,IACpB;AAMF,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,EAAE,OAAO,CAAA,GAAI,WAAW,OAAO;AAAA,IAAA;AAMhD,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,wBAAgC;AAC/C,WAAK,QAAQ,gBAAgB,IAAI;AAAA,IAAA;AAvHjC,SAAK,UAAU;AAAA,MACb,GAAG;AAAA,MACH,GAAG;AAAA,IAAA;AAEL,SAAK,UAAU,KAAK,QAAQ,gBAAgB,CAAA,CAAE;AAAA,EAAA;AAAA,EAVhD;AAAA,EAoBA;AAAA,EAkBA;AAAA,EAoCA;AAAA,EAgCA;AAqBF;AAoBO,SAAS,MACd,IACA,SACA;AACA,QAAM,UAAU,IAAI,QAAgB,IAAI,OAAO;AAC/C,SAAO,QAAQ;AACjB;"}

dist/esm/queuer.d.ts

@@ -28,2 +28,6 @@ import { Store } from '@tanstack/store';
     /**
+     * Array of items currently waiting to be processed
+     */
+    items: Array<TValue>;
+    /**
      * Timestamps when items were added to the queue for expiration tracking
@@ -33,6 +37,2 @@ */
     /**
-     * Array of items currently waiting to be processed
-     */
-    items: Array<TValue>;
-    /**
      * Whether the queuer has a pending timeout for processing the next item
@@ -98,2 +98,6 @@ */
     /**
+     * Callback fired whenever an item is removed from the queuer
+     */
+    onExecute?: (item: TValue, queuer: Queuer<TValue>) => void;
+    /**
      * Callback fired whenever an item expires in the queuer
@@ -103,6 +107,2 @@ */
     /**
-     * Callback fired whenever an item is removed from the queuer
-     */
-    onExecute?: (item: TValue, queuer: Queuer<TValue>) => void;
-    /**
      * Callback fired whenever an item is added or removed from the queuer
@@ -258,2 +258,7 @@ */
     /**
+     * Processes all items in the queue as a batch using the provided function
+     * The queue is cleared after processing
+     */
+    flushAsBatch: (batchFunction: (items: Array<TValue>) => void) => void;
+    /**
      * Returns the next item in the queue without removing it.
@@ -260,0 +265,0 @@ *

dist/esm/queuer.js

@@ -156,2 +156,7 @@ import { Store } from "@tanstack/store";
     };
+    this.#getAllItems = () => {
+      const items = this.peekAllItems();
+      this.clear();
+      return items;
+    };
     this.execute = (position) => {
@@ -175,2 +180,7 @@ const item = this.getNextItem(position);
     };
+    this.flushAsBatch = (batchFunction) => {
+      const items = this.#getAllItems();
+      this.clear();
+      batchFunction(items);
+    };
     this.#checkExpiredItems = () => {
@@ -270,2 +280,3 @@ if ((this.options.expirationDuration ?? Infinity) === Infinity && this.options.getIsExpired === defaultOptions.getIsExpired) {
   #tick;
+  #getAllItems;
   #checkExpiredItems;
@@ -272,0 +283,0 @@ #clearTimeout;

dist/esm/queuer.js.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"queuer.js","sources":["../../src/queuer.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\n\nexport interface QueuerState<TValue> {\n  /**\n   * Number of items that have been processed by the queuer\n   */\n  executionCount: number\n  /**\n   * Number of items that have been removed from the queue due to expiration\n   */\n  expirationCount: number\n  /**\n   * Whether the queuer has no items to process (items array is empty)\n   */\n  isEmpty: boolean\n  /**\n   * Whether the queuer has reached its maximum capacity\n   */\n  isFull: boolean\n  /**\n   * Whether the queuer is not currently processing any items\n   */\n  isIdle: boolean\n  /**\n   * Whether the queuer is active and will process items automatically\n   */\n  isRunning: boolean\n  /**\n   * Timestamps when items were added to the queue for expiration tracking\n   */\n  itemTimestamps: Array<number>\n  /**\n   * Array of items currently waiting to be processed\n   */\n  items: Array<TValue>\n  /**\n   * Whether the queuer has a pending timeout for processing the next item\n   */\n  pendingTick: boolean\n  /**\n   * Number of items that have been rejected from being added to the queue\n   */\n  rejectionCount: number\n  /**\n   * Number of items currently in the queue\n   */\n  size: number\n  /**\n   * Current processing status - 'idle' when not processing, 'running' when active, 'stopped' when paused\n   */\n  status: 'idle' | 'running' | 'stopped'\n}\n\nfunction getDefaultQueuerState<TValue>(): QueuerState<TValue> {\n  return {\n    executionCount: 0,\n    expirationCount: 0,\n    isEmpty: true,\n    isFull: false,\n    isIdle: true,\n    isRunning: true,\n    itemTimestamps: [],\n    items: [],\n    pendingTick: false,\n    rejectionCount: 0,\n    size: 0,\n    status: 'idle',\n  }\n}\n\n/**\n * Options for configuring a Queuer instance.\n *\n * These options control queue behavior, item expiration, callbacks, and more.\n */\nexport interface QueuerOptions<TValue> {\n  /**\n   * Default position to add items to the queuer\n   * @default 'back'\n   */\n  addItemsTo?: QueuePosition\n  /**\n   * Maximum time in milliseconds that an item can stay in the queue\n   * If not provided, items will never expire\n   */\n  expirationDuration?: number\n  /**\n   * Function to determine if an item has expired\n   * If provided, this overrides the expirationDuration behavior\n   */\n  getIsExpired?: (item: TValue, addedAt: number) => boolean\n  /**\n   * Default position to get items from during processing\n   * @default 'front'\n   */\n  getItemsFrom?: QueuePosition\n  /**\n   * Function to determine priority of items in the queuer\n   * Higher priority items will be processed first\n   */\n  getPriority?: (item: TValue) => number\n  /**\n   * Initial items to populate the queuer with\n   */\n  initialItems?: Array<TValue>\n  /**\n   * Initial state for the queuer\n   */\n  initialState?: Partial<QueuerState<TValue>>\n  /**\n   * Maximum number of items allowed in the queuer\n   */\n  maxSize?: number\n  /**\n   * Callback fired whenever an item expires in the queuer\n   */\n  onExpire?: (item: TValue, queuer: Queuer<TValue>) => void\n  /**\n   * Callback fired whenever an item is removed from the queuer\n   */\n  onExecute?: (item: TValue, queuer: Queuer<TValue>) => void\n  /**\n   * Callback fired whenever an item is added or removed from the queuer\n   */\n  onItemsChange?: (queuer: Queuer<TValue>) => void\n  /**\n   * Callback fired whenever an item is rejected from being added to the queuer\n   */\n  onReject?: (item: TValue, queuer: Queuer<TValue>) => void\n  /**\n   * Whether the queuer should start processing tasks immediately\n   */\n  started?: boolean\n  /**\n   * Time in milliseconds to wait between processing items.\n   * Can be a number or a function that returns a number.\n   * @default 0\n   */\n  wait?: number | ((queuer: Queuer<TValue>) => number)\n}\n\nconst defaultOptions: Omit<\n  Required<QueuerOptions<any>>,\n  | 'initialState'\n  | 'onExecute'\n  | 'onIsRunningChange'\n  | 'onItemsChange'\n  | 'onReject'\n  | 'onExpire'\n> = {\n  addItemsTo: 'back',\n  getItemsFrom: 'front',\n  getPriority: (item) => item?.priority ?? 0,\n  getIsExpired: () => false,\n  expirationDuration: Infinity,\n  initialItems: [],\n  maxSize: Infinity,\n  started: true,\n  wait: 0,\n}\n\n/**\n * Position type for addItem and getNextItem operations.\n *\n * - 'front': Operate on the front of the queue (FIFO)\n * - 'back': Operate on the back of the queue (LIFO)\n */\nexport type QueuePosition = 'front' | 'back'\n\n/**\n * A flexible queue that processes items with configurable wait times, expiration, and priority.\n *\n * Features:\n * - Automatic or manual processing of items\n * - FIFO (First In First Out), LIFO (Last In First Out), or double-ended queue behavior\n * - Priority-based ordering when getPriority is provided\n * - Item expiration and removal of stale items\n * - Callbacks for queue state changes, execution, rejection, and expiration\n *\n * Running behavior:\n * - `start()`: Begins automatically processing items in the queue (defaults to isRunning)\n * - `stop()`: Pauses processing but maintains queue state\n * - `wait`: Configurable delay between processing items\n * - `onItemsChange`/`onExecute`: Callbacks for monitoring queue state\n *\n * Manual processing is also supported when automatic processing is disabled:\n * - `execute()`: Processes the next item using the provided function\n * - `getNextItem()`: Removes and returns the next item without processing\n *\n * Queue behavior defaults to FIFO:\n * - `addItem(item)`: Adds to the back of the queue\n * - Items processed from the front of the queue\n *\n * Priority queue:\n * - Provide a `getPriority` function; higher values are processed first\n *\n * Stack (LIFO):\n * - `addItem(item, 'back')`: Adds to the back\n * - `getNextItem('back')`: Removes from the back\n *\n * Double-ended queue:\n * - `addItem(item, position)`: Adds to specified position ('front'/'back')\n * - `getNextItem(position)`: Removes from specified position\n *\n * Item expiration:\n * - `expirationDuration`: Maximum time items can stay in the queue\n * - `getIsExpired`: Function to override default expiration\n * - `onExpire`: Callback for expired items\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the queuer\n * - Use `onExecute` callback to react to item execution and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the queue\n * - Use `onExpire` callback to react to items expiring and implement custom logic\n * - Use `onReject` callback to react to items being rejected when the queue is full\n * - The state includes execution count, expiration count, rejection count, and isRunning status\n * - State can be accessed via `queuer.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `queuer.state`\n *\n * Example usage:\n * ```ts\n * // Auto-processing queue with wait time\n * const autoQueue = new Queuer<number>((n) => console.log(n), {\n *   started: true, // Begin processing immediately\n *   wait: 1000, // Wait 1s between items\n *   onExecute: (item) => console.log(`Processed ${item}`)\n * });\n * autoQueue.addItem(1); // Will process after 1s\n * autoQueue.addItem(2); // Will process 1s after first item\n *\n * // Manual processing queue\n * const manualQueue = new Queuer<number>((n) => console.log(n), {\n *   started: false\n * });\n * manualQueue.addItem(1); // [1]\n * manualQueue.addItem(2); // [1, 2]\n * manualQueue.execute(); // logs 1, queue is [2]\n * manualQueue.getNextItem(); // returns 2, queue is empty\n * ```\n */\nexport class Queuer<TValue> {\n  readonly store: Store<Readonly<QueuerState<TValue>>> = new Store(\n    getDefaultQueuerState<TValue>(),\n  )\n  options: QueuerOptions<TValue>\n  #timeoutId: NodeJS.Timeout | null = null\n\n  constructor(\n    private fn: (item: TValue) => void,\n    initialOptions: QueuerOptions<TValue> = {},\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n    }\n    const isInitiallyRunning =\n      this.options.initialState?.isRunning ?? this.options.started ?? true\n    this.#setState({\n      ...this.options.initialState,\n      isRunning: isInitiallyRunning,\n    })\n\n    if (this.options.initialState?.items) {\n      if (this.store.state.isRunning) {\n        this.#tick()\n      }\n    } else {\n      for (let i = 0; i < (this.options.initialItems?.length ?? 0); i++) {\n        const item = this.options.initialItems![i]!\n        const isLast = i === (this.options.initialItems?.length ?? 0) - 1\n        this.addItem(item, this.options.addItemsTo ?? 'back', isLast)\n      }\n    }\n  }\n\n  /**\n   * Updates the queuer options. New options are merged with existing options.\n   */\n  setOptions = (newOptions: Partial<QueuerOptions<TValue>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<QueuerState<TValue>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n\n      const { items, isRunning } = combinedState\n\n      const size = items.length\n      const isFull = size >= (this.options.maxSize ?? Infinity)\n      const isEmpty = size === 0\n      const isIdle = isRunning && isEmpty\n\n      const status = isIdle ? 'idle' : isRunning ? 'running' : 'stopped'\n\n      return {\n        ...combinedState,\n        isEmpty,\n        isFull,\n        isIdle,\n        size,\n        status,\n      }\n    })\n  }\n\n  /**\n   * Returns the current wait time (in milliseconds) between processing items.\n   * If a function is provided, it is called with the queuer instance.\n   */\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait ?? 0, this)\n  }\n\n  /**\n   * Processes items in the queue up to the wait interval. Internal use only.\n   */\n  #tick = () => {\n    if (!this.store.state.isRunning) {\n      this.#setState({ pendingTick: false })\n      return\n    }\n\n    this.#setState({ pendingTick: true })\n\n    // Check for expired items\n    this.#checkExpiredItems()\n\n    while (this.store.state.items.length > 0) {\n      const nextItem = this.execute(this.options.getItemsFrom ?? 'front')\n      if (nextItem === undefined) {\n        break\n      }\n\n      const wait = this.#getWait()\n      if (wait > 0) {\n        // Use setTimeout to wait before processing next item\n        this.#timeoutId = setTimeout(() => this.#tick(), wait)\n        return\n      }\n\n      this.#tick()\n    }\n    this.#setState({ pendingTick: false })\n  }\n\n  /**\n   * Adds an item to the queue. If the queue is full, the item is rejected and onReject is called.\n   * Items can be inserted based on priority or at the front/back depending on configuration.\n   *\n   * Returns true if the item was added, false if the queue is full.\n   *\n   * Example usage:\n   * ```ts\n   * queuer.addItem('task');\n   * queuer.addItem('task2', 'front');\n   * ```\n   */\n  addItem = (\n    item: TValue,\n    position: QueuePosition = this.options.addItemsTo ?? 'back',\n    runOnItemsChange: boolean = true,\n  ): boolean => {\n    if (this.store.state.items.length >= (this.options.maxSize ?? Infinity)) {\n      this.#setState({\n        rejectionCount: this.store.state.rejectionCount + 1,\n      })\n      this.options.onReject?.(item, this)\n      return false\n    }\n\n    // Get priority either from the function or from getPriority option\n    const priority =\n      this.options.getPriority !== defaultOptions.getPriority\n        ? this.options.getPriority!(item)\n        : (item as any).priority\n\n    const items = this.store.state.items\n    const itemTimestamps = this.store.state.itemTimestamps\n\n    if (priority !== undefined) {\n      // Insert based on priority - higher priority items go to front\n      const insertIndex = items.findIndex((existing) => {\n        const existingPriority: number =\n          this.options.getPriority !== defaultOptions.getPriority\n            ? this.options.getPriority!(existing)\n            : (existing as any).priority\n        return existingPriority < priority\n      })\n\n      if (insertIndex === -1) {\n        items.push(item)\n        itemTimestamps.push(Date.now())\n      } else {\n        items.splice(insertIndex, 0, item)\n        itemTimestamps.splice(insertIndex, 0, Date.now())\n      }\n    } else {\n      if (position === 'front') {\n        // Default FIFO/LIFO behavior\n        items.unshift(item)\n        itemTimestamps.unshift(Date.now())\n      } else {\n        // LIFO\n        items.push(item)\n        itemTimestamps.push(Date.now())\n      }\n    }\n\n    this.#setState({\n      items,\n      itemTimestamps,\n    })\n\n    if (runOnItemsChange) {\n      this.options.onItemsChange?.(this)\n    }\n\n    if (this.store.state.isRunning && !this.store.state.pendingTick) {\n      this.#setState({ pendingTick: true })\n      this.#tick()\n    }\n\n    return true\n  }\n\n  /**\n   * Removes and returns the next item from the queue without executing the function.\n   * Use for manual queue management. 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Infinity)\n\n      if (isExpired) {\n        expiredIndices.push(i)\n      }\n    }\n\n    // Remove expired items from back to front to maintain indices\n    for (let i = expiredIndices.length - 1; i >= 0; i--) {\n      const index = expiredIndices[i]\n      if (index === undefined) continue\n\n      const expiredItem = this.store.state.items[index]\n      if (expiredItem === undefined) continue\n\n      const newItems = [...this.store.state.items]\n      const newTimestamps = [...this.store.state.itemTimestamps]\n      newItems.splice(index, 1)\n      newTimestamps.splice(index, 1)\n      this.#setState({\n        items: newItems,\n        itemTimestamps: newTimestamps,\n        expirationCount: this.store.state.expirationCount + 1,\n      })\n      this.options.onExpire?.(expiredItem, this)\n    }\n\n    if (expiredIndices.length > 0) {\n      this.options.onItemsChange?.(this)\n    }\n  }\n\n  /**\n   * Returns the next item in the queue without removing it.\n   *\n   * Example usage:\n   * ```ts\n   * queuer.peekNextItem(); // front\n   * queuer.peekNextItem('back'); // back\n   * ```\n   */\n  peekNextItem = (position: QueuePosition = 'front'): TValue | undefined => {\n    if (position === 'front') {\n      return this.store.state.items[0]\n    }\n    return this.store.state.items[this.store.state.items.length - 1]\n  }\n\n  /**\n   * Returns a copy of all items in the queue.\n   */\n  peekAllItems = (): Array<TValue> => {\n    return [...this.store.state.items]\n  }\n\n  /**\n   * Starts processing items in the queue. If already isRunning, does nothing.\n   */\n  start = () => {\n    this.#setState({ isRunning: true })\n    if (!this.store.state.pendingTick && this.store.state.items.length > 0) {\n      this.#tick()\n    }\n  }\n\n  /**\n   * Stops processing items in the queue. Does not clear the queue.\n   */\n  stop = () => {\n    this.#clearTimeout()\n    this.#setState({ isRunning: false, pendingTick: false })\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = null\n    }\n  }\n\n  /**\n   * Removes all pending items from the queue. Does not affect items being processed.\n   */\n  clear = (): void => {\n    this.#setState({ items: [], itemTimestamps: [] })\n    this.options.onItemsChange?.(this)\n  }\n\n  /**\n   * Resets the queuer state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultQueuerState<TValue>())\n    this.options.onItemsChange?.(this)\n  }\n}\n\n/**\n * Creates a queue that processes items immediately upon addition.\n * Items are processed sequentially in FIFO order by default.\n *\n * This is a simplified wrapper around the Queuer class that only exposes the\n * `addItem` method. The queue is always isRunning and will process items as they are added.\n * For more control over queue processing, use the Queuer class directly.\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the queuer\n * - Use `onExecute` callback to react to item execution and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the queue\n * - Use `onExpire` callback to react to items expiring and implement custom logic\n * - Use `onReject` callback to react to items being rejected when the queue is full\n * - The state includes execution count, expiration count, rejection count, and isRunning status\n * - State can be accessed via the underlying Queuer instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * Example usage:\n * ```ts\n * // Basic sequential processing\n * const processItems = queue<number>((n) => console.log(n), {\n *   wait: 1000,\n *   onItemsChange: (queuer) => console.log(queuer.peekAllItems())\n * });\n * processItems(1); // Logs: 1\n * processItems(2); // Logs: 2 after 1 completes\n *\n * // Priority queue\n * const processPriority = queue<number>((n) => console.log(n), {\n *   getPriority: n => n // Higher numbers processed first\n * });\n * processPriority(1);\n * processPriority(3); // Processed before 1\n * ```\n */\nexport function queue<TValue>(\n  fn: (item: TValue) => void,\n  initialOptions: QueuerOptions<TValue>,\n) {\n  const queuer = new Queuer<TValue>(fn, initialOptions)\n  return 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+{"version":3,"file":"queuer.js","sources":["../../src/queuer.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\n\nexport interface QueuerState<TValue> {\n  /**\n   * Number of items that have been processed by the queuer\n   */\n  executionCount: number\n  /**\n   * Number of items that have been removed from the queue due to expiration\n   */\n  expirationCount: number\n  /**\n   * Whether the queuer has no items to process (items array is empty)\n   */\n  isEmpty: boolean\n  /**\n   * Whether the queuer has reached its maximum capacity\n   */\n  isFull: boolean\n  /**\n   * Whether the queuer is not currently processing any items\n   */\n  isIdle: boolean\n  /**\n   * Whether the queuer is active and will process items automatically\n   */\n  isRunning: boolean\n  /**\n   * Array of items currently waiting to be processed\n   */\n  items: Array<TValue>\n  /**\n   * Timestamps when items were added to the queue for expiration tracking\n   */\n  itemTimestamps: Array<number>\n  /**\n   * Whether the queuer has a pending timeout for processing the next item\n   */\n  pendingTick: boolean\n  /**\n   * Number of items that have been rejected from being added to the queue\n   */\n  rejectionCount: number\n  /**\n   * Number of items currently in the queue\n   */\n  size: number\n  /**\n   * Current processing status - 'idle' when not processing, 'running' when active, 'stopped' when paused\n   */\n  status: 'idle' | 'running' | 'stopped'\n}\n\nfunction getDefaultQueuerState<TValue>(): QueuerState<TValue> {\n  return {\n    executionCount: 0,\n    expirationCount: 0,\n    isEmpty: true,\n    isFull: false,\n    isIdle: true,\n    isRunning: true,\n    itemTimestamps: [],\n    items: [],\n    pendingTick: false,\n    rejectionCount: 0,\n    size: 0,\n    status: 'idle',\n  }\n}\n\n/**\n * Options for configuring a Queuer instance.\n *\n * These options control queue behavior, item expiration, callbacks, and more.\n */\nexport interface QueuerOptions<TValue> {\n  /**\n   * Default position to add items to the queuer\n   * @default 'back'\n   */\n  addItemsTo?: QueuePosition\n  /**\n   * Maximum time in milliseconds that an item can stay in the queue\n   * If not provided, items will never expire\n   */\n  expirationDuration?: number\n  /**\n   * Function to determine if an item has expired\n   * If provided, this overrides the expirationDuration behavior\n   */\n  getIsExpired?: (item: TValue, addedAt: number) => boolean\n  /**\n   * Default position to get items from during processing\n   * @default 'front'\n   */\n  getItemsFrom?: QueuePosition\n  /**\n   * Function to determine priority of items in the queuer\n   * Higher priority items will be processed first\n   */\n  getPriority?: (item: TValue) => number\n  /**\n   * Initial items to populate the queuer with\n   */\n  initialItems?: Array<TValue>\n  /**\n   * Initial state for the queuer\n   */\n  initialState?: Partial<QueuerState<TValue>>\n  /**\n   * Maximum number of items allowed in the queuer\n   */\n  maxSize?: number\n  /**\n   * Callback fired whenever an item is removed from the queuer\n   */\n  onExecute?: (item: TValue, queuer: Queuer<TValue>) => void\n  /**\n   * Callback fired whenever an item expires in the queuer\n   */\n  onExpire?: (item: TValue, queuer: Queuer<TValue>) => void\n  /**\n   * Callback fired whenever an item is added or removed from the queuer\n   */\n  onItemsChange?: (queuer: Queuer<TValue>) => void\n  /**\n   * Callback fired whenever an item is rejected from being added to the queuer\n   */\n  onReject?: (item: TValue, queuer: Queuer<TValue>) => void\n  /**\n   * Whether the queuer should start processing tasks immediately\n   */\n  started?: boolean\n  /**\n   * Time in milliseconds to wait between processing items.\n   * Can be a number or a function that returns a number.\n   * @default 0\n   */\n  wait?: number | ((queuer: Queuer<TValue>) => number)\n}\n\nconst defaultOptions: Omit<\n  Required<QueuerOptions<any>>,\n  | 'initialState'\n  | 'onExecute'\n  | 'onIsRunningChange'\n  | 'onItemsChange'\n  | 'onReject'\n  | 'onExpire'\n> = {\n  addItemsTo: 'back',\n  getItemsFrom: 'front',\n  getPriority: (item) => item?.priority ?? 0,\n  getIsExpired: () => false,\n  expirationDuration: Infinity,\n  initialItems: [],\n  maxSize: Infinity,\n  started: true,\n  wait: 0,\n}\n\n/**\n * Position type for addItem and getNextItem operations.\n *\n * - 'front': Operate on the front of the queue (FIFO)\n * - 'back': Operate on the back of the queue (LIFO)\n */\nexport type QueuePosition = 'front' | 'back'\n\n/**\n * A flexible queue that processes items with configurable wait times, expiration, and priority.\n *\n * Features:\n * - Automatic or manual processing of items\n * - FIFO (First In First Out), LIFO (Last In First Out), or double-ended queue behavior\n * - Priority-based ordering when getPriority is provided\n * - Item expiration and removal of stale items\n * - Callbacks for queue state changes, execution, rejection, and expiration\n *\n * Running behavior:\n * - `start()`: Begins automatically processing items in the queue (defaults to isRunning)\n * - `stop()`: Pauses processing but maintains queue state\n * - `wait`: Configurable delay between processing items\n * - `onItemsChange`/`onExecute`: Callbacks for monitoring queue state\n *\n * Manual processing is also supported when automatic processing is disabled:\n * - `execute()`: Processes the next item using the provided function\n * - `getNextItem()`: Removes and returns the next item without processing\n *\n * Queue behavior defaults to FIFO:\n * - `addItem(item)`: Adds to the back of the queue\n * - Items processed from the front of the queue\n *\n * Priority queue:\n * - Provide a `getPriority` function; higher values are processed first\n *\n * Stack (LIFO):\n * - `addItem(item, 'back')`: Adds to the back\n * - `getNextItem('back')`: Removes from the back\n *\n * Double-ended queue:\n * - `addItem(item, position)`: Adds to specified position ('front'/'back')\n * - `getNextItem(position)`: Removes from specified position\n *\n * Item expiration:\n * - `expirationDuration`: Maximum time items can stay in the queue\n * - `getIsExpired`: Function to override default expiration\n * - `onExpire`: Callback for expired items\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the queuer\n * - Use `onExecute` callback to react to item execution and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the queue\n * - Use `onExpire` callback to react to items expiring and implement custom logic\n * - Use `onReject` callback to react to items being rejected when the queue is full\n * - The state includes execution count, expiration count, rejection count, and isRunning status\n * - State can be accessed via `queuer.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `queuer.state`\n *\n * Example usage:\n * ```ts\n * // Auto-processing queue with wait time\n * const autoQueue = new Queuer<number>((n) => console.log(n), {\n *   started: true, // Begin processing immediately\n *   wait: 1000, // Wait 1s between items\n *   onExecute: (item) => console.log(`Processed ${item}`)\n * });\n * autoQueue.addItem(1); // Will process after 1s\n * autoQueue.addItem(2); // Will process 1s after first item\n *\n * // Manual processing queue\n * const manualQueue = new Queuer<number>((n) => console.log(n), {\n *   started: false\n * });\n * manualQueue.addItem(1); // [1]\n * manualQueue.addItem(2); // [1, 2]\n * manualQueue.execute(); // logs 1, queue is [2]\n * manualQueue.getNextItem(); // returns 2, queue is empty\n * ```\n */\nexport class Queuer<TValue> {\n  readonly store: Store<Readonly<QueuerState<TValue>>> = new Store(\n    getDefaultQueuerState<TValue>(),\n  )\n  options: QueuerOptions<TValue>\n  #timeoutId: NodeJS.Timeout | null = null\n\n  constructor(\n    private fn: (item: TValue) => void,\n    initialOptions: QueuerOptions<TValue> = {},\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n    }\n    const isInitiallyRunning =\n      this.options.initialState?.isRunning ?? this.options.started ?? true\n    this.#setState({\n      ...this.options.initialState,\n      isRunning: isInitiallyRunning,\n    })\n\n    if (this.options.initialState?.items) {\n      if (this.store.state.isRunning) {\n        this.#tick()\n      }\n    } else {\n      for (let i = 0; i < (this.options.initialItems?.length ?? 0); i++) {\n        const item = this.options.initialItems![i]!\n        const isLast = i === (this.options.initialItems?.length ?? 0) - 1\n        this.addItem(item, this.options.addItemsTo ?? 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Normally, use execute() to process items.\n   *\n   * Example usage:\n   * ```ts\n   * // FIFO\n   * queuer.getNextItem();\n   * // LIFO\n   * queuer.getNextItem('back');\n   * ```\n   */\n  getNextItem = (\n    position: QueuePosition = this.options.getItemsFrom ?? 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Calls onExpire for each expired item.\n   * Internal use only.\n   */\n  #checkExpiredItems = (): void => {\n    if (\n      (this.options.expirationDuration ?? Infinity) === Infinity &&\n      this.options.getIsExpired === defaultOptions.getIsExpired\n    ) {\n      return\n    }\n\n    const now = Date.now()\n    const expiredIndices: Array<number> = []\n\n    // Find indices of expired items\n    for (let i = 0; i < this.store.state.items.length; i++) {\n      const timestamp = this.store.state.itemTimestamps[i]\n      if (timestamp === undefined) continue\n\n      const item = this.store.state.items[i]\n      if (item === undefined) continue\n\n      const isExpired =\n        this.options.getIsExpired !== defaultOptions.getIsExpired\n          ? this.options.getIsExpired!(item, timestamp)\n          : now - timestamp > (this.options.expirationDuration ?? 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If already isRunning, does nothing.\n   */\n  start = () => {\n    this.#setState({ isRunning: true })\n    if (!this.store.state.pendingTick && this.store.state.items.length > 0) {\n      this.#tick()\n    }\n  }\n\n  /**\n   * Stops processing items in the queue. Does not clear the queue.\n   */\n  stop = () => {\n    this.#clearTimeout()\n    this.#setState({ isRunning: false, pendingTick: false })\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = null\n    }\n  }\n\n  /**\n   * Removes all pending items from the queue. Does not affect items being processed.\n   */\n  clear = (): void => {\n    this.#setState({ items: [], itemTimestamps: [] })\n    this.options.onItemsChange?.(this)\n  }\n\n  /**\n   * Resets the queuer state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultQueuerState<TValue>())\n    this.options.onItemsChange?.(this)\n  }\n}\n\n/**\n * Creates a queue that processes items immediately upon addition.\n * Items are processed sequentially in FIFO order by default.\n *\n * This is a simplified wrapper around the Queuer class that only exposes the\n * `addItem` method. The queue is always isRunning and will process items as they are added.\n * For more control over queue processing, use the Queuer class directly.\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the queuer\n * - Use `onExecute` callback to react to item execution and implement custom logic\n * - Use `onItemsChange` callback to react to items being added or removed from the queue\n * - Use `onExpire` callback to react to items expiring and implement custom logic\n * - Use `onReject` callback to react to items being rejected when the queue is full\n * - The state includes execution count, expiration count, rejection count, and isRunning status\n * - State can be accessed via the underlying Queuer instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * Example usage:\n * ```ts\n * // Basic sequential processing\n * const processItems = queue<number>((n) => console.log(n), {\n *   wait: 1000,\n *   onItemsChange: (queuer) => console.log(queuer.peekAllItems())\n * });\n * processItems(1); // Logs: 1\n * processItems(2); // Logs: 2 after 1 completes\n *\n * // Priority queue\n * const processPriority = queue<number>((n) => console.log(n), {\n *   getPriority: n => n // Higher numbers processed first\n * });\n * processPriority(1);\n * processPriority(3); // Processed before 1\n * ```\n */\nexport function queue<TValue>(\n  fn: (item: TValue) => void,\n  initialOptions: QueuerOptions<TValue>,\n) {\n  const queuer = new Queuer<TValue>(fn, initialOptions)\n  return 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dist/esm/rate-limiter.d.ts

@@ -13,5 +13,13 @@ import { Store } from '@tanstack/store';
     /**
+     * Whether the rate limiter has exceeded the limit
+     */
+    isExceeded: boolean;
+    /**
      * Number of function executions that have been rejected due to rate limiting
      */
     rejectionCount: number;
+    /**
+     * Current execution status - 'disabled' when not active, 'executing' when executing, 'idle' when not executing, 'exceeded' when rate limit is exceeded
+     */
+    status: 'disabled' | 'exceeded' | 'idle';
 }
@@ -18,0 +26,0 @@ /**

dist/esm/rate-limiter.js

@@ -7,3 +7,5 @@ import { Store } from "@tanstack/store";
     executionTimes: [],
-    rejectionCount: 0
+    isExceeded: false,
+    rejectionCount: 0,
+    status: "idle"
   });
@@ -21,2 +23,3 @@ }
     this.store = new Store(getDefaultRateLimiterState());
+    this.#timeoutIds = /* @__PURE__ */ new Set();
     this.setOptions = (newOptions) => {
@@ -31,3 +34,9 @@ this.options = { ...this.options, ...newOptions };
         };
-        return combinedState;
+        const isExceeded = combinedState.executionTimes.length >= this.#getLimit();
+        const status = !this.#getEnabled() ? "disabled" : isExceeded ? "exceeded" : "idle";
+        return {
+          ...combinedState,
+          isExceeded,
+          status
+        };
       });
@@ -46,3 +55,3 @@ };
       this.#cleanupOldExecutions();
-      const relevantExecutionTimes = this.#getRelevantExecutionTimes();
+      const relevantExecutionTimes = this.#getExecutionTimesInWindow();
       if (relevantExecutionTimes.length < this.#getLimit()) {
@@ -63,2 +72,3 @@ this.#execute(...args);
       this.store.state.executionTimes.push(now);
+      this.#setCleanupTimeout(now);
       this.#setState({
@@ -69,3 +79,3 @@ executionCount: this.store.state.executionCount + 1
     };
-    this.#getRelevantExecutionTimes = () => {
+    this.#getExecutionTimesInWindow = () => {
       if (this.options.windowType === "sliding") {
@@ -76,20 +86,43 @@ return this.store.state.executionTimes.filter(
       } else {
+        if (this.store.state.executionTimes.length === 0) {
+          return [];
+        }
         const oldestExecution = Math.min(...this.store.state.executionTimes);
         const windowStart = oldestExecution;
+        const windowEnd = windowStart + this.#getWindow();
+        const now = Date.now();
+        if (now > windowEnd) {
+          return [];
+        }
         return this.store.state.executionTimes.filter(
-          (time) => time >= windowStart && time <= windowStart + this.#getWindow()
+          (time) => time >= windowStart && time <= windowEnd
         );
       }
     };
+    this.#setCleanupTimeout = (executionTime) => {
+      if (this.options.windowType === "sliding" || this.#timeoutIds.size === 0) {
+        const now = Date.now();
+        const timeUntilExpiration = executionTime - now + this.#getWindow() + 1;
+        const timeoutId = setTimeout(() => {
+          this.#cleanupOldExecutions();
+          this.#clearTimeout(timeoutId);
+        }, timeUntilExpiration);
+        this.#timeoutIds.add(timeoutId);
+      }
+    };
+    this.#clearTimeout = (timeoutId) => {
+      clearTimeout(timeoutId);
+      this.#timeoutIds.delete(timeoutId);
+    };
+    this.#clearTimeouts = () => {
+      this.#timeoutIds.forEach((timeoutId) => clearTimeout(timeoutId));
+      this.#timeoutIds.clear();
+    };
     this.#cleanupOldExecutions = () => {
-      const now = Date.now();
-      const windowStart = now - this.#getWindow();
       this.#setState({
-        executionTimes: this.store.state.executionTimes.filter(
-          (time) => time > windowStart
-        )
+        executionTimes: this.#getExecutionTimesInWindow()
       });
     };
     this.getRemainingInWindow = () => {
-      const relevantExecutionTimes = this.#getRelevantExecutionTimes();
+      const relevantExecutionTimes = this.#getExecutionTimesInWindow();
       return Math.max(0, this.#getLimit() - relevantExecutionTimes.length);
@@ -106,2 +139,3 @@ };
       this.#setState(getDefaultRateLimiterState());
+      this.#clearTimeouts();
     };
@@ -113,3 +147,7 @@ this.options = {
     this.#setState(this.options.initialState ?? {});
+    for (const executionTime of this.#getExecutionTimesInWindow()) {
+      this.#setCleanupTimeout(executionTime);
+    }
   }
+  #timeoutIds;
   #setState;
@@ -120,3 +158,6 @@ #getEnabled;
   #execute;
-  #getRelevantExecutionTimes;
+  #getExecutionTimesInWindow;
+  #setCleanupTimeout;
+  #clearTimeout;
+  #clearTimeouts;
   #cleanupOldExecutions;
@@ -123,0 +164,0 @@ }

dist/esm/rate-limiter.js.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"rate-limiter.js","sources":["../../src/rate-limiter.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { AnyFunction } from './types'\n\nexport interface RateLimiterState {\n  /**\n   * Number of function executions that have been completed\n   */\n  executionCount: number\n  /**\n   * Array of timestamps when executions occurred for rate limiting calculations\n   */\n  executionTimes: Array<number>\n  /**\n   * Number of function executions that have been rejected due to rate limiting\n   */\n  rejectionCount: number\n}\n\nfunction getDefaultRateLimiterState(): RateLimiterState {\n  return structuredClone({\n    executionCount: 0,\n    executionTimes: [],\n    rejectionCount: 0,\n  })\n}\n\n/**\n * Options for configuring a rate-limited function\n */\nexport interface RateLimiterOptions<TFn extends AnyFunction> {\n  /**\n   * Whether the rate limiter is enabled. When disabled, maybeExecute will not trigger any executions.\n   * Defaults to true.\n   */\n  enabled?: boolean | ((rateLimiter: RateLimiter<TFn>) => boolean)\n  /**\n   * Initial state for the rate limiter\n   */\n  initialState?: Partial<RateLimiterState>\n  /**\n   * Maximum number of executions allowed within the time window.\n   * Can be a number or a callback function that receives the rate limiter instance and returns a number.\n   */\n  limit: number | ((rateLimiter: RateLimiter<TFn>) => number)\n  /**\n   * Callback function that is called after the function is executed\n   */\n  onExecute?: (rateLimiter: RateLimiter<TFn>) => void\n  /**\n   * Optional callback function that is called when an execution is rejected due to rate limiting\n   */\n  onReject?: (rateLimiter: RateLimiter<TFn>) => void\n  /**\n   * Time window in milliseconds within which the limit applies.\n   * Can be a number or a callback function that receives the rate limiter instance and returns a number.\n   */\n  window: number | ((rateLimiter: RateLimiter<TFn>) => number)\n  /**\n   * Type of window to use for rate limiting\n   * - 'fixed': Uses a fixed window that resets after the window period\n   * - 'sliding': Uses a sliding window that allows executions as old ones expire\n   * Defaults to 'fixed'\n   */\n  windowType?: 'fixed' | 'sliding'\n}\n\nconst defaultOptions: Omit<\n  Required<RateLimiterOptions<any>>,\n  'initialState' | 'onExecute' | 'onReject'\n> = {\n  enabled: true,\n  limit: 1,\n  window: 0,\n  windowType: 'fixed',\n}\n\n/**\n * A class that creates a rate-limited function.\n *\n * Rate limiting is a simple approach that allows a function to execute up to a limit within a time window,\n * then blocks all subsequent calls until the window passes. This can lead to \"bursty\" behavior where\n * all executions happen immediately, followed by a complete block.\n *\n * The rate limiter supports two types of windows:\n * - 'fixed': A strict window that resets after the window period. All executions within the window count\n *   towards the limit, and the window resets completely after the period.\n * - 'sliding': A rolling window that allows executions as old ones expire. This provides a more\n *   consistent rate of execution over time.\n *\n * For smoother execution patterns, consider using:\n * - Throttling: Ensures consistent spacing between executions (e.g. max once per 200ms)\n * - Debouncing: Waits for a pause in calls before executing (e.g. after 500ms of no calls)\n *\n * Rate limiting is best used for hard API limits or resource constraints. For UI updates or\n * smoothing out frequent events, throttling or debouncing usually provide better user experience.\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the rate limiter\n * - Use `onExecute` callback to react to function execution and implement custom logic\n * - Use `onReject` callback to react to executions being rejected when rate limit is exceeded\n * - The state includes execution count, execution times, and rejection count\n * - State can be accessed via `rateLimiter.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `rateLimiter.state`\n *\n * @example\n * ```ts\n * const rateLimiter = new RateLimiter(\n *   (id: string) => api.getData(id),\n *   {\n *     limit: 5,\n *     window: 1000,\n *     windowType: 'sliding',\n *   }\n * );\n *\n * // Will execute immediately until limit reached, then block\n * rateLimiter.maybeExecute('123');\n * ```\n */\nexport class RateLimiter<TFn extends AnyFunction> {\n  readonly store: Store<Readonly<RateLimiterState>> =\n    new Store<RateLimiterState>(getDefaultRateLimiterState())\n  options: RateLimiterOptions<TFn>\n\n  constructor(\n    private fn: TFn,\n    initialOptions: RateLimiterOptions<TFn>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the rate limiter options\n   */\n  setOptions = (newOptions: Partial<RateLimiterOptions<TFn>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<RateLimiterState>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      return combinedState\n    })\n  }\n\n  /**\n   * Returns the current enabled state of the rate limiter\n   */\n  #getEnabled = (): boolean => {\n    return !!parseFunctionOrValue(this.options.enabled, this)\n  }\n\n  /**\n   * Returns the current limit of executions allowed within the time window\n   */\n  #getLimit = (): number => {\n    return parseFunctionOrValue(this.options.limit, this)\n  }\n\n  /**\n   * Returns the current time window in milliseconds\n   */\n  #getWindow = (): number => {\n    return parseFunctionOrValue(this.options.window, this)\n  }\n\n  /**\n   * Attempts to execute the rate-limited function if within the configured limits.\n   * Will reject execution if the number of calls in the current window exceeds the limit.\n   *\n   * @example\n   * ```ts\n   * const rateLimiter = new RateLimiter(fn, { limit: 5, window: 1000 });\n   *\n   * // First 5 calls will return true\n   * rateLimiter.maybeExecute('arg1', 'arg2'); // true\n   *\n   * // Additional calls within the window will return false\n   * rateLimiter.maybeExecute('arg1', 'arg2'); // false\n   * ```\n   */\n  maybeExecute = (...args: Parameters<TFn>): boolean => {\n    this.#cleanupOldExecutions()\n\n    const relevantExecutionTimes = this.#getRelevantExecutionTimes()\n\n    if (relevantExecutionTimes.length < this.#getLimit()) {\n      this.#execute(...args)\n      return true\n    }\n\n    this.#setState({\n      rejectionCount: this.store.state.rejectionCount + 1,\n    })\n    this.options.onReject?.(this)\n    return false\n  }\n\n  #execute = (...args: Parameters<TFn>): void => {\n    if (!this.#getEnabled()) return\n    const now = Date.now()\n    this.fn(...args) // EXECUTE!\n    this.store.state.executionTimes.push(now) // mutate state directly for performance\n    this.#setState({\n      executionCount: this.store.state.executionCount + 1,\n    })\n    this.options.onExecute?.(this)\n  }\n\n  #getRelevantExecutionTimes = (): Array<number> => {\n    if (this.options.windowType === 'sliding') {\n      // For sliding window, return all executions within the current window\n      return this.store.state.executionTimes.filter(\n        (time) => time > Date.now() - this.#getWindow(),\n      )\n    } else {\n      // For fixed window, return all executions in the current window\n      // The window starts from the oldest execution time\n      const oldestExecution = Math.min(...this.store.state.executionTimes)\n      const windowStart = oldestExecution\n      return this.store.state.executionTimes.filter(\n        (time) =>\n          time >= windowStart && time <= windowStart + this.#getWindow(),\n      )\n    }\n  }\n\n  #cleanupOldExecutions = (): void => {\n    const now = Date.now()\n    const windowStart = now - this.#getWindow()\n    this.#setState({\n      executionTimes: this.store.state.executionTimes.filter(\n        (time) => time > windowStart,\n      ),\n    })\n  }\n\n  /**\n   * Returns the number of remaining executions allowed in the current window\n   */\n  getRemainingInWindow = (): number => {\n    const relevantExecutionTimes = this.#getRelevantExecutionTimes()\n    return Math.max(0, this.#getLimit() - relevantExecutionTimes.length)\n  }\n\n  /**\n   * Returns the number of milliseconds until the next execution will be possible\n   */\n  getMsUntilNextWindow = (): number => {\n    if (this.getRemainingInWindow() > 0) {\n      return 0\n    }\n    const oldestExecution = this.store.state.executionTimes[0] ?? Infinity\n    return oldestExecution + this.#getWindow() - Date.now()\n  }\n\n  /**\n   * Resets the rate limiter state\n   */\n  reset = (): void => {\n    this.#setState(getDefaultRateLimiterState())\n  }\n}\n\n/**\n * Creates a rate-limited function that will execute the provided function up to a maximum number of times within a time window.\n *\n * Note that rate limiting is a simpler form of execution control compared to throttling or debouncing:\n * - A rate limiter will allow all executions until the limit is reached, then block all subsequent calls until the window resets\n * - A throttler ensures even spacing between executions, which can be better for consistent performance\n * - A debouncer collapses multiple calls into one, which is better for handling bursts of events\n *\n * The rate limiter supports two types of windows:\n * - 'fixed': A strict window that resets after the window period. All executions within the window count\n *   towards the limit, and the window resets completely after the period.\n * - 'sliding': A rolling window that allows executions as old ones expire. This provides a more\n *   consistent rate of execution over time.\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the rate limiter\n * - Use `onExecute` callback to react to function execution and implement custom logic\n * - Use `onReject` callback to react to executions being rejected when rate limit is exceeded\n * - The state includes execution count, execution times, and rejection count\n * - State can be accessed via the underlying RateLimiter instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * Consider using throttle() or debounce() if you need more intelligent execution control. Use rate limiting when you specifically\n * need to enforce a hard limit on the number of executions within a time period.\n *\n * @example\n * ```ts\n * // Rate limit to 5 calls per minute with a sliding window\n * const rateLimited = rateLimit(makeApiCall, {\n *   limit: 5,\n *   window: 60000,\n *   windowType: 'sliding',\n *   onReject: (rateLimiter) => {\n *     console.log(`Rate limit exceeded. Try again in ${rateLimiter.getMsUntilNextWindow()}ms`);\n *   }\n * });\n *\n * // First 5 calls will execute immediately\n * // Additional calls will be rejected until the minute window resets\n * rateLimited();\n *\n * // For more even execution, consider using throttle instead:\n * const throttled = throttle(makeApiCall, { wait: 12000 }); // One call every 12 seconds\n * ```\n */\nexport function rateLimit<TFn extends AnyFunction>(\n  fn: TFn,\n  initialOptions: RateLimiterOptions<TFn>,\n) {\n  const rateLimiter = new RateLimiter(fn, initialOptions)\n  return rateLimiter.maybeExecute\n}\n"],"names":[],"mappings":";;AAmBA,SAAS,6BAA+C;AACtD,SAAO,gBAAgB;AAAA,IACrB,gBAAgB;AAAA,IAChB,gBAAgB,CAAA;AAAA,IAChB,gBAAgB;AAAA,EAAA,CACjB;AACH;AA0CA,MAAM,iBAGF;AAAA,EACF,SAAS;AAAA,EACT,OAAO;AAAA,EACP,QAAQ;AAAA,EACR,YAAY;AACd;AA8CO,MAAM,YAAqC;AAAA,EAKhD,YACU,IACR,gBACA;AAFQ,SAAA,KAAA;AALV,SAAS,QACP,IAAI,MAAwB,2BAAA,CAA4B;AAiB1D,SAAA,aAAa,CAAC,eAAuD;AACnE,WAAK,UAAU,EAAE,GAAG,KAAK,SAAS,GAAG,WAAA;AAAA,IAAW;AAGlD,SAAA,YAAY,CAAC,aAA8C;AACzD,WAAK,MAAM,SAAS,CAAC,UAAU;AAC7B,cAAM,gBAAgB;AAAA,UACpB,GAAG;AAAA,UACH,GAAG;AAAA,QAAA;AAEL,eAAO;AAAA,MAAA,CACR;AAAA,IAAA;AAMH,SAAA,cAAc,MAAe;AAC3B,aAAO,CAAC,CAAC,qBAAqB,KAAK,QAAQ,SAAS,IAAI;AAAA,IAAA;AAM1D,SAAA,YAAY,MAAc;AACxB,aAAO,qBAAqB,KAAK,QAAQ,OAAO,IAAI;AAAA,IAAA;AAMtD,SAAA,aAAa,MAAc;AACzB,aAAO,qBAAqB,KAAK,QAAQ,QAAQ,IAAI;AAAA,IAAA;AAkBvD,SAAA,eAAe,IAAI,SAAmC;AACpD,WAAK,sBAAA;AAEL,YAAM,yBAAyB,KAAK,2BAAA;AAEpC,UAAI,uBAAuB,SAAS,KAAK,UAAA,GAAa;AACpD,aAAK,SAAS,GAAG,IAAI;AACrB,eAAO;AAAA,MAAA;AAGT,WAAK,UAAU;AAAA,QACb,gBAAgB,KAAK,MAAM,MAAM,iBAAiB;AAAA,MAAA,CACnD;AACD,WAAK,QAAQ,WAAW,IAAI;AAC5B,aAAO;AAAA,IAAA;AAGT,SAAA,WAAW,IAAI,SAAgC;AAC7C,UAAI,CAAC,KAAK,cAAe;AACzB,YAAM,MAAM,KAAK,IAAA;AACjB,WAAK,GAAG,GAAG,IAAI;AACf,WAAK,MAAM,MAAM,eAAe,KAAK,GAAG;AACxC,WAAK,UAAU;AAAA,QACb,gBAAgB,KAAK,MAAM,MAAM,iBAAiB;AAAA,MAAA,CACnD;AACD,WAAK,QAAQ,YAAY,IAAI;AAAA,IAAA;AAG/B,SAAA,6BAA6B,MAAqB;AAChD,UAAI,KAAK,QAAQ,eAAe,WAAW;AAEzC,eAAO,KAAK,MAAM,MAAM,eAAe;AAAA,UACrC,CAAC,SAAS,OAAO,KAAK,IAAA,IAAQ,KAAK,WAAA;AAAA,QAAW;AAAA,MAChD,OACK;AAGL,cAAM,kBAAkB,KAAK,IAAI,GAAG,KAAK,MAAM,MAAM,cAAc;AACnE,cAAM,cAAc;AACpB,eAAO,KAAK,MAAM,MAAM,eAAe;AAAA,UACrC,CAAC,SACC,QAAQ,eAAe,QAAQ,cAAc,KAAK,WAAA;AAAA,QAAW;AAAA,MACjE;AAAA,IACF;AAGF,SAAA,wBAAwB,MAAY;AAClC,YAAM,MAAM,KAAK,IAAA;AACjB,YAAM,cAAc,MAAM,KAAK,WAAA;AAC/B,WAAK,UAAU;AAAA,QACb,gBAAgB,KAAK,MAAM,MAAM,eAAe;AAAA,UAC9C,CAAC,SAAS,OAAO;AAAA,QAAA;AAAA,MACnB,CACD;AAAA,IAAA;AAMH,SAAA,uBAAuB,MAAc;AACnC,YAAM,yBAAyB,KAAK,2BAAA;AACpC,aAAO,KAAK,IAAI,GAAG,KAAK,UAAA,IAAc,uBAAuB,MAAM;AAAA,IAAA;AAMrE,SAAA,uBAAuB,MAAc;AACnC,UAAI,KAAK,qBAAA,IAAyB,GAAG;AACnC,eAAO;AAAA,MAAA;AAET,YAAM,kBAAkB,KAAK,MAAM,MAAM,eAAe,CAAC,KAAK;AAC9D,aAAO,kBAAkB,KAAK,WAAA,IAAe,KAAK,IAAA;AAAA,IAAI;AAMxD,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,4BAA4B;AAAA,IAAA;AA3I3C,SAAK,UAAU;AAAA,MACb,GAAG;AAAA,MACH,GAAG;AAAA,IAAA;AAEL,SAAK,UAAU,KAAK,QAAQ,gBAAgB,CAAA,CAAE;AAAA,EAAA;AAAA,EAUhD;AAAA,EAaA;AAAA,EAOA;AAAA,EAOA;AAAA,EAoCA;AAAA,EAWA;AAAA,EAkBA;AAmCF;AAgDO,SAAS,UACd,IACA,gBACA;AACA,QAAM,cAAc,IAAI,YAAY,IAAI,cAAc;AACtD,SAAO,YAAY;AACrB;"}
+{"version":3,"file":"rate-limiter.js","sources":["../../src/rate-limiter.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { AnyFunction } from './types'\n\nexport interface RateLimiterState {\n  /**\n   * Number of function executions that have been completed\n   */\n  executionCount: number\n  /**\n   * Array of timestamps when executions occurred for rate limiting calculations\n   */\n  executionTimes: Array<number>\n  /**\n   * Whether the rate limiter has exceeded the limit\n   */\n  isExceeded: boolean\n  /**\n   * Number of function executions that have been rejected due to rate limiting\n   */\n  rejectionCount: number\n  /**\n   * Current execution status - 'disabled' when not active, 'executing' when executing, 'idle' when not executing, 'exceeded' when rate limit is exceeded\n   */\n  status: 'disabled' | 'exceeded' | 'idle'\n}\n\nfunction getDefaultRateLimiterState(): RateLimiterState {\n  return structuredClone({\n    executionCount: 0,\n    executionTimes: [],\n    isExceeded: false,\n    rejectionCount: 0,\n    status: 'idle',\n  })\n}\n\n/**\n * Options for configuring a rate-limited function\n */\nexport interface RateLimiterOptions<TFn extends AnyFunction> {\n  /**\n   * Whether the rate limiter is enabled. When disabled, maybeExecute will not trigger any executions.\n   * Defaults to true.\n   */\n  enabled?: boolean | ((rateLimiter: RateLimiter<TFn>) => boolean)\n  /**\n   * Initial state for the rate limiter\n   */\n  initialState?: Partial<RateLimiterState>\n  /**\n   * Maximum number of executions allowed within the time window.\n   * Can be a number or a callback function that receives the rate limiter instance and returns a number.\n   */\n  limit: number | ((rateLimiter: RateLimiter<TFn>) => number)\n  /**\n   * Callback function that is called after the function is executed\n   */\n  onExecute?: (rateLimiter: RateLimiter<TFn>) => void\n  /**\n   * Optional callback function that is called when an execution is rejected due to rate limiting\n   */\n  onReject?: (rateLimiter: RateLimiter<TFn>) => void\n  /**\n   * Time window in milliseconds within which the limit applies.\n   * Can be a number or a callback function that receives the rate limiter instance and returns a number.\n   */\n  window: number | ((rateLimiter: RateLimiter<TFn>) => number)\n  /**\n   * Type of window to use for rate limiting\n   * - 'fixed': Uses a fixed window that resets after the window period\n   * - 'sliding': Uses a sliding window that allows executions as old ones expire\n   * Defaults to 'fixed'\n   */\n  windowType?: 'fixed' | 'sliding'\n}\n\nconst defaultOptions: Omit<\n  Required<RateLimiterOptions<any>>,\n  'initialState' | 'onExecute' | 'onReject'\n> = {\n  enabled: true,\n  limit: 1,\n  window: 0,\n  windowType: 'fixed',\n}\n\n/**\n * A class that creates a rate-limited function.\n *\n * Rate limiting is a simple approach that allows a function to execute up to a limit within a time window,\n * then blocks all subsequent calls until the window passes. This can lead to \"bursty\" behavior where\n * all executions happen immediately, followed by a complete block.\n *\n * The rate limiter supports two types of windows:\n * - 'fixed': A strict window that resets after the window period. All executions within the window count\n *   towards the limit, and the window resets completely after the period.\n * - 'sliding': A rolling window that allows executions as old ones expire. This provides a more\n *   consistent rate of execution over time.\n *\n * For smoother execution patterns, consider using:\n * - Throttling: Ensures consistent spacing between executions (e.g. max once per 200ms)\n * - Debouncing: Waits for a pause in calls before executing (e.g. after 500ms of no calls)\n *\n * Rate limiting is best used for hard API limits or resource constraints. For UI updates or\n * smoothing out frequent events, throttling or debouncing usually provide better user experience.\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the rate limiter\n * - Use `onExecute` callback to react to function execution and implement custom logic\n * - Use `onReject` callback to react to executions being rejected when rate limit is exceeded\n * - The state includes execution count, execution times, and rejection count\n * - State can be accessed via `rateLimiter.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `rateLimiter.state`\n *\n * @example\n * ```ts\n * const rateLimiter = new RateLimiter(\n *   (id: string) => api.getData(id),\n *   {\n *     limit: 5,\n *     window: 1000,\n *     windowType: 'sliding',\n *   }\n * );\n *\n * // Will execute immediately until limit reached, then block\n * rateLimiter.maybeExecute('123');\n * ```\n */\nexport class RateLimiter<TFn extends AnyFunction> {\n  readonly store: Store<Readonly<RateLimiterState>> =\n    new Store<RateLimiterState>(getDefaultRateLimiterState())\n  options: RateLimiterOptions<TFn>\n  #timeoutIds: Set<NodeJS.Timeout> = new Set()\n\n  constructor(\n    private fn: TFn,\n    initialOptions: RateLimiterOptions<TFn>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n    }\n    this.#setState(this.options.initialState ?? {})\n    for (const executionTime of this.#getExecutionTimesInWindow()) {\n      this.#setCleanupTimeout(executionTime)\n    }\n  }\n\n  /**\n   * Updates the rate limiter options\n   */\n  setOptions = (newOptions: Partial<RateLimiterOptions<TFn>>): void => {\n    this.options = { ...this.options, ...newOptions }\n  }\n\n  #setState = (newState: Partial<RateLimiterState>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const isExceeded = combinedState.executionTimes.length >= this.#getLimit()\n      const status = !this.#getEnabled()\n        ? 'disabled'\n        : isExceeded\n          ? 'exceeded'\n          : 'idle'\n      return {\n        ...combinedState,\n        isExceeded,\n        status,\n      }\n    })\n  }\n\n  /**\n   * Returns the current enabled state of the rate limiter\n   */\n  #getEnabled = (): boolean => {\n    return !!parseFunctionOrValue(this.options.enabled, this)\n  }\n\n  /**\n   * Returns the current limit of executions allowed within the time window\n   */\n  #getLimit = (): number => {\n    return parseFunctionOrValue(this.options.limit, this)\n  }\n\n  /**\n   * Returns the current time window in milliseconds\n   */\n  #getWindow = (): number => {\n    return parseFunctionOrValue(this.options.window, this)\n  }\n\n  /**\n   * Attempts to execute the rate-limited function if within the configured limits.\n   * Will reject execution if the number of calls in the current window exceeds the limit.\n   *\n   * @example\n   * ```ts\n   * const rateLimiter = new RateLimiter(fn, { limit: 5, window: 1000 });\n   *\n   * // First 5 calls will return true\n   * rateLimiter.maybeExecute('arg1', 'arg2'); // true\n   *\n   * // Additional calls within the window will return false\n   * rateLimiter.maybeExecute('arg1', 'arg2'); // false\n   * ```\n   */\n  maybeExecute = (...args: Parameters<TFn>): boolean => {\n    this.#cleanupOldExecutions()\n\n    const relevantExecutionTimes = this.#getExecutionTimesInWindow()\n\n    if (relevantExecutionTimes.length < this.#getLimit()) {\n      this.#execute(...args)\n      return true\n    }\n\n    this.#setState({\n      rejectionCount: this.store.state.rejectionCount + 1,\n    })\n    this.options.onReject?.(this)\n    return false\n  }\n\n  #execute = (...args: Parameters<TFn>): void => {\n    if (!this.#getEnabled()) return\n    const now = Date.now()\n    this.fn(...args) // EXECUTE!\n    this.store.state.executionTimes.push(now) // mutate state directly for performance\n\n    this.#setCleanupTimeout(now)\n\n    this.#setState({\n      executionCount: this.store.state.executionCount + 1,\n    })\n    this.options.onExecute?.(this)\n  }\n\n  #getExecutionTimesInWindow = (): Array<number> => {\n    if (this.options.windowType === 'sliding') {\n      // For sliding window, return all executions within the current window\n      return this.store.state.executionTimes.filter(\n        (time) => time > Date.now() - this.#getWindow(),\n      )\n    } else {\n      // For fixed window, return all executions in the current window\n      // The window starts from the oldest execution time\n      if (this.store.state.executionTimes.length === 0) {\n        return []\n      }\n      const oldestExecution = Math.min(...this.store.state.executionTimes)\n      const windowStart = oldestExecution\n      const windowEnd = windowStart + this.#getWindow()\n      const now = Date.now()\n\n      // If the window has expired, return empty array\n      if (now > windowEnd) {\n        return []\n      }\n\n      // Otherwise, return all executions in the current window\n      return this.store.state.executionTimes.filter(\n        (time) => time >= windowStart && time <= windowEnd,\n      )\n    }\n  }\n\n  #setCleanupTimeout = (executionTime: number): void => {\n    if (\n      this.options.windowType === 'sliding' ||\n      this.#timeoutIds.size === 0 // new fixed window\n    ) {\n      const now = Date.now()\n      const timeUntilExpiration = executionTime - now + this.#getWindow() + 1\n      const timeoutId = setTimeout(() => {\n        this.#cleanupOldExecutions()\n        this.#clearTimeout(timeoutId)\n      }, timeUntilExpiration)\n      this.#timeoutIds.add(timeoutId)\n    }\n  }\n\n  #clearTimeout = (timeoutId: NodeJS.Timeout): void => {\n    clearTimeout(timeoutId)\n    this.#timeoutIds.delete(timeoutId)\n  }\n\n  #clearTimeouts = (): void => {\n    this.#timeoutIds.forEach((timeoutId) => clearTimeout(timeoutId))\n    this.#timeoutIds.clear()\n  }\n\n  #cleanupOldExecutions = (): void => {\n    this.#setState({\n      executionTimes: this.#getExecutionTimesInWindow(),\n    })\n  }\n\n  /**\n   * Returns the number of remaining executions allowed in the current window\n   */\n  getRemainingInWindow = (): number => {\n    const relevantExecutionTimes = this.#getExecutionTimesInWindow()\n    return Math.max(0, this.#getLimit() - relevantExecutionTimes.length)\n  }\n\n  /**\n   * Returns the number of milliseconds until the next execution will be possible\n   */\n  getMsUntilNextWindow = (): number => {\n    if (this.getRemainingInWindow() > 0) {\n      return 0\n    }\n    const oldestExecution = this.store.state.executionTimes[0] ?? Infinity\n    return oldestExecution + this.#getWindow() - Date.now()\n  }\n\n  /**\n   * Resets the rate limiter state\n   */\n  reset = (): void => {\n    this.#setState(getDefaultRateLimiterState())\n    this.#clearTimeouts()\n  }\n}\n\n/**\n * Creates a rate-limited function that will execute the provided function up to a maximum number of times within a time window.\n *\n * Note that rate limiting is a simpler form of execution control compared to throttling or debouncing:\n * - A rate limiter will allow all executions until the limit is reached, then block all subsequent calls until the window resets\n * - A throttler ensures even spacing between executions, which can be better for consistent performance\n * - A debouncer collapses multiple calls into one, which is better for handling bursts of events\n *\n * The rate limiter supports two types of windows:\n * - 'fixed': A strict window that resets after the window period. All executions within the window count\n *   towards the limit, and the window resets completely after the period.\n * - 'sliding': A rolling window that allows executions as old ones expire. This provides a more\n *   consistent rate of execution over time.\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the rate limiter\n * - Use `onExecute` callback to react to function execution and implement custom logic\n * - Use `onReject` callback to react to executions being rejected when rate limit is exceeded\n * - The state includes execution count, execution times, and rejection count\n * - State can be accessed via the underlying RateLimiter instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * Consider using throttle() or debounce() if you need more intelligent execution control. Use rate limiting when you specifically\n * need to enforce a hard limit on the number of executions within a time period.\n *\n * @example\n * ```ts\n * // Rate limit to 5 calls per minute with a sliding window\n * const rateLimited = rateLimit(makeApiCall, {\n *   limit: 5,\n *   window: 60000,\n *   windowType: 'sliding',\n *   onReject: (rateLimiter) => {\n *     console.log(`Rate limit exceeded. Try again in ${rateLimiter.getMsUntilNextWindow()}ms`);\n *   }\n * });\n *\n * // First 5 calls will execute immediately\n * // Additional calls will be rejected until the minute window resets\n * rateLimited();\n *\n * // For more even execution, consider using throttle instead:\n * const throttled = throttle(makeApiCall, { wait: 12000 }); // One call every 12 seconds\n * ```\n */\nexport function rateLimit<TFn extends AnyFunction>(\n  fn: TFn,\n  initialOptions: RateLimiterOptions<TFn>,\n) {\n  const rateLimiter = new RateLimiter(fn, initialOptions)\n  return rateLimiter.maybeExecute\n}\n"],"names":[],"mappings":";;AA2BA,SAAS,6BAA+C;AACtD,SAAO,gBAAgB;AAAA,IACrB,gBAAgB;AAAA,IAChB,gBAAgB,CAAA;AAAA,IAChB,YAAY;AAAA,IACZ,gBAAgB;AAAA,IAChB,QAAQ;AAAA,EAAA,CACT;AACH;AA0CA,MAAM,iBAGF;AAAA,EACF,SAAS;AAAA,EACT,OAAO;AAAA,EACP,QAAQ;AAAA,EACR,YAAY;AACd;AA8CO,MAAM,YAAqC;AAAA,EAMhD,YACU,IACR,gBACA;AAFQ,SAAA,KAAA;AANV,SAAS,QACP,IAAI,MAAwB,2BAAA,CAA4B;AAE1D,SAAA,kCAAuC,IAAA;AAmBvC,SAAA,aAAa,CAAC,eAAuD;AACnE,WAAK,UAAU,EAAE,GAAG,KAAK,SAAS,GAAG,WAAA;AAAA,IAAW;AAGlD,SAAA,YAAY,CAAC,aAA8C;AACzD,WAAK,MAAM,SAAS,CAAC,UAAU;AAC7B,cAAM,gBAAgB;AAAA,UACpB,GAAG;AAAA,UACH,GAAG;AAAA,QAAA;AAEL,cAAM,aAAa,cAAc,eAAe,UAAU,KAAK,UAAA;AAC/D,cAAM,SAAS,CAAC,KAAK,gBACjB,aACA,aACE,aACA;AACN,eAAO;AAAA,UACL,GAAG;AAAA,UACH;AAAA,UACA;AAAA,QAAA;AAAA,MACF,CACD;AAAA,IAAA;AAMH,SAAA,cAAc,MAAe;AAC3B,aAAO,CAAC,CAAC,qBAAqB,KAAK,QAAQ,SAAS,IAAI;AAAA,IAAA;AAM1D,SAAA,YAAY,MAAc;AACxB,aAAO,qBAAqB,KAAK,QAAQ,OAAO,IAAI;AAAA,IAAA;AAMtD,SAAA,aAAa,MAAc;AACzB,aAAO,qBAAqB,KAAK,QAAQ,QAAQ,IAAI;AAAA,IAAA;AAkBvD,SAAA,eAAe,IAAI,SAAmC;AACpD,WAAK,sBAAA;AAEL,YAAM,yBAAyB,KAAK,2BAAA;AAEpC,UAAI,uBAAuB,SAAS,KAAK,UAAA,GAAa;AACpD,aAAK,SAAS,GAAG,IAAI;AACrB,eAAO;AAAA,MAAA;AAGT,WAAK,UAAU;AAAA,QACb,gBAAgB,KAAK,MAAM,MAAM,iBAAiB;AAAA,MAAA,CACnD;AACD,WAAK,QAAQ,WAAW,IAAI;AAC5B,aAAO;AAAA,IAAA;AAGT,SAAA,WAAW,IAAI,SAAgC;AAC7C,UAAI,CAAC,KAAK,cAAe;AACzB,YAAM,MAAM,KAAK,IAAA;AACjB,WAAK,GAAG,GAAG,IAAI;AACf,WAAK,MAAM,MAAM,eAAe,KAAK,GAAG;AAExC,WAAK,mBAAmB,GAAG;AAE3B,WAAK,UAAU;AAAA,QACb,gBAAgB,KAAK,MAAM,MAAM,iBAAiB;AAAA,MAAA,CACnD;AACD,WAAK,QAAQ,YAAY,IAAI;AAAA,IAAA;AAG/B,SAAA,6BAA6B,MAAqB;AAChD,UAAI,KAAK,QAAQ,eAAe,WAAW;AAEzC,eAAO,KAAK,MAAM,MAAM,eAAe;AAAA,UACrC,CAAC,SAAS,OAAO,KAAK,IAAA,IAAQ,KAAK,WAAA;AAAA,QAAW;AAAA,MAChD,OACK;AAGL,YAAI,KAAK,MAAM,MAAM,eAAe,WAAW,GAAG;AAChD,iBAAO,CAAA;AAAA,QAAC;AAEV,cAAM,kBAAkB,KAAK,IAAI,GAAG,KAAK,MAAM,MAAM,cAAc;AACnE,cAAM,cAAc;AACpB,cAAM,YAAY,cAAc,KAAK,WAAA;AACrC,cAAM,MAAM,KAAK,IAAA;AAGjB,YAAI,MAAM,WAAW;AACnB,iBAAO,CAAA;AAAA,QAAC;AAIV,eAAO,KAAK,MAAM,MAAM,eAAe;AAAA,UACrC,CAAC,SAAS,QAAQ,eAAe,QAAQ;AAAA,QAAA;AAAA,MAC3C;AAAA,IACF;AAGF,SAAA,qBAAqB,CAAC,kBAAgC;AACpD,UACE,KAAK,QAAQ,eAAe,aAC5B,KAAK,YAAY,SAAS,GAC1B;AACA,cAAM,MAAM,KAAK,IAAA;AACjB,cAAM,sBAAsB,gBAAgB,MAAM,KAAK,eAAe;AACtE,cAAM,YAAY,WAAW,MAAM;AACjC,eAAK,sBAAA;AACL,eAAK,cAAc,SAAS;AAAA,QAAA,GAC3B,mBAAmB;AACtB,aAAK,YAAY,IAAI,SAAS;AAAA,MAAA;AAAA,IAChC;AAGF,SAAA,gBAAgB,CAAC,cAAoC;AACnD,mBAAa,SAAS;AACtB,WAAK,YAAY,OAAO,SAAS;AAAA,IAAA;AAGnC,SAAA,iBAAiB,MAAY;AAC3B,WAAK,YAAY,QAAQ,CAAC,cAAc,aAAa,SAAS,CAAC;AAC/D,WAAK,YAAY,MAAA;AAAA,IAAM;AAGzB,SAAA,wBAAwB,MAAY;AAClC,WAAK,UAAU;AAAA,QACb,gBAAgB,KAAK,2BAAA;AAAA,MAA2B,CACjD;AAAA,IAAA;AAMH,SAAA,uBAAuB,MAAc;AACnC,YAAM,yBAAyB,KAAK,2BAAA;AACpC,aAAO,KAAK,IAAI,GAAG,KAAK,UAAA,IAAc,uBAAuB,MAAM;AAAA,IAAA;AAMrE,SAAA,uBAAuB,MAAc;AACnC,UAAI,KAAK,qBAAA,IAAyB,GAAG;AACnC,eAAO;AAAA,MAAA;AAET,YAAM,kBAAkB,KAAK,MAAM,MAAM,eAAe,CAAC,KAAK;AAC9D,aAAO,kBAAkB,KAAK,WAAA,IAAe,KAAK,IAAA;AAAA,IAAI;AAMxD,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,4BAA4B;AAC3C,WAAK,eAAA;AAAA,IAAe;AA5LpB,SAAK,UAAU;AAAA,MACb,GAAG;AAAA,MACH,GAAG;AAAA,IAAA;AAEL,SAAK,UAAU,KAAK,QAAQ,gBAAgB,CAAA,CAAE;AAC9C,eAAW,iBAAiB,KAAK,8BAA8B;AAC7D,WAAK,mBAAmB,aAAa;AAAA,IAAA;AAAA,EACvC;AAAA,EAbF;AAAA,EAuBA;AAAA,EAuBA;AAAA,EAOA;AAAA,EAOA;AAAA,EAoCA;AAAA,EAcA;AAAA,EA6BA;AAAA,EAeA;AAAA,EAKA;AAAA,EAKA;AAgCF;AAgDO,SAAS,UACd,IACA,gBACA;AACA,QAAM,cAAc,IAAI,YAAY,IAAI,cAAc;AACtD,SAAO,YAAY;AACrB;"}

dist/esm/throttler.d.ts

@@ -9,2 +9,6 @@ import { Store } from '@tanstack/store';
     /**
+     * Whether the throttler is waiting for the timeout to trigger execution
+     */
+    isPending: boolean;
+    /**
      * The arguments from the most recent call to maybeExecute
@@ -22,6 +26,2 @@ */
     /**
-     * Whether the throttler is waiting for the timeout to trigger execution
-     */
-    isPending: boolean;
-    /**
      * Current execution status - 'idle' when not active, 'pending' when waiting for timeout
@@ -28,0 +28,0 @@ */

dist/esm/throttler.js.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"throttler.js","sources":["../../src/throttler.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { AnyFunction } from './types'\n\nexport interface ThrottlerState<TFn extends AnyFunction> {\n  /**\n   * Number of function executions that have been completed\n   */\n  executionCount: number\n  /**\n   * The arguments from the most recent call to maybeExecute\n   */\n  lastArgs: Parameters<TFn> | undefined\n  /**\n   * Timestamp of the last function execution in milliseconds\n   */\n  lastExecutionTime: number\n  /**\n   * Timestamp when the next execution can occur in milliseconds\n   */\n  nextExecutionTime: number\n  /**\n   * Whether the throttler is waiting for the timeout to trigger execution\n   */\n  isPending: boolean\n  /**\n   * Current execution status - 'idle' when not active, 'pending' when waiting for timeout\n   */\n  status: 'disabled' | 'idle' | 'pending'\n}\n\nfunction getDefaultThrottlerState<\n  TFn extends AnyFunction,\n>(): ThrottlerState<TFn> {\n  return structuredClone({\n    executionCount: 0,\n    isPending: false,\n    lastArgs: undefined,\n    lastExecutionTime: 0,\n    nextExecutionTime: 0,\n    status: 'idle',\n  })\n}\n\n/**\n * Options for configuring a throttled function\n */\nexport interface ThrottlerOptions<TFn extends AnyFunction> {\n  /**\n   * Whether the throttler is enabled. When disabled, maybeExecute will not trigger any executions.\n   * Can be a boolean or a function that returns a boolean.\n   * Defaults to true.\n   */\n  enabled?: boolean | ((throttler: Throttler<TFn>) => boolean)\n  /**\n   * Initial state for the throttler\n   */\n  initialState?: Partial<ThrottlerState<TFn>>\n  /**\n   * Whether to execute on the leading edge of the timeout.\n   * Defaults to true.\n   */\n  leading?: boolean\n  /**\n   * Callback function that is called after the function is executed\n   */\n  onExecute?: (throttler: Throttler<TFn>) => void\n  /**\n   * Whether to execute on the trailing edge of the timeout.\n   * Defaults to true.\n   */\n  trailing?: boolean\n  /**\n   * Time window in milliseconds during which the function can only be executed once.\n   * Can be a number or a function that returns a number.\n   * Defaults to 0ms\n   */\n  wait: number | ((throttler: Throttler<TFn>) => number)\n}\n\nconst defaultOptions: Omit<\n  Required<ThrottlerOptions<any>>,\n  'initialState' | 'onExecute'\n> = {\n  enabled: true,\n  leading: true,\n  trailing: true,\n  wait: 0,\n}\n\n/**\n * A class that creates a throttled function.\n *\n * Throttling ensures a function is called at most once within a specified time window.\n * Unlike debouncing which waits for a pause in calls, throttling guarantees consistent\n * execution timing regardless of call frequency.\n *\n * Supports both leading and trailing edge execution:\n * - Leading: Execute immediately on first call (default: true)\n * - Trailing: Execute after wait period if called during throttle (default: true)\n *\n * For collapsing rapid-fire events where you only care about the last call, consider using Debouncer.\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the throttler\n * - Use `onExecute` callback to react to function execution and implement custom logic\n * - The state includes execution count, last execution time, pending status, and more\n * - State can be accessed via `throttler.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `throttler.state`\n *\n * @example\n * ```ts\n * const throttler = new Throttler(\n *   (id: string) => api.getData(id),\n *   { wait: 1000 } // Execute at most once per second\n * );\n *\n * // First call executes immediately\n * throttler.maybeExecute('123');\n *\n * // Subsequent calls within 1000ms are throttled\n * throttler.maybeExecute('123'); // Throttled\n * ```\n */\nexport class Throttler<TFn extends AnyFunction> {\n  readonly store: Store<Readonly<ThrottlerState<TFn>>> = new Store(\n    getDefaultThrottlerState(),\n  )\n  options: ThrottlerOptions<TFn>\n  #timeoutId: NodeJS.Timeout | undefined\n\n  constructor(\n    private fn: TFn,\n    initialOptions: ThrottlerOptions<TFn>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the throttler options\n   */\n  setOptions = (newOptions: Partial<ThrottlerOptions<TFn>>): void => {\n    this.options = { ...this.options, ...newOptions }\n\n    // Cancel pending execution if the throttler is disabled\n    if (!this.#getEnabled()) {\n      this.cancel()\n    }\n  }\n\n  #setState = (newState: Partial<ThrottlerState<TFn>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const { isPending } = combinedState\n      return {\n        ...combinedState,\n        status: !this.#getEnabled()\n          ? 'disabled'\n          : isPending\n            ? 'pending'\n            : 'idle',\n      }\n    })\n  }\n\n  #getEnabled = (): boolean => {\n    return !!parseFunctionOrValue(this.options.enabled, this)\n  }\n\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait, this)\n  }\n\n  /**\n   * Attempts to execute the throttled function. The execution behavior depends on the throttler options:\n   *\n   * - If enough time has passed since the last execution (>= wait period):\n   *   - With leading=true: Executes immediately\n   *   - With leading=false: Waits for the next trailing execution\n   *\n   * - If within the wait period:\n   *   - With trailing=true: Schedules execution for end of wait period\n   *   - With trailing=false: Drops the execution\n   *\n   * @example\n   * ```ts\n   * const throttled = new Throttler(fn, { wait: 1000 });\n   *\n   * // First call executes immediately\n   * throttled.maybeExecute('a', 'b');\n   *\n   * // Call during wait period - gets throttled\n   * throttled.maybeExecute('c', 'd');\n   * ```\n   */\n  maybeExecute = (...args: Parameters<TFn>): void => {\n    const now = Date.now()\n    const timeSinceLastExecution = now - this.store.state.lastExecutionTime\n    const wait = this.#getWait()\n\n    // Handle leading execution\n    if (this.options.leading && timeSinceLastExecution >= wait) {\n      this.#execute(...args)\n    } else {\n      // Store the most recent arguments for potential trailing execution\n      this.#setState({\n        lastArgs: args,\n      })\n      // Set up trailing execution if not already scheduled\n      if (!this.#timeoutId && this.options.trailing) {\n        // prevent large number if lastExecutionTime is undefined\n        const _timeSinceLastExecution = this.store.state.lastExecutionTime\n          ? now - this.store.state.lastExecutionTime\n          : 0\n        const timeoutDuration = wait - _timeSinceLastExecution\n        this.#setState({ isPending: true })\n        this.#timeoutId = setTimeout(() => {\n          const { lastArgs } = this.store.state\n          if (lastArgs !== undefined) {\n            this.#execute(...lastArgs)\n          }\n        }, timeoutDuration)\n      }\n    }\n  }\n\n  #execute = (...args: Parameters<TFn>): void => {\n    if (!this.#getEnabled()) return\n    this.fn(...args) // EXECUTE!\n    const lastExecutionTime = Date.now()\n    const nextExecutionTime = lastExecutionTime + this.#getWait()\n    this.#clearTimeout()\n    this.#setState({\n      executionCount: this.store.state.executionCount + 1,\n      lastExecutionTime,\n      nextExecutionTime,\n      isPending: false,\n      lastArgs: undefined,\n    })\n    this.options.onExecute?.(this)\n  }\n\n  /**\n   * Processes the current pending execution immediately\n   */\n  flush = (): void => {\n    if (this.store.state.isPending && this.store.state.lastArgs) {\n      this.#execute(...this.store.state.lastArgs)\n    }\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = undefined\n    }\n  }\n\n  /**\n   * Cancels any pending trailing execution and clears internal state.\n   *\n   * If a trailing execution is scheduled (due to throttling with trailing=true),\n   * this will prevent that execution from occurring. The internal timeout and\n   * stored arguments will be cleared.\n   *\n   * Has no effect if there is no pending execution.\n   */\n  cancel = (): void => {\n    this.#clearTimeout()\n    this.#setState({\n      lastArgs: undefined,\n      isPending: false,\n    })\n  }\n\n  /**\n   * Resets the throttler state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultThrottlerState<TFn>())\n  }\n}\n\n/**\n * Creates a throttled function that limits how often the provided function can execute.\n *\n * Throttling ensures a function executes at most once within a specified time window,\n * regardless of how many times it is called. This is useful for rate-limiting\n * expensive operations or UI updates.\n *\n * The throttled function can be configured to execute on the leading and/or trailing\n * edge of the throttle window via options.\n *\n * For handling bursts of events, consider using debounce() instead. For hard execution\n * limits, consider using rateLimit().\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the throttler\n * - Use `onExecute` callback to react to function execution and implement custom logic\n * - The state includes execution count, last execution time, pending status, and more\n * - State can be accessed via the underlying Throttler instance's `store.state` property\n * - When using framework adapters (React/Solid), state is accessed from the hook's state property\n *\n * @example\n * ```ts\n * // Basic throttling - max once per second\n * const throttled = throttle(updateUI, { wait: 1000 });\n *\n * // Configure leading/trailing execution\n * const throttled = throttle(saveData, {\n *   wait: 2000,\n *   leading: true,  // Execute immediately on first call\n *   trailing: true  // Execute again after delay if called during wait\n * });\n * ```\n */\nexport function throttle<TFn extends AnyFunction>(\n  fn: TFn,\n  initialOptions: ThrottlerOptions<TFn>,\n) {\n  const throttler = new Throttler(fn, initialOptions)\n  return throttler.maybeExecute\n}\n"],"names":[],"mappings":";;AA+BA,SAAS,2BAEgB;AACvB,SAAO,gBAAgB;AAAA,IACrB,gBAAgB;AAAA,IAChB,WAAW;AAAA,IACX,UAAU;AAAA,IACV,mBAAmB;AAAA,IACnB,mBAAmB;AAAA,IACnB,QAAQ;AAAA,EAAA,CACT;AACH;AAsCA,MAAM,iBAGF;AAAA,EACF,SAAS;AAAA,EACT,SAAS;AAAA,EACT,UAAU;AAAA,EACV,MAAM;AACR;AAqCO,MAAM,UAAmC;AAAA,EAO9C,YACU,IACR,gBACA;AAFQ,SAAA,KAAA;AAPV,SAAS,QAA8C,IAAI;AAAA,MACzD,yBAAA;AAAA,IAAyB;AAmB3B,SAAA,aAAa,CAAC,eAAqD;AACjE,WAAK,UAAU,EAAE,GAAG,KAAK,SAAS,GAAG,WAAA;AAGrC,UAAI,CAAC,KAAK,eAAe;AACvB,aAAK,OAAA;AAAA,MAAO;AAAA,IACd;AAGF,SAAA,YAAY,CAAC,aAAiD;AAC5D,WAAK,MAAM,SAAS,CAAC,UAAU;AAC7B,cAAM,gBAAgB;AAAA,UACpB,GAAG;AAAA,UACH,GAAG;AAAA,QAAA;AAEL,cAAM,EAAE,cAAc;AACtB,eAAO;AAAA,UACL,GAAG;AAAA,UACH,QAAQ,CAAC,KAAK,gBACV,aACA,YACE,YACA;AAAA,QAAA;AAAA,MACR,CACD;AAAA,IAAA;AAGH,SAAA,cAAc,MAAe;AAC3B,aAAO,CAAC,CAAC,qBAAqB,KAAK,QAAQ,SAAS,IAAI;AAAA,IAAA;AAG1D,SAAA,WAAW,MAAc;AACvB,aAAO,qBAAqB,KAAK,QAAQ,MAAM,IAAI;AAAA,IAAA;AAyBrD,SAAA,eAAe,IAAI,SAAgC;AACjD,YAAM,MAAM,KAAK,IAAA;AACjB,YAAM,yBAAyB,MAAM,KAAK,MAAM,MAAM;AACtD,YAAM,OAAO,KAAK,SAAA;AAGlB,UAAI,KAAK,QAAQ,WAAW,0BAA0B,MAAM;AAC1D,aAAK,SAAS,GAAG,IAAI;AAAA,MAAA,OAChB;AAEL,aAAK,UAAU;AAAA,UACb,UAAU;AAAA,QAAA,CACX;AAED,YAAI,CAAC,KAAK,cAAc,KAAK,QAAQ,UAAU;AAE7C,gBAAM,0BAA0B,KAAK,MAAM,MAAM,oBAC7C,MAAM,KAAK,MAAM,MAAM,oBACvB;AACJ,gBAAM,kBAAkB,OAAO;AAC/B,eAAK,UAAU,EAAE,WAAW,KAAA,CAAM;AAClC,eAAK,aAAa,WAAW,MAAM;AACjC,kBAAM,EAAE,SAAA,IAAa,KAAK,MAAM;AAChC,gBAAI,aAAa,QAAW;AAC1B,mBAAK,SAAS,GAAG,QAAQ;AAAA,YAAA;AAAA,UAC3B,GACC,eAAe;AAAA,QAAA;AAAA,MACpB;AAAA,IACF;AAGF,SAAA,WAAW,IAAI,SAAgC;AAC7C,UAAI,CAAC,KAAK,cAAe;AACzB,WAAK,GAAG,GAAG,IAAI;AACf,YAAM,oBAAoB,KAAK,IAAA;AAC/B,YAAM,oBAAoB,oBAAoB,KAAK,SAAA;AACnD,WAAK,cAAA;AACL,WAAK,UAAU;AAAA,QACb,gBAAgB,KAAK,MAAM,MAAM,iBAAiB;AAAA,QAClD;AAAA,QACA;AAAA,QACA,WAAW;AAAA,QACX,UAAU;AAAA,MAAA,CACX;AACD,WAAK,QAAQ,YAAY,IAAI;AAAA,IAAA;AAM/B,SAAA,QAAQ,MAAY;AAClB,UAAI,KAAK,MAAM,MAAM,aAAa,KAAK,MAAM,MAAM,UAAU;AAC3D,aAAK,SAAS,GAAG,KAAK,MAAM,MAAM,QAAQ;AAAA,MAAA;AAAA,IAC5C;AAGF,SAAA,gBAAgB,MAAY;AAC1B,UAAI,KAAK,YAAY;AACnB,qBAAa,KAAK,UAAU;AAC5B,aAAK,aAAa;AAAA,MAAA;AAAA,IACpB;AAYF,SAAA,SAAS,MAAY;AACnB,WAAK,cAAA;AACL,WAAK,UAAU;AAAA,QACb,UAAU;AAAA,QACV,WAAW;AAAA,MAAA,CACZ;AAAA,IAAA;AAMH,SAAA,QAAQ,MAAY;AAClB,WAAK,UAAU,0BAA+B;AAAA,IAAA;AAvJ9C,SAAK,UAAU;AAAA,MACb,GAAG;AAAA,MACH,GAAG;AAAA,IAAA;AAEL,SAAK,UAAU,KAAK,QAAQ,gBAAgB,CAAA,CAAE;AAAA,EAAA;AAAA,EAVhD;AAAA,EAyBA;AAAA,EAkBA;AAAA,EAIA;AAAA,EAyDA;AAAA,EAyBA;AA8BF;AAoCO,SAAS,SACd,IACA,gBACA;AACA,QAAM,YAAY,IAAI,UAAU,IAAI,cAAc;AAClD,SAAO,UAAU;AACnB;"}
+{"version":3,"file":"throttler.js","sources":["../../src/throttler.ts"],"sourcesContent":["import { Store } from '@tanstack/store'\nimport { parseFunctionOrValue } from './utils'\nimport type { AnyFunction } from './types'\n\nexport interface ThrottlerState<TFn extends AnyFunction> {\n  /**\n   * Number of function executions that have been completed\n   */\n  executionCount: number\n  /**\n   * Whether the throttler is waiting for the timeout to trigger execution\n   */\n  isPending: boolean\n  /**\n   * The arguments from the most recent call to maybeExecute\n   */\n  lastArgs: Parameters<TFn> | undefined\n  /**\n   * Timestamp of the last function execution in milliseconds\n   */\n  lastExecutionTime: number\n  /**\n   * Timestamp when the next execution can occur in milliseconds\n   */\n  nextExecutionTime: number\n  /**\n   * Current execution status - 'idle' when not active, 'pending' when waiting for timeout\n   */\n  status: 'disabled' | 'idle' | 'pending'\n}\n\nfunction getDefaultThrottlerState<\n  TFn extends AnyFunction,\n>(): ThrottlerState<TFn> {\n  return structuredClone({\n    executionCount: 0,\n    isPending: false,\n    lastArgs: undefined,\n    lastExecutionTime: 0,\n    nextExecutionTime: 0,\n    status: 'idle',\n  })\n}\n\n/**\n * Options for configuring a throttled function\n */\nexport interface ThrottlerOptions<TFn extends AnyFunction> {\n  /**\n   * Whether the throttler is enabled. When disabled, maybeExecute will not trigger any executions.\n   * Can be a boolean or a function that returns a boolean.\n   * Defaults to true.\n   */\n  enabled?: boolean | ((throttler: Throttler<TFn>) => boolean)\n  /**\n   * Initial state for the throttler\n   */\n  initialState?: Partial<ThrottlerState<TFn>>\n  /**\n   * Whether to execute on the leading edge of the timeout.\n   * Defaults to true.\n   */\n  leading?: boolean\n  /**\n   * Callback function that is called after the function is executed\n   */\n  onExecute?: (throttler: Throttler<TFn>) => void\n  /**\n   * Whether to execute on the trailing edge of the timeout.\n   * Defaults to true.\n   */\n  trailing?: boolean\n  /**\n   * Time window in milliseconds during which the function can only be executed once.\n   * Can be a number or a function that returns a number.\n   * Defaults to 0ms\n   */\n  wait: number | ((throttler: Throttler<TFn>) => number)\n}\n\nconst defaultOptions: Omit<\n  Required<ThrottlerOptions<any>>,\n  'initialState' | 'onExecute'\n> = {\n  enabled: true,\n  leading: true,\n  trailing: true,\n  wait: 0,\n}\n\n/**\n * A class that creates a throttled function.\n *\n * Throttling ensures a function is called at most once within a specified time window.\n * Unlike debouncing which waits for a pause in calls, throttling guarantees consistent\n * execution timing regardless of call frequency.\n *\n * Supports both leading and trailing edge execution:\n * - Leading: Execute immediately on first call (default: true)\n * - Trailing: Execute after wait period if called during throttle (default: true)\n *\n * For collapsing rapid-fire events where you only care about the last call, consider using Debouncer.\n *\n * State Management:\n * - Uses TanStack Store for reactive state management\n * - Use `initialState` to provide initial state values when creating the throttler\n * - Use `onExecute` callback to react to function execution and implement custom logic\n * - The state includes execution count, last execution time, pending status, and more\n * - State can be accessed via `throttler.store.state` when using the class directly\n * - When using framework adapters (React/Solid), state is accessed from `throttler.state`\n *\n * @example\n * ```ts\n * const throttler = new Throttler(\n *   (id: string) => api.getData(id),\n *   { wait: 1000 } // Execute at most once per second\n * );\n *\n * // First call executes immediately\n * throttler.maybeExecute('123');\n *\n * // Subsequent calls within 1000ms are throttled\n * throttler.maybeExecute('123'); // Throttled\n * ```\n */\nexport class Throttler<TFn extends AnyFunction> {\n  readonly store: Store<Readonly<ThrottlerState<TFn>>> = new Store(\n    getDefaultThrottlerState(),\n  )\n  options: ThrottlerOptions<TFn>\n  #timeoutId: NodeJS.Timeout | undefined\n\n  constructor(\n    private fn: TFn,\n    initialOptions: ThrottlerOptions<TFn>,\n  ) {\n    this.options = {\n      ...defaultOptions,\n      ...initialOptions,\n    }\n    this.#setState(this.options.initialState ?? {})\n  }\n\n  /**\n   * Updates the throttler options\n   */\n  setOptions = (newOptions: Partial<ThrottlerOptions<TFn>>): void => {\n    this.options = { ...this.options, ...newOptions }\n\n    // Cancel pending execution if the throttler is disabled\n    if (!this.#getEnabled()) {\n      this.cancel()\n    }\n  }\n\n  #setState = (newState: Partial<ThrottlerState<TFn>>): void => {\n    this.store.setState((state) => {\n      const combinedState = {\n        ...state,\n        ...newState,\n      }\n      const { isPending } = combinedState\n      return {\n        ...combinedState,\n        status: !this.#getEnabled()\n          ? 'disabled'\n          : isPending\n            ? 'pending'\n            : 'idle',\n      }\n    })\n  }\n\n  #getEnabled = (): boolean => {\n    return !!parseFunctionOrValue(this.options.enabled, this)\n  }\n\n  #getWait = (): number => {\n    return parseFunctionOrValue(this.options.wait, this)\n  }\n\n  /**\n   * Attempts to execute the throttled function. The execution behavior depends on the throttler options:\n   *\n   * - If enough time has passed since the last execution (>= wait period):\n   *   - With leading=true: Executes immediately\n   *   - With leading=false: Waits for the next trailing execution\n   *\n   * - If within the wait period:\n   *   - With trailing=true: Schedules execution for end of wait period\n   *   - With trailing=false: Drops the execution\n   *\n   * @example\n   * ```ts\n   * const throttled = new Throttler(fn, { wait: 1000 });\n   *\n   * // First call executes immediately\n   * throttled.maybeExecute('a', 'b');\n   *\n   * // Call during wait period - gets throttled\n   * throttled.maybeExecute('c', 'd');\n   * ```\n   */\n  maybeExecute = (...args: Parameters<TFn>): void => {\n    const now = Date.now()\n    const timeSinceLastExecution = now - this.store.state.lastExecutionTime\n    const wait = this.#getWait()\n\n    // Handle leading execution\n    if (this.options.leading && timeSinceLastExecution >= wait) {\n      this.#execute(...args)\n    } else {\n      // Store the most recent arguments for potential trailing execution\n      this.#setState({\n        lastArgs: args,\n      })\n      // Set up trailing execution if not already scheduled\n      if (!this.#timeoutId && this.options.trailing) {\n        // prevent large number if lastExecutionTime is undefined\n        const _timeSinceLastExecution = this.store.state.lastExecutionTime\n          ? now - this.store.state.lastExecutionTime\n          : 0\n        const timeoutDuration = wait - _timeSinceLastExecution\n        this.#setState({ isPending: true })\n        this.#timeoutId = setTimeout(() => {\n          const { lastArgs } = this.store.state\n          if (lastArgs !== undefined) {\n            this.#execute(...lastArgs)\n          }\n        }, timeoutDuration)\n      }\n    }\n  }\n\n  #execute = (...args: Parameters<TFn>): void => {\n    if (!this.#getEnabled()) return\n    this.fn(...args) // EXECUTE!\n    const lastExecutionTime = Date.now()\n    const nextExecutionTime = lastExecutionTime + this.#getWait()\n    this.#clearTimeout()\n    this.#setState({\n      executionCount: this.store.state.executionCount + 1,\n      lastExecutionTime,\n      nextExecutionTime,\n      isPending: false,\n      lastArgs: undefined,\n    })\n    this.options.onExecute?.(this)\n  }\n\n  /**\n   * Processes the current pending execution immediately\n   */\n  flush = (): void => {\n    if (this.store.state.isPending && this.store.state.lastArgs) {\n      this.#execute(...this.store.state.lastArgs)\n    }\n  }\n\n  #clearTimeout = (): void => {\n    if (this.#timeoutId) {\n      clearTimeout(this.#timeoutId)\n      this.#timeoutId = undefined\n    }\n  }\n\n  /**\n   * Cancels any pending trailing execution and clears internal state.\n   *\n   * If a trailing execution is scheduled (due to throttling with trailing=true),\n   * this will prevent that execution from occurring. The internal timeout and\n   * stored arguments will be cleared.\n   *\n   * Has no effect if there is no pending execution.\n   */\n  cancel = (): void => {\n    this.#clearTimeout()\n    this.#setState({\n      lastArgs: undefined,\n      isPending: false,\n    })\n  }\n\n  /**\n   * Resets the throttler state to its default values\n   */\n  reset = (): void => {\n    this.#setState(getDefaultThrottlerState<TFn>())\n  }\n}\n\n/**\n * Creates a throttled function that limits how often the provided function can execute.\n *\n * Throttling ensures a function executes at most once within a specified time window,\n * regardless of how many times it is called. This is useful for rate-limiting\n * expensive operations or UI updates.\n *\n * The throttled function can be configured to execute on the leading and/or trailing\n * edge of the throttle window via options.\n *\n * For handling bursts of events, consider using debounce() instead. 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package.json

 {
   "name": "@tanstack/pacer",
-  "version": "0.9.1",
+  "version": "0.10.0",
   "description": "Utilities for debouncing, throttling, rate-limiting, queuing, and more.",
@@ -5,0 +5,0 @@ "author": "Tanner Linsley",

src/async-batcher.ts

@@ -27,6 +27,2 @@ import { Store } from '@tanstack/store'
   /**
-   * Whether the batcher is active and will process items automatically
-   */
-  isRunning: boolean
-  /**
    * Array of items currently queued for batch processing
@@ -56,9 +52,9 @@ */
   /**
+   * Total number of items that have failed processing across all batches
+   */
+  totalItemsFailed: number
+  /**
    * Total number of items that have been processed across all batches
    */
   totalItemsProcessed: number
-  /**
-   * Total number of items that have failed processing across all batches
-   */
-  totalItemsFailed: number
 }
@@ -73,3 +69,2 @@
     isPending: false,
-    isRunning: true,
     items: [],
@@ -303,3 +298,3 @@ lastResult: undefined,
       this.#execute()
-    } else if (this.store.state.isRunning && this.options.wait !== Infinity) {
+    } else if (this.options.wait !== Infinity) {
       this.#clearTimeout() // clear any pending timeout to replace it with a new one
@@ -373,20 +368,2 @@ this.#timeoutId = setTimeout(() => this.#execute(), this.#getWait())
   /**
-   * Stops the async batcher from processing batches
-   */
-  stop = (): void => {
-    this.#setState({ isRunning: false })
-    this.#clearTimeout()
-  }
-
-  /**
-   * Starts the async batcher and processes any pending items
-   */
-  start = (): void => {
-    this.#setState({ isRunning: true })
-    if (this.store.state.items.length > 0 && !this.#timeoutId) {
-      this.#timeoutId = setTimeout(() => this.#execute(), this.#getWait())
-    }
-  }
-
-  /**
    * Returns a copy of all items in the async batcher
@@ -393,0 +370,0 @@ */

src/async-debouncer.ts

@@ -179,2 +179,3 @@ import { Store } from '@tanstack/store'
     | null = null
+  #rejectPreviousPromise: ((reason?: unknown) => void) | null = null
 
@@ -274,4 +275,5 @@ constructor(
 
-    return new Promise((resolve) => {
+    return new Promise((resolve, reject) => {
       this.#resolvePreviousPromise = resolve
+      this.#rejectPreviousPromise = reject
       this.#timeoutId = setTimeout(async () => {
@@ -310,3 +312,3 @@ // Execute trailing if enabled
       if (this.options.throwOnError) {
-        throw error
+        this.#rejectPreviousPromiseInternal(error)
       }
@@ -328,10 +330,30 @@ } finally {
    */
-  flush = (): void => {
+  flush = async (): Promise<ReturnType<TFn> | undefined> => {
     if (this.store.state.isPending && this.store.state.lastArgs) {
       this.#abortExecution() // abort any current execution
       this.#clearTimeout() // clear any existing timeout
-      this.#execute(...this.store.state.lastArgs)
+      const result = await this.#execute(...this.store.state.lastArgs)
+
+      // Resolve any pending promise from maybeExecute
+      this.#resolvePreviousPromiseInternal()
+
+      return result
     }
+    return undefined
   }
 
+  #resolvePreviousPromiseInternal = (): void => {
+    if (this.#resolvePreviousPromise) {
+      this.#resolvePreviousPromise(this.store.state.lastResult)
+      this.#resolvePreviousPromise = null
+    }
+  }
+
+  #rejectPreviousPromiseInternal = (error: unknown): void => {
+    if (this.#rejectPreviousPromise) {
+      this.#rejectPreviousPromise(error)
+      this.#rejectPreviousPromise = null
+    }
+  }
+
   #clearTimeout = (): void => {
@@ -346,6 +368,3 @@ if (this.#timeoutId) {
     this.#clearTimeout()
-    if (this.#resolvePreviousPromise) {
-      this.#resolvePreviousPromise(this.store.state.lastResult)
-      this.#resolvePreviousPromise = null
-    }
+    this.#resolvePreviousPromiseInternal()
     this.#setState({
@@ -352,0 +371,0 @@ isPending: false,

src/async-queuer.ts

@@ -36,2 +36,6 @@ import { Store } from '@tanstack/store'
   /**
+   * Array of items currently waiting to be processed
+   */
+  items: Array<TValue>
+  /**
    * Timestamps when items were added to the queue for expiration tracking
@@ -41,6 +45,2 @@ */
   /**
-   * Array of items currently waiting to be processed
-   */
-  items: Array<TValue>
-  /**
    * The result from the most recent task execution
@@ -512,2 +512,8 @@ */
 
+  #getAllItems = (): Array<TValue> => {
+    const items = this.peekAllItems()
+    this.clear()
+    return items
+  }
+
   /**
@@ -558,13 +564,25 @@ * Removes and returns the next item from the queue and executes the task function with it.
    */
-  flush = (
+  flush = async (
     numberOfItems: number = this.store.state.items.length,
     position?: QueuePosition,
-  ): void => {
+  ): Promise<void> => {
     this.#clearTimeouts() // clear any pending timeouts
-    for (let i = 0; i < numberOfItems; i++) {
-      this.execute(position)
-    }
+    await Promise.all(
+      Array.from({ length: numberOfItems }, () => this.execute(position)),
+    )
   }
 
   /**
+   * Processes all items in the queue as a batch using the provided function
+   * The queue is cleared after processing
+   */
+  flushAsBatch = async (
+    batchFunction: (items: Array<TValue>) => Promise<any>,
+  ): Promise<void> => {
+    this.#clearTimeouts() // clear any pending timeouts
+    const items = this.#getAllItems()
+    await batchFunction(items)
+  }
+
+  /**
    * Checks for expired items in the queue and removes them. Calls onExpire for each expired item.
@@ -571,0 +589,0 @@ * Internal use only.

src/async-rate-limiter.ts

@@ -15,2 +15,6 @@ import { Store } from '@tanstack/store'
   /**
+   * Whether the rate limiter has exceeded the limit
+   */
+  isExceeded: boolean
+  /**
    * Whether the rate-limited function is currently executing asynchronously
@@ -32,2 +36,6 @@ */
   /**
+   * Current execution status - 'disabled' when not active, 'executing' when executing, 'idle' when not executing, 'exceeded' when rate limit is exceeded
+   */
+  status: 'disabled' | 'executing' | 'exceeded' | 'idle'
+  /**
    * Number of function executions that have completed successfully
@@ -44,2 +52,3 @@ */
     executionTimes: [],
+    isExceeded: false,
     isExecuting: false,
@@ -50,2 +59,3 @@ lastResult: undefined,
     successCount: 0,
+    status: 'idle',
   }
@@ -196,2 +206,3 @@ }
   options: AsyncRateLimiterOptions<TFn>
+  #timeoutIds: Set<NodeJS.Timeout> = new Set()
 
@@ -208,2 +219,5 @@ constructor(
     this.#setState(this.options.initialState ?? {})
+    for (const executionTime of this.#getExecutionTimesInWindow()) {
+      this.#setCleanupTimeout(executionTime)
+    }
   }
@@ -224,3 +238,15 @@
       }
-      return combinedState
+      const isExceeded = combinedState.executionTimes.length >= this.#getLimit()
+      const status = !this.#getEnabled()
+        ? 'disabled'
+        : combinedState.isExecuting
+          ? 'executing'
+          : isExceeded
+            ? 'exceeded'
+            : 'idle'
+      return {
+        ...combinedState,
+        isExceeded,
+        status,
+      }
     })
@@ -280,3 +306,3 @@ }
 
-    const relevantExecutionTimes = this.#getRelevantExecutionTimes()
+    const relevantExecutionTimes = this.#getExecutionTimesInWindow()
 
@@ -308,3 +334,4 @@ if (relevantExecutionTimes.length < this.#getLimit()) {
     try {
-      const result = await this.fn(...args)
+      const result = await this.fn(...args) // EXECUTE!
+      this.#setCleanupTimeout(now)
       this.#setState({
@@ -334,3 +361,3 @@ successCount: this.store.state.successCount + 1,
 
-  #getRelevantExecutionTimes = (): Array<number> => {
+  #getExecutionTimesInWindow = (): Array<number> => {
     if (this.options.windowType === 'sliding') {
@@ -344,7 +371,18 @@ // For sliding window, return all executions within the current window
       // The window starts from the oldest execution time
+      if (this.store.state.executionTimes.length === 0) {
+        return []
+      }
       const oldestExecution = Math.min(...this.store.state.executionTimes)
       const windowStart = oldestExecution
+      const windowEnd = windowStart + this.#getWindow()
+      const now = Date.now()
+
+      // If the window has expired, return empty array
+      if (now > windowEnd) {
+        return []
+      }
+
+      // Otherwise, return all executions in the current window
       return this.store.state.executionTimes.filter(
-        (time) =>
-          time >= windowStart && time <= windowStart + this.#getWindow(),
+        (time) => time >= windowStart && time <= windowEnd,
       )
@@ -354,9 +392,30 @@ }
 
+  #setCleanupTimeout = (executionTime: number): void => {
+    if (
+      this.options.windowType === 'sliding' ||
+      this.#timeoutIds.size === 0 // new fixed window
+    ) {
+      const now = Date.now()
+      const timeUntilExpiration = executionTime - now + this.#getWindow() + 1
+      const timeoutId = setTimeout(() => {
+        this.#cleanupOldExecutions()
+        this.#clearTimeout(timeoutId)
+      }, timeUntilExpiration)
+      this.#timeoutIds.add(timeoutId)
+    }
+  }
+
+  #clearTimeout = (timeoutId: NodeJS.Timeout): void => {
+    clearTimeout(timeoutId)
+    this.#timeoutIds.delete(timeoutId)
+  }
+
+  #clearTimeouts = (): void => {
+    this.#timeoutIds.forEach((timeoutId) => clearTimeout(timeoutId))
+    this.#timeoutIds.clear()
+  }
+
   #cleanupOldExecutions = (): void => {
-    const now = Date.now()
-    const windowStart = now - this.#getWindow()
     this.#setState({
-      executionTimes: this.store.state.executionTimes.filter(
-        (time) => time > windowStart,
-      ),
+      executionTimes: this.#getExecutionTimesInWindow(),
     })
@@ -369,3 +428,3 @@ }
   getRemainingInWindow = (): number => {
-    const relevantExecutionTimes = this.#getRelevantExecutionTimes()
+    const relevantExecutionTimes = this.#getExecutionTimesInWindow()
     return Math.max(0, this.#getLimit() - relevantExecutionTimes.length)
@@ -392,2 +451,3 @@ }
     this.#setState(getDefaultAsyncRateLimiterState())
+    this.#clearTimeouts()
   }
@@ -394,0 +454,0 @@ }

src/async-throttler.ts

@@ -190,2 +190,3 @@ import { Store } from '@tanstack/store'
     | null = null
+  #rejectPreviousPromise: ((reason?: unknown) => void) | null = null
 
@@ -291,4 +292,5 @@ constructor(
     } else {
-      return new Promise((resolve) => {
+      return new Promise((resolve, reject) => {
         this.#resolvePreviousPromise = resolve
+        this.#rejectPreviousPromise = reject
         // Clear any existing timeout to ensure we use the latest arguments
@@ -335,5 +337,3 @@ this.#clearTimeout()
       if (this.options.throwOnError) {
-        throw error
-      } else {
-        console.error(error)
+        this.#rejectPreviousPromiseInternal(error)
       }
@@ -359,8 +359,14 @@ } finally {
    */
-  flush = (): void => {
+  flush = async (): Promise<ReturnType<TFn> | undefined> => {
     if (this.store.state.isPending && this.store.state.lastArgs) {
       this.#abortExecution() // abort any current execution
       this.#clearTimeout() // clear any existing timeout
-      this.#execute(...this.store.state.lastArgs)
+      const result = await this.#execute(...this.store.state.lastArgs)
+
+      // Resolve any pending promise from maybeExecute
+      this.#resolvePreviousPromiseInternal()
+
+      return result
     }
+    return undefined
   }
@@ -375,2 +381,9 @@
 
+  #rejectPreviousPromiseInternal = (error: unknown): void => {
+    if (this.#rejectPreviousPromise) {
+      this.#rejectPreviousPromise(error)
+      this.#rejectPreviousPromise = null
+    }
+  }
+
   #clearTimeout = (): void => {
@@ -377,0 +390,0 @@ if (this.#timeoutId) {

src/batcher.ts

@@ -19,10 +19,2 @@ import { Store } from '@tanstack/store'
   /**
-   * Whether the batcher is active and will process items automatically
-   */
-  isRunning: boolean
-  /**
-   * Total number of items that have been processed across all batches
-   */
-  totalItemsProcessed: number
-  /**
    * Array of items currently queued for batch processing
@@ -39,2 +31,6 @@ */
   status: 'idle' | 'pending'
+  /**
+   * Total number of items that have been processed across all batches
+   */
+  totalItemsProcessed: number
 }
@@ -47,3 +43,2 @@
     isPending: false,
-    isRunning: true,
     totalItemsProcessed: 0,
@@ -210,3 +205,3 @@ items: [],
       this.#execute()
-    } else if (this.store.state.isRunning && this.options.wait !== Infinity) {
+    } else if (this.options.wait !== Infinity) {
       this.#clearTimeout() // clear any pending timeout to replace it with a new one
@@ -252,20 +247,2 @@ this.#timeoutId = setTimeout(() => this.#execute(), this.#getWait())
   /**
-   * Stops the batcher from processing batches
-   */
-  stop = (): void => {
-    this.#setState({ isRunning: false })
-    this.#clearTimeout()
-  }
-
-  /**
-   * Starts the batcher and processes any pending items
-   */
-  start = (): void => {
-    this.#setState({ isRunning: true })
-    if (this.store.state.items.length > 0) {
-      this.#execute()
-    }
-  }
-
-  /**
    * Returns a copy of all items in the batcher
@@ -272,0 +249,0 @@ */

src/queuer.ts

@@ -30,2 +30,6 @@ import { Store } from '@tanstack/store'
   /**
+   * Array of items currently waiting to be processed
+   */
+  items: Array<TValue>
+  /**
    * Timestamps when items were added to the queue for expiration tracking
@@ -35,6 +39,2 @@ */
   /**
-   * Array of items currently waiting to be processed
-   */
-  items: Array<TValue>
-  /**
    * Whether the queuer has a pending timeout for processing the next item
@@ -118,2 +118,6 @@ */
   /**
+   * Callback fired whenever an item is removed from the queuer
+   */
+  onExecute?: (item: TValue, queuer: Queuer<TValue>) => void
+  /**
    * Callback fired whenever an item expires in the queuer
@@ -123,6 +127,2 @@ */
   /**
-   * Callback fired whenever an item is removed from the queuer
-   */
-  onExecute?: (item: TValue, queuer: Queuer<TValue>) => void
-  /**
    * Callback fired whenever an item is added or removed from the queuer
@@ -479,2 +479,8 @@ */
 
+  #getAllItems = (): Array<TValue> => {
+    const items = this.peekAllItems()
+    this.clear()
+    return items
+  }
+
   /**
@@ -518,2 +524,12 @@ * Removes and returns the next item from the queue and processes it using the provided function.
   /**
+   * Processes all items in the queue as a batch using the provided function
+   * The queue is cleared after processing
+   */
+  flushAsBatch = (batchFunction: (items: Array<TValue>) => void): void => {
+    const items = this.#getAllItems()
+    this.clear()
+    batchFunction(items)
+  }
+
+  /**
    * Checks for expired items in the queue and removes them. Calls onExpire for each expired item.
@@ -520,0 +536,0 @@ * Internal use only.

src/rate-limiter.ts

@@ -15,5 +15,13 @@ import { Store } from '@tanstack/store'
   /**
+   * Whether the rate limiter has exceeded the limit
+   */
+  isExceeded: boolean
+  /**
    * Number of function executions that have been rejected due to rate limiting
    */
   rejectionCount: number
+  /**
+   * Current execution status - 'disabled' when not active, 'executing' when executing, 'idle' when not executing, 'exceeded' when rate limit is exceeded
+   */
+  status: 'disabled' | 'exceeded' | 'idle'
 }
@@ -25,3 +33,5 @@
     executionTimes: [],
+    isExceeded: false,
     rejectionCount: 0,
+    status: 'idle',
   })
@@ -128,2 +138,3 @@ }
   options: RateLimiterOptions<TFn>
+  #timeoutIds: Set<NodeJS.Timeout> = new Set()
 
@@ -139,2 +150,5 @@ constructor(
     this.#setState(this.options.initialState ?? {})
+    for (const executionTime of this.#getExecutionTimesInWindow()) {
+      this.#setCleanupTimeout(executionTime)
+    }
   }
@@ -155,3 +169,13 @@
       }
-      return combinedState
+      const isExceeded = combinedState.executionTimes.length >= this.#getLimit()
+      const status = !this.#getEnabled()
+        ? 'disabled'
+        : isExceeded
+          ? 'exceeded'
+          : 'idle'
+      return {
+        ...combinedState,
+        isExceeded,
+        status,
+      }
     })
@@ -199,3 +223,3 @@ }
 
-    const relevantExecutionTimes = this.#getRelevantExecutionTimes()
+    const relevantExecutionTimes = this.#getExecutionTimesInWindow()
 
@@ -219,2 +243,5 @@ if (relevantExecutionTimes.length < this.#getLimit()) {
     this.store.state.executionTimes.push(now) // mutate state directly for performance
+
+    this.#setCleanupTimeout(now)
+
     this.#setState({
@@ -226,3 +253,3 @@ executionCount: this.store.state.executionCount + 1,
 
-  #getRelevantExecutionTimes = (): Array<number> => {
+  #getExecutionTimesInWindow = (): Array<number> => {
     if (this.options.windowType === 'sliding') {
@@ -236,7 +263,18 @@ // For sliding window, return all executions within the current window
       // The window starts from the oldest execution time
+      if (this.store.state.executionTimes.length === 0) {
+        return []
+      }
       const oldestExecution = Math.min(...this.store.state.executionTimes)
       const windowStart = oldestExecution
+      const windowEnd = windowStart + this.#getWindow()
+      const now = Date.now()
+
+      // If the window has expired, return empty array
+      if (now > windowEnd) {
+        return []
+      }
+
+      // Otherwise, return all executions in the current window
       return this.store.state.executionTimes.filter(
-        (time) =>
-          time >= windowStart && time <= windowStart + this.#getWindow(),
+        (time) => time >= windowStart && time <= windowEnd,
       )
@@ -246,9 +284,30 @@ }
 
+  #setCleanupTimeout = (executionTime: number): void => {
+    if (
+      this.options.windowType === 'sliding' ||
+      this.#timeoutIds.size === 0 // new fixed window
+    ) {
+      const now = Date.now()
+      const timeUntilExpiration = executionTime - now + this.#getWindow() + 1
+      const timeoutId = setTimeout(() => {
+        this.#cleanupOldExecutions()
+        this.#clearTimeout(timeoutId)
+      }, timeUntilExpiration)
+      this.#timeoutIds.add(timeoutId)
+    }
+  }
+
+  #clearTimeout = (timeoutId: NodeJS.Timeout): void => {
+    clearTimeout(timeoutId)
+    this.#timeoutIds.delete(timeoutId)
+  }
+
+  #clearTimeouts = (): void => {
+    this.#timeoutIds.forEach((timeoutId) => clearTimeout(timeoutId))
+    this.#timeoutIds.clear()
+  }
+
   #cleanupOldExecutions = (): void => {
-    const now = Date.now()
-    const windowStart = now - this.#getWindow()
     this.#setState({
-      executionTimes: this.store.state.executionTimes.filter(
-        (time) => time > windowStart,
-      ),
+      executionTimes: this.#getExecutionTimesInWindow(),
     })
@@ -261,3 +320,3 @@ }
   getRemainingInWindow = (): number => {
-    const relevantExecutionTimes = this.#getRelevantExecutionTimes()
+    const relevantExecutionTimes = this.#getExecutionTimesInWindow()
     return Math.max(0, this.#getLimit() - relevantExecutionTimes.length)
@@ -282,2 +341,3 @@ }
     this.#setState(getDefaultRateLimiterState())
+    this.#clearTimeouts()
   }
@@ -284,0 +344,0 @@ }

src/throttler.ts

@@ -11,2 +11,6 @@ import { Store } from '@tanstack/store'
   /**
+   * Whether the throttler is waiting for the timeout to trigger execution
+   */
+  isPending: boolean
+  /**
    * The arguments from the most recent call to maybeExecute
@@ -24,6 +28,2 @@ */
   /**
-   * Whether the throttler is waiting for the timeout to trigger execution
-   */
-  isPending: boolean
-  /**
    * Current execution status - 'idle' when not active, 'pending' when waiting for timeout
@@ -30,0 +30,0 @@ */

No alert changes

Improved metrics

Total package byte prevSize

860920

3.24%

Lines of code

10587

3.35%

No dependency changes