@nerdalytics/beacon - npm Package Compare versions

Comparing version 1000.2.2 to 1000.2.3

src/index.ts

+// Core types for reactive primitives
+type Subscriber = () => void
+export type Unsubscribe = () => void
+export type ReadOnlyState<T> = () => T
+export interface WriteableState<T> {
+	set(value: T): void
+	update(fn: (value: T) => T): void
+}
+
+// Special symbol used for internal tracking
+const STATE_ID: unique symbol = Symbol('STATE_ID')
+
+export type State<T> = ReadOnlyState<T> &
+	WriteableState<T> & {
+		[STATE_ID]?: symbol
+	}
+
+/**
+ * Creates a reactive state container with the provided initial value.
+ */
+export const state = <T>(initialValue: T, equalityFn: (a: T, b: T) => boolean = Object.is): State<T> =>
+	StateImpl.createState(initialValue, equalityFn)
+
+/**
+ * Registers a function to run whenever its reactive dependencies change.
+ */
+export const effect = (fn: () => void): Unsubscribe => StateImpl.createEffect(fn)
+
+/**
+ * Groups multiple state updates to trigger effects only once at the end.
+ */
+export const batch = <T>(fn: () => T): T => StateImpl.executeBatch(fn)
+
+/**
+ * Creates a read-only computed value that updates when its dependencies change.
+ */
+export const derive = <T>(computeFn: () => T): ReadOnlyState<T> => StateImpl.createDerive(computeFn)
+
+/**
+ * Creates an efficient subscription to a subset of a state value.
+ */
+export const select = <T, R>(
+	source: ReadOnlyState<T>,
+	selectorFn: (state: T) => R,
+	equalityFn: (a: R, b: R) => boolean = Object.is
+): ReadOnlyState<R> => StateImpl.createSelect(source, selectorFn, equalityFn)
+
+/**
+ * Creates a read-only view of a state, hiding mutation methods.
+ */
+export const readonlyState =
+	<T>(state: State<T>): ReadOnlyState<T> =>
+	(): T =>
+		state()
+
+/**
+ * Creates a state with access control, returning a tuple of reader and writer.
+ */
+export const protectedState = <T>(
+	initialValue: T,
+	equalityFn: (a: T, b: T) => boolean = Object.is
+): [
+	ReadOnlyState<T>,
+	WriteableState<T>,
+] => {
+	const fullState = state(initialValue, equalityFn)
+	return [
+		(): T => readonlyState(fullState)(),
+		{
+			set: (value: T): void => fullState.set(value),
+			update: (fn: (value: T) => T): void => fullState.update(fn),
+		},
+	]
+}
+
+/**
+ * Creates a lens for direct updates to nested properties of a state.
+ */
+export const lens = <T, K>(source: State<T>, accessor: (state: T) => K): State<K> =>
+	StateImpl.createLens(source, accessor)
+
+class StateImpl<T> {
+	// Static fields track global reactivity state - this centralized approach allows
+	// for coordinated updates while maintaining individual state isolation
+	private static currentSubscriber: Subscriber | null = null
+	private static pendingSubscribers = new Set<Subscriber>()
+	private static isNotifying = false
+	private static batchDepth = 0
+	private static deferredEffectCreations: Subscriber[] = []
+	private static activeSubscribers = new Set<Subscriber>()
+
+	// WeakMaps enable automatic garbage collection when subscribers are no
+	// longer referenced, preventing memory leaks in long-running applications
+	private static stateTracking = new WeakMap<Subscriber, Set<symbol>>()
+	private static subscriberDependencies = new WeakMap<Subscriber, Set<Set<Subscriber>>>()
+	private static parentSubscriber = new WeakMap<Subscriber, Subscriber>()
+	private static childSubscribers = new WeakMap<Subscriber, Set<Subscriber>>()
+
+	// Instance state - each state has unique subscribers and ID
+	private value: T
+	private subscribers = new Set<Subscriber>()
+	private stateId = Symbol()
+	private equalityFn: (a: T, b: T) => boolean
+
+	constructor(initialValue: T, equalityFn: (a: T, b: T) => boolean = Object.is) {
+		this.value = initialValue
+		this.equalityFn = equalityFn
+	}
+
+	/**
+	 * Creates a reactive state container with the provided initial value.
+	 * Implementation of the public 'state' function.
+	 */
+	static createState = <T>(initialValue: T, equalityFn: (a: T, b: T) => boolean = Object.is): State<T> => {
+		const instance = new StateImpl<T>(initialValue, equalityFn)
+		const get = (): T => instance.get()
+		get.set = (value: T): void => instance.set(value)
+		get.update = (fn: (currentValue: T) => T): void => instance.update(fn)
+		get[STATE_ID] = instance.stateId
+		return get as State<T>
+	}
+
+	// Auto-tracks dependencies when called within effects, creating a fine-grained
+	// reactivity graph that only updates affected components
+	get = (): T => {
+		const currentEffect = StateImpl.currentSubscriber
+		if (currentEffect) {
+			// Add this effect to subscribers for future notification
+			this.subscribers.add(currentEffect)
+
+			// Maintain bidirectional dependency tracking to enable precise cleanup
+			// when effects are unsubscribed, preventing memory leaks
+			let dependencies = StateImpl.subscriberDependencies.get(currentEffect)
+			if (!dependencies) {
+				dependencies = new Set()
+				StateImpl.subscriberDependencies.set(currentEffect, dependencies)
+			}
+			dependencies.add(this.subscribers)
+
+			// Track read states to detect direct cyclical dependencies that
+			// could cause infinite loops
+			let readStates = StateImpl.stateTracking.get(currentEffect)
+			if (!readStates) {
+				readStates = new Set()
+				StateImpl.stateTracking.set(currentEffect, readStates)
+			}
+			readStates.add(this.stateId)
+		}
+		return this.value
+	}
+
+	// Handles value updates with built-in optimizations and safeguards
+	set = (newValue: T): void => {
+		// Skip updates for unchanged values to prevent redundant effect executions
+		if (this.equalityFn(this.value, newValue)) {
+			return
+		}
+
+		// Infinite loop detection prevents direct self-mutation within effects,
+		// while allowing nested effect patterns that would otherwise appear cyclical
+		const effect = StateImpl.currentSubscriber
+		if (effect) {
+			const states = StateImpl.stateTracking.get(effect)
+			if (states?.has(this.stateId) && !StateImpl.parentSubscriber.get(effect)) {
+				throw new Error('Infinite loop detected: effect() cannot update a state() it depends on!')
+			}
+		}
+
+		this.value = newValue
+
+		// Skip updates when there are no subscribers, avoiding unnecessary processing
+		if (this.subscribers.size === 0) {
+			return
+		}
+
+		// Queue notifications instead of executing immediately to support batch operations
+		// and prevent redundant effect runs
+		for (const sub of this.subscribers) {
+			StateImpl.pendingSubscribers.add(sub)
+		}
+
+		// Immediate execution outside of batches, deferred execution inside batches
+		if (StateImpl.batchDepth === 0 && !StateImpl.isNotifying) {
+			StateImpl.notifySubscribers()
+		}
+	}
+
+	update = (fn: (currentValue: T) => T): void => {
+		this.set(fn(this.value))
+	}
+
+	/**
+	 * Registers a function to run whenever its reactive dependencies change.
+	 * Implementation of the public 'effect' function.
+	 */
+	static createEffect = (fn: () => void): Unsubscribe => {
+		const runEffect = (): void => {
+			// Prevent re-entrance to avoid cascade updates during effect execution
+			if (StateImpl.activeSubscribers.has(runEffect)) {
+				return
+			}
+
+			StateImpl.activeSubscribers.add(runEffect)
+			const parentEffect = StateImpl.currentSubscriber
+
+			try {
+				// Clean existing subscriptions before running to ensure only
+				// currently accessed states are tracked as dependencies
+				StateImpl.cleanupEffect(runEffect)
+
+				// Set current context for automatic dependency tracking
+				StateImpl.currentSubscriber = runEffect
+				StateImpl.stateTracking.set(runEffect, new Set())
+
+				// Track parent-child relationships to handle nested effects correctly
+				// and enable hierarchical cleanup later
+				if (parentEffect) {
+					StateImpl.parentSubscriber.set(runEffect, parentEffect)
+					let children = StateImpl.childSubscribers.get(parentEffect)
+					if (!children) {
+						children = new Set()
+						StateImpl.childSubscribers.set(parentEffect, children)
+					}
+					children.add(runEffect)
+				}
+
+				// Execute the effect function, which will auto-track dependencies
+				fn()
+			} finally {
+				// Restore previous context when done
+				StateImpl.currentSubscriber = parentEffect
+				StateImpl.activeSubscribers.delete(runEffect)
+			}
+		}
+
+		// Run immediately unless we're in a batch operation
+		if (StateImpl.batchDepth === 0) {
+			runEffect()
+		} else {
+			// Still track parent-child relationship even when deferred,
+			// ensuring proper hierarchical cleanup later
+			if (StateImpl.currentSubscriber) {
+				const parent = StateImpl.currentSubscriber
+				StateImpl.parentSubscriber.set(runEffect, parent)
+				let children = StateImpl.childSubscribers.get(parent)
+				if (!children) {
+					children = new Set()
+					StateImpl.childSubscribers.set(parent, children)
+				}
+				children.add(runEffect)
+			}
+
+			// Queue for execution when batch completes
+			StateImpl.deferredEffectCreations.push(runEffect)
+		}
+
+		// Return cleanup function to properly disconnect from reactivity graph
+		return (): void => {
+			// Remove from dependency tracking to stop future notifications
+			StateImpl.cleanupEffect(runEffect)
+			StateImpl.pendingSubscribers.delete(runEffect)
+			StateImpl.activeSubscribers.delete(runEffect)
+			StateImpl.stateTracking.delete(runEffect)
+
+			// Clean up parent-child relationship bidirectionally
+			const parent = StateImpl.parentSubscriber.get(runEffect)
+			if (parent) {
+				const siblings = StateImpl.childSubscribers.get(parent)
+				if (siblings) {
+					siblings.delete(runEffect)
+				}
+			}
+			StateImpl.parentSubscriber.delete(runEffect)
+
+			// Recursively clean up child effects to prevent memory leaks in
+			// nested effect scenarios
+			const children = StateImpl.childSubscribers.get(runEffect)
+			if (children) {
+				for (const child of children) {
+					StateImpl.cleanupEffect(child)
+				}
+				children.clear()
+				StateImpl.childSubscribers.delete(runEffect)
+			}
+		}
+	}
+
+	/**
+	 * Groups multiple state updates to trigger effects only once at the end.
+	 * Implementation of the public 'batch' function.
+	 */
+	static executeBatch = <T>(fn: () => T): T => {
+		// Increment depth counter to handle nested batches correctly
+		StateImpl.batchDepth++
+		try {
+			return fn()
+		} catch (error: unknown) {
+			// Clean up on error to prevent stale subscribers from executing
+			// and potentially causing cascading errors
+			if (StateImpl.batchDepth === 1) {
+				StateImpl.pendingSubscribers.clear()
+				StateImpl.deferredEffectCreations.length = 0
+			}
+			throw error
+		} finally {
+			StateImpl.batchDepth--
+
+			// Only process effects when exiting the outermost batch,
+			// maintaining proper execution order while avoiding redundant runs
+			if (StateImpl.batchDepth === 0) {
+				// Process effects created during the batch
+				if (StateImpl.deferredEffectCreations.length > 0) {
+					const effectsToRun = [
+						...StateImpl.deferredEffectCreations,
+					]
+					StateImpl.deferredEffectCreations.length = 0
+					for (const effect of effectsToRun) {
+						effect()
+					}
+				}
+
+				// Process state updates that occurred during the batch
+				if (StateImpl.pendingSubscribers.size > 0 && !StateImpl.isNotifying) {
+					StateImpl.notifySubscribers()
+				}
+			}
+		}
+	}
+
+	/**
+	 * Creates a read-only computed value that updates when its dependencies change.
+	 * Implementation of the public 'derive' function.
+	 */
+	static createDerive = <T>(computeFn: () => T): ReadOnlyState<T> => {
+		// Create a container to hold state and minimize closure captures
+		const container = {
+			cachedValue: undefined as unknown as T,
+			computeFn,
+			initialized: false,
+			valueState: StateImpl.createState<T | undefined>(undefined),
+		}
+
+		// Internal effect automatically tracks dependencies and updates the derived value
+		StateImpl.createEffect(function deriveEffect(): void {
+			const newValue = container.computeFn()
+
+			// Only update if the value actually changed to preserve referential equality
+			// and prevent unnecessary downstream updates
+			if (!(container.initialized && Object.is(container.cachedValue, newValue))) {
+				container.cachedValue = newValue
+				container.valueState.set(newValue)
+			}
+
+			container.initialized = true
+		})
+
+		// Return function with lazy initialization - ensures value is available
+		// even when accessed before its dependencies have had a chance to update
+		return function deriveGetter(): T {
+			if (!container.initialized) {
+				container.cachedValue = container.computeFn()
+				container.initialized = true
+				container.valueState.set(container.cachedValue)
+			}
+			return container.valueState() as T
+		}
+	}
+
+	/**
+	 * Creates an efficient subscription to a subset of a state value.
+	 * Implementation of the public 'select' function.
+	 */
+	static createSelect = <T, R>(
+		source: ReadOnlyState<T>,
+		selectorFn: (state: T) => R,
+		equalityFn: (a: R, b: R) => boolean = Object.is
+	): ReadOnlyState<R> => {
+		// Create a container to hold state and minimize closure captures
+		const container = {
+			equalityFn,
+			initialized: false,
+			lastSelectedValue: undefined as R | undefined,
+			lastSourceValue: undefined as T | undefined,
+			selectorFn,
+			source,
+			valueState: StateImpl.createState<R | undefined>(undefined),
+		}
+
+		// Internal effect to track the source and update only when needed
+		StateImpl.createEffect(function selectEffect(): void {
+			const sourceValue = container.source()
+
+			// Skip computation if source reference hasn't changed
+			if (container.initialized && Object.is(container.lastSourceValue, sourceValue)) {
+				return
+			}
+
+			container.lastSourceValue = sourceValue
+			const newSelectedValue = container.selectorFn(sourceValue)
+
+			// Use custom equality function to determine if value semantically changed,
+			// allowing for deep equality comparisons with complex objects
+			if (
+				container.initialized &&
+				container.lastSelectedValue !== undefined &&
+				container.equalityFn(container.lastSelectedValue, newSelectedValue)
+			) {
+				return
+			}
+
+			// Update cache and notify subscribers due the value has changed
+			container.lastSelectedValue = newSelectedValue
+			container.valueState.set(newSelectedValue)
+			container.initialized = true
+		})
+
+		// Return function with eager initialization capability
+		return function selectGetter(): R {
+			if (!container.initialized) {
+				container.lastSourceValue = container.source()
+				container.lastSelectedValue = container.selectorFn(container.lastSourceValue)
+				container.valueState.set(container.lastSelectedValue)
+				container.initialized = true
+			}
+			return container.valueState() as R
+		}
+	}
+
+	/**
+	 * Creates a lens for direct updates to nested properties of a state.
+	 * Implementation of the public 'lens' function.
+	 */
+	static createLens = <T, K>(source: State<T>, accessor: (state: T) => K): State<K> => {
+		// Create a container to hold lens state and minimize closure captures
+		const container = {
+			accessor,
+			isUpdating: false,
+			lensState: null as unknown as State<K>,
+			originalSet: null as unknown as (value: K) => void,
+			path: [] as (string | number)[],
+			source,
+		}
+
+		// Extract the property path once during lens creation
+		const extractPath = (): (string | number)[] => {
+			const pathCollector: (string | number)[] = []
+			const proxy = new Proxy(
+				{},
+				{
+					get: (_: object, prop: string | symbol): unknown => {
+						if (typeof prop === 'string' || typeof prop === 'number') {
+							pathCollector.push(prop)
+						}
+						return proxy
+					},
+				}
+			)
+
+			try {
+				container.accessor(proxy as unknown as T)
+			} catch {
+				// Ignore errors, we're just collecting the path
+			}
+
+			return pathCollector
+		}
+
+		// Capture the path once
+		container.path = extractPath()
+
+		// Create a state with the initial value from the source
+		container.lensState = StateImpl.createState<K>(container.accessor(container.source()))
+		container.originalSet = container.lensState.set
+
+		// Set up an effect to sync from source to lens
+		StateImpl.createEffect(function lensEffect(): void {
+			if (container.isUpdating) {
+				return
+			}
+
+			container.isUpdating = true
+			try {
+				container.lensState.set(container.accessor(container.source()))
+			} finally {
+				container.isUpdating = false
+			}
+		})
+
+		// Override the lens state's set method to update the source
+		container.lensState.set = function lensSet(value: K): void {
+			if (container.isUpdating) {
+				return
+			}
+
+			container.isUpdating = true
+			try {
+				// Update lens state
+				container.originalSet(value)
+
+				// Update source by modifying the value at path
+				container.source.update((current: T): T => setValueAtPath(current, container.path, value))
+			} finally {
+				container.isUpdating = false
+			}
+		}
+
+		// Add update method for completeness
+		container.lensState.update = function lensUpdate(fn: (value: K) => K): void {
+			container.lensState.set(fn(container.lensState()))
+		}
+
+		return container.lensState
+	}
+
+	// Processes queued subscriber notifications in a controlled, non-reentrant way
+	private static notifySubscribers = (): void => {
+		// Prevent reentrance to avoid cascading notification loops when
+		// effects trigger further state changes
+		if (StateImpl.isNotifying) {
+			return
+		}
+
+		StateImpl.isNotifying = true
+
+		try {
+			// Process all pending effects in batches for better perf,
+			// ensuring topological execution order is maintained
+			while (StateImpl.pendingSubscribers.size > 0) {
+				// Process in snapshot batches to prevent infinite loops
+				// when effects trigger further state changes
+				const subscribers = Array.from(StateImpl.pendingSubscribers)
+				StateImpl.pendingSubscribers.clear()
+
+				for (const effect of subscribers) {
+					effect()
+				}
+			}
+		} finally {
+			StateImpl.isNotifying = false
+		}
+	}
+
+	// Removes effect from dependency tracking to prevent memory leaks
+	private static cleanupEffect = (effect: Subscriber): void => {
+		// Remove from execution queue to prevent stale updates
+		StateImpl.pendingSubscribers.delete(effect)
+
+		// Remove bidirectional dependency references to prevent memory leaks
+		const deps = StateImpl.subscriberDependencies.get(effect)
+		if (deps) {
+			for (const subscribers of deps) {
+				subscribers.delete(effect)
+			}
+			deps.clear()
+			StateImpl.subscriberDependencies.delete(effect)
+		}
+	}
+}
+// Helper for array updates
+const updateArrayItem = <V>(arr: unknown[], index: number, value: V): unknown[] => {
+	const copy = [
+		...arr,
+	]
+	copy[index] = value
+	return copy
+}
+
+// Helper for single-level updates (optimization)
+const updateShallowProperty = <V>(
+	obj: Record<string | number, unknown>,
+	key: string | number,
+	value: V
+): Record<string | number, unknown> => {
+	const result = {
+		...obj,
+	}
+	result[key] = value
+	return result
+}
+
+// Helper to create the appropriate container type
+const createContainer = (key: string | number): Record<string | number, unknown> | unknown[] => {
+	const isArrayKey = typeof key === 'number' || !Number.isNaN(Number(key))
+	return isArrayKey ? [] : {}
+}
+
+// Helper for handling array path updates
+const updateArrayPath = <V>(array: unknown[], pathSegments: (string | number)[], value: V): unknown[] => {
+	const index = Number(pathSegments[0])
+
+	if (pathSegments.length === 1) {
+		// Simple array item update
+		return updateArrayItem(array, index, value)
+	}
+
+	// Nested path in array
+	const copy = [
+		...array,
+	]
+	const nextPathSegments = pathSegments.slice(1)
+	const nextKey = nextPathSegments[0]
+
+	// For null/undefined values in arrays, create appropriate containers
+	let nextValue = array[index]
+	if (nextValue === undefined || nextValue === null) {
+		// Use empty object as default if nextKey is undefined
+		nextValue = nextKey !== undefined ? createContainer(nextKey) : {}
+	}
+
+	copy[index] = setValueAtPath(nextValue, nextPathSegments, value)
+	return copy
+}
+
+// Helper for handling object path updates
+const updateObjectPath = <V>(
+	obj: Record<string | number, unknown>,
+	pathSegments: (string | number)[],
+	value: V
+): Record<string | number, unknown> => {
+	// Ensure we have a valid key
+	const currentKey = pathSegments[0]
+	if (currentKey === undefined) {
+		// This shouldn't happen given our checks in the main function
+		return obj
+	}
+
+	if (pathSegments.length === 1) {
+		// Simple object property update
+		return updateShallowProperty(obj, currentKey, value)
+	}
+
+	// Nested path in object
+	const nextPathSegments = pathSegments.slice(1)
+	const nextKey = nextPathSegments[0]
+
+	// For null/undefined values, create appropriate containers
+	let currentValue = obj[currentKey]
+	if (currentValue === undefined || currentValue === null) {
+		// Use empty object as default if nextKey is undefined
+		currentValue = nextKey !== undefined ? createContainer(nextKey) : {}
+	}
+
+	// Create new object with updated property
+	const result = {
+		...obj,
+	}
+	result[currentKey] = setValueAtPath(currentValue, nextPathSegments, value)
+	return result
+}
+
+// Simplified function to update a nested value at a path
+const setValueAtPath = <V, O>(obj: O, pathSegments: (string | number)[], value: V): O => {
+	// Handle base cases
+	if (pathSegments.length === 0) {
+		return value as unknown as O
+	}
+
+	if (obj === undefined || obj === null) {
+		return setValueAtPath({} as O, pathSegments, value)
+	}
+
+	const currentKey = pathSegments[0]
+	if (currentKey === undefined) {
+		return obj
+	}
+
+	// Delegate to specialized handlers based on data type
+	if (Array.isArray(obj)) {
+		return updateArrayPath(obj, pathSegments, value) as unknown as O
+	}
+
+	return updateObjectPath(obj as Record<string | number, unknown>, pathSegments, value) as unknown as O
+}

package.json

@@ -5,4 +5,5 @@ {
 	"devDependencies": {
-		"@biomejs/biome": "2.2.6",
+		"@biomejs/biome": "2.2.7",
 		"@types/node": "24.9.1",
+		"npm-check-updates": "19.1.1",
 		"typescript": "5.9.3",
@@ -24,9 +25,9 @@ "uglify-js": "3.19.3"
 			"types": "./dist/src/index.d.ts",
-			"typescript": "./dist/src/index.ts"
+			"typescript": "./src/index.ts"
 		}
 	},
 	"files": [
-		"dist/src/index.js",
+		"dist/src/index.min.js",
 		"dist/src/index.d.ts",
-		"dist/src/index.ts",
+		"src/index.ts",
 		"LICENSE"
@@ -54,3 +55,3 @@ ],
 	"name": "@nerdalytics/beacon",
-	"packageManager": "npm@11.6.0",
+	"packageManager": "npm@11.6.2",
 	"repository": {
@@ -93,2 +94,3 @@ "type": "git",
 		"test:unit:state": "node --test tests/state.test.ts",
+		"update-dependencies": "npx npm-check-updates --interactive --upgrade --removeRange",
 		"update-performance-docs": "node --experimental-config-file=node.config.json scripts/update-performance-docs.ts"
@@ -98,3 +100,3 @@ },
 	"types": "dist/src/index.d.ts",
-	"version": "1000.2.2"
+	"version": "1000.2.3"
 }

README.md

@@ -7,2 +7,3 @@ # Beacon <img align="right" src="https://raw.githubusercontent.com/nerdalytics/beacon/refs/heads/trunk/assets/beacon-logo.svg" width="128px" alt="A stylized lighthouse beacon with golden light against a dark blue background, representing the reactive state library"/>
 [![registry:npm:version](https://img.shields.io/npm/v/@nerdalytics/beacon.svg)](https://www.npmjs.com/package/@nerdalytics/beacon)
+[![Socket Badge](https://badge.socket.dev/npm/package/@nerdalytics/beacon/latest)](https://badge.socket.dev/npm/package/@nerdalytics/beacon/latest)
 
@@ -9,0 +10,0 @@ [![tech:nodejs](https://img.shields.io/badge/Node%20js-339933?style=for-the-badge&logo=nodedotjs&logoColor=white)](https://nodejs.org/)

dist/src/index.js

-const STATE_ID = Symbol('STATE_ID');
-export const state = (initialValue, equalityFn = Object.is) => StateImpl.createState(initialValue, equalityFn);
-export const effect = (fn) => StateImpl.createEffect(fn);
-export const batch = (fn) => StateImpl.executeBatch(fn);
-export const derive = (computeFn) => StateImpl.createDerive(computeFn);
-export const select = (source, selectorFn, equalityFn = Object.is) => StateImpl.createSelect(source, selectorFn, equalityFn);
-export const readonlyState = (state) => () => state();
-export const protectedState = (initialValue, equalityFn = Object.is) => {
-    const fullState = state(initialValue, equalityFn);
-    return [
-        () => readonlyState(fullState)(),
-        {
-            set: (value) => fullState.set(value),
-            update: (fn) => fullState.update(fn),
-        },
-    ];
-};
-export const lens = (source, accessor) => StateImpl.createLens(source, accessor);
-class StateImpl {
-    static currentSubscriber = null;
-    static pendingSubscribers = new Set();
-    static isNotifying = false;
-    static batchDepth = 0;
-    static deferredEffectCreations = [];
-    static activeSubscribers = new Set();
-    static stateTracking = new WeakMap();
-    static subscriberDependencies = new WeakMap();
-    static parentSubscriber = new WeakMap();
-    static childSubscribers = new WeakMap();
-    value;
-    subscribers = new Set();
-    stateId = Symbol();
-    equalityFn;
-    constructor(initialValue, equalityFn = Object.is) {
-        this.value = initialValue;
-        this.equalityFn = equalityFn;
-    }
-    static createState = (initialValue, equalityFn = Object.is) => {
-        const instance = new StateImpl(initialValue, equalityFn);
-        const get = () => instance.get();
-        get.set = (value) => instance.set(value);
-        get.update = (fn) => instance.update(fn);
-        get[STATE_ID] = instance.stateId;
-        return get;
-    };
-    get = () => {
-        const currentEffect = StateImpl.currentSubscriber;
-        if (currentEffect) {
-            this.subscribers.add(currentEffect);
-            let dependencies = StateImpl.subscriberDependencies.get(currentEffect);
-            if (!dependencies) {
-                dependencies = new Set();
-                StateImpl.subscriberDependencies.set(currentEffect, dependencies);
-            }
-            dependencies.add(this.subscribers);
-            let readStates = StateImpl.stateTracking.get(currentEffect);
-            if (!readStates) {
-                readStates = new Set();
-                StateImpl.stateTracking.set(currentEffect, readStates);
-            }
-            readStates.add(this.stateId);
-        }
-        return this.value;
-    };
-    set = (newValue) => {
-        if (this.equalityFn(this.value, newValue)) {
-            return;
-        }
-        const effect = StateImpl.currentSubscriber;
-        if (effect) {
-            const states = StateImpl.stateTracking.get(effect);
-            if (states?.has(this.stateId) && !StateImpl.parentSubscriber.get(effect)) {
-                throw new Error('Infinite loop detected: effect() cannot update a state() it depends on!');
-            }
-        }
-        this.value = newValue;
-        if (this.subscribers.size === 0) {
-            return;
-        }
-        for (const sub of this.subscribers) {
-            StateImpl.pendingSubscribers.add(sub);
-        }
-        if (StateImpl.batchDepth === 0 && !StateImpl.isNotifying) {
-            StateImpl.notifySubscribers();
-        }
-    };
-    update = (fn) => {
-        this.set(fn(this.value));
-    };
-    static createEffect = (fn) => {
-        const runEffect = () => {
-            if (StateImpl.activeSubscribers.has(runEffect)) {
-                return;
-            }
-            StateImpl.activeSubscribers.add(runEffect);
-            const parentEffect = StateImpl.currentSubscriber;
-            try {
-                StateImpl.cleanupEffect(runEffect);
-                StateImpl.currentSubscriber = runEffect;
-                StateImpl.stateTracking.set(runEffect, new Set());
-                if (parentEffect) {
-                    StateImpl.parentSubscriber.set(runEffect, parentEffect);
-                    let children = StateImpl.childSubscribers.get(parentEffect);
-                    if (!children) {
-                        children = new Set();
-                        StateImpl.childSubscribers.set(parentEffect, children);
-                    }
-                    children.add(runEffect);
-                }
-                fn();
-            }
-            finally {
-                StateImpl.currentSubscriber = parentEffect;
-                StateImpl.activeSubscribers.delete(runEffect);
-            }
-        };
-        if (StateImpl.batchDepth === 0) {
-            runEffect();
-        }
-        else {
-            if (StateImpl.currentSubscriber) {
-                const parent = StateImpl.currentSubscriber;
-                StateImpl.parentSubscriber.set(runEffect, parent);
-                let children = StateImpl.childSubscribers.get(parent);
-                if (!children) {
-                    children = new Set();
-                    StateImpl.childSubscribers.set(parent, children);
-                }
-                children.add(runEffect);
-            }
-            StateImpl.deferredEffectCreations.push(runEffect);
-        }
-        return () => {
-            StateImpl.cleanupEffect(runEffect);
-            StateImpl.pendingSubscribers.delete(runEffect);
-            StateImpl.activeSubscribers.delete(runEffect);
-            StateImpl.stateTracking.delete(runEffect);
-            const parent = StateImpl.parentSubscriber.get(runEffect);
-            if (parent) {
-                const siblings = StateImpl.childSubscribers.get(parent);
-                if (siblings) {
-                    siblings.delete(runEffect);
-                }
-            }
-            StateImpl.parentSubscriber.delete(runEffect);
-            const children = StateImpl.childSubscribers.get(runEffect);
-            if (children) {
-                for (const child of children) {
-                    StateImpl.cleanupEffect(child);
-                }
-                children.clear();
-                StateImpl.childSubscribers.delete(runEffect);
-            }
-        };
-    };
-    static executeBatch = (fn) => {
-        StateImpl.batchDepth++;
-        try {
-            return fn();
-        }
-        catch (error) {
-            if (StateImpl.batchDepth === 1) {
-                StateImpl.pendingSubscribers.clear();
-                StateImpl.deferredEffectCreations.length = 0;
-            }
-            throw error;
-        }
-        finally {
-            StateImpl.batchDepth--;
-            if (StateImpl.batchDepth === 0) {
-                if (StateImpl.deferredEffectCreations.length > 0) {
-                    const effectsToRun = [
-                        ...StateImpl.deferredEffectCreations,
-                    ];
-                    StateImpl.deferredEffectCreations.length = 0;
-                    for (const effect of effectsToRun) {
-                        effect();
-                    }
-                }
-                if (StateImpl.pendingSubscribers.size > 0 && !StateImpl.isNotifying) {
-                    StateImpl.notifySubscribers();
-                }
-            }
-        }
-    };
-    static createDerive = (computeFn) => {
-        const container = {
-            cachedValue: undefined,
-            computeFn,
-            initialized: false,
-            valueState: StateImpl.createState(undefined),
-        };
-        StateImpl.createEffect(function deriveEffect() {
-            const newValue = container.computeFn();
-            if (!(container.initialized && Object.is(container.cachedValue, newValue))) {
-                container.cachedValue = newValue;
-                container.valueState.set(newValue);
-            }
-            container.initialized = true;
-        });
-        return function deriveGetter() {
-            if (!container.initialized) {
-                container.cachedValue = container.computeFn();
-                container.initialized = true;
-                container.valueState.set(container.cachedValue);
-            }
-            return container.valueState();
-        };
-    };
-    static createSelect = (source, selectorFn, equalityFn = Object.is) => {
-        const container = {
-            equalityFn,
-            initialized: false,
-            lastSelectedValue: undefined,
-            lastSourceValue: undefined,
-            selectorFn,
-            source,
-            valueState: StateImpl.createState(undefined),
-        };
-        StateImpl.createEffect(function selectEffect() {
-            const sourceValue = container.source();
-            if (container.initialized && Object.is(container.lastSourceValue, sourceValue)) {
-                return;
-            }
-            container.lastSourceValue = sourceValue;
-            const newSelectedValue = container.selectorFn(sourceValue);
-            if (container.initialized &&
-                container.lastSelectedValue !== undefined &&
-                container.equalityFn(container.lastSelectedValue, newSelectedValue)) {
-                return;
-            }
-            container.lastSelectedValue = newSelectedValue;
-            container.valueState.set(newSelectedValue);
-            container.initialized = true;
-        });
-        return function selectGetter() {
-            if (!container.initialized) {
-                container.lastSourceValue = container.source();
-                container.lastSelectedValue = container.selectorFn(container.lastSourceValue);
-                container.valueState.set(container.lastSelectedValue);
-                container.initialized = true;
-            }
-            return container.valueState();
-        };
-    };
-    static createLens = (source, accessor) => {
-        const container = {
-            accessor,
-            isUpdating: false,
-            lensState: null,
-            originalSet: null,
-            path: [],
-            source,
-        };
-        const extractPath = () => {
-            const pathCollector = [];
-            const proxy = new Proxy({}, {
-                get: (_, prop) => {
-                    if (typeof prop === 'string' || typeof prop === 'number') {
-                        pathCollector.push(prop);
-                    }
-                    return proxy;
-                },
-            });
-            try {
-                container.accessor(proxy);
-            }
-            catch {
-            }
-            return pathCollector;
-        };
-        container.path = extractPath();
-        container.lensState = StateImpl.createState(container.accessor(container.source()));
-        container.originalSet = container.lensState.set;
-        StateImpl.createEffect(function lensEffect() {
-            if (container.isUpdating) {
-                return;
-            }
-            container.isUpdating = true;
-            try {
-                container.lensState.set(container.accessor(container.source()));
-            }
-            finally {
-                container.isUpdating = false;
-            }
-        });
-        container.lensState.set = function lensSet(value) {
-            if (container.isUpdating) {
-                return;
-            }
-            container.isUpdating = true;
-            try {
-                container.originalSet(value);
-                container.source.update((current) => setValueAtPath(current, container.path, value));
-            }
-            finally {
-                container.isUpdating = false;
-            }
-        };
-        container.lensState.update = function lensUpdate(fn) {
-            container.lensState.set(fn(container.lensState()));
-        };
-        return container.lensState;
-    };
-    static notifySubscribers = () => {
-        if (StateImpl.isNotifying) {
-            return;
-        }
-        StateImpl.isNotifying = true;
-        try {
-            while (StateImpl.pendingSubscribers.size > 0) {
-                const subscribers = Array.from(StateImpl.pendingSubscribers);
-                StateImpl.pendingSubscribers.clear();
-                for (const effect of subscribers) {
-                    effect();
-                }
-            }
-        }
-        finally {
-            StateImpl.isNotifying = false;
-        }
-    };
-    static cleanupEffect = (effect) => {
-        StateImpl.pendingSubscribers.delete(effect);
-        const deps = StateImpl.subscriberDependencies.get(effect);
-        if (deps) {
-            for (const subscribers of deps) {
-                subscribers.delete(effect);
-            }
-            deps.clear();
-            StateImpl.subscriberDependencies.delete(effect);
-        }
-    };
-}
-const updateArrayItem = (arr, index, value) => {
-    const copy = [
-        ...arr,
-    ];
-    copy[index] = value;
-    return copy;
-};
-const updateShallowProperty = (obj, key, value) => {
-    const result = {
-        ...obj,
-    };
-    result[key] = value;
-    return result;
-};
-const createContainer = (key) => {
-    const isArrayKey = typeof key === 'number' || !Number.isNaN(Number(key));
-    return isArrayKey ? [] : {};
-};
-const updateArrayPath = (array, pathSegments, value) => {
-    const index = Number(pathSegments[0]);
-    if (pathSegments.length === 1) {
-        return updateArrayItem(array, index, value);
-    }
-    const copy = [
-        ...array,
-    ];
-    const nextPathSegments = pathSegments.slice(1);
-    const nextKey = nextPathSegments[0];
-    let nextValue = array[index];
-    if (nextValue === undefined || nextValue === null) {
-        nextValue = nextKey !== undefined ? createContainer(nextKey) : {};
-    }
-    copy[index] = setValueAtPath(nextValue, nextPathSegments, value);
-    return copy;
-};
-const updateObjectPath = (obj, pathSegments, value) => {
-    const currentKey = pathSegments[0];
-    if (currentKey === undefined) {
-        return obj;
-    }
-    if (pathSegments.length === 1) {
-        return updateShallowProperty(obj, currentKey, value);
-    }
-    const nextPathSegments = pathSegments.slice(1);
-    const nextKey = nextPathSegments[0];
-    let currentValue = obj[currentKey];
-    if (currentValue === undefined || currentValue === null) {
-        currentValue = nextKey !== undefined ? createContainer(nextKey) : {};
-    }
-    const result = {
-        ...obj,
-    };
-    result[currentKey] = setValueAtPath(currentValue, nextPathSegments, value);
-    return result;
-};
-const setValueAtPath = (obj, pathSegments, value) => {
-    if (pathSegments.length === 0) {
-        return value;
-    }
-    if (obj === undefined || obj === null) {
-        return setValueAtPath({}, pathSegments, value);
-    }
-    const currentKey = pathSegments[0];
-    if (currentKey === undefined) {
-        return obj;
-    }
-    if (Array.isArray(obj)) {
-        return updateArrayPath(obj, pathSegments, value);
-    }
-    return updateObjectPath(obj, pathSegments, value);
-};
-//# sourceMappingURL=index.js.map

New alerts

Major refactor

Supply chain risk

Package has recently undergone a major refactor. It may be unstable or indicate significant internal changes. Use caution when updating to versions that include significant changes.

Found 1 instance in 1 package

Fixed alerts

Major refactor

Supply chain risk

Package has recently undergone a major refactor. It may be unstable or indicate significant internal changes. Use caution when updating to versions that include significant changes.

Found 1 instance in 1 package

Improved metrics

Total package byte prevSize

51910

14.64%

Lines of code

605

42.69%

Number of lines in readme file

548

0.18%

Worsened metrics

Dev dependency count

5

25%

No dependency changes