@wordpress/sync - npm Package Compare versions

Comparing version 1.40.1-next.v.202602271551.0 to 1.41.0

build-types/provid...-polling/test/polling-manager.test.d.ts

+export {};
+//# sourceMappingURL=polling-manager.test.d.ts.map

build-types/provid...ling/test/polling-manager.test.d.ts.map

+{"version":3,"file":"polling-manager.test.d.ts","sourceRoot":"","sources":["../../../../src/providers/http-polling/test/polling-manager.test.ts"],"names":[],"mappings":""}

src/providers/http-polling/test/polling-manager.test.ts

+/**
+ * External dependencies
+ */
+import {
+	afterEach,
+	beforeEach,
+	describe,
+	expect,
+	it,
+	jest,
+} from '@jest/globals';
+import type { SyncResponse } from '../types';
+
+// Mock all external dependencies before imports.
+jest.mock( 'yjs', () => ( {
+	mergeUpdates: jest.fn( () => new Uint8Array() ),
+	applyUpdate: jest.fn(),
+	encodeStateAsUpdate: jest.fn( () => new Uint8Array() ),
+} ) );
+
+jest.mock( 'lib0/encoding', () => ( {
+	createEncoder: jest.fn( () => ( {} ) ),
+	toUint8Array: jest.fn( () => new Uint8Array( [ 0 ] ) ),
+} ) );
+
+jest.mock( 'lib0/decoding', () => ( {
+	createDecoder: jest.fn( () => ( {} ) ),
+} ) );
+
+jest.mock( 'y-protocols/sync', () => ( {
+	writeSyncStep1: jest.fn(),
+	readSyncMessage: jest.fn(),
+} ) );
+
+jest.mock( 'y-protocols/awareness', () => ( {
+	removeAwarenessStates: jest.fn(),
+} ) );
+
+jest.mock( '../utils', () => ( {
+	base64ToUint8Array: jest.fn( () => new Uint8Array() ),
+	createSyncUpdate: jest.fn( ( _data: unknown, type: string ) => ( {
+		data: '',
+		type,
+	} ) ),
+	createUpdateQueue: jest.fn( () => ( {
+		add: jest.fn(),
+		addBulk: jest.fn(),
+		clear: jest.fn(),
+		get: jest.fn( () => [] ),
+		pause: jest.fn(),
+		restore: jest.fn(),
+		resume: jest.fn(),
+		size: jest.fn( () => 0 ),
+	} ) ),
+	postSyncUpdate: jest.fn(),
+	postSyncUpdateNonBlocking: jest.fn(),
+} ) );
+
+interface PollingManager {
+	registerRoom: ( options: {
+		room: string;
+		doc: unknown;
+		awareness: unknown;
+		log: () => void;
+		onStatusChange: () => void;
+		onSync: () => void;
+	} ) => void;
+	unregisterRoom: ( room: string ) => void;
+}
+
+function createDeferred< T >() {
+	let resolve!: ( value: T ) => void;
+	const promise = new Promise< T >( ( res ) => {
+		resolve = res;
+	} );
+	return { promise, resolve };
+}
+
+function createMockDoc( clientID = 1 ) {
+	return { clientID, on: jest.fn(), off: jest.fn() };
+}
+
+function createMockAwareness() {
+	return {
+		clientID: 1,
+		getLocalState: jest.fn( () => ( {} ) ),
+		getStates: jest.fn( () => new Map() ),
+		on: jest.fn(),
+		off: jest.fn(),
+		emit: jest.fn(),
+	};
+}
+
+function simulateVisibilityChange( state: string ) {
+	Object.defineProperty( document, 'visibilityState', {
+		configurable: true,
+		get: () => state,
+	} );
+	document.dispatchEvent( new Event( 'visibilitychange' ) );
+}
+
+const syncResponse = {
+	rooms: [
+		{
+			room: 'test-room',
+			end_cursor: 1,
+			awareness: {},
+			updates: [],
+		},
+	],
+};
+
+describe( 'polling-manager', () => {
+	let pollingManager: PollingManager;
+	let mockPostSyncUpdate: jest.Mock<
+		typeof import('../utils').postSyncUpdate
+	>;
+
+	beforeEach( () => {
+		jest.useFakeTimers();
+
+		// Use isolateModules so each test gets fresh module-level state
+		// (isPolling, pollingTimeoutId, roomStates, etc.).
+		jest.isolateModules( () => {
+			pollingManager = require( '../polling-manager' ).pollingManager;
+			mockPostSyncUpdate = require( '../utils' ).postSyncUpdate;
+		} );
+	} );
+
+	afterEach( () => {
+		jest.clearAllTimers();
+		jest.useRealTimers();
+		Object.defineProperty( document, 'visibilityState', {
+			configurable: true,
+			get: () => 'visible',
+		} );
+	} );
+
+	describe( 'visibility change', () => {
+		it( 'does not spawn a duplicate poll when a request is in-flight', () => {
+			// Keep the first postSyncUpdate pending so we can simulate
+			// a visibility change while the request is in-flight.
+			const deferred = createDeferred< SyncResponse >();
+			mockPostSyncUpdate.mockReturnValue( deferred.promise );
+
+			pollingManager.registerRoom( {
+				room: 'test-room',
+				doc: createMockDoc(),
+				awareness: createMockAwareness(),
+				log: jest.fn(),
+				onStatusChange: jest.fn(),
+				onSync: jest.fn(),
+			} );
+
+			// registerRoom → poll() → start() → postSyncUpdate (pending).
+			expect( mockPostSyncUpdate ).toHaveBeenCalledTimes( 1 );
+
+			// Simulate tab hidden → visible while the request is in-flight.
+			simulateVisibilityChange( 'hidden' );
+			simulateVisibilityChange( 'visible' );
+
+			// No second poll should have been spawned.
+			expect( mockPostSyncUpdate ).toHaveBeenCalledTimes( 1 );
+		} );
+
+		it( 'repolls immediately when tab becomes visible with a pending timeout', async () => {
+			mockPostSyncUpdate.mockResolvedValue( syncResponse );
+
+			pollingManager.registerRoom( {
+				room: 'test-room',
+				doc: createMockDoc(),
+				awareness: createMockAwareness(),
+				log: jest.fn(),
+				onStatusChange: jest.fn(),
+				onSync: jest.fn(),
+			} );
+
+			// Flush so the first poll completes and schedules a timeout.
+			await jest.advanceTimersByTimeAsync( 0 );
+			expect( mockPostSyncUpdate ).toHaveBeenCalledTimes( 1 );
+
+			// Tab hidden → visible while a timeout is pending.
+			simulateVisibilityChange( 'hidden' );
+			simulateVisibilityChange( 'visible' );
+
+			// Should trigger an immediate repoll (not wait for timeout).
+			await jest.advanceTimersByTimeAsync( 0 );
+			expect( mockPostSyncUpdate ).toHaveBeenCalledTimes( 2 );
+		} );
+	} );
+} );

build-module/manager.mjs

@@ -19,2 +19,3 @@ // packages/sync/src/manager.ts
   deserializeCrdtDoc,
+  initializeYjsDoc,
   markEntityAsSaved,
@@ -131,2 +132,3 @@ serializeCrdtDoc
     stateMap.observe(onStateMapUpdate);
+    initializeYjsDoc(ydoc);
     internal.applyPersistedCrdtDoc(objectType, objectId, record);
@@ -196,2 +198,3 @@ }
     stateMap.observe(onStateMapUpdate);
+    initializeYjsDoc(ydoc);
   }
@@ -308,3 +311,3 @@ function unloadEntity(objectType, objectId) {
   }
-  function createPersistedCRDTDoc(objectType, objectId) {
+  async function createPersistedCRDTDoc(objectType, objectId) {
     const entityId = getEntityId(objectType, objectId);
@@ -315,2 +318,3 @@ const entityState = entityStates.get(entityId);
     }
+    await new Promise((resolve) => setTimeout(resolve, 0));
     return serializeCrdtDoc(entityState.ydoc);
@@ -317,0 +321,0 @@ }

build-module/manager.mjs.map

 {
   "version": 3,
   "sources": ["../src/manager.ts"],
-  "sourcesContent": ["/**\n * External dependencies\n */\nimport * as Y from 'yjs';\nimport type { Awareness } from 'y-protocols/awareness';\n\n/**\n * Internal dependencies\n */\nimport {\n\tCRDT_RECORD_MAP_KEY,\n\tCRDT_STATE_MAP_KEY,\n\tCRDT_STATE_MAP_SAVED_AT_KEY as SAVED_AT_KEY,\n\tLOCAL_SYNC_MANAGER_ORIGIN,\n} from './config';\nimport {\n\tlogPerformanceTiming,\n\tpassThru,\n\tyieldToEventLoop,\n} from './performance';\nimport { getProviderCreators } from './providers';\nimport type {\n\tCollectionHandlers,\n\tCRDTDoc,\n\tEntityID,\n\tObjectID,\n\tObjectData,\n\tObjectType,\n\tProviderCreator,\n\tRecordHandlers,\n\tSyncConfig,\n\tSyncManager,\n\tSyncManagerUpdateOptions,\n\tSyncUndoManager,\n} from './types';\nimport { createUndoManager } from './undo-manager';\nimport {\n\tcreateYjsDoc,\n\tdeserializeCrdtDoc,\n\tmarkEntityAsSaved,\n\tserializeCrdtDoc,\n} from './utils';\n\ninterface CollectionState {\n\tawareness?: Awareness;\n\thandlers: CollectionHandlers;\n\tsyncConfig: SyncConfig;\n\tunload: () => void;\n\tydoc: CRDTDoc;\n}\n\ninterface EntityState {\n\tawareness?: Awareness;\n\thandlers: RecordHandlers;\n\tobjectId: ObjectID;\n\tobjectType: ObjectType;\n\tsyncConfig: SyncConfig;\n\tunload: () => void;\n\tydoc: CRDTDoc;\n}\n\n/**\n * Get the entity ID for the given object type and object ID.\n *\n * @param {ObjectType}    objectType Object type.\n * @param {ObjectID|null} objectId   Object ID.\n */\nfunction getEntityId(\n\tobjectType: ObjectType,\n\tobjectId: ObjectID | null\n): EntityID {\n\treturn `${ objectType }_${ objectId }`;\n}\n\n/**\n * The sync manager orchestrates the lifecycle of syncing entity records. It\n * creates Yjs documents, connects to providers, creates awareness instances,\n * and coordinates with the `core-data` store.\n *\n * @param debug Whether to enable performance and debug logging.\n */\nexport function createSyncManager( debug = false ): SyncManager {\n\tconst debugWrap = debug ? logPerformanceTiming : passThru;\n\tconst collectionStates: Map< ObjectType, CollectionState > = new Map();\n\tconst entityStates: Map< EntityID, EntityState > = new Map();\n\n\t/**\n\t * A \"sync-aware\" undo manager for all synced entities. It is lazily created\n\t * when the first entity is loaded.\n\t *\n\t * IMPORTANT: In Gutenberg, the undo manager is effectively global and manages\n\t * undo/redo state for all entities. If the default WPUndoManager is used,\n\t * changes to entities are recorded in the `editEntityRecord` action:\n\t *\n\t * https://github.com/WordPress/gutenberg/blob/b63451e26e3c91b6bb291a2f9994722e3850417e/packages/core-data/src/actions.js#L428-L442\n\t *\n\t * In contrast, the `SyncUndoManager` only manages undo/redo for entities that\n\t * **are being synced by this sync manager**. The `addRecord` method is still\n\t * called in the code linked above, but it is a no-op. Yjs automatically tracks\n\t * changes to entities via the associated CRDT doc:\n\t *\n\t * https://github.com/WordPress/gutenberg/blob/b63451e26e3c91b6bb291a2f9994722e3850417e/packages/sync/src/undo-manager.ts#L42-L48\n\t *\n\t * This means that if at least one entity is being synced, then undo/redo\n\t * operations will be **restricted to synced entities only.**\n\t *\n\t * We could improve the `SyncUndoManager` to also track non-synced entities by\n\t * delegating to a secondary `WPUndoManager`, but this would add complexity\n\t * since we would need to maintain two separate undo/redo stacks and ensure\n\t * that they retain ordering and integrity.\n\t *\n\t * However, we also anticipate that most entities being edited in Gutenberg\n\t * will be synced entities (e.g. posts, pages, templates, template parts,\n\t * etc.), so this limitation may be temporary.\n\t */\n\tlet undoManager: SyncUndoManager | undefined;\n\n\t/**\n\t * Log debug messages if debugging is enabled.\n\t *\n\t * @param component The component or context related to the log message\n\t * @param message   The debug message\n\t * @param entityId  The entity ID related to the log message\n\t * @param context   Additional debug context\n\t */\n\tfunction log(\n\t\tcomponent: string,\n\t\tmessage: string,\n\t\tentityId: string,\n\t\tcontext: object = {}\n\t): void {\n\t\tif ( ! debug ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// eslint-disable-next-line no-console\n\t\tconsole.log( `[SyncManager][${ component }]: ${ message }`, {\n\t\t\t...context,\n\t\t\tentityId,\n\t\t} );\n\t}\n\n\t/**\n\t * Load an entity for syncing and manage its lifecycle.\n\t *\n\t * @param {SyncConfig}     syncConfig Sync configuration for the object type.\n\t * @param {ObjectType}     objectType Object type.\n\t * @param {ObjectID}       objectId   Object ID.\n\t * @param {ObjectData}     record     Entity record representing this object type.\n\t * @param {RecordHandlers} handlers   Handlers for updating and fetching the record.\n\t */\n\tasync function loadEntity(\n\t\tsyncConfig: SyncConfig,\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID,\n\t\trecord: ObjectData,\n\t\thandlers: RecordHandlers\n\t): Promise< void > {\n\t\tconst providerCreators = getProviderCreators();\n\t\tconst entityId = getEntityId( objectType, objectId );\n\n\t\tif ( 0 === providerCreators.length ) {\n\t\t\tlog( 'loadEntity', 'no providers, skipping', entityId );\n\t\t\treturn; // No provider creators, so syncing is effectively disabled.\n\t\t}\n\n\t\tif ( entityStates.has( entityId ) ) {\n\t\t\tlog( 'loadEntity', 'already loaded', entityId );\n\t\t\treturn; // Already bootstrapped.\n\t\t}\n\n\t\tlog( 'loadEntity', 'loading', entityId );\n\n\t\thandlers = {\n\t\t\taddUndoMeta: debugWrap( handlers.addUndoMeta ),\n\t\t\teditRecord: debugWrap( handlers.editRecord ),\n\t\t\tgetEditedRecord: debugWrap( handlers.getEditedRecord ),\n\t\t\tonStatusChange: debugWrap( handlers.onStatusChange ),\n\t\t\trefetchRecord: debugWrap( handlers.refetchRecord ),\n\t\t\trestoreUndoMeta: debugWrap( handlers.restoreUndoMeta ),\n\t\t\tsaveRecord: debugWrap( handlers.saveRecord ),\n\t\t};\n\n\t\tconst ydoc = createYjsDoc( { objectType } );\n\t\tconst recordMap = ydoc.getMap( CRDT_RECORD_MAP_KEY );\n\t\tconst stateMap = ydoc.getMap( CRDT_STATE_MAP_KEY );\n\t\tconst now = Date.now();\n\n\t\t// Clean up providers and in-memory state when the entity is unloaded.\n\t\tconst unload = (): void => {\n\t\t\tlog( 'loadEntity', 'unloading', entityId );\n\t\t\tproviderResults.forEach( ( result ) => result.destroy() );\n\t\t\thandlers.onStatusChange( null );\n\t\t\trecordMap.unobserveDeep( onRecordUpdate );\n\t\t\tstateMap.unobserve( onStateMapUpdate );\n\t\t\tydoc.destroy();\n\t\t\tentityStates.delete( entityId );\n\t\t};\n\n\t\t// If the sync config supports awareness, create it.\n\t\tconst awareness = syncConfig.createAwareness?.( ydoc, objectId );\n\n\t\t// When the CRDT document is updated by an UndoManager or a connection (not\n\t\t// a local origin), update the local store.\n\t\tconst onRecordUpdate = (\n\t\t\t_events: Y.YEvent< any >[],\n\t\t\ttransaction: Y.Transaction\n\t\t): void => {\n\t\t\tif (\n\t\t\t\ttransaction.local &&\n\t\t\t\t! ( transaction.origin instanceof Y.UndoManager )\n\t\t\t) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tvoid internal.updateEntityRecord( objectType, objectId );\n\t\t};\n\n\t\tconst onStateMapUpdate = (\n\t\t\tevent: Y.YMapEvent< unknown >,\n\t\t\ttransaction: Y.Transaction\n\t\t) => {\n\t\t\tif ( transaction.local ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tevent.keysChanged.forEach( ( key ) => {\n\t\t\t\tswitch ( key ) {\n\t\t\t\t\tcase SAVED_AT_KEY:\n\t\t\t\t\t\tconst newValue = stateMap.get( SAVED_AT_KEY );\n\t\t\t\t\t\tif ( 'number' === typeof newValue && newValue > now ) {\n\t\t\t\t\t\t\t// Another peer has saved the record. Refetch it so that we have\n\t\t\t\t\t\t\t// a correct understanding of our own unsaved edits.\n\t\t\t\t\t\t\tlog( 'loadEntity', 'refetching record', entityId );\n\t\t\t\t\t\t\tvoid handlers.refetchRecord().catch( () => {} );\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t} );\n\t\t};\n\n\t\t// Lazily create the undo manager when the first entity is loaded.\n\t\tif ( ! undoManager ) {\n\t\t\tundoManager = createUndoManager();\n\t\t}\n\n\t\tconst { addUndoMeta, restoreUndoMeta } = handlers;\n\t\tundoManager.addToScope( recordMap, {\n\t\t\taddUndoMeta,\n\t\t\trestoreUndoMeta,\n\t\t} );\n\n\t\tconst entityState: EntityState = {\n\t\t\tawareness,\n\t\t\thandlers,\n\t\t\tobjectId,\n\t\t\tobjectType,\n\t\t\tsyncConfig,\n\t\t\tunload,\n\t\t\tydoc,\n\t\t};\n\n\t\tentityStates.set( entityId, entityState );\n\n\t\t// Create providers for the given entity and its Yjs document.\n\t\tlog( 'loadEntity', 'connecting', entityId );\n\t\tconst providerResults = await Promise.all(\n\t\t\tproviderCreators.map( async ( create ) => {\n\t\t\t\tconst provider = await create( {\n\t\t\t\t\tobjectType,\n\t\t\t\t\tobjectId,\n\t\t\t\t\tydoc,\n\t\t\t\t\tawareness,\n\t\t\t\t} );\n\n\t\t\t\t// Attach status listener after provider creation.\n\t\t\t\tprovider.on( 'status', handlers.onStatusChange );\n\n\t\t\t\treturn provider;\n\t\t\t} )\n\t\t);\n\n\t\t// Attach observers.\n\t\trecordMap.observeDeep( onRecordUpdate );\n\t\tstateMap.observe( onStateMapUpdate );\n\n\t\t// Get and apply the persisted CRDT document, if it exists.\n\t\tinternal.applyPersistedCrdtDoc( objectType, objectId, record );\n\t}\n\n\t/**\n\t * Load a collection for syncing and manage its lifecycle.\n\t *\n\t * @param {SyncConfig}         syncConfig Sync configuration for the object type.\n\t * @param {ObjectType}         objectType Object type.\n\t * @param {CollectionHandlers} handlers   Handlers for updating the collection.\n\t */\n\tasync function loadCollection(\n\t\tsyncConfig: SyncConfig,\n\t\tobjectType: ObjectType,\n\t\thandlers: CollectionHandlers\n\t): Promise< void > {\n\t\tconst providerCreators: ProviderCreator[] = getProviderCreators();\n\t\tconst entityId = getEntityId( objectType, null );\n\n\t\tif ( 0 === providerCreators.length ) {\n\t\t\tlog( 'loadCollection', 'no providers, skipping', entityId );\n\t\t\treturn; // No provider creators, so syncing is effectively disabled.\n\t\t}\n\n\t\tif ( collectionStates.has( objectType ) ) {\n\t\t\tlog( 'loadCollection', 'already loaded', entityId );\n\t\t\treturn; // Already loaded.\n\t\t}\n\n\t\tlog( 'loadCollection', 'loading', entityId );\n\n\t\tconst ydoc = createYjsDoc( { collection: true, objectType } );\n\t\tconst stateMap = ydoc.getMap( CRDT_STATE_MAP_KEY );\n\t\tconst now = Date.now();\n\n\t\t// Clean up providers and in-memory state when the entity is unloaded.\n\t\tconst unload = (): void => {\n\t\t\tlog( 'loadCollection', 'unloading', entityId );\n\t\t\tproviderResults.forEach( ( result ) => result.destroy() );\n\t\t\thandlers.onStatusChange( null );\n\t\t\tstateMap.unobserve( onStateMapUpdate );\n\t\t\tydoc.destroy();\n\t\t\tcollectionStates.delete( objectType );\n\t\t};\n\n\t\tconst onStateMapUpdate = (\n\t\t\tevent: Y.YMapEvent< unknown >,\n\t\t\ttransaction: Y.Transaction\n\t\t) => {\n\t\t\tif ( transaction.local ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tevent.keysChanged.forEach( ( key ) => {\n\t\t\t\tswitch ( key ) {\n\t\t\t\t\tcase SAVED_AT_KEY:\n\t\t\t\t\t\tconst newValue = stateMap.get( SAVED_AT_KEY );\n\t\t\t\t\t\tif ( 'number' === typeof newValue && newValue > now ) {\n\t\t\t\t\t\t\t// Another peer has mutated the collection. Refetch it so that we\n\t\t\t\t\t\t\t// obtain the updated records.\n\t\t\t\t\t\t\tvoid handlers.refetchRecords().catch( () => {} );\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t} );\n\t\t};\n\n\t\t// If the sync config supports awareness, create it.\n\t\tconst awareness = syncConfig.createAwareness?.( ydoc );\n\n\t\tconst collectionState: CollectionState = {\n\t\t\tawareness,\n\t\t\thandlers,\n\t\t\tsyncConfig,\n\t\t\tunload,\n\t\t\tydoc,\n\t\t};\n\n\t\tcollectionStates.set( objectType, collectionState );\n\n\t\t// Create providers for the given entity and its Yjs document.\n\t\tlog( 'loadCollection', 'connecting', entityId );\n\t\tconst providerResults = await Promise.all(\n\t\t\tproviderCreators.map( async ( create ) => {\n\t\t\t\tconst provider = await create( {\n\t\t\t\t\tawareness,\n\t\t\t\t\tobjectType,\n\t\t\t\t\tobjectId: null,\n\t\t\t\t\tydoc,\n\t\t\t\t} );\n\n\t\t\t\t// Attach status listener after provider creation.\n\t\t\t\tprovider.on( 'status', handlers.onStatusChange );\n\n\t\t\t\treturn provider;\n\t\t\t} )\n\t\t);\n\n\t\t// Attach observers.\n\t\tstateMap.observe( onStateMapUpdate );\n\t}\n\n\t/**\n\t * Unload an entity, stop syncing, destroy its in-memory state, and trigger an\n\t * update of the collection.\n\t *\n\t * @param {ObjectType} objectType Object type to discard.\n\t * @param {ObjectID}   objectId   Object ID to discard, or null for collections.\n\t */\n\tfunction unloadEntity( objectType: ObjectType, objectId: ObjectID ): void {\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tlog( 'unloadEntity', 'unloading', entityId );\n\t\tentityStates.get( entityId )?.unload();\n\t\tupdateCRDTDoc( objectType, null, {}, origin, { isSave: true } );\n\t}\n\n\t/**\n\t * Get the awareness instance for the given object type and object ID, if supported.\n\t *\n\t * @template {Awareness} State\n\t * @param {ObjectType} objectType Object type.\n\t * @param {ObjectID}   objectId   Object ID.\n\t * @return {State | undefined} The awareness instance, or undefined if not supported.\n\t */\n\tfunction getAwareness< State extends Awareness >(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID\n\t): State | undefined {\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tconst entityState = entityStates.get( entityId );\n\n\t\tif ( ! entityState || ! entityState.awareness ) {\n\t\t\treturn undefined;\n\t\t}\n\n\t\treturn entityState.awareness as State;\n\t}\n\n\t/**\n\t * Load and inspect the persisted CRDT document. If supported and it exists,\n\t * compare it against the current entity record. If there are differences,\n\t * apply the changes from the entity record.\n\t *\n\t * @param {ObjectType} objectType Object type.\n\t * @param {ObjectID}   objectId   Object ID.\n\t * @param {ObjectData} record     Entity record representing this object type.\n\t */\n\tfunction _applyPersistedCrdtDoc(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID,\n\t\trecord: ObjectData\n\t): void {\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tconst entityState = entityStates.get( entityId );\n\n\t\tif ( ! entityState ) {\n\t\t\tlog( 'applyPersistedCrdtDoc', 'no entity state', entityId );\n\t\t\treturn;\n\t\t}\n\n\t\tconst {\n\t\t\thandlers,\n\t\t\tsyncConfig: {\n\t\t\t\tapplyChangesToCRDTDoc,\n\t\t\t\tgetChangesFromCRDTDoc,\n\t\t\t\tgetPersistedCRDTDoc,\n\t\t\t},\n\t\t\tydoc: targetDoc,\n\t\t} = entityState;\n\n\t\t// Get the persisted CRDT document, if it exists.\n\t\tconst serialized = getPersistedCRDTDoc?.( record );\n\t\tconst tempDoc = serialized ? deserializeCrdtDoc( serialized ) : null;\n\n\t\tif ( ! tempDoc ) {\n\t\t\tlog( 'applyPersistedCrdtDoc', 'no persisted doc', entityId );\n\t\t\t// Apply the current record as changes and trigger a save, which will\n\t\t\t// persist the CRDT document. (The entity should call `createPersistedCRDTDoc`\n\t\t\t// via its pre-persist hook.)\n\t\t\ttargetDoc.transact( () => {\n\t\t\t\tapplyChangesToCRDTDoc( targetDoc, record );\n\t\t\t\thandlers.saveRecord();\n\t\t\t}, LOCAL_SYNC_MANAGER_ORIGIN );\n\t\t\treturn;\n\t\t}\n\n\t\t// Apply the persisted document to the current document as a single update.\n\t\t// This is done even if the persisted document has been invalidated. This\n\t\t// prevents a newly joining peer (or refreshing user) from re-initializing\n\t\t// the CRDT document (the \"initialization problem\").\n\t\t//\n\t\t// IMPORTANT: Do not wrap this in a transaction with the local origin. It\n\t\t// effectively advances the state vector for the current client, which causes\n\t\t// Yjs to think that another client is using this client ID.\n\t\tconst update = Y.encodeStateAsUpdateV2( tempDoc );\n\t\tY.applyUpdateV2( targetDoc, update );\n\n\t\t// Compute the differences between the persisted doc and the current\n\t\t// record. This can happen when:\n\t\t//\n\t\t// 1. The server makes updates on save that mutate the entity. Example: On\n\t\t//    initial save, the server adds the \"Uncategorized\" category to the\n\t\t//    post.\n\t\t// 2. An \"out-of-band\" update occurs. Example: a WP-CLI command or direct\n\t\t//    database update mutates the entity.\n\t\t// 3. Unsaved changes are synced from a peer _before_ this code runs. We\n\t\t//    can't control when (or if) remote changes are synced, so this is a\n\t\t//    race condition.\n\t\tconst invalidations = getChangesFromCRDTDoc( tempDoc, record );\n\t\tconst invalidatedKeys = Object.keys( invalidations );\n\n\t\t// Destroy the temporary document to prevent leaks.\n\t\ttempDoc.destroy();\n\n\t\tif ( 0 === invalidatedKeys.length ) {\n\t\t\tlog( 'applyPersistedCrdtDoc', 'valid persisted doc', entityId );\n\t\t\t// The persisted CRDT document is valid. There are no updates to apply.\n\t\t\treturn;\n\t\t}\n\n\t\tlog( 'applyPersistedCrdtDoc', 'invalidated keys', entityId, {\n\t\t\tinvalidatedKeys,\n\t\t} );\n\n\t\t// Use the invalidated keys to get the updated values from the entity.\n\t\tconst changes = invalidatedKeys.reduce(\n\t\t\t( acc, key ) =>\n\t\t\t\tObject.assign( acc, {\n\t\t\t\t\t[ key ]: record[ key ],\n\t\t\t\t} ),\n\t\t\t{}\n\t\t);\n\n\t\t// Apply the changes and trigger a save, which will persist the CRDT\n\t\t// document. (The entity should call `createPersistedCRDTDoc` via its\n\t\t// pre-persist hook.)\n\t\ttargetDoc.transact( () => {\n\t\t\tapplyChangesToCRDTDoc( targetDoc, changes );\n\t\t\thandlers.saveRecord();\n\t\t}, LOCAL_SYNC_MANAGER_ORIGIN );\n\t}\n\n\t/**\n\t * Update CRDT document with changes from the local store.\n\t *\n\t * @param {ObjectType}               objectType             Object type.\n\t * @param {ObjectID}                 objectId               Object ID.\n\t * @param {Partial< ObjectData >}    changes                Updates to make.\n\t * @param {string}                   origin                 The source of change.\n\t * @param {SyncManagerUpdateOptions} options                Optional flags for the update.\n\t * @param {boolean}                  options.isSave         Whether this update is part of a save operation. Defaults to false.\n\t * @param {boolean}                  options.isNewUndoLevel Whether to create a new undo level for this change. Defaults to false.\n\t */\n\tfunction updateCRDTDoc(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID | null,\n\t\tchanges: Partial< ObjectData >,\n\t\torigin: string,\n\t\toptions: SyncManagerUpdateOptions = {}\n\t): void {\n\t\tconst { isSave = false, isNewUndoLevel = false } = options;\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tconst entityState = entityStates.get( entityId );\n\t\tconst collectionState = collectionStates.get( objectType );\n\n\t\tif ( entityState ) {\n\t\t\tconst { syncConfig, ydoc } = entityState;\n\n\t\t\t// If this is change should create a new undo level, tell the undo\n\t\t\t// manager to stop capturing and create a new undo group.\n\t\t\t// We can't do this in the undo manager itself, because addRecord() is\n\t\t\t// called after the CRDT changes have been applied, and we want to\n\t\t\t// ensure that the undo set is created before the changes are applied.\n\t\t\tif ( isNewUndoLevel && undoManager ) {\n\t\t\t\tundoManager.stopCapturing?.();\n\t\t\t}\n\n\t\t\tydoc.transact( () => {\n\t\t\t\tlog( 'updateCRDTDoc', 'applying changes', entityId, {\n\t\t\t\t\tchangedKeys: Object.keys( changes ),\n\t\t\t\t} );\n\t\t\t\tsyncConfig.applyChangesToCRDTDoc( ydoc, changes );\n\n\t\t\t\tif ( isSave ) {\n\t\t\t\t\tmarkEntityAsSaved( ydoc );\n\t\t\t\t}\n\t\t\t}, origin );\n\t\t}\n\n\t\tif ( collectionState && isSave ) {\n\t\t\tcollectionState.ydoc.transact( () => {\n\t\t\t\tmarkEntityAsSaved( collectionState.ydoc );\n\t\t\t}, origin );\n\t\t}\n\t}\n\n\t/**\n\t * Update the entity record in the local store with changes from the CRDT\n\t * document.\n\t *\n\t * @param {ObjectType} objectType Object type of record to update.\n\t * @param {ObjectID}   objectId   Object ID of record to update.\n\t */\n\tasync function _updateEntityRecord(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID\n\t): Promise< void > {\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tconst entityState = entityStates.get( entityId );\n\n\t\tif ( ! entityState ) {\n\t\t\tlog( 'updateEntityRecord', 'no entity state', entityId );\n\t\t\treturn;\n\t\t}\n\n\t\tconst { handlers, syncConfig, ydoc } = entityState;\n\n\t\t// Determine which synced properties have actually changed by comparing\n\t\t// them against the current edited entity record.\n\t\tconst changes = syncConfig.getChangesFromCRDTDoc(\n\t\t\tydoc,\n\t\t\tawait handlers.getEditedRecord()\n\t\t);\n\n\t\tconst changedKeys = Object.keys( changes );\n\n\t\tif ( 0 === changedKeys.length ) {\n\t\t\treturn;\n\t\t}\n\n\t\tlog( 'updateEntityRecord', 'changes', entityId, {\n\t\t\tchangedKeys,\n\t\t} );\n\t\thandlers.editRecord( changes );\n\t}\n\n\t/**\n\t * Create object meta to persist the CRDT document in the entity record.\n\t *\n\t * @param {ObjectType} objectType Object type.\n\t * @param {ObjectID}   objectId   Object ID.\n\t */\n\tfunction createPersistedCRDTDoc(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID\n\t): string | null {\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tconst entityState = entityStates.get( entityId );\n\n\t\tif ( ! entityState?.ydoc ) {\n\t\t\treturn null;\n\t\t}\n\n\t\treturn serializeCrdtDoc( entityState.ydoc );\n\t}\n\n\t// Collect internal functions so that they can be wrapped before calling.\n\tconst internal = {\n\t\tapplyPersistedCrdtDoc: debugWrap( _applyPersistedCrdtDoc ),\n\t\tupdateEntityRecord: debugWrap( _updateEntityRecord ),\n\t};\n\n\t// Wrap and return the public API.\n\treturn {\n\t\tcreatePersistedCRDTDoc: debugWrap( createPersistedCRDTDoc ),\n\t\tgetAwareness,\n\t\tload: debugWrap( loadEntity ),\n\t\tloadCollection: debugWrap( loadCollection ),\n\t\t// Use getter to ensure we always return the current value of `undoManager`.\n\t\tget undoManager(): SyncUndoManager | undefined {\n\t\t\treturn undoManager;\n\t\t},\n\t\tunload: debugWrap( unloadEntity ),\n\t\tupdate: debugWrap( yieldToEventLoop( updateCRDTDoc ) ),\n\t};\n}\n"],
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It\n * creates Yjs documents, connects to providers, creates awareness instances,\n * and coordinates with the `core-data` store.\n *\n * @param debug Whether to enable performance and debug logging.\n */\nexport function createSyncManager( debug = false ): SyncManager {\n\tconst debugWrap = debug ? logPerformanceTiming : passThru;\n\tconst collectionStates: Map< ObjectType, CollectionState > = new Map();\n\tconst entityStates: Map< EntityID, EntityState > = new Map();\n\n\t/**\n\t * A \"sync-aware\" undo manager for all synced entities. It is lazily created\n\t * when the first entity is loaded.\n\t *\n\t * IMPORTANT: In Gutenberg, the undo manager is effectively global and manages\n\t * undo/redo state for all entities. If the default WPUndoManager is used,\n\t * changes to entities are recorded in the `editEntityRecord` action:\n\t *\n\t * https://github.com/WordPress/gutenberg/blob/b63451e26e3c91b6bb291a2f9994722e3850417e/packages/core-data/src/actions.js#L428-L442\n\t *\n\t * In contrast, the `SyncUndoManager` only manages undo/redo for entities that\n\t * **are being synced by this sync manager**. The `addRecord` method is still\n\t * called in the code linked above, but it is a no-op. Yjs automatically tracks\n\t * changes to entities via the associated CRDT doc:\n\t *\n\t * https://github.com/WordPress/gutenberg/blob/b63451e26e3c91b6bb291a2f9994722e3850417e/packages/sync/src/undo-manager.ts#L42-L48\n\t *\n\t * This means that if at least one entity is being synced, then undo/redo\n\t * operations will be **restricted to synced entities only.**\n\t *\n\t * We could improve the `SyncUndoManager` to also track non-synced entities by\n\t * delegating to a secondary `WPUndoManager`, but this would add complexity\n\t * since we would need to maintain two separate undo/redo stacks and ensure\n\t * that they retain ordering and integrity.\n\t *\n\t * However, we also anticipate that most entities being edited in Gutenberg\n\t * will be synced entities (e.g. posts, pages, templates, template parts,\n\t * etc.), so this limitation may be temporary.\n\t */\n\tlet undoManager: SyncUndoManager | undefined;\n\n\t/**\n\t * Log debug messages if debugging is enabled.\n\t *\n\t * @param component The component or context related to the log message\n\t * @param message   The debug message\n\t * @param entityId  The entity ID related to the log message\n\t * @param context   Additional debug context\n\t */\n\tfunction log(\n\t\tcomponent: string,\n\t\tmessage: string,\n\t\tentityId: string,\n\t\tcontext: object = {}\n\t): void {\n\t\tif ( ! debug ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// eslint-disable-next-line no-console\n\t\tconsole.log( `[SyncManager][${ component }]: ${ message }`, {\n\t\t\t...context,\n\t\t\tentityId,\n\t\t} );\n\t}\n\n\t/**\n\t * Load an entity for syncing and manage its lifecycle.\n\t *\n\t * @param {SyncConfig}     syncConfig Sync configuration for the object type.\n\t * @param {ObjectType}     objectType Object type.\n\t * @param {ObjectID}       objectId   Object ID.\n\t * @param {ObjectData}     record     Entity record representing this object type.\n\t * @param {RecordHandlers} handlers   Handlers for updating and fetching the record.\n\t */\n\tasync function loadEntity(\n\t\tsyncConfig: SyncConfig,\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID,\n\t\trecord: ObjectData,\n\t\thandlers: RecordHandlers\n\t): Promise< void > {\n\t\tconst providerCreators = getProviderCreators();\n\t\tconst entityId = getEntityId( objectType, objectId );\n\n\t\tif ( 0 === providerCreators.length ) {\n\t\t\tlog( 'loadEntity', 'no providers, skipping', entityId );\n\t\t\treturn; // No provider creators, so syncing is effectively disabled.\n\t\t}\n\n\t\tif ( entityStates.has( entityId ) ) {\n\t\t\tlog( 'loadEntity', 'already loaded', entityId );\n\t\t\treturn; // Already bootstrapped.\n\t\t}\n\n\t\tlog( 'loadEntity', 'loading', entityId );\n\n\t\thandlers = {\n\t\t\taddUndoMeta: debugWrap( handlers.addUndoMeta ),\n\t\t\teditRecord: debugWrap( handlers.editRecord ),\n\t\t\tgetEditedRecord: debugWrap( handlers.getEditedRecord ),\n\t\t\tonStatusChange: debugWrap( handlers.onStatusChange ),\n\t\t\trefetchRecord: debugWrap( handlers.refetchRecord ),\n\t\t\trestoreUndoMeta: debugWrap( handlers.restoreUndoMeta ),\n\t\t\tsaveRecord: debugWrap( handlers.saveRecord ),\n\t\t};\n\n\t\tconst ydoc = createYjsDoc( { objectType } );\n\t\tconst recordMap = ydoc.getMap( CRDT_RECORD_MAP_KEY );\n\t\tconst stateMap = ydoc.getMap( CRDT_STATE_MAP_KEY );\n\t\tconst now = Date.now();\n\n\t\t// Clean up providers and in-memory state when the entity is unloaded.\n\t\tconst unload = (): void => {\n\t\t\tlog( 'loadEntity', 'unloading', entityId );\n\t\t\tproviderResults.forEach( ( result ) => result.destroy() );\n\t\t\thandlers.onStatusChange( null );\n\t\t\trecordMap.unobserveDeep( onRecordUpdate );\n\t\t\tstateMap.unobserve( onStateMapUpdate );\n\t\t\tydoc.destroy();\n\t\t\tentityStates.delete( entityId );\n\t\t};\n\n\t\t// If the sync config supports awareness, create it.\n\t\tconst awareness = syncConfig.createAwareness?.( ydoc, objectId );\n\n\t\t// When the CRDT document is updated by an UndoManager or a connection (not\n\t\t// a local origin), update the local store.\n\t\tconst onRecordUpdate = (\n\t\t\t_events: Y.YEvent< any >[],\n\t\t\ttransaction: Y.Transaction\n\t\t): void => {\n\t\t\tif (\n\t\t\t\ttransaction.local &&\n\t\t\t\t! ( transaction.origin instanceof Y.UndoManager )\n\t\t\t) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tvoid internal.updateEntityRecord( objectType, objectId );\n\t\t};\n\n\t\tconst onStateMapUpdate = (\n\t\t\tevent: Y.YMapEvent< unknown >,\n\t\t\ttransaction: Y.Transaction\n\t\t) => {\n\t\t\tif ( transaction.local ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tevent.keysChanged.forEach( ( key ) => {\n\t\t\t\tswitch ( key ) {\n\t\t\t\t\tcase SAVED_AT_KEY:\n\t\t\t\t\t\tconst newValue = stateMap.get( SAVED_AT_KEY );\n\t\t\t\t\t\tif ( 'number' === typeof newValue && newValue > now ) {\n\t\t\t\t\t\t\t// Another peer has saved the record. Refetch it so that we have\n\t\t\t\t\t\t\t// a correct understanding of our own unsaved edits.\n\t\t\t\t\t\t\tlog( 'loadEntity', 'refetching record', entityId );\n\t\t\t\t\t\t\tvoid handlers.refetchRecord().catch( () => {} );\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t} );\n\t\t};\n\n\t\t// Lazily create the undo manager when the first entity is loaded.\n\t\tif ( ! undoManager ) {\n\t\t\tundoManager = createUndoManager();\n\t\t}\n\n\t\tconst { addUndoMeta, restoreUndoMeta } = handlers;\n\t\tundoManager.addToScope( recordMap, {\n\t\t\taddUndoMeta,\n\t\t\trestoreUndoMeta,\n\t\t} );\n\n\t\tconst entityState: EntityState = {\n\t\t\tawareness,\n\t\t\thandlers,\n\t\t\tobjectId,\n\t\t\tobjectType,\n\t\t\tsyncConfig,\n\t\t\tunload,\n\t\t\tydoc,\n\t\t};\n\n\t\tentityStates.set( entityId, entityState );\n\n\t\t// Create providers for the given entity and its Yjs document.\n\t\tlog( 'loadEntity', 'connecting', entityId );\n\t\tconst providerResults = await Promise.all(\n\t\t\tproviderCreators.map( async ( create ) => {\n\t\t\t\tconst provider = await create( {\n\t\t\t\t\tobjectType,\n\t\t\t\t\tobjectId,\n\t\t\t\t\tydoc,\n\t\t\t\t\tawareness,\n\t\t\t\t} );\n\n\t\t\t\t// Attach status listener after provider creation.\n\t\t\t\tprovider.on( 'status', handlers.onStatusChange );\n\n\t\t\t\treturn provider;\n\t\t\t} )\n\t\t);\n\n\t\t// Attach observers.\n\t\trecordMap.observeDeep( onRecordUpdate );\n\t\tstateMap.observe( onStateMapUpdate );\n\n\t\t// Initialize the Yjs document with the necessary CRDT state.\n\t\tinitializeYjsDoc( ydoc );\n\n\t\t// Get and apply the persisted CRDT document, if it exists.\n\t\tinternal.applyPersistedCrdtDoc( objectType, objectId, record );\n\t}\n\n\t/**\n\t * Load a collection for syncing and manage its lifecycle.\n\t *\n\t * @param {SyncConfig}         syncConfig Sync configuration for the object type.\n\t * @param {ObjectType}         objectType Object type.\n\t * @param {CollectionHandlers} handlers   Handlers for updating the collection.\n\t */\n\tasync function loadCollection(\n\t\tsyncConfig: SyncConfig,\n\t\tobjectType: ObjectType,\n\t\thandlers: CollectionHandlers\n\t): Promise< void > {\n\t\tconst providerCreators: ProviderCreator[] = getProviderCreators();\n\t\tconst entityId = getEntityId( objectType, null );\n\n\t\tif ( 0 === providerCreators.length ) {\n\t\t\tlog( 'loadCollection', 'no providers, skipping', entityId );\n\t\t\treturn; // No provider creators, so syncing is effectively disabled.\n\t\t}\n\n\t\tif ( collectionStates.has( objectType ) ) {\n\t\t\tlog( 'loadCollection', 'already loaded', entityId );\n\t\t\treturn; // Already loaded.\n\t\t}\n\n\t\tlog( 'loadCollection', 'loading', entityId );\n\n\t\tconst ydoc = createYjsDoc( { collection: true, objectType } );\n\t\tconst stateMap = ydoc.getMap( CRDT_STATE_MAP_KEY );\n\t\tconst now = Date.now();\n\n\t\t// Clean up providers and in-memory state when the entity is unloaded.\n\t\tconst unload = (): void => {\n\t\t\tlog( 'loadCollection', 'unloading', entityId );\n\t\t\tproviderResults.forEach( ( result ) => result.destroy() );\n\t\t\thandlers.onStatusChange( null );\n\t\t\tstateMap.unobserve( onStateMapUpdate );\n\t\t\tydoc.destroy();\n\t\t\tcollectionStates.delete( objectType );\n\t\t};\n\n\t\tconst onStateMapUpdate = (\n\t\t\tevent: Y.YMapEvent< unknown >,\n\t\t\ttransaction: Y.Transaction\n\t\t) => {\n\t\t\tif ( transaction.local ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tevent.keysChanged.forEach( ( key ) => {\n\t\t\t\tswitch ( key ) {\n\t\t\t\t\tcase SAVED_AT_KEY:\n\t\t\t\t\t\tconst newValue = stateMap.get( SAVED_AT_KEY );\n\t\t\t\t\t\tif ( 'number' === typeof newValue && newValue > now ) {\n\t\t\t\t\t\t\t// Another peer has mutated the collection. Refetch it so that we\n\t\t\t\t\t\t\t// obtain the updated records.\n\t\t\t\t\t\t\tvoid handlers.refetchRecords().catch( () => {} );\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t} );\n\t\t};\n\n\t\t// If the sync config supports awareness, create it.\n\t\tconst awareness = syncConfig.createAwareness?.( ydoc );\n\n\t\tconst collectionState: CollectionState = {\n\t\t\tawareness,\n\t\t\thandlers,\n\t\t\tsyncConfig,\n\t\t\tunload,\n\t\t\tydoc,\n\t\t};\n\n\t\tcollectionStates.set( objectType, collectionState );\n\n\t\t// Create providers for the given entity and its Yjs document.\n\t\tlog( 'loadCollection', 'connecting', entityId );\n\t\tconst providerResults = await Promise.all(\n\t\t\tproviderCreators.map( async ( create ) => {\n\t\t\t\tconst provider = await create( {\n\t\t\t\t\tawareness,\n\t\t\t\t\tobjectType,\n\t\t\t\t\tobjectId: null,\n\t\t\t\t\tydoc,\n\t\t\t\t} );\n\n\t\t\t\t// Attach status listener after provider creation.\n\t\t\t\tprovider.on( 'status', handlers.onStatusChange );\n\n\t\t\t\treturn provider;\n\t\t\t} )\n\t\t);\n\n\t\t// Attach observers.\n\t\tstateMap.observe( onStateMapUpdate );\n\n\t\t// Initialize the Yjs document with the necessary CRDT state.\n\t\tinitializeYjsDoc( ydoc );\n\t}\n\n\t/**\n\t * Unload an entity, stop syncing, destroy its in-memory state, and trigger an\n\t * update of the collection.\n\t *\n\t * @param {ObjectType} objectType Object type to discard.\n\t * @param {ObjectID}   objectId   Object ID to discard, or null for collections.\n\t */\n\tfunction unloadEntity( objectType: ObjectType, objectId: ObjectID ): void {\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tlog( 'unloadEntity', 'unloading', entityId );\n\t\tentityStates.get( entityId )?.unload();\n\t\tupdateCRDTDoc( objectType, null, {}, origin, { isSave: true } );\n\t}\n\n\t/**\n\t * Get the awareness instance for the given object type and object ID, if supported.\n\t *\n\t * @template {Awareness} State\n\t * @param {ObjectType} objectType Object type.\n\t * @param {ObjectID}   objectId   Object ID.\n\t * @return {State | undefined} The awareness instance, or undefined if not supported.\n\t */\n\tfunction getAwareness< State extends Awareness >(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID\n\t): State | undefined {\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tconst entityState = entityStates.get( entityId );\n\n\t\tif ( ! entityState || ! entityState.awareness ) {\n\t\t\treturn undefined;\n\t\t}\n\n\t\treturn entityState.awareness as State;\n\t}\n\n\t/**\n\t * Load and inspect the persisted CRDT document. If supported and it exists,\n\t * compare it against the current entity record. If there are differences,\n\t * apply the changes from the entity record.\n\t *\n\t * @param {ObjectType} objectType Object type.\n\t * @param {ObjectID}   objectId   Object ID.\n\t * @param {ObjectData} record     Entity record representing this object type.\n\t */\n\tfunction _applyPersistedCrdtDoc(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID,\n\t\trecord: ObjectData\n\t): void {\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tconst entityState = entityStates.get( entityId );\n\n\t\tif ( ! entityState ) {\n\t\t\tlog( 'applyPersistedCrdtDoc', 'no entity state', entityId );\n\t\t\treturn;\n\t\t}\n\n\t\tconst {\n\t\t\thandlers,\n\t\t\tsyncConfig: {\n\t\t\t\tapplyChangesToCRDTDoc,\n\t\t\t\tgetChangesFromCRDTDoc,\n\t\t\t\tgetPersistedCRDTDoc,\n\t\t\t},\n\t\t\tydoc: targetDoc,\n\t\t} = entityState;\n\n\t\t// Get the persisted CRDT document, if it exists.\n\t\tconst serialized = getPersistedCRDTDoc?.( record );\n\t\tconst tempDoc = serialized ? deserializeCrdtDoc( serialized ) : null;\n\n\t\tif ( ! tempDoc ) {\n\t\t\tlog( 'applyPersistedCrdtDoc', 'no persisted doc', entityId );\n\t\t\t// Apply the current record as changes and trigger a save, which will\n\t\t\t// persist the CRDT document. (The entity should call `createPersistedCRDTDoc`\n\t\t\t// via its pre-persist hook.)\n\t\t\ttargetDoc.transact( () => {\n\t\t\t\tapplyChangesToCRDTDoc( targetDoc, record );\n\t\t\t\thandlers.saveRecord();\n\t\t\t}, LOCAL_SYNC_MANAGER_ORIGIN );\n\t\t\treturn;\n\t\t}\n\n\t\t// Apply the persisted document to the current document as a single update.\n\t\t// This is done even if the persisted document has been invalidated. This\n\t\t// prevents a newly joining peer (or refreshing user) from re-initializing\n\t\t// the CRDT document (the \"initialization problem\").\n\t\t//\n\t\t// IMPORTANT: Do not wrap this in a transaction with the local origin. It\n\t\t// effectively advances the state vector for the current client, which causes\n\t\t// Yjs to think that another client is using this client ID.\n\t\tconst update = Y.encodeStateAsUpdateV2( tempDoc );\n\t\tY.applyUpdateV2( targetDoc, update );\n\n\t\t// Compute the differences between the persisted doc and the current\n\t\t// record. This can happen when:\n\t\t//\n\t\t// 1. The server makes updates on save that mutate the entity. Example: On\n\t\t//    initial save, the server adds the \"Uncategorized\" category to the\n\t\t//    post.\n\t\t// 2. An \"out-of-band\" update occurs. Example: a WP-CLI command or direct\n\t\t//    database update mutates the entity.\n\t\t// 3. Unsaved changes are synced from a peer _before_ this code runs. We\n\t\t//    can't control when (or if) remote changes are synced, so this is a\n\t\t//    race condition.\n\t\tconst invalidations = getChangesFromCRDTDoc( tempDoc, record );\n\t\tconst invalidatedKeys = Object.keys( invalidations );\n\n\t\t// Destroy the temporary document to prevent leaks.\n\t\ttempDoc.destroy();\n\n\t\tif ( 0 === invalidatedKeys.length ) {\n\t\t\tlog( 'applyPersistedCrdtDoc', 'valid persisted doc', entityId );\n\t\t\t// The persisted CRDT document is valid. There are no updates to apply.\n\t\t\treturn;\n\t\t}\n\n\t\tlog( 'applyPersistedCrdtDoc', 'invalidated keys', entityId, {\n\t\t\tinvalidatedKeys,\n\t\t} );\n\n\t\t// Use the invalidated keys to get the updated values from the entity.\n\t\tconst changes = invalidatedKeys.reduce(\n\t\t\t( acc, key ) =>\n\t\t\t\tObject.assign( acc, {\n\t\t\t\t\t[ key ]: record[ key ],\n\t\t\t\t} ),\n\t\t\t{}\n\t\t);\n\n\t\t// Apply the changes and trigger a save, which will persist the CRDT\n\t\t// document. (The entity should call `createPersistedCRDTDoc` via its\n\t\t// pre-persist hook.)\n\t\ttargetDoc.transact( () => {\n\t\t\tapplyChangesToCRDTDoc( targetDoc, changes );\n\t\t\thandlers.saveRecord();\n\t\t}, LOCAL_SYNC_MANAGER_ORIGIN );\n\t}\n\n\t/**\n\t * Update CRDT document with changes from the local store.\n\t *\n\t * @param {ObjectType}               objectType             Object type.\n\t * @param {ObjectID}                 objectId               Object ID.\n\t * @param {Partial< ObjectData >}    changes                Updates to make.\n\t * @param {string}                   origin                 The source of change.\n\t * @param {SyncManagerUpdateOptions} options                Optional flags for the update.\n\t * @param {boolean}                  options.isSave         Whether this update is part of a save operation. Defaults to false.\n\t * @param {boolean}                  options.isNewUndoLevel Whether to create a new undo level for this change. Defaults to false.\n\t */\n\tfunction updateCRDTDoc(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID | null,\n\t\tchanges: Partial< ObjectData >,\n\t\torigin: string,\n\t\toptions: SyncManagerUpdateOptions = {}\n\t): void {\n\t\tconst { isSave = false, isNewUndoLevel = false } = options;\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tconst entityState = entityStates.get( entityId );\n\t\tconst collectionState = collectionStates.get( objectType );\n\n\t\tif ( entityState ) {\n\t\t\tconst { syncConfig, ydoc } = entityState;\n\n\t\t\t// If this is change should create a new undo level, tell the undo\n\t\t\t// manager to stop capturing and create a new undo group.\n\t\t\t// We can't do this in the undo manager itself, because addRecord() is\n\t\t\t// called after the CRDT changes have been applied, and we want to\n\t\t\t// ensure that the undo set is created before the changes are applied.\n\t\t\tif ( isNewUndoLevel && undoManager ) {\n\t\t\t\tundoManager.stopCapturing?.();\n\t\t\t}\n\n\t\t\tydoc.transact( () => {\n\t\t\t\tlog( 'updateCRDTDoc', 'applying changes', entityId, {\n\t\t\t\t\tchangedKeys: Object.keys( changes ),\n\t\t\t\t} );\n\t\t\t\tsyncConfig.applyChangesToCRDTDoc( ydoc, changes );\n\n\t\t\t\tif ( isSave ) {\n\t\t\t\t\tmarkEntityAsSaved( ydoc );\n\t\t\t\t}\n\t\t\t}, origin );\n\t\t}\n\n\t\tif ( collectionState && isSave ) {\n\t\t\tcollectionState.ydoc.transact( () => {\n\t\t\t\tmarkEntityAsSaved( collectionState.ydoc );\n\t\t\t}, origin );\n\t\t}\n\t}\n\n\t/**\n\t * Update the entity record in the local store with changes from the CRDT\n\t * document.\n\t *\n\t * @param {ObjectType} objectType Object type of record to update.\n\t * @param {ObjectID}   objectId   Object ID of record to update.\n\t */\n\tasync function _updateEntityRecord(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID\n\t): Promise< void > {\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tconst entityState = entityStates.get( entityId );\n\n\t\tif ( ! entityState ) {\n\t\t\tlog( 'updateEntityRecord', 'no entity state', entityId );\n\t\t\treturn;\n\t\t}\n\n\t\tconst { handlers, syncConfig, ydoc } = entityState;\n\n\t\t// Determine which synced properties have actually changed by comparing\n\t\t// them against the current edited entity record.\n\t\tconst changes = syncConfig.getChangesFromCRDTDoc(\n\t\t\tydoc,\n\t\t\tawait handlers.getEditedRecord()\n\t\t);\n\n\t\tconst changedKeys = Object.keys( changes );\n\n\t\tif ( 0 === changedKeys.length ) {\n\t\t\treturn;\n\t\t}\n\n\t\tlog( 'updateEntityRecord', 'changes', entityId, {\n\t\t\tchangedKeys,\n\t\t} );\n\t\thandlers.editRecord( changes );\n\t}\n\n\t/**\n\t * Create object meta to persist the CRDT document in the entity record.\n\t *\n\t * @param {ObjectType} objectType Object type.\n\t * @param {ObjectID}   objectId   Object ID.\n\t */\n\tasync function createPersistedCRDTDoc(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID\n\t): Promise< string | null > {\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tconst entityState = entityStates.get( entityId );\n\n\t\tif ( ! entityState?.ydoc ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// Y.Doc updates are deferred via yieldToEventLoop. Await a promise that\n\t\t// resolves on the next tick of the event loop so pending updates are flushed\n\t\t// before we serialize the document.\n\t\tawait new Promise( ( resolve ) => setTimeout( resolve, 0 ) );\n\n\t\treturn serializeCrdtDoc( entityState.ydoc );\n\t}\n\n\t// Collect internal functions so that they can be wrapped before calling.\n\tconst internal = {\n\t\tapplyPersistedCrdtDoc: debugWrap( _applyPersistedCrdtDoc ),\n\t\tupdateEntityRecord: debugWrap( _updateEntityRecord ),\n\t};\n\n\t// Wrap and return the public API.\n\treturn {\n\t\tcreatePersistedCRDTDoc: debugWrap( createPersistedCRDTDoc ),\n\t\tgetAwareness,\n\t\tload: debugWrap( loadEntity ),\n\t\tloadCollection: debugWrap( loadCollection ),\n\t\t// Use getter to ensure we always return the current value of `undoManager`.\n\t\tget undoManager(): SyncUndoManager | undefined {\n\t\t\treturn undoManager;\n\t\t},\n\t\tunload: debugWrap( unloadEntity ),\n\t\tupdate: debugWrap( yieldToEventLoop( updateCRDTDoc ) ),\n\t};\n}\n"],
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   "names": ["origin"]
 }

build-module/private-apis.mjs

@@ -9,2 +9,3 @@ // packages/sync/src/private-apis.ts
 import { createSyncManager } from "./manager.mjs";
+import { pollingManager } from "./providers/http-polling/polling-manager.mjs";
 import { default as Delta } from "./quill-delta/Delta.mjs";
@@ -17,3 +18,4 @@ var privateApis = {};
   CRDT_RECORD_MAP_KEY,
-  LOCAL_EDITOR_ORIGIN
+  LOCAL_EDITOR_ORIGIN,
+  retrySyncConnection: () => pollingManager.retryNow()
 });
@@ -20,0 +22,0 @@ export {

build-module/private-apis.mjs.map

 {
   "version": 3,
   "sources": ["../src/private-apis.ts"],
-  "sourcesContent": ["/**\n * Internal dependencies\n */\nimport {\n\tCRDT_DOC_META_PERSISTENCE_KEY,\n\tCRDT_RECORD_MAP_KEY,\n\tLOCAL_EDITOR_ORIGIN,\n} from './config';\nimport { lock } from './lock-unlock';\nimport { createSyncManager } from './manager';\nimport { default as Delta } from './quill-delta/Delta';\n\nexport const privateApis = {};\n\nlock( privateApis, {\n\tcreateSyncManager,\n\tDelta,\n\tCRDT_DOC_META_PERSISTENCE_KEY,\n\tCRDT_RECORD_MAP_KEY,\n\tLOCAL_EDITOR_ORIGIN,\n} );\n"],
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+  "sourcesContent": ["/**\n * Internal dependencies\n */\nimport {\n\tCRDT_DOC_META_PERSISTENCE_KEY,\n\tCRDT_RECORD_MAP_KEY,\n\tLOCAL_EDITOR_ORIGIN,\n} from './config';\nimport { lock } from './lock-unlock';\nimport { createSyncManager } from './manager';\nimport { pollingManager } from './providers/http-polling/polling-manager';\nimport { default as Delta } from './quill-delta/Delta';\n\nexport const privateApis = {};\n\nlock( privateApis, {\n\tcreateSyncManager,\n\tDelta,\n\tCRDT_DOC_META_PERSISTENCE_KEY,\n\tCRDT_RECORD_MAP_KEY,\n\tLOCAL_EDITOR_ORIGIN,\n\tretrySyncConnection: () => pollingManager.retryNow(),\n} );\n"],
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   "names": []
 }

build-module/provi.../http-polling/http-polling-provider.mjs

@@ -46,9 +46,10 @@ // packages/sync/src/providers/http-polling/http-polling-provider.ts
   /**
-   * Emit connection status.
+   * Emit connection status, passing the full object through so that
+   * additional fields (e.g. `retryInMs`) are preserved for consumers.
    *
-   * @param status        The connection status
-   * @param status.error  Optional error information when status is 'disconnected'
-   * @param status.status The connection status ('connected', 'connecting', 'disconnected')
+   * @param connectionStatus The connection status object
    */
-  emitStatus = ({ error, status }) => {
+  emitStatus = (connectionStatus) => {
+    const { status } = connectionStatus;
+    const error = status === "disconnected" ? connectionStatus.error : void 0;
     if (this.status === status && !error) {
@@ -62,3 +63,3 @@ return;
     this.status = status;
-    this.emit("status", [{ error, status }]);
+    this.emit("status", [connectionStatus]);
   };
@@ -65,0 +66,0 @@ /**

build-module/provi...p-polling/http-polling-provider.mjs.map

 {
   "version": 3,
   "sources": ["../../../src/providers/http-polling/http-polling-provider.ts"],
-  "sourcesContent": ["/**\n * External dependencies\n */\nimport type * as Y from 'yjs';\nimport { ObservableV2 } from 'lib0/observable';\nimport { Awareness } from 'y-protocols/awareness';\n\n/**\n * Internal dependencies\n */\nimport type {\n\tConnectionStatus,\n\tProviderCreator,\n\tProviderCreatorResult,\n} from '../../types';\nimport { pollingManager } from './polling-manager';\n\nexport interface ProviderOptions {\n\tawareness?: Awareness;\n\tdebug?: boolean;\n\troom: string;\n\tydoc: Y.Doc;\n}\n\n/**\n * Event types for HttpPollingProvider.\n * ObservableV2 expects event handlers as functions.\n */\ntype HttpPollingEvents = {\n\tstatus: ( status: ConnectionStatus ) => void;\n};\n\n/**\n * Yjs provider that uses HTTP polling for real-time synchronization. It manages\n * document updates and awareness states through a central sync server.\n */\nclass HttpPollingProvider extends ObservableV2< HttpPollingEvents > {\n\tprotected awareness: Awareness;\n\tprotected status: ConnectionStatus[ 'status' ] = 'disconnected';\n\tprotected synced = false;\n\n\tpublic constructor( protected options: ProviderOptions ) {\n\t\tsuper();\n\t\tthis.log( 'Initializing', { room: options.room } );\n\n\t\tthis.awareness = options.awareness ?? new Awareness( options.ydoc );\n\t\tthis.connect();\n\t}\n\n\t/**\n\t * Connect to the endpoint and initialize sync.\n\t */\n\tpublic connect(): void {\n\t\tthis.log( 'Connecting' );\n\n\t\tpollingManager.registerRoom( {\n\t\t\troom: this.options.room,\n\t\t\tdoc: this.options.ydoc,\n\t\t\tawareness: this.awareness,\n\t\t\tlog: this.log,\n\t\t\tonStatusChange: this.emitStatus,\n\t\t\tonSync: this.onSync,\n\t\t} );\n\t}\n\n\t/**\n\t * Destroy the provider and cleanup resources.\n\t */\n\tpublic destroy(): void {\n\t\tthis.disconnect();\n\t\tsuper.destroy();\n\t}\n\n\t/**\n\t * Disconnect the provider and allow reconnection later.\n\t */\n\tpublic disconnect(): void {\n\t\tthis.log( 'Disconnecting' );\n\n\t\tpollingManager.unregisterRoom( this.options.room );\n\t\tthis.emitStatus( { status: 'disconnected' } );\n\t}\n\n\t/**\n\t * Emit connection status.\n\t *\n\t * @param status        The connection status\n\t * @param status.error  Optional error information when status is 'disconnected'\n\t * @param status.status The connection status ('connected', 'connecting', 'disconnected')\n\t */\n\tprotected emitStatus = ( { error, status }: ConnectionStatus ): void => {\n\t\tif ( this.status === status && ! error ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Only emit 'connecting' status if transitioning from 'disconnected'.\n\t\tif ( status === 'connecting' && this.status !== 'disconnected' ) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis.log( 'Status change', { status, error } );\n\n\t\t// ObservableV2 expects arguments as an array\n\t\tthis.status = status;\n\t\tthis.emit( 'status', [ { error, status } ] );\n\t};\n\n\t/**\n\t * Log debug messages if debugging is enabled.\n\t *\n\t * @param message The debug message\n\t * @param debug   Additional debug information\n\t */\n\tprotected log = ( message: string, debug: object = {} ): void => {\n\t\tif ( this.options.debug ) {\n\t\t\t// eslint-disable-next-line no-console\n\t\t\tconsole.log( `[${ this.constructor.name }]: ${ message }`, {\n\t\t\t\troom: this.options.room,\n\t\t\t\t...debug,\n\t\t\t} );\n\t\t}\n\t};\n\n\t/**\n\t * Handle synchronization events from the polling manager.\n\t */\n\tprotected onSync = (): void => {\n\t\tif ( ! this.synced ) {\n\t\t\tthis.synced = true;\n\t\t\tthis.log( 'Synced' );\n\t\t}\n\t};\n}\n\n/**\n * Create a provider creator function for the HttpPollingProvider\n */\nexport function createHttpPollingProvider(): ProviderCreator {\n\treturn async ( {\n\t\tawareness,\n\t\tobjectType,\n\t\tobjectId,\n\t\tydoc,\n\t} ): Promise< ProviderCreatorResult > => {\n\t\t// Generate room name from objectType and objectId\n\t\tconst room = objectId ? `${ objectType }:${ objectId }` : objectType;\n\t\tconst provider = new HttpPollingProvider( {\n\t\t\tawareness,\n\t\t\t// debug: true,\n\t\t\troom,\n\t\t\tydoc,\n\t\t} );\n\n\t\treturn {\n\t\t\tdestroy: () => provider.destroy(),\n\t\t\t// Adapter: ObservableV2.on is compatible with ProviderOn\n\t\t\t// The callback receives data as the first parameter\n\t\t\ton: ( event, callback ) => {\n\t\t\t\tprovider.on( event, callback );\n\t\t\t},\n\t\t};\n\t};\n}\n"],
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+  "sourcesContent": ["/**\n * External dependencies\n */\nimport type * as Y from 'yjs';\nimport { ObservableV2 } from 'lib0/observable';\nimport { Awareness } from 'y-protocols/awareness';\n\n/**\n * Internal dependencies\n */\nimport type {\n\tConnectionStatus,\n\tProviderCreator,\n\tProviderCreatorResult,\n} from '../../types';\nimport { pollingManager } from './polling-manager';\n\nexport interface ProviderOptions {\n\tawareness?: Awareness;\n\tdebug?: boolean;\n\troom: string;\n\tydoc: Y.Doc;\n}\n\n/**\n * Event types for HttpPollingProvider.\n * ObservableV2 expects event handlers as functions.\n */\ntype HttpPollingEvents = {\n\tstatus: ( status: ConnectionStatus ) => void;\n};\n\n/**\n * Yjs provider that uses HTTP polling for real-time synchronization. It manages\n * document updates and awareness states through a central sync server.\n */\nclass HttpPollingProvider extends ObservableV2< HttpPollingEvents > {\n\tprotected awareness: Awareness;\n\tprotected status: ConnectionStatus[ 'status' ] = 'disconnected';\n\tprotected synced = false;\n\n\tpublic constructor( protected options: ProviderOptions ) {\n\t\tsuper();\n\t\tthis.log( 'Initializing', { room: options.room } );\n\n\t\tthis.awareness = options.awareness ?? new Awareness( options.ydoc );\n\t\tthis.connect();\n\t}\n\n\t/**\n\t * Connect to the endpoint and initialize sync.\n\t */\n\tpublic connect(): void {\n\t\tthis.log( 'Connecting' );\n\n\t\tpollingManager.registerRoom( {\n\t\t\troom: this.options.room,\n\t\t\tdoc: this.options.ydoc,\n\t\t\tawareness: this.awareness,\n\t\t\tlog: this.log,\n\t\t\tonStatusChange: this.emitStatus,\n\t\t\tonSync: this.onSync,\n\t\t} );\n\t}\n\n\t/**\n\t * Destroy the provider and cleanup resources.\n\t */\n\tpublic destroy(): void {\n\t\tthis.disconnect();\n\t\tsuper.destroy();\n\t}\n\n\t/**\n\t * Disconnect the provider and allow reconnection later.\n\t */\n\tpublic disconnect(): void {\n\t\tthis.log( 'Disconnecting' );\n\n\t\tpollingManager.unregisterRoom( this.options.room );\n\t\tthis.emitStatus( { status: 'disconnected' } );\n\t}\n\n\t/**\n\t * Emit connection status, passing the full object through so that\n\t * additional fields (e.g. `retryInMs`) are preserved for consumers.\n\t *\n\t * @param connectionStatus The connection status object\n\t */\n\tprotected emitStatus = ( connectionStatus: ConnectionStatus ): void => {\n\t\tconst { status } = connectionStatus;\n\t\tconst error =\n\t\t\tstatus === 'disconnected' ? connectionStatus.error : undefined;\n\n\t\tif ( this.status === status && ! error ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Only emit 'connecting' status if transitioning from 'disconnected'.\n\t\tif ( status === 'connecting' && this.status !== 'disconnected' ) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis.log( 'Status change', { status, error } );\n\n\t\t// ObservableV2 expects arguments as an array\n\t\tthis.status = status;\n\t\tthis.emit( 'status', [ connectionStatus ] );\n\t};\n\n\t/**\n\t * Log debug messages if debugging is enabled.\n\t *\n\t * @param message The debug message\n\t * @param debug   Additional debug information\n\t */\n\tprotected log = ( message: string, debug: object = {} ): void => {\n\t\tif ( this.options.debug ) {\n\t\t\t// eslint-disable-next-line no-console\n\t\t\tconsole.log( `[${ this.constructor.name }]: ${ message }`, {\n\t\t\t\troom: this.options.room,\n\t\t\t\t...debug,\n\t\t\t} );\n\t\t}\n\t};\n\n\t/**\n\t * Handle synchronization events from the polling manager.\n\t */\n\tprotected onSync = (): void => {\n\t\tif ( ! this.synced ) {\n\t\t\tthis.synced = true;\n\t\t\tthis.log( 'Synced' );\n\t\t}\n\t};\n}\n\n/**\n * Create a provider creator function for the HttpPollingProvider\n */\nexport function createHttpPollingProvider(): ProviderCreator {\n\treturn async ( {\n\t\tawareness,\n\t\tobjectType,\n\t\tobjectId,\n\t\tydoc,\n\t} ): Promise< ProviderCreatorResult > => {\n\t\t// Generate room name from objectType and objectId\n\t\tconst room = objectId ? `${ objectType }:${ objectId }` : objectType;\n\t\tconst provider = new HttpPollingProvider( {\n\t\t\tawareness,\n\t\t\t// debug: true,\n\t\t\troom,\n\t\t\tydoc,\n\t\t} );\n\n\t\treturn {\n\t\t\tdestroy: () => provider.destroy(),\n\t\t\t// Adapter: ObservableV2.on is compatible with ProviderOn\n\t\t\t// The callback receives data as the first parameter\n\t\t\ton: ( event, callback ) => {\n\t\t\t\tprovider.on( event, callback );\n\t\t\t},\n\t\t};\n\t};\n}\n"],
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build-module/providers/http-polling/polling-manager.mjs

@@ -19,3 +19,3 @@ // packages/sync/src/providers/http-polling/polling-manager.ts
 var POLLING_INTERVAL_WITH_COLLABORATORS_IN_MS = 250;
-var POLLING_INTERVAL_BACKGROUND_TAB_IN_MS = 30 * 1e3;
+var POLLING_INTERVAL_BACKGROUND_TAB_IN_MS = 25 * 1e3;
 var MAX_ERROR_BACKOFF_IN_MS = 30 * 1e3;
@@ -156,4 +156,2 @@ var POLLING_MANAGER_ORIGIN = "polling-manager";
       pollingTimeoutId = null;
-    }
-    if (isPolling) {
       poll();
@@ -165,2 +163,3 @@ }
   isPolling = true;
+  pollingTimeoutId = null;
   async function start() {
@@ -249,3 +248,6 @@ if (0 === roomStates.size) {
         roomStates.forEach((state) => {
-          state.onStatusChange({ status: "disconnected" });
+          state.onStatusChange({
+            status: "disconnected",
+            retryInMs: pollInterval
+          });
         });
@@ -338,4 +340,13 @@ }
 }
+function retryNow() {
+  pollInterval = POLLING_INTERVAL_IN_MS * 2;
+  if (pollingTimeoutId) {
+    clearTimeout(pollingTimeoutId);
+    pollingTimeoutId = null;
+    poll();
+  }
+}
 var pollingManager = {
   registerRoom,
+  retryNow,
   unregisterRoom
@@ -342,0 +353,0 @@ };

build-module/providers/http-polling/polling-manager.mjs.map

 {
   "version": 3,
   "sources": ["../../../src/providers/http-polling/polling-manager.ts"],
-  "sourcesContent": ["/**\n * External dependencies\n */\nimport * as Y from 'yjs';\nimport * as encoding from 'lib0/encoding';\nimport * as decoding from 'lib0/decoding';\nimport type { Awareness } from 'y-protocols/awareness';\nimport { removeAwarenessStates } from 'y-protocols/awareness';\nimport * as syncProtocol from 'y-protocols/sync';\n\n/**\n * Internal dependencies\n */\nimport type { ConnectionStatus } from '../../types';\nimport {\n\ttype AwarenessState,\n\ttype LocalAwarenessState,\n\ttype SyncPayload,\n\ttype SyncUpdate,\n\tSyncUpdateType,\n\ttype UpdateQueue,\n} from './types';\nimport {\n\tbase64ToUint8Array,\n\tcreateSyncUpdate,\n\tcreateUpdateQueue,\n\tpostSyncUpdate,\n\tpostSyncUpdateNonBlocking,\n} from './utils';\n\nconst POLLING_INTERVAL_IN_MS = 1000; // 1 second or 1000 milliseconds\nconst POLLING_INTERVAL_WITH_COLLABORATORS_IN_MS = 250; // 250 milliseconds\nconst POLLING_INTERVAL_BACKGROUND_TAB_IN_MS = 30 * 1000; // 30 seconds\nconst MAX_ERROR_BACKOFF_IN_MS = 30 * 1000; // 30 seconds\nconst POLLING_MANAGER_ORIGIN = 'polling-manager';\n\ntype LogFunction = ( message: string, debug?: object ) => void;\n\ninterface PollingManager {\n\tregisterRoom: ( options: RegisterRoomOptions ) => void;\n\tunregisterRoom: ( room: string ) => void;\n}\n\ninterface RegisterRoomOptions {\n\troom: string;\n\tdoc: Y.Doc;\n\tawareness: Awareness;\n\tlog: LogFunction;\n\tonStatusChange: ( status: ConnectionStatus ) => void;\n\tonSync: () => void;\n}\n\ninterface RoomState {\n\tclientId: number;\n\tcreateCompactionUpdate: () => SyncUpdate;\n\tendCursor: number;\n\tlocalAwarenessState: LocalAwarenessState;\n\tlog: LogFunction;\n\tonStatusChange: ( status: ConnectionStatus ) => void;\n\tprocessAwarenessUpdate: ( state: AwarenessState ) => void;\n\tprocessDocUpdate: ( update: SyncUpdate ) => SyncUpdate | void;\n\tunregister: () => void;\n\tupdateQueue: UpdateQueue;\n}\n\nconst roomStates: Map< string, RoomState > = new Map();\n\n/**\n * Create a compaction update by merging existing updates. This preserves\n * the original operation metadata (client IDs, logical clocks) so that\n * Yjs deduplication works correctly when the compaction is applied.\n *\n * Deprecated: The server is moving towards full state updates for compaction.\n *\n * @param updates The updates to merge\n */\nfunction createDeprecatedCompactionUpdate( updates: SyncUpdate[] ): SyncUpdate {\n\t// Extract only compaction and update types for merging (skip sync-step updates).\n\t// Decode base64 updates to Uint8Array for merging.\n\tconst mergeable = updates\n\t\t.filter( ( u ) =>\n\t\t\t[ SyncUpdateType.COMPACTION, SyncUpdateType.UPDATE ].includes(\n\t\t\t\tu.type\n\t\t\t)\n\t\t)\n\t\t.map( ( u ) => base64ToUint8Array( u.data ) );\n\n\t// Merge all updates while preserving operation metadata.\n\treturn createSyncUpdate(\n\t\tY.mergeUpdates( mergeable ),\n\t\tSyncUpdateType.COMPACTION\n\t);\n}\n\n/**\n * Create sync step 1 update (announce our state vector).\n *\n * @param doc The Yjs document\n */\nfunction createSyncStep1Update( doc: Y.Doc ): SyncUpdate {\n\tconst encoder = encoding.createEncoder();\n\tsyncProtocol.writeSyncStep1( encoder, doc );\n\treturn createSyncUpdate(\n\t\tencoding.toUint8Array( encoder ),\n\t\tSyncUpdateType.SYNC_STEP_1\n\t);\n}\n\n/**\n * Create sync step 2 update (acknowledge sync step 1).\n *\n * @param doc   The Yjs document\n * @param step1 The sync step 1 update received\n */\nfunction createSyncStep2Update( doc: Y.Doc, step1: Uint8Array ): SyncUpdate {\n\tconst decoder = decoding.createDecoder( step1 );\n\tconst encoder = encoding.createEncoder();\n\tsyncProtocol.readSyncMessage(\n\t\tdecoder,\n\t\tencoder,\n\t\tdoc,\n\t\tPOLLING_MANAGER_ORIGIN\n\t);\n\treturn createSyncUpdate(\n\t\tencoding.toUint8Array( encoder ),\n\t\tSyncUpdateType.SYNC_STEP_2\n\t);\n}\n\n/**\n * Process an incoming awareness update from the server.\n *\n * @param state     The awareness state received\n * @param awareness The local Awareness instance\n */\nfunction processAwarenessUpdate(\n\tstate: AwarenessState,\n\tawareness: Awareness\n): void {\n\tconst currentStates = awareness.getStates();\n\tconst added = new Set< number >();\n\tconst updated = new Set< number >();\n\n\t// Removed clients are missing from the server state.\n\tconst removed = new Set< number >(\n\t\tcurrentStates.keys().filter( ( clientId ) => ! state[ clientId ] )\n\t);\n\n\tObject.entries( state ).forEach( ( [ clientIdString, awarenessState ] ) => {\n\t\tconst clientId = Number( clientIdString );\n\n\t\t// Skip our own state (we already have it locally).\n\t\tif ( clientId === awareness.clientID ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// A null state should be removed by the server, but handle it here just in case.\n\t\tif ( null === awarenessState ) {\n\t\t\tcurrentStates.delete( clientId );\n\t\t\tremoved.add( clientId );\n\t\t\treturn;\n\t\t}\n\n\t\tif ( ! currentStates.has( clientId ) ) {\n\t\t\tcurrentStates.set( clientId, awarenessState );\n\t\t\tadded.add( clientId );\n\t\t\treturn;\n\t\t}\n\n\t\tconst currentState = currentStates.get( clientId );\n\n\t\tif (\n\t\t\tJSON.stringify( currentState ) !== JSON.stringify( awarenessState )\n\t\t) {\n\t\t\tcurrentStates.set( clientId, awarenessState );\n\t\t\tupdated.add( clientId );\n\t\t}\n\t} );\n\n\tif ( added.size + updated.size > 0 ) {\n\t\tawareness.emit( 'change', [\n\t\t\t{\n\t\t\t\tadded: Array.from( added ),\n\t\t\t\tupdated: Array.from( updated ),\n\t\t\t\t// Left blank on purpose, as the removal of clients is handled in the if condition below.\n\t\t\t\tremoved: [],\n\t\t\t},\n\t\t] );\n\t}\n\n\tif ( removed.size > 0 ) {\n\t\tremoveAwarenessStates(\n\t\t\tawareness,\n\t\t\tArray.from( removed ),\n\t\t\tPOLLING_MANAGER_ORIGIN\n\t\t);\n\t}\n}\n\n/**\n * Process an incoming sync / document update based on its type.\n *\n * @param update The typed update received\n * @param doc    The Yjs document\n * @param onSync Callback when sync is complete\n * @return A response update if needed (e.g., sync_step2 in response to sync_step1)\n */\nfunction processDocUpdate(\n\tupdate: SyncUpdate,\n\tdoc: Y.Doc,\n\tonSync: () => void\n): SyncUpdate | void {\n\tconst data = base64ToUint8Array( update.data );\n\n\tswitch ( update.type ) {\n\t\tcase SyncUpdateType.SYNC_STEP_1: {\n\t\t\t// Respond to sync step 1 with sync step 2.\n\t\t\treturn createSyncStep2Update( doc, data );\n\t\t}\n\n\t\tcase SyncUpdateType.SYNC_STEP_2: {\n\t\t\t// Apply sync step 2 (potentially contains missing updates).\n\t\t\tconst decoder = decoding.createDecoder( data );\n\t\t\tconst encoder = encoding.createEncoder();\n\t\t\tsyncProtocol.readSyncMessage(\n\t\t\t\tdecoder,\n\t\t\t\tencoder,\n\t\t\t\tdoc,\n\t\t\t\tPOLLING_MANAGER_ORIGIN\n\t\t\t);\n\t\t\tonSync();\n\t\t\treturn;\n\t\t}\n\n\t\tcase SyncUpdateType.COMPACTION:\n\t\tcase SyncUpdateType.UPDATE: {\n\t\t\t// Apply document update directly.\n\t\t\tY.applyUpdate( doc, data, POLLING_MANAGER_ORIGIN );\n\t\t}\n\t}\n}\n\nlet areListenersRegistered = false;\nlet hasCollaborators = false;\nlet isActiveBrowser = 'visible' === document.visibilityState;\nlet isPolling = false;\nlet isUnloadPending = false;\nlet pollInterval = POLLING_INTERVAL_IN_MS;\nlet pollingTimeoutId: ReturnType< typeof setTimeout > | null = null;\n\n/**\n * Mark that a page unload has been requested. This fires on\n * `beforeunload` which happens before the browser aborts in-flight\n * fetches, allowing us to distinguish poll failures caused by\n * navigation from genuine server errors in the catch block.\n *\n * If the user cancels the unload (e.g. by dismissing a \"Save Changes?\" dialog),\n * the flag is reset at the start of the next poll cycle so that polling can\n * resume.\n */\nfunction handleBeforeUnload(): void {\n\tisUnloadPending = true;\n}\n\n/**\n * Send a disconnect signal for all registered rooms when the page is\n * being unloaded. Uses `sendBeacon` so the request survives navigation.\n */\nfunction handlePageHide(): void {\n\tconst rooms = Array.from( roomStates.entries() ).map(\n\t\t( [ room, state ] ) => ( {\n\t\t\tafter: 0,\n\t\t\tawareness: null,\n\t\t\tclient_id: state.clientId,\n\t\t\troom,\n\t\t\tupdates: [],\n\t\t} )\n\t);\n\n\tpostSyncUpdateNonBlocking( { rooms } );\n}\n\n/**\n * Hangle change in visibility state of browser tab.\n *\n * Used to trigger a slow down of the collaboration syncs when the\n * browser tab becomes inactive (either the user switches tabs or the\n * screen saver comes on).\n *\n * Fires on the document's visibilitychange event.\n */\nfunction handleVisibilityChange() {\n\tconst wasActive = isActiveBrowser;\n\tisActiveBrowser = document.visibilityState === 'visible';\n\n\tif ( isActiveBrowser && ! wasActive ) {\n\t\t/*\n\t\t * Remove scheduled polling and repoll immediately when reactivated.\n\t\t *\n\t\t * This ensures that any updates by collaborators are immediately reflected\n\t\t * in the document once the browser tab becomes active. Otherwise there would\n\t\t * be a delay of 30 seconds before the updates came through.\n\t\t */\n\t\tif ( pollingTimeoutId ) {\n\t\t\tclearTimeout( pollingTimeoutId );\n\t\t\tpollingTimeoutId = null;\n\t\t}\n\n\t\tif ( isPolling ) {\n\t\t\tpoll();\n\t\t}\n\t}\n}\n\nfunction poll(): void {\n\tisPolling = true;\n\n\tasync function start(): Promise< void > {\n\t\tif ( 0 === roomStates.size ) {\n\t\t\tisPolling = false;\n\t\t\treturn;\n\t\t}\n\n\t\t// Reset the unloading flag at the start of each poll cycle so\n\t\t// it doesn't permanently suppress disconnect after the user\n\t\t// cancels a beforeunload dialog.\n\t\tisUnloadPending = false;\n\n\t\t// Emit 'connecting' status.\n\t\troomStates.forEach( ( state ) => {\n\t\t\tstate.onStatusChange( { status: 'connecting' } );\n\t\t} );\n\n\t\t// Create a payload with all queued updates. We include rooms even if they\n\t\t// have no updates to ensure we receive any incoming updates. Note that we\n\t\t// withhold our own updates until we detect another collaborator using the\n\t\t// queue's pause / resume mechanism.\n\t\tconst payload: SyncPayload = {\n\t\t\trooms: Array.from( roomStates.entries() ).map(\n\t\t\t\t( [ room, state ] ) => ( {\n\t\t\t\t\tafter: state.endCursor ?? 0,\n\t\t\t\t\tawareness: state.localAwarenessState,\n\t\t\t\t\tclient_id: state.clientId,\n\t\t\t\t\troom,\n\t\t\t\t\tupdates: state.updateQueue.get(),\n\t\t\t\t} )\n\t\t\t),\n\t\t};\n\n\t\ttry {\n\t\t\tconst { rooms } = await postSyncUpdate( payload );\n\n\t\t\t// Emit 'connected' status.\n\t\t\troomStates.forEach( ( state ) => {\n\t\t\t\tstate.onStatusChange( { status: 'connected' } );\n\t\t\t} );\n\n\t\t\trooms.forEach( ( room ) => {\n\t\t\t\tif ( ! roomStates.has( room.room ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tconst roomState = roomStates.get( room.room )!;\n\t\t\t\troomState.endCursor = room.end_cursor;\n\n\t\t\t\t// Process awareness update.\n\t\t\t\troomState.processAwarenessUpdate( room.awareness );\n\n\t\t\t\t// If there is another collaborator, resume the queue for the next poll\n\t\t\t\t// and increase polling frequency.\n\t\t\t\tif ( Object.keys( room.awareness ).length > 1 ) {\n\t\t\t\t\thasCollaborators = true;\n\t\t\t\t\troomState.updateQueue.resume();\n\t\t\t\t}\n\n\t\t\t\t// Process each incoming update and collect any responses.\n\t\t\t\tconst responseUpdates = room.updates\n\t\t\t\t\t.map( ( update ) => roomState.processDocUpdate( update ) )\n\t\t\t\t\t.filter( ( update ): update is SyncUpdate =>\n\t\t\t\t\t\tBoolean( update )\n\t\t\t\t\t);\n\t\t\t\troomState.updateQueue.addBulk( responseUpdates );\n\n\t\t\t\t// Respond to compaction requests from server. The server asks only one\n\t\t\t\t// client at a time to compact (lowest active client ID). We encode our\n\t\t\t\t// full document state to replace all prior updates on the server.\n\t\t\t\tif ( room.should_compact ) {\n\t\t\t\t\troomState.log( 'Server requested compaction update' );\n\t\t\t\t\troomState.updateQueue.clear();\n\t\t\t\t\troomState.updateQueue.add(\n\t\t\t\t\t\troomState.createCompactionUpdate()\n\t\t\t\t\t);\n\t\t\t\t} else if ( room.compaction_request ) {\n\t\t\t\t\t// Deprecated\n\t\t\t\t\troomState.log( 'Server requested (old) compaction update' );\n\t\t\t\t\troomState.updateQueue.add(\n\t\t\t\t\t\tcreateDeprecatedCompactionUpdate(\n\t\t\t\t\t\t\troom.compaction_request\n\t\t\t\t\t\t)\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\t// Recalculate polling interval.\n\t\t\tif ( isActiveBrowser && hasCollaborators ) {\n\t\t\t\tpollInterval = POLLING_INTERVAL_WITH_COLLABORATORS_IN_MS;\n\t\t\t} else if ( isActiveBrowser ) {\n\t\t\t\tpollInterval = POLLING_INTERVAL_IN_MS;\n\t\t\t} else {\n\t\t\t\tpollInterval = POLLING_INTERVAL_BACKGROUND_TAB_IN_MS;\n\t\t\t}\n\t\t} catch ( error ) {\n\t\t\t// Exponential backoff on error: double the backoff time, up to max\n\t\t\tpollInterval = Math.min(\n\t\t\t\tpollInterval * 2,\n\t\t\t\tMAX_ERROR_BACKOFF_IN_MS\n\t\t\t);\n\n\t\t\t// Restore updates to queues on failure so they can be retried.\n\t\t\tfor ( const room of payload.rooms ) {\n\t\t\t\tif ( ! roomStates.has( room.room ) ) {\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\n\t\t\t\tconst state = roomStates.get( room.room )!;\n\t\t\t\tstate.updateQueue.restore( room.updates );\n\t\t\t\tstate.log(\n\t\t\t\t\t'Error posting sync update, will retry with backoff',\n\t\t\t\t\t{\n\t\t\t\t\t\terror,\n\t\t\t\t\t\tnextPoll: pollInterval,\n\t\t\t\t\t}\n\t\t\t\t);\n\t\t\t}\n\n\t\t\t// Don't report disconnected status when the request was aborted\n\t\t\t// due to page unload (e.g. during a refresh) to avoid briefly\n\t\t\t// flashing the disconnect dialog before the new page loads.\n\t\t\tif ( ! isUnloadPending ) {\n\t\t\t\troomStates.forEach( ( state ) => {\n\t\t\t\t\tstate.onStatusChange( { status: 'disconnected' } );\n\t\t\t\t} );\n\t\t\t}\n\t\t}\n\n\t\tpollingTimeoutId = setTimeout( poll, pollInterval );\n\t}\n\n\t// Start polling.\n\tvoid start();\n}\nfunction registerRoom( {\n\troom,\n\tdoc,\n\tawareness,\n\tlog,\n\tonSync,\n\tonStatusChange,\n}: RegisterRoomOptions ): void {\n\tif ( roomStates.has( room ) ) {\n\t\treturn;\n\t}\n\n\t// Note: Queue is initially paused. Call .resume() to unpause.\n\tconst updateQueue = createUpdateQueue( [ createSyncStep1Update( doc ) ] );\n\n\tfunction onAwarenessUpdate(): void {\n\t\troomState.localAwarenessState = awareness.getLocalState() ?? {};\n\t}\n\n\tfunction onDocUpdate( update: Uint8Array, origin: unknown ): void {\n\t\tif ( POLLING_MANAGER_ORIGIN === origin ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Tag local document changes as 'update' type.\n\t\tupdateQueue.add( createSyncUpdate( update, SyncUpdateType.UPDATE ) );\n\t}\n\n\tfunction unregister(): void {\n\t\tdoc.off( 'update', onDocUpdate );\n\t\tawareness.off( 'change', onAwarenessUpdate );\n\t\tupdateQueue.clear();\n\t}\n\n\tconst roomState: RoomState = {\n\t\tclientId: doc.clientID,\n\t\tcreateCompactionUpdate: () =>\n\t\t\tcreateSyncUpdate(\n\t\t\t\tY.encodeStateAsUpdate( doc ),\n\t\t\t\tSyncUpdateType.COMPACTION\n\t\t\t),\n\t\tendCursor: 0,\n\t\tlocalAwarenessState: awareness.getLocalState() ?? {},\n\t\tlog,\n\t\tonStatusChange,\n\t\tprocessAwarenessUpdate: ( state: AwarenessState ) =>\n\t\t\tprocessAwarenessUpdate( state, awareness ),\n\t\tprocessDocUpdate: ( update: SyncUpdate ) =>\n\t\t\tprocessDocUpdate( update, doc, onSync ),\n\t\tunregister,\n\t\tupdateQueue,\n\t};\n\n\tdoc.on( 'update', onDocUpdate );\n\tawareness.on( 'change', onAwarenessUpdate );\n\troomStates.set( room, roomState );\n\n\tif ( ! areListenersRegistered ) {\n\t\twindow.addEventListener( 'beforeunload', handleBeforeUnload );\n\t\twindow.addEventListener( 'pagehide', handlePageHide );\n\t\tdocument.addEventListener( 'visibilitychange', handleVisibilityChange );\n\t\tareListenersRegistered = true;\n\t}\n\n\tif ( ! isPolling ) {\n\t\tpoll();\n\t}\n}\n\nfunction unregisterRoom( room: string ): void {\n\tconst state = roomStates.get( room );\n\tif ( state ) {\n\t\t// Send a disconnect signal so the server removes this client's\n\t\t// awareness entry immediately instead of waiting for the timeout.\n\t\tconst rooms = [\n\t\t\t{\n\t\t\t\tafter: 0,\n\t\t\t\tawareness: null,\n\t\t\t\tclient_id: state.clientId,\n\t\t\t\troom,\n\t\t\t\tupdates: [],\n\t\t\t},\n\t\t];\n\n\t\tpostSyncUpdateNonBlocking( { rooms } );\n\t\tstate.unregister();\n\t\troomStates.delete( room );\n\t}\n\n\tif ( 0 === roomStates.size && areListenersRegistered ) {\n\t\twindow.removeEventListener( 'beforeunload', handleBeforeUnload );\n\t\twindow.removeEventListener( 'pagehide', handlePageHide );\n\t\tdocument.removeEventListener(\n\t\t\t'visibilitychange',\n\t\t\thandleVisibilityChange\n\t\t);\n\t\tareListenersRegistered = false;\n\t}\n}\n\nexport const pollingManager: PollingManager = {\n\tregisterRoom,\n\tunregisterRoom,\n};\n"],
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state[ clientId ] )\n\t);\n\n\tObject.entries( state ).forEach( ( [ clientIdString, awarenessState ] ) => {\n\t\tconst clientId = Number( clientIdString );\n\n\t\t// Skip our own state (we already have it locally).\n\t\tif ( clientId === awareness.clientID ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// A null state should be removed by the server, but handle it here just in case.\n\t\tif ( null === awarenessState ) {\n\t\t\tcurrentStates.delete( clientId );\n\t\t\tremoved.add( clientId );\n\t\t\treturn;\n\t\t}\n\n\t\tif ( ! currentStates.has( clientId ) ) {\n\t\t\tcurrentStates.set( clientId, awarenessState );\n\t\t\tadded.add( clientId );\n\t\t\treturn;\n\t\t}\n\n\t\tconst currentState = currentStates.get( clientId );\n\n\t\tif (\n\t\t\tJSON.stringify( currentState ) !== JSON.stringify( awarenessState )\n\t\t) {\n\t\t\tcurrentStates.set( clientId, awarenessState );\n\t\t\tupdated.add( clientId );\n\t\t}\n\t} );\n\n\tif ( added.size + updated.size > 0 ) {\n\t\tawareness.emit( 'change', [\n\t\t\t{\n\t\t\t\tadded: Array.from( added ),\n\t\t\t\tupdated: Array.from( updated ),\n\t\t\t\t// Left blank on purpose, as the removal of clients is handled in the if condition below.\n\t\t\t\tremoved: [],\n\t\t\t},\n\t\t] );\n\t}\n\n\tif ( removed.size > 0 ) {\n\t\tremoveAwarenessStates(\n\t\t\tawareness,\n\t\t\tArray.from( removed ),\n\t\t\tPOLLING_MANAGER_ORIGIN\n\t\t);\n\t}\n}\n\n/**\n * Process an incoming sync / document update based on its type.\n *\n * @param update The typed update received\n * @param doc    The Yjs document\n * @param onSync Callback when sync is complete\n * @return A response update if needed (e.g., sync_step2 in response to sync_step1)\n */\nfunction processDocUpdate(\n\tupdate: SyncUpdate,\n\tdoc: Y.Doc,\n\tonSync: () => void\n): SyncUpdate | void {\n\tconst data = base64ToUint8Array( update.data );\n\n\tswitch ( update.type ) {\n\t\tcase SyncUpdateType.SYNC_STEP_1: {\n\t\t\t// Respond to sync step 1 with sync step 2.\n\t\t\treturn createSyncStep2Update( doc, data );\n\t\t}\n\n\t\tcase SyncUpdateType.SYNC_STEP_2: {\n\t\t\t// Apply sync step 2 (potentially contains missing updates).\n\t\t\tconst decoder = decoding.createDecoder( data );\n\t\t\tconst encoder = encoding.createEncoder();\n\t\t\tsyncProtocol.readSyncMessage(\n\t\t\t\tdecoder,\n\t\t\t\tencoder,\n\t\t\t\tdoc,\n\t\t\t\tPOLLING_MANAGER_ORIGIN\n\t\t\t);\n\t\t\tonSync();\n\t\t\treturn;\n\t\t}\n\n\t\tcase SyncUpdateType.COMPACTION:\n\t\tcase SyncUpdateType.UPDATE: {\n\t\t\t// Apply document update directly.\n\t\t\tY.applyUpdate( doc, data, POLLING_MANAGER_ORIGIN );\n\t\t}\n\t}\n}\n\nlet areListenersRegistered = false;\nlet hasCollaborators = false;\nlet isActiveBrowser = 'visible' === document.visibilityState;\nlet isPolling = false;\nlet isUnloadPending = false;\nlet pollInterval = POLLING_INTERVAL_IN_MS;\nlet pollingTimeoutId: ReturnType< typeof setTimeout > | null = null;\n\n/**\n * Mark that a page unload has been requested. This fires on\n * `beforeunload` which happens before the browser aborts in-flight\n * fetches, allowing us to distinguish poll failures caused by\n * navigation from genuine server errors in the catch block.\n *\n * If the user cancels the unload (e.g. by dismissing a \"Save Changes?\" dialog),\n * the flag is reset at the start of the next poll cycle so that polling can\n * resume.\n */\nfunction handleBeforeUnload(): void {\n\tisUnloadPending = true;\n}\n\n/**\n * Send a disconnect signal for all registered rooms when the page is\n * being unloaded. Uses `sendBeacon` so the request survives navigation.\n */\nfunction handlePageHide(): void {\n\tconst rooms = Array.from( roomStates.entries() ).map(\n\t\t( [ room, state ] ) => ( {\n\t\t\tafter: 0,\n\t\t\tawareness: null,\n\t\t\tclient_id: state.clientId,\n\t\t\troom,\n\t\t\tupdates: [],\n\t\t} )\n\t);\n\n\tpostSyncUpdateNonBlocking( { rooms } );\n}\n\n/**\n * Hangle change in visibility state of browser tab.\n *\n * Used to trigger a slow down of the collaboration syncs when the\n * browser tab becomes inactive (either the user switches tabs or the\n * screen saver comes on).\n *\n * Fires on the document's visibilitychange event.\n */\nfunction handleVisibilityChange() {\n\tconst wasActive = isActiveBrowser;\n\tisActiveBrowser = document.visibilityState === 'visible';\n\n\tif ( isActiveBrowser && ! wasActive ) {\n\t\t/*\n\t\t * Remove scheduled polling and repoll immediately when reactivated.\n\t\t *\n\t\t * This ensures that any updates by collaborators are immediately\n\t\t * reflected in the document once the browser tab becomes active.\n\t\t * Otherwise there would be a delay of up to 30 seconds before the\n\t\t * updates came through.\n\t\t *\n\t\t * Only repoll if we cleared a pending timeout, meaning the poll loop\n\t\t * was idle between cycles. If no timeout is pending, a poll request\n\t\t * is already in-flight and will pick up the updated isActiveBrowser\n\t\t * value when it schedules the next cycle.\n\t\t */\n\t\tif ( pollingTimeoutId ) {\n\t\t\tclearTimeout( pollingTimeoutId );\n\t\t\tpollingTimeoutId = null;\n\t\t\tpoll();\n\t\t}\n\t}\n}\n\nfunction poll(): void {\n\tisPolling = true;\n\tpollingTimeoutId = null;\n\n\tasync function start(): Promise< void > {\n\t\tif ( 0 === roomStates.size ) {\n\t\t\tisPolling = false;\n\t\t\treturn;\n\t\t}\n\n\t\t// Reset the unloading flag at the start of each poll cycle so\n\t\t// it doesn't permanently suppress disconnect after the user\n\t\t// cancels a beforeunload dialog.\n\t\tisUnloadPending = false;\n\n\t\t// Emit 'connecting' status.\n\t\troomStates.forEach( ( state ) => {\n\t\t\tstate.onStatusChange( { status: 'connecting' } );\n\t\t} );\n\n\t\t// Create a payload with all queued updates. We include rooms even if they\n\t\t// have no updates to ensure we receive any incoming updates. Note that we\n\t\t// withhold our own updates until we detect another collaborator using the\n\t\t// queue's pause / resume mechanism.\n\t\tconst payload: SyncPayload = {\n\t\t\trooms: Array.from( roomStates.entries() ).map(\n\t\t\t\t( [ room, state ] ) => ( {\n\t\t\t\t\tafter: state.endCursor ?? 0,\n\t\t\t\t\tawareness: state.localAwarenessState,\n\t\t\t\t\tclient_id: state.clientId,\n\t\t\t\t\troom,\n\t\t\t\t\tupdates: state.updateQueue.get(),\n\t\t\t\t} )\n\t\t\t),\n\t\t};\n\n\t\ttry {\n\t\t\tconst { rooms } = await postSyncUpdate( payload );\n\n\t\t\t// Emit 'connected' status.\n\t\t\troomStates.forEach( ( state ) => {\n\t\t\t\tstate.onStatusChange( { status: 'connected' } );\n\t\t\t} );\n\n\t\t\trooms.forEach( ( room ) => {\n\t\t\t\tif ( ! roomStates.has( room.room ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tconst roomState = roomStates.get( room.room )!;\n\t\t\t\troomState.endCursor = room.end_cursor;\n\n\t\t\t\t// Process awareness update.\n\t\t\t\troomState.processAwarenessUpdate( room.awareness );\n\n\t\t\t\t// If there is another collaborator, resume the queue for the next poll\n\t\t\t\t// and increase polling frequency.\n\t\t\t\tif ( Object.keys( room.awareness ).length > 1 ) {\n\t\t\t\t\thasCollaborators = true;\n\t\t\t\t\troomState.updateQueue.resume();\n\t\t\t\t}\n\n\t\t\t\t// Process each incoming update and collect any responses.\n\t\t\t\tconst responseUpdates = room.updates\n\t\t\t\t\t.map( ( update ) => roomState.processDocUpdate( update ) )\n\t\t\t\t\t.filter( ( update ): update is SyncUpdate =>\n\t\t\t\t\t\tBoolean( update )\n\t\t\t\t\t);\n\t\t\t\troomState.updateQueue.addBulk( responseUpdates );\n\n\t\t\t\t// Respond to compaction requests from server. The server asks only one\n\t\t\t\t// client at a time to compact (lowest active client ID). We encode our\n\t\t\t\t// full document state to replace all prior updates on the server.\n\t\t\t\tif ( room.should_compact ) {\n\t\t\t\t\troomState.log( 'Server requested compaction update' );\n\t\t\t\t\troomState.updateQueue.clear();\n\t\t\t\t\troomState.updateQueue.add(\n\t\t\t\t\t\troomState.createCompactionUpdate()\n\t\t\t\t\t);\n\t\t\t\t} else if ( room.compaction_request ) {\n\t\t\t\t\t// Deprecated\n\t\t\t\t\troomState.log( 'Server requested (old) compaction update' );\n\t\t\t\t\troomState.updateQueue.add(\n\t\t\t\t\t\tcreateDeprecatedCompactionUpdate(\n\t\t\t\t\t\t\troom.compaction_request\n\t\t\t\t\t\t)\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\t// Recalculate polling interval.\n\t\t\tif ( isActiveBrowser && hasCollaborators ) {\n\t\t\t\tpollInterval = POLLING_INTERVAL_WITH_COLLABORATORS_IN_MS;\n\t\t\t} else if ( isActiveBrowser ) {\n\t\t\t\tpollInterval = POLLING_INTERVAL_IN_MS;\n\t\t\t} else {\n\t\t\t\tpollInterval = POLLING_INTERVAL_BACKGROUND_TAB_IN_MS;\n\t\t\t}\n\t\t} catch ( error ) {\n\t\t\t// Exponential backoff on error: double the backoff time, up to max\n\t\t\tpollInterval = Math.min(\n\t\t\t\tpollInterval * 2,\n\t\t\t\tMAX_ERROR_BACKOFF_IN_MS\n\t\t\t);\n\n\t\t\t// Restore updates to queues on failure so they can be retried.\n\t\t\tfor ( const room of payload.rooms ) {\n\t\t\t\tif ( ! roomStates.has( room.room ) ) {\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\n\t\t\t\tconst state = roomStates.get( room.room )!;\n\t\t\t\tstate.updateQueue.restore( room.updates );\n\t\t\t\tstate.log(\n\t\t\t\t\t'Error posting sync update, will retry with backoff',\n\t\t\t\t\t{\n\t\t\t\t\t\terror,\n\t\t\t\t\t\tnextPoll: pollInterval,\n\t\t\t\t\t}\n\t\t\t\t);\n\t\t\t}\n\n\t\t\t// Don't report disconnected status when the request was aborted\n\t\t\t// due to page unload (e.g. during a refresh) to avoid briefly\n\t\t\t// flashing the disconnect dialog before the new page loads.\n\t\t\tif ( ! isUnloadPending ) {\n\t\t\t\troomStates.forEach( ( state ) => {\n\t\t\t\t\tstate.onStatusChange( {\n\t\t\t\t\t\tstatus: 'disconnected',\n\t\t\t\t\t\tretryInMs: pollInterval,\n\t\t\t\t\t} );\n\t\t\t\t} );\n\t\t\t}\n\t\t}\n\n\t\tpollingTimeoutId = setTimeout( poll, pollInterval );\n\t}\n\n\t// Start polling.\n\tvoid start();\n}\nfunction registerRoom( {\n\troom,\n\tdoc,\n\tawareness,\n\tlog,\n\tonSync,\n\tonStatusChange,\n}: RegisterRoomOptions ): void {\n\tif ( roomStates.has( room ) ) {\n\t\treturn;\n\t}\n\n\t// Note: Queue is initially paused. Call .resume() to unpause.\n\tconst updateQueue = createUpdateQueue( [ createSyncStep1Update( doc ) ] );\n\n\tfunction onAwarenessUpdate(): void {\n\t\troomState.localAwarenessState = awareness.getLocalState() ?? {};\n\t}\n\n\tfunction onDocUpdate( update: Uint8Array, origin: unknown ): void {\n\t\tif ( POLLING_MANAGER_ORIGIN === origin ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Tag local document changes as 'update' type.\n\t\tupdateQueue.add( createSyncUpdate( update, SyncUpdateType.UPDATE ) );\n\t}\n\n\tfunction unregister(): void {\n\t\tdoc.off( 'update', onDocUpdate );\n\t\tawareness.off( 'change', onAwarenessUpdate );\n\t\tupdateQueue.clear();\n\t}\n\n\tconst roomState: RoomState = {\n\t\tclientId: doc.clientID,\n\t\tcreateCompactionUpdate: () =>\n\t\t\tcreateSyncUpdate(\n\t\t\t\tY.encodeStateAsUpdate( doc ),\n\t\t\t\tSyncUpdateType.COMPACTION\n\t\t\t),\n\t\tendCursor: 0,\n\t\tlocalAwarenessState: awareness.getLocalState() ?? {},\n\t\tlog,\n\t\tonStatusChange,\n\t\tprocessAwarenessUpdate: ( state: AwarenessState ) =>\n\t\t\tprocessAwarenessUpdate( state, awareness ),\n\t\tprocessDocUpdate: ( update: SyncUpdate ) =>\n\t\t\tprocessDocUpdate( update, doc, onSync ),\n\t\tunregister,\n\t\tupdateQueue,\n\t};\n\n\tdoc.on( 'update', onDocUpdate );\n\tawareness.on( 'change', onAwarenessUpdate );\n\troomStates.set( room, roomState );\n\n\tif ( ! areListenersRegistered ) {\n\t\twindow.addEventListener( 'beforeunload', handleBeforeUnload );\n\t\twindow.addEventListener( 'pagehide', handlePageHide );\n\t\tdocument.addEventListener( 'visibilitychange', handleVisibilityChange );\n\t\tareListenersRegistered = true;\n\t}\n\n\tif ( ! isPolling ) {\n\t\tpoll();\n\t}\n}\n\nfunction unregisterRoom( room: string ): void {\n\tconst state = roomStates.get( room );\n\tif ( state ) {\n\t\t// Send a disconnect signal so the server removes this client's\n\t\t// awareness entry immediately instead of waiting for the timeout.\n\t\tconst rooms = [\n\t\t\t{\n\t\t\t\tafter: 0,\n\t\t\t\tawareness: null,\n\t\t\t\tclient_id: state.clientId,\n\t\t\t\troom,\n\t\t\t\tupdates: [],\n\t\t\t},\n\t\t];\n\n\t\tpostSyncUpdateNonBlocking( { rooms } );\n\t\tstate.unregister();\n\t\troomStates.delete( room );\n\t}\n\n\tif ( 0 === roomStates.size && areListenersRegistered ) {\n\t\twindow.removeEventListener( 'beforeunload', handleBeforeUnload );\n\t\twindow.removeEventListener( 'pagehide', handlePageHide );\n\t\tdocument.removeEventListener(\n\t\t\t'visibilitychange',\n\t\t\thandleVisibilityChange\n\t\t);\n\t\tareListenersRegistered = false;\n\t}\n}\n\n/**\n * Immediately retry the sync connection by cancelling any pending backoff\n * timeout and triggering a new poll. If a request is already in-flight,\n * the backoff interval is reset so the next scheduled poll fires sooner.\n */\nfunction retryNow(): void {\n\tpollInterval = POLLING_INTERVAL_IN_MS * 2;\n\n\tif ( pollingTimeoutId ) {\n\t\tclearTimeout( pollingTimeoutId );\n\t\tpollingTimeoutId = null;\n\t\tpoll();\n\t}\n}\n\nexport const pollingManager: PollingManager = {\n\tregisterRoom,\n\tretryNow,\n\tunregisterRoom,\n};\n"],
+  "mappings": 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build-module/quill-delta/Delta.mjs

@@ -11,2 +11,8 @@ // packages/sync/src/quill-delta/Delta.ts
 var NULL_CHARACTER = String.fromCharCode(0);
+function normalizeChangeCounts(changes) {
+  return changes.map((change) => ({
+    ...change,
+    count: change.value.length
+  }));
+}
 var getEmbedTypeAndData = (a, b) => {
@@ -273,3 +279,5 @@ if (typeof a !== "object" || a === null) {
     const strings = this.deltasToStrings(other);
-    const diffResult = diffChars(strings[0], strings[1]);
+    const diffResult = normalizeChangeCounts(
+      diffChars(strings[0], strings[1])
+    );
     const thisIter = new OpIterator(this.ops);
@@ -444,3 +452,5 @@ const otherIter = new OpIterator(other.ops);
     const strings = this.deltasToStrings(other);
-    let diffs = diffChars(strings[0], strings[1]);
+    let diffs = normalizeChangeCounts(
+      diffChars(strings[0], strings[1])
+    );
     let lastDiffPosition = 0;
@@ -447,0 +457,0 @@ const adjustedDiffs = [];

build-module/quill-delta/Delta.mjs.map

 {
   "version": 3,
   "sources": ["../../src/quill-delta/Delta.ts"],
-  "sourcesContent": ["// File copied https://github.com/slab/delta/blob/main/src/Delta.ts with changes:\n// - fast-diff swapped out for 'diff',\n// - lodash.clonedeep is replaced with JSON parse / stringify\n// - lodash.isequal is replaced with fast-deep-equal.\n\n// @ts-ignore\n/**\n * External dependencies\n */\nimport type { Change } from 'diff';\nimport { diffChars } from 'diff';\nimport { default as isEqual } from 'fast-deep-equal/es6';\n\n/**\n * Internal dependencies\n */\nimport AttributeMap from './AttributeMap';\nimport Op from './Op';\nimport OpIterator from './OpIterator';\n\nfunction cloneDeep< T >( value: T ): T {\n\treturn JSON.parse( JSON.stringify( value ) ) as T;\n}\n\nconst NULL_CHARACTER = String.fromCharCode( 0 ); // Placeholder char for embed in diff()\n\ninterface EmbedHandler< T > {\n\tcompose: ( a: T, b: T, keepNull: boolean ) => T;\n\tinvert: ( a: T, b: T ) => T;\n\ttransform: ( a: T, b: T, priority: boolean ) => T;\n}\n\nconst getEmbedTypeAndData = (\n\ta: Op[ 'insert' ] | Op[ 'retain' ],\n\tb: Op[ 'insert' ]\n): [ string, unknown, unknown ] => {\n\tif ( typeof a !== 'object' || a === null ) {\n\t\tthrow new Error( `cannot retain a ${ typeof a }` );\n\t}\n\tif ( typeof b !== 'object' || b === null ) {\n\t\tthrow new Error( `cannot retain a ${ typeof b }` );\n\t}\n\tconst embedType = Object.keys( a )[ 0 ];\n\tif ( ! embedType || embedType !== Object.keys( b )[ 0 ] ) {\n\t\tthrow new Error(\n\t\t\t`embed types not matched: ${ embedType } != ${\n\t\t\t\tObject.keys( b )[ 0 ]\n\t\t\t}`\n\t\t);\n\t}\n\treturn [ embedType, a[ embedType ], b[ embedType ] ];\n};\n\nclass Delta {\n\tstatic Op = Op;\n\tstatic OpIterator = OpIterator;\n\tstatic AttributeMap = AttributeMap;\n\tprivate static handlers: {\n\t\t[ embedType: string ]: EmbedHandler< unknown >;\n\t} = {};\n\n\tstatic registerEmbed< T >(\n\t\tembedType: string,\n\t\thandler: EmbedHandler< T >\n\t): void {\n\t\tthis.handlers[ embedType ] = handler as EmbedHandler< unknown >;\n\t}\n\n\tstatic unregisterEmbed( embedType: string ): void {\n\t\tdelete this.handlers[ embedType ];\n\t}\n\n\tprivate static getHandler( embedType: string ): EmbedHandler< unknown > {\n\t\tconst handler = this.handlers[ embedType ];\n\t\tif ( ! handler ) {\n\t\t\tthrow new Error( `no handlers for embed type \"${ embedType }\"` );\n\t\t}\n\t\treturn handler;\n\t}\n\n\tops: Op[];\n\tconstructor( ops?: Op[] | { ops: Op[] } ) {\n\t\t// Assume we are given a well formed ops\n\t\tif ( Array.isArray( ops ) ) {\n\t\t\tthis.ops = ops;\n\t\t} else if (\n\t\t\tops !== null &&\n\t\t\tops !== undefined &&\n\t\t\tArray.isArray( ops.ops )\n\t\t) {\n\t\t\tthis.ops = ops.ops;\n\t\t} else {\n\t\t\tthis.ops = [];\n\t\t}\n\t}\n\n\tinsert(\n\t\targ: string | Record< string, unknown >,\n\t\tattributes?: AttributeMap | null\n\t): this {\n\t\tconst newOp: Op = {};\n\t\tif ( typeof arg === 'string' && arg.length === 0 ) {\n\t\t\treturn this;\n\t\t}\n\t\tnewOp.insert = arg;\n\t\tif (\n\t\t\tattributes !== null &&\n\t\t\tattributes !== undefined &&\n\t\t\ttypeof attributes === 'object' &&\n\t\t\tObject.keys( attributes ).length > 0\n\t\t) {\n\t\t\tnewOp.attributes = attributes;\n\t\t}\n\t\treturn this.push( newOp );\n\t}\n\n\tdelete( length: number ): this {\n\t\tif ( length <= 0 ) {\n\t\t\treturn this;\n\t\t}\n\t\treturn this.push( { delete: length } );\n\t}\n\n\tretain(\n\t\tlength: number | Record< string, unknown >,\n\t\tattributes?: AttributeMap | null\n\t): this {\n\t\tif ( typeof length === 'number' && length <= 0 ) {\n\t\t\treturn this;\n\t\t}\n\t\tconst newOp: Op = { retain: length };\n\t\tif (\n\t\t\tattributes !== null &&\n\t\t\tattributes !== undefined &&\n\t\t\ttypeof attributes === 'object' &&\n\t\t\tObject.keys( attributes ).length > 0\n\t\t) {\n\t\t\tnewOp.attributes = attributes;\n\t\t}\n\t\treturn this.push( newOp );\n\t}\n\n\tpush( newOp: Op ): this {\n\t\tlet index = this.ops.length;\n\t\tlet lastOp = this.ops[ index - 1 ];\n\t\tnewOp = cloneDeep( newOp );\n\t\tif ( typeof lastOp === 'object' ) {\n\t\t\tif (\n\t\t\t\ttypeof newOp.delete === 'number' &&\n\t\t\t\ttypeof lastOp.delete === 'number'\n\t\t\t) {\n\t\t\t\tthis.ops[ index - 1 ] = {\n\t\t\t\t\tdelete: lastOp.delete + newOp.delete,\n\t\t\t\t};\n\t\t\t\treturn this;\n\t\t\t}\n\t\t\t// Since it does not matter if we insert before or after deleting at the same index,\n\t\t\t// always prefer to insert first\n\t\t\tif (\n\t\t\t\ttypeof lastOp.delete === 'number' &&\n\t\t\t\tnewOp.insert !== null &&\n\t\t\t\tnewOp.insert !== undefined\n\t\t\t) {\n\t\t\t\tindex -= 1;\n\t\t\t\tlastOp = this.ops[ index - 1 ];\n\t\t\t\tif ( typeof lastOp !== 'object' ) {\n\t\t\t\t\tthis.ops.unshift( newOp );\n\t\t\t\t\treturn this;\n\t\t\t\t}\n\t\t\t}\n\t\t\tif ( isEqual( newOp.attributes, lastOp.attributes ) ) {\n\t\t\t\tif (\n\t\t\t\t\ttypeof newOp.insert === 'string' &&\n\t\t\t\t\ttypeof lastOp.insert === 'string'\n\t\t\t\t) {\n\t\t\t\t\tthis.ops[ index - 1 ] = {\n\t\t\t\t\t\tinsert: lastOp.insert + newOp.insert,\n\t\t\t\t\t};\n\t\t\t\t\tif ( typeof newOp.attributes === 'object' ) {\n\t\t\t\t\t\tthis.ops[ index - 1 ].attributes = newOp.attributes;\n\t\t\t\t\t}\n\t\t\t\t\treturn this;\n\t\t\t\t} else if (\n\t\t\t\t\ttypeof newOp.retain === 'number' &&\n\t\t\t\t\ttypeof lastOp.retain === 'number'\n\t\t\t\t) {\n\t\t\t\t\tthis.ops[ index - 1 ] = {\n\t\t\t\t\t\tretain: lastOp.retain + newOp.retain,\n\t\t\t\t\t};\n\t\t\t\t\tif ( typeof newOp.attributes === 'object' ) {\n\t\t\t\t\t\tthis.ops[ index - 1 ].attributes = newOp.attributes;\n\t\t\t\t\t}\n\t\t\t\t\treturn this;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tif ( index === this.ops.length ) {\n\t\t\tthis.ops.push( newOp );\n\t\t} else {\n\t\t\tthis.ops.splice( index, 0, newOp );\n\t\t}\n\t\treturn this;\n\t}\n\n\tchop(): this {\n\t\tconst lastOp = this.ops[ this.ops.length - 1 ];\n\t\tif (\n\t\t\tlastOp &&\n\t\t\ttypeof lastOp.retain === 'number' &&\n\t\t\t! lastOp.attributes\n\t\t) {\n\t\t\tthis.ops.pop();\n\t\t}\n\t\treturn this;\n\t}\n\n\tfilter( predicate: ( op: Op, index: number ) => boolean ): Op[] {\n\t\treturn this.ops.filter( predicate );\n\t}\n\n\tforEach( predicate: ( op: Op, index: number ) => void ): void {\n\t\tthis.ops.forEach( predicate );\n\t}\n\n\tmap< T >( predicate: ( op: Op, index: number ) => T ): T[] {\n\t\treturn this.ops.map( predicate );\n\t}\n\n\tpartition( predicate: ( op: Op ) => boolean ): [ Op[], Op[] ] {\n\t\tconst passed: Op[] = [];\n\t\tconst failed: Op[] = [];\n\t\tthis.forEach( ( op ) => {\n\t\t\tconst target = predicate( op ) ? passed : failed;\n\t\t\ttarget.push( op );\n\t\t} );\n\t\treturn [ passed, failed ];\n\t}\n\n\treduce< T >(\n\t\tpredicate: ( accum: T, curr: Op, index: number ) => T,\n\t\tinitialValue: T\n\t): T {\n\t\treturn this.ops.reduce( predicate, initialValue );\n\t}\n\n\tchangeLength(): number {\n\t\treturn this.reduce( ( length, elem ) => {\n\t\t\tif ( elem.insert ) {\n\t\t\t\treturn length + Op.length( elem );\n\t\t\t} else if ( elem.delete ) {\n\t\t\t\treturn length - elem.delete;\n\t\t\t}\n\t\t\treturn length;\n\t\t}, 0 );\n\t}\n\n\tlength(): number {\n\t\treturn this.reduce( ( length, elem ) => {\n\t\t\treturn length + Op.length( elem );\n\t\t}, 0 );\n\t}\n\n\tslice( start = 0, end = Infinity ): Delta {\n\t\tconst ops = [];\n\t\tconst iter = new OpIterator( this.ops );\n\t\tlet index = 0;\n\t\twhile ( index < end && iter.hasNext() ) {\n\t\t\tlet nextOp;\n\t\t\tif ( index < start ) {\n\t\t\t\tnextOp = iter.next( start - index );\n\t\t\t} else {\n\t\t\t\tnextOp = iter.next( end - index );\n\t\t\t\tops.push( nextOp );\n\t\t\t}\n\t\t\tindex += Op.length( nextOp );\n\t\t}\n\t\treturn new Delta( ops );\n\t}\n\n\tcompose( other: Delta ): Delta {\n\t\tconst thisIter = new OpIterator( this.ops );\n\t\tconst otherIter = new OpIterator( other.ops );\n\t\tconst ops = [];\n\t\tconst firstOther = otherIter.peek();\n\t\tif (\n\t\t\tfirstOther !== null &&\n\t\t\tfirstOther !== undefined &&\n\t\t\ttypeof firstOther.retain === 'number' &&\n\t\t\t( firstOther.attributes === null ||\n\t\t\t\tfirstOther.attributes === undefined )\n\t\t) {\n\t\t\tlet firstLeft = firstOther.retain;\n\t\t\twhile (\n\t\t\t\tthisIter.peekType() === 'insert' &&\n\t\t\t\tthisIter.peekLength() <= firstLeft\n\t\t\t) {\n\t\t\t\tfirstLeft -= thisIter.peekLength();\n\t\t\t\tops.push( thisIter.next() );\n\t\t\t}\n\t\t\tif ( firstOther.retain - firstLeft > 0 ) {\n\t\t\t\totherIter.next( firstOther.retain - firstLeft );\n\t\t\t}\n\t\t}\n\t\tconst delta = new Delta( ops );\n\t\twhile ( thisIter.hasNext() || otherIter.hasNext() ) {\n\t\t\tif ( otherIter.peekType() === 'insert' ) {\n\t\t\t\tdelta.push( otherIter.next() );\n\t\t\t} else if ( thisIter.peekType() === 'delete' ) {\n\t\t\t\tdelta.push( thisIter.next() );\n\t\t\t} else {\n\t\t\t\tconst length = Math.min(\n\t\t\t\t\tthisIter.peekLength(),\n\t\t\t\t\totherIter.peekLength()\n\t\t\t\t);\n\t\t\t\tconst thisOp = thisIter.next( length );\n\t\t\t\tconst otherOp = otherIter.next( length );\n\t\t\t\tif ( otherOp.retain ) {\n\t\t\t\t\tconst newOp: Op = {};\n\t\t\t\t\tif ( typeof thisOp.retain === 'number' ) {\n\t\t\t\t\t\tnewOp.retain =\n\t\t\t\t\t\t\ttypeof otherOp.retain === 'number'\n\t\t\t\t\t\t\t\t? length\n\t\t\t\t\t\t\t\t: otherOp.retain;\n\t\t\t\t\t} else if ( typeof otherOp.retain === 'number' ) {\n\t\t\t\t\t\tif (\n\t\t\t\t\t\t\tthisOp.retain === null ||\n\t\t\t\t\t\t\tthisOp.retain === undefined\n\t\t\t\t\t\t) {\n\t\t\t\t\t\t\tnewOp.insert = thisOp.insert;\n\t\t\t\t\t\t} else {\n\t\t\t\t\t\t\tnewOp.retain = thisOp.retain;\n\t\t\t\t\t\t}\n\t\t\t\t\t} else {\n\t\t\t\t\t\tconst action =\n\t\t\t\t\t\t\tthisOp.retain === null ||\n\t\t\t\t\t\t\tthisOp.retain === undefined\n\t\t\t\t\t\t\t\t? 'insert'\n\t\t\t\t\t\t\t\t: 'retain';\n\t\t\t\t\t\tconst [ embedType, thisData, otherData ] =\n\t\t\t\t\t\t\tgetEmbedTypeAndData(\n\t\t\t\t\t\t\t\tthisOp[ action ],\n\t\t\t\t\t\t\t\totherOp.retain\n\t\t\t\t\t\t\t);\n\t\t\t\t\t\tconst handler = Delta.getHandler( embedType );\n\t\t\t\t\t\tnewOp[ action ] = {\n\t\t\t\t\t\t\t[ embedType ]: handler.compose(\n\t\t\t\t\t\t\t\tthisData,\n\t\t\t\t\t\t\t\totherData,\n\t\t\t\t\t\t\t\taction === 'retain'\n\t\t\t\t\t\t\t),\n\t\t\t\t\t\t};\n\t\t\t\t\t}\n\t\t\t\t\t// Preserve null when composing with a retain, otherwise remove it for inserts\n\t\t\t\t\tconst attributes = AttributeMap.compose(\n\t\t\t\t\t\tthisOp.attributes,\n\t\t\t\t\t\totherOp.attributes,\n\t\t\t\t\t\ttypeof thisOp.retain === 'number'\n\t\t\t\t\t);\n\t\t\t\t\tif ( attributes ) {\n\t\t\t\t\t\tnewOp.attributes = attributes;\n\t\t\t\t\t}\n\t\t\t\t\tdelta.push( newOp );\n\n\t\t\t\t\t// Optimization if rest of other is just retain\n\t\t\t\t\tif (\n\t\t\t\t\t\t! otherIter.hasNext() &&\n\t\t\t\t\t\tisEqual( delta.ops[ delta.ops.length - 1 ], newOp )\n\t\t\t\t\t) {\n\t\t\t\t\t\tconst rest = new Delta( thisIter.rest() );\n\t\t\t\t\t\treturn delta.concat( rest ).chop();\n\t\t\t\t\t}\n\n\t\t\t\t\t// Other op should be delete, we could be an insert or retain\n\t\t\t\t\t// Insert + delete cancels out\n\t\t\t\t} else if (\n\t\t\t\t\ttypeof otherOp.delete === 'number' &&\n\t\t\t\t\t( typeof thisOp.retain === 'number' ||\n\t\t\t\t\t\t( typeof thisOp.retain === 'object' &&\n\t\t\t\t\t\t\tthisOp.retain !== null ) )\n\t\t\t\t) {\n\t\t\t\t\tdelta.push( otherOp );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\treturn delta.chop();\n\t}\n\n\tconcat( other: Delta ): Delta {\n\t\tconst delta = new Delta( this.ops.slice() );\n\t\tif ( other.ops.length > 0 ) {\n\t\t\tdelta.push( other.ops[ 0 ] );\n\t\t\tdelta.ops = delta.ops.concat( other.ops.slice( 1 ) );\n\t\t}\n\t\treturn delta;\n\t}\n\n\tdiff( other: Delta ): Delta {\n\t\tif ( this.ops === other.ops ) {\n\t\t\treturn new Delta();\n\t\t}\n\t\tconst strings = this.deltasToStrings( other );\n\t\tconst diffResult = diffChars( strings[ 0 ], strings[ 1 ] );\n\t\tconst thisIter = new OpIterator( this.ops );\n\t\tconst otherIter = new OpIterator( other.ops );\n\t\tconst retDelta = this.convertChangesToDelta(\n\t\t\tdiffResult,\n\t\t\tthisIter,\n\t\t\totherIter\n\t\t);\n\n\t\treturn retDelta.chop();\n\t}\n\n\teachLine(\n\t\tpredicate: (\n\t\t\tline: Delta,\n\t\t\tattributes: AttributeMap,\n\t\t\tindex: number\n\t\t) => boolean | void,\n\t\tnewline = '\\n'\n\t): void {\n\t\tconst iter = new OpIterator( this.ops );\n\t\tlet line = new Delta();\n\t\tlet i = 0;\n\t\twhile ( iter.hasNext() ) {\n\t\t\tif ( iter.peekType() !== 'insert' ) {\n\t\t\t\treturn;\n\t\t\t}\n\t\t\tconst thisOp = iter.peek();\n\t\t\tconst start = Op.length( thisOp ) - iter.peekLength();\n\t\t\tconst index =\n\t\t\t\ttypeof thisOp.insert === 'string'\n\t\t\t\t\t? thisOp.insert.indexOf( newline, start ) - start\n\t\t\t\t\t: -1;\n\t\t\tif ( index < 0 ) {\n\t\t\t\tline.push( iter.next() );\n\t\t\t} else if ( index > 0 ) {\n\t\t\t\tline.push( iter.next( index ) );\n\t\t\t} else {\n\t\t\t\tif (\n\t\t\t\t\tpredicate( line, iter.next( 1 ).attributes || {}, i ) ===\n\t\t\t\t\tfalse\n\t\t\t\t) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t\ti += 1;\n\t\t\t\tline = new Delta();\n\t\t\t}\n\t\t}\n\t\tif ( line.length() > 0 ) {\n\t\t\tpredicate( line, {}, i );\n\t\t}\n\t}\n\n\tinvert( base: Delta ): Delta {\n\t\tconst inverted = new Delta();\n\t\tthis.reduce( ( baseIndex, op ) => {\n\t\t\tif ( op.insert ) {\n\t\t\t\tinverted.delete( Op.length( op ) );\n\t\t\t} else if (\n\t\t\t\ttypeof op.retain === 'number' &&\n\t\t\t\t( op.attributes === null || op.attributes === undefined )\n\t\t\t) {\n\t\t\t\tinverted.retain( op.retain );\n\t\t\t\treturn baseIndex + op.retain;\n\t\t\t} else if ( op.delete || typeof op.retain === 'number' ) {\n\t\t\t\tconst length = ( op.delete || op.retain ) as number;\n\t\t\t\tconst slice = base.slice( baseIndex, baseIndex + length );\n\t\t\t\tslice.forEach( ( baseOp ) => {\n\t\t\t\t\tif ( op.delete ) {\n\t\t\t\t\t\tinverted.push( baseOp );\n\t\t\t\t\t} else if ( op.retain && op.attributes ) {\n\t\t\t\t\t\tinverted.retain(\n\t\t\t\t\t\t\tOp.length( baseOp ),\n\t\t\t\t\t\t\tAttributeMap.invert(\n\t\t\t\t\t\t\t\top.attributes,\n\t\t\t\t\t\t\t\tbaseOp.attributes\n\t\t\t\t\t\t\t)\n\t\t\t\t\t\t);\n\t\t\t\t\t}\n\t\t\t\t} );\n\t\t\t\treturn baseIndex + length;\n\t\t\t} else if ( typeof op.retain === 'object' && op.retain !== null ) {\n\t\t\t\tconst slice = base.slice( baseIndex, baseIndex + 1 );\n\t\t\t\tconst baseOp = new OpIterator( slice.ops ).next();\n\t\t\t\tconst [ embedType, opData, baseOpData ] = getEmbedTypeAndData(\n\t\t\t\t\top.retain,\n\t\t\t\t\tbaseOp.insert\n\t\t\t\t);\n\t\t\t\tconst handler = Delta.getHandler( embedType );\n\t\t\t\tinverted.retain(\n\t\t\t\t\t{ [ embedType ]: handler.invert( opData, baseOpData ) },\n\t\t\t\t\tAttributeMap.invert( op.attributes, baseOp.attributes )\n\t\t\t\t);\n\t\t\t\treturn baseIndex + 1;\n\t\t\t}\n\t\t\treturn baseIndex;\n\t\t}, 0 );\n\t\treturn inverted.chop();\n\t}\n\n\ttransform( index: number, priority?: boolean ): number;\n\ttransform( other: Delta, priority?: boolean ): Delta;\n\ttransform( arg: number | Delta, priority = false ): typeof arg {\n\t\tpriority = !! priority;\n\t\tif ( typeof arg === 'number' ) {\n\t\t\treturn this.transformPosition( arg, priority );\n\t\t}\n\t\tconst other: Delta = arg;\n\t\tconst thisIter = new OpIterator( this.ops );\n\t\tconst otherIter = new OpIterator( other.ops );\n\t\tconst delta = new Delta();\n\t\twhile ( thisIter.hasNext() || otherIter.hasNext() ) {\n\t\t\tif (\n\t\t\t\tthisIter.peekType() === 'insert' &&\n\t\t\t\t( priority || otherIter.peekType() !== 'insert' )\n\t\t\t) {\n\t\t\t\tdelta.retain( Op.length( thisIter.next() ) );\n\t\t\t} else if ( otherIter.peekType() === 'insert' ) {\n\t\t\t\tdelta.push( otherIter.next() );\n\t\t\t} else {\n\t\t\t\tconst length = Math.min(\n\t\t\t\t\tthisIter.peekLength(),\n\t\t\t\t\totherIter.peekLength()\n\t\t\t\t);\n\t\t\t\tconst thisOp = thisIter.next( length );\n\t\t\t\tconst otherOp = otherIter.next( length );\n\t\t\t\tif ( thisOp.delete ) {\n\t\t\t\t\t// Our delete either makes their delete redundant or removes their retain\n\t\t\t\t\tcontinue;\n\t\t\t\t} else if ( otherOp.delete ) {\n\t\t\t\t\tdelta.push( otherOp );\n\t\t\t\t} else {\n\t\t\t\t\tconst thisData = thisOp.retain;\n\t\t\t\t\tconst otherData = otherOp.retain;\n\t\t\t\t\tlet transformedData: Op[ 'retain' ] =\n\t\t\t\t\t\ttypeof otherData === 'object' && otherData !== null\n\t\t\t\t\t\t\t? otherData\n\t\t\t\t\t\t\t: length;\n\t\t\t\t\tif (\n\t\t\t\t\t\ttypeof thisData === 'object' &&\n\t\t\t\t\t\tthisData !== null &&\n\t\t\t\t\t\ttypeof otherData === 'object' &&\n\t\t\t\t\t\totherData !== null\n\t\t\t\t\t) {\n\t\t\t\t\t\tconst embedType = Object.keys( thisData )[ 0 ];\n\t\t\t\t\t\tif ( embedType === Object.keys( otherData )[ 0 ] ) {\n\t\t\t\t\t\t\tconst handler = Delta.getHandler( embedType );\n\t\t\t\t\t\t\tif ( handler ) {\n\t\t\t\t\t\t\t\ttransformedData = {\n\t\t\t\t\t\t\t\t\t[ embedType ]: handler.transform(\n\t\t\t\t\t\t\t\t\t\tthisData[ embedType ],\n\t\t\t\t\t\t\t\t\t\totherData[ embedType ],\n\t\t\t\t\t\t\t\t\t\tpriority\n\t\t\t\t\t\t\t\t\t),\n\t\t\t\t\t\t\t\t};\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\n\t\t\t\t\t// We retain either their retain or insert\n\t\t\t\t\tdelta.retain(\n\t\t\t\t\t\ttransformedData,\n\t\t\t\t\t\tAttributeMap.transform(\n\t\t\t\t\t\t\tthisOp.attributes,\n\t\t\t\t\t\t\totherOp.attributes,\n\t\t\t\t\t\t\tpriority\n\t\t\t\t\t\t)\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\treturn delta.chop();\n\t}\n\n\ttransformPosition( index: number, priority = false ): number {\n\t\tpriority = !! priority;\n\t\tconst thisIter = new OpIterator( this.ops );\n\t\tlet offset = 0;\n\t\twhile ( thisIter.hasNext() && offset <= index ) {\n\t\t\tconst length = thisIter.peekLength();\n\t\t\tconst nextType = thisIter.peekType();\n\t\t\tthisIter.next();\n\t\t\tif ( nextType === 'delete' ) {\n\t\t\t\tindex -= Math.min( length, index - offset );\n\t\t\t\tcontinue;\n\t\t\t} else if (\n\t\t\t\tnextType === 'insert' &&\n\t\t\t\t( offset < index || ! priority )\n\t\t\t) {\n\t\t\t\tindex += length;\n\t\t\t}\n\t\t\toffset += length;\n\t\t}\n\t\treturn index;\n\t}\n\n\t/**\n\t * Given a Delta and a cursor position, do a diff and attempt to adjust\n\t * the diff to place insertions or deletions at the cursor position.\n\t *\n\t * @param other             - The other Delta to diff against.\n\t * @param cursorAfterChange - The cursor position index after the change.\n\t * @return A Delta that attempts to place insertions or deletions at the cursor position.\n\t */\n\tdiffWithCursor( other: Delta, cursorAfterChange: number | null ): Delta {\n\t\tif ( this.ops === other.ops ) {\n\t\t\treturn new Delta();\n\t\t} else if ( cursorAfterChange === null ) {\n\t\t\t// If no cursor position is provided, do a regular diff.\n\t\t\treturn this.diff( other );\n\t\t}\n\n\t\tconst strings = this.deltasToStrings( other );\n\t\tlet diffs = diffChars( strings[ 0 ], strings[ 1 ] );\n\t\tlet lastDiffPosition = 0;\n\t\tconst adjustedDiffs: Change[] = [];\n\n\t\tfor ( let i = 0; i < diffs.length; i++ ) {\n\t\t\tconst diff = diffs[ i ];\n\n\t\t\tconst segmentStart = lastDiffPosition;\n\t\t\tconst segmentEnd = lastDiffPosition + ( diff.count ?? 0 );\n\t\t\tconst isCursorInSegment =\n\t\t\t\tcursorAfterChange > segmentStart &&\n\t\t\t\tcursorAfterChange <= segmentEnd;\n\n\t\t\tconst isUnchangedSegment = ! diff.added && ! diff.removed;\n\t\t\tconst isRemovalSegment = diff.removed && ! diff.added;\n\n\t\t\tconst nextDiff = diffs[ i + 1 ];\n\t\t\tconst isNextDiffAnInsert =\n\t\t\t\tnextDiff && nextDiff.added && ! nextDiff.removed;\n\n\t\t\t// Path 1: Look-ahead strategy\n\t\t\t// If the position of the cursor is in an \"unchanged\" segment, but there's an insertion\n\t\t\t// right after this section, then the insertion has likely been placed in\n\t\t\t// the incorrect spot, and we can move the insertion to the position of the cursor.\n\t\t\tif (\n\t\t\t\tisUnchangedSegment &&\n\t\t\t\tisCursorInSegment &&\n\t\t\t\tisNextDiffAnInsert\n\t\t\t) {\n\t\t\t\tconst movedSegments = this.tryMoveInsertionToCursor(\n\t\t\t\t\tdiff,\n\t\t\t\t\tnextDiff,\n\t\t\t\t\tcursorAfterChange,\n\t\t\t\t\tsegmentStart\n\t\t\t\t);\n\n\t\t\t\tif ( movedSegments ) {\n\t\t\t\t\tadjustedDiffs.push( ...movedSegments );\n\t\t\t\t\t// Skip the next diff since we've already consumed it\n\t\t\t\t\ti++;\n\t\t\t\t\tlastDiffPosition = segmentEnd;\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Path 2: Look-back strategy\n\t\t\t// Handle removals by checking if cursor was in the previous unchanged segment\n\t\t\tif ( isRemovalSegment ) {\n\t\t\t\tconst movedSegments = this.tryMoveDeletionToCursor(\n\t\t\t\t\tdiff,\n\t\t\t\t\tadjustedDiffs,\n\t\t\t\t\tcursorAfterChange,\n\t\t\t\t\tlastDiffPosition\n\t\t\t\t);\n\n\t\t\t\tif ( movedSegments ) {\n\t\t\t\t\t// Remove the previous unchanged segment from adjustedDiffs\n\t\t\t\t\tadjustedDiffs.pop();\n\t\t\t\t\tadjustedDiffs.push( ...movedSegments );\n\t\t\t\t\tlastDiffPosition += diff.count ?? 0;\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Path 3: Do nothing - add diff as-is\n\t\t\tadjustedDiffs.push( diff );\n\t\t\tif ( ! diff.added ) {\n\t\t\t\tlastDiffPosition += diff.count ?? 0;\n\t\t\t}\n\t\t}\n\n\t\tdiffs = adjustedDiffs;\n\n\t\tconst thisIter = new OpIterator( this.ops );\n\t\tconst otherIter = new OpIterator( other.ops );\n\t\tconst retDelta = this.convertChangesToDelta(\n\t\t\tdiffs,\n\t\t\tthisIter,\n\t\t\totherIter\n\t\t);\n\n\t\treturn retDelta.chop();\n\t}\n\n\t/**\n\t * Try to move an insertion operation from after an unchanged segment to the cursor position within it.\n\t * This is a \"look-ahead\" strategy.\n\t *\n\t * @param diff              - The current unchanged diff segment.\n\t * @param nextDiff          - The next diff segment (expected to be an insertion).\n\t * @param cursorAfterChange - The cursor position after the change.\n\t * @param segmentStart      - The start position of the current segment.\n\t * @return An array of adjusted diff segments if the insertion was successfully moved, null otherwise.\n\t */\n\tprivate tryMoveInsertionToCursor(\n\t\tdiff: Change,\n\t\tnextDiff: Change,\n\t\tcursorAfterChange: number,\n\t\tsegmentStart: number\n\t): Change[] | null {\n\t\tconst nextDiffInsert = nextDiff.value;\n\t\tconst insertLength = nextDiffInsert.length;\n\t\tconst insertOffset = cursorAfterChange - segmentStart - insertLength;\n\n\t\t// Verify that the inserted text matches the text at the cursor position\n\t\tconst textAtCursor = diff.value.substring(\n\t\t\tinsertOffset,\n\t\t\tinsertOffset + nextDiffInsert.length\n\t\t);\n\t\tconst isInsertMoveable = textAtCursor === nextDiffInsert;\n\n\t\t// The insert text matches what's at the cursor position,\n\t\t// so we can safely move the insertion to the cursor position.\n\t\tif ( ! isInsertMoveable ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// Split the current segment at the cursor\n\t\tconst beforeCursor = diff.value.substring( 0, insertOffset );\n\t\tconst afterCursor = diff.value.substring( insertOffset );\n\n\t\tconst result: Change[] = [];\n\n\t\t// Add before cursor part (if not empty)\n\t\tif ( beforeCursor.length > 0 ) {\n\t\t\tresult.push( {\n\t\t\t\tvalue: beforeCursor,\n\t\t\t\tcount: beforeCursor.length,\n\t\t\t\tadded: false,\n\t\t\t\tremoved: false,\n\t\t\t} );\n\t\t}\n\n\t\t// Add the insertion in the middle\n\t\tresult.push( nextDiff );\n\n\t\t// Add after cursor part (if not empty)\n\t\tif ( afterCursor.length > 0 ) {\n\t\t\tresult.push( {\n\t\t\t\tvalue: afterCursor,\n\t\t\t\tcount: afterCursor.length,\n\t\t\t\tadded: false,\n\t\t\t\tremoved: false,\n\t\t\t} );\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Try to move a deletion operation to the cursor position by looking back at the previous unchanged segment.\n\t * This is a \"look-back\" strategy.\n\t *\n\t * @param diff              - The current deletion diff segment.\n\t * @param adjustedDiffs     - The array of previously processed diff segments.\n\t * @param cursorAfterChange - The cursor position after the change.\n\t * @param lastDiffPosition  - The position in the document up to (but not including) the current diff.\n\t * @return An array of adjusted diff segments if the deletion was successfully moved, null otherwise.\n\t */\n\tprivate tryMoveDeletionToCursor(\n\t\tdiff: Change,\n\t\tadjustedDiffs: Change[],\n\t\tcursorAfterChange: number,\n\t\tlastDiffPosition: number\n\t): Change[] | null {\n\t\t// Check if there's a preceding unchanged segment where cursor falls\n\t\t// and the deleted characters match characters in that segment\n\t\tconst prevDiff = adjustedDiffs[ adjustedDiffs.length - 1 ];\n\n\t\tif ( ! prevDiff || prevDiff.added || prevDiff.removed ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst prevSegmentStart = lastDiffPosition - ( prevDiff.count ?? 0 );\n\t\tconst prevSegmentEnd = lastDiffPosition;\n\n\t\t// Check if cursor is within or at the end of the previous unchanged segment\n\t\tif (\n\t\t\tcursorAfterChange < prevSegmentStart ||\n\t\t\tcursorAfterChange >= prevSegmentEnd\n\t\t) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// Check if the deleted characters match the text at the cursor position\n\t\tconst deletedChars = diff.value;\n\t\tconst deleteOffset = cursorAfterChange - prevSegmentStart;\n\t\tconst textAtCursor = prevDiff.value.substring(\n\t\t\tdeleteOffset,\n\t\t\tdeleteOffset + deletedChars.length\n\t\t);\n\t\tconst canBePlacedHere = textAtCursor === deletedChars;\n\n\t\tif ( ! canBePlacedHere ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// Split the unchanged segment at the cursor and place deletion there\n\t\tconst beforeCursor = prevDiff.value.substring( 0, deleteOffset );\n\t\tconst atAndAfterCursor = prevDiff.value.substring( deleteOffset );\n\n\t\t// The deletion should consume characters starting at cursor\n\t\tconst deletionLength = diff.count ?? 0;\n\t\tconst afterDeletion = atAndAfterCursor.substring( deletionLength );\n\n\t\tconst result: Change[] = [];\n\n\t\t// Add before cursor part (if not empty)\n\t\tif ( beforeCursor.length > 0 ) {\n\t\t\tresult.push( {\n\t\t\t\tvalue: beforeCursor,\n\t\t\t\tcount: beforeCursor.length,\n\t\t\t\tadded: false,\n\t\t\t\tremoved: false,\n\t\t\t} );\n\t\t}\n\n\t\t// Add the deletion\n\t\tresult.push( diff );\n\n\t\t// Add after deletion part (if not empty)\n\t\tif ( afterDeletion.length > 0 ) {\n\t\t\tresult.push( {\n\t\t\t\tvalue: afterDeletion,\n\t\t\t\tcount: afterDeletion.length,\n\t\t\t\tadded: false,\n\t\t\t\tremoved: false,\n\t\t\t} );\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Convert two Deltas to string representations for diffing.\n\t *\n\t * @param other - The other Delta to convert.\n\t * @return A tuple of [thisString, otherString].\n\t */\n\tprivate deltasToStrings( other: Delta ): [ string, string ] {\n\t\treturn [ this, other ].map( ( delta ) => {\n\t\t\treturn delta\n\t\t\t\t.map( ( op ) => {\n\t\t\t\t\tif ( op.insert !== null || op.insert !== undefined ) {\n\t\t\t\t\t\treturn typeof op.insert === 'string'\n\t\t\t\t\t\t\t? op.insert\n\t\t\t\t\t\t\t: NULL_CHARACTER;\n\t\t\t\t\t}\n\t\t\t\t\tconst prep = delta === other ? 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embedType || embedType !== Object.keys( b )[ 0 ] ) {\n\t\tthrow new Error(\n\t\t\t`embed types not matched: ${ embedType } != ${\n\t\t\t\tObject.keys( b )[ 0 ]\n\t\t\t}`\n\t\t);\n\t}\n\treturn [ embedType, a[ embedType ], b[ embedType ] ];\n};\n\nclass Delta {\n\tstatic Op = Op;\n\tstatic OpIterator = OpIterator;\n\tstatic AttributeMap = AttributeMap;\n\tprivate static handlers: {\n\t\t[ embedType: string ]: EmbedHandler< unknown >;\n\t} = {};\n\n\tstatic registerEmbed< T >(\n\t\tembedType: string,\n\t\thandler: EmbedHandler< T >\n\t): void {\n\t\tthis.handlers[ embedType ] = handler as EmbedHandler< unknown >;\n\t}\n\n\tstatic unregisterEmbed( embedType: string ): void {\n\t\tdelete this.handlers[ embedType ];\n\t}\n\n\tprivate static getHandler( embedType: string ): EmbedHandler< unknown > {\n\t\tconst handler = this.handlers[ embedType ];\n\t\tif ( ! handler ) {\n\t\t\tthrow new Error( `no handlers for embed type \"${ embedType }\"` );\n\t\t}\n\t\treturn handler;\n\t}\n\n\tops: Op[];\n\tconstructor( ops?: Op[] | { ops: Op[] } ) {\n\t\t// Assume we are given a well formed ops\n\t\tif ( Array.isArray( ops ) ) {\n\t\t\tthis.ops = ops;\n\t\t} else if (\n\t\t\tops !== null &&\n\t\t\tops !== undefined &&\n\t\t\tArray.isArray( ops.ops )\n\t\t) {\n\t\t\tthis.ops = ops.ops;\n\t\t} else {\n\t\t\tthis.ops = [];\n\t\t}\n\t}\n\n\tinsert(\n\t\targ: string | Record< string, unknown >,\n\t\tattributes?: AttributeMap | null\n\t): this {\n\t\tconst newOp: Op = {};\n\t\tif ( typeof arg === 'string' && arg.length === 0 ) {\n\t\t\treturn this;\n\t\t}\n\t\tnewOp.insert = arg;\n\t\tif (\n\t\t\tattributes !== null &&\n\t\t\tattributes !== undefined &&\n\t\t\ttypeof attributes === 'object' &&\n\t\t\tObject.keys( attributes ).length > 0\n\t\t) {\n\t\t\tnewOp.attributes = attributes;\n\t\t}\n\t\treturn this.push( newOp );\n\t}\n\n\tdelete( length: number ): this {\n\t\tif ( length <= 0 ) {\n\t\t\treturn this;\n\t\t}\n\t\treturn this.push( { delete: length } );\n\t}\n\n\tretain(\n\t\tlength: number | Record< string, unknown >,\n\t\tattributes?: AttributeMap | null\n\t): this {\n\t\tif ( typeof length === 'number' && length <= 0 ) {\n\t\t\treturn this;\n\t\t}\n\t\tconst newOp: Op = { retain: length };\n\t\tif (\n\t\t\tattributes !== null &&\n\t\t\tattributes !== undefined &&\n\t\t\ttypeof attributes === 'object' &&\n\t\t\tObject.keys( attributes ).length > 0\n\t\t) {\n\t\t\tnewOp.attributes = attributes;\n\t\t}\n\t\treturn this.push( newOp );\n\t}\n\n\tpush( newOp: Op ): this {\n\t\tlet index = this.ops.length;\n\t\tlet lastOp = this.ops[ index - 1 ];\n\t\tnewOp = cloneDeep( newOp );\n\t\tif ( typeof lastOp === 'object' ) {\n\t\t\tif (\n\t\t\t\ttypeof newOp.delete === 'number' &&\n\t\t\t\ttypeof lastOp.delete === 'number'\n\t\t\t) {\n\t\t\t\tthis.ops[ index - 1 ] = {\n\t\t\t\t\tdelete: lastOp.delete + newOp.delete,\n\t\t\t\t};\n\t\t\t\treturn this;\n\t\t\t}\n\t\t\t// Since it does not matter if we insert before or after deleting at the same index,\n\t\t\t// always prefer to insert first\n\t\t\tif (\n\t\t\t\ttypeof lastOp.delete === 'number' &&\n\t\t\t\tnewOp.insert !== null &&\n\t\t\t\tnewOp.insert !== undefined\n\t\t\t) {\n\t\t\t\tindex -= 1;\n\t\t\t\tlastOp = this.ops[ index - 1 ];\n\t\t\t\tif ( typeof lastOp !== 'object' ) {\n\t\t\t\t\tthis.ops.unshift( newOp );\n\t\t\t\t\treturn this;\n\t\t\t\t}\n\t\t\t}\n\t\t\tif ( isEqual( newOp.attributes, lastOp.attributes ) ) {\n\t\t\t\tif (\n\t\t\t\t\ttypeof newOp.insert === 'string' &&\n\t\t\t\t\ttypeof lastOp.insert === 'string'\n\t\t\t\t) {\n\t\t\t\t\tthis.ops[ index - 1 ] = {\n\t\t\t\t\t\tinsert: lastOp.insert + newOp.insert,\n\t\t\t\t\t};\n\t\t\t\t\tif ( typeof newOp.attributes === 'object' ) {\n\t\t\t\t\t\tthis.ops[ index - 1 ].attributes = newOp.attributes;\n\t\t\t\t\t}\n\t\t\t\t\treturn this;\n\t\t\t\t} else if (\n\t\t\t\t\ttypeof newOp.retain === 'number' &&\n\t\t\t\t\ttypeof lastOp.retain === 'number'\n\t\t\t\t) {\n\t\t\t\t\tthis.ops[ index - 1 ] = {\n\t\t\t\t\t\tretain: lastOp.retain + newOp.retain,\n\t\t\t\t\t};\n\t\t\t\t\tif ( typeof newOp.attributes === 'object' ) {\n\t\t\t\t\t\tthis.ops[ index - 1 ].attributes = newOp.attributes;\n\t\t\t\t\t}\n\t\t\t\t\treturn this;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tif ( index === this.ops.length ) {\n\t\t\tthis.ops.push( newOp );\n\t\t} else {\n\t\t\tthis.ops.splice( index, 0, newOp );\n\t\t}\n\t\treturn this;\n\t}\n\n\tchop(): this {\n\t\tconst lastOp = this.ops[ this.ops.length - 1 ];\n\t\tif (\n\t\t\tlastOp &&\n\t\t\ttypeof lastOp.retain === 'number' &&\n\t\t\t! lastOp.attributes\n\t\t) {\n\t\t\tthis.ops.pop();\n\t\t}\n\t\treturn this;\n\t}\n\n\tfilter( predicate: ( op: Op, index: number ) => boolean ): Op[] {\n\t\treturn this.ops.filter( predicate );\n\t}\n\n\tforEach( predicate: ( op: Op, index: number ) => void ): void {\n\t\tthis.ops.forEach( predicate );\n\t}\n\n\tmap< T >( predicate: ( op: Op, index: number ) => T ): T[] {\n\t\treturn this.ops.map( predicate );\n\t}\n\n\tpartition( predicate: ( op: Op ) => boolean ): [ Op[], Op[] ] {\n\t\tconst passed: Op[] = [];\n\t\tconst failed: Op[] = [];\n\t\tthis.forEach( ( op ) => {\n\t\t\tconst target = predicate( op ) ? passed : failed;\n\t\t\ttarget.push( op );\n\t\t} );\n\t\treturn [ passed, failed ];\n\t}\n\n\treduce< T >(\n\t\tpredicate: ( accum: T, curr: Op, index: number ) => T,\n\t\tinitialValue: T\n\t): T {\n\t\treturn this.ops.reduce( predicate, initialValue );\n\t}\n\n\tchangeLength(): number {\n\t\treturn this.reduce( ( length, elem ) => {\n\t\t\tif ( elem.insert ) {\n\t\t\t\treturn length + Op.length( elem );\n\t\t\t} else if ( elem.delete ) {\n\t\t\t\treturn length - elem.delete;\n\t\t\t}\n\t\t\treturn length;\n\t\t}, 0 );\n\t}\n\n\tlength(): number {\n\t\treturn this.reduce( ( length, elem ) => {\n\t\t\treturn length + Op.length( elem );\n\t\t}, 0 );\n\t}\n\n\tslice( start = 0, end = Infinity ): Delta {\n\t\tconst ops = [];\n\t\tconst iter = new OpIterator( this.ops );\n\t\tlet index = 0;\n\t\twhile ( index < end && iter.hasNext() ) {\n\t\t\tlet nextOp;\n\t\t\tif ( index < start ) {\n\t\t\t\tnextOp = iter.next( start - index );\n\t\t\t} else {\n\t\t\t\tnextOp = iter.next( end - index );\n\t\t\t\tops.push( nextOp );\n\t\t\t}\n\t\t\tindex += Op.length( nextOp );\n\t\t}\n\t\treturn new Delta( ops );\n\t}\n\n\tcompose( other: Delta ): Delta {\n\t\tconst thisIter = new OpIterator( this.ops );\n\t\tconst otherIter = new OpIterator( other.ops );\n\t\tconst ops = [];\n\t\tconst firstOther = otherIter.peek();\n\t\tif (\n\t\t\tfirstOther !== null &&\n\t\t\tfirstOther !== undefined &&\n\t\t\ttypeof firstOther.retain === 'number' &&\n\t\t\t( firstOther.attributes === null ||\n\t\t\t\tfirstOther.attributes === undefined )\n\t\t) {\n\t\t\tlet firstLeft = firstOther.retain;\n\t\t\twhile (\n\t\t\t\tthisIter.peekType() === 'insert' &&\n\t\t\t\tthisIter.peekLength() <= firstLeft\n\t\t\t) {\n\t\t\t\tfirstLeft -= thisIter.peekLength();\n\t\t\t\tops.push( thisIter.next() );\n\t\t\t}\n\t\t\tif ( firstOther.retain - firstLeft > 0 ) {\n\t\t\t\totherIter.next( firstOther.retain - firstLeft );\n\t\t\t}\n\t\t}\n\t\tconst delta = new Delta( ops );\n\t\twhile ( thisIter.hasNext() || otherIter.hasNext() ) {\n\t\t\tif ( otherIter.peekType() === 'insert' ) {\n\t\t\t\tdelta.push( otherIter.next() );\n\t\t\t} else if ( thisIter.peekType() === 'delete' ) {\n\t\t\t\tdelta.push( thisIter.next() );\n\t\t\t} else {\n\t\t\t\tconst length = Math.min(\n\t\t\t\t\tthisIter.peekLength(),\n\t\t\t\t\totherIter.peekLength()\n\t\t\t\t);\n\t\t\t\tconst thisOp = thisIter.next( length );\n\t\t\t\tconst otherOp = otherIter.next( length );\n\t\t\t\tif ( otherOp.retain ) {\n\t\t\t\t\tconst newOp: Op = {};\n\t\t\t\t\tif ( typeof thisOp.retain === 'number' ) {\n\t\t\t\t\t\tnewOp.retain =\n\t\t\t\t\t\t\ttypeof otherOp.retain === 'number'\n\t\t\t\t\t\t\t\t? length\n\t\t\t\t\t\t\t\t: otherOp.retain;\n\t\t\t\t\t} else if ( typeof otherOp.retain === 'number' ) {\n\t\t\t\t\t\tif (\n\t\t\t\t\t\t\tthisOp.retain === null ||\n\t\t\t\t\t\t\tthisOp.retain === undefined\n\t\t\t\t\t\t) {\n\t\t\t\t\t\t\tnewOp.insert = thisOp.insert;\n\t\t\t\t\t\t} else {\n\t\t\t\t\t\t\tnewOp.retain = thisOp.retain;\n\t\t\t\t\t\t}\n\t\t\t\t\t} else {\n\t\t\t\t\t\tconst action =\n\t\t\t\t\t\t\tthisOp.retain === null ||\n\t\t\t\t\t\t\tthisOp.retain === undefined\n\t\t\t\t\t\t\t\t? 'insert'\n\t\t\t\t\t\t\t\t: 'retain';\n\t\t\t\t\t\tconst [ embedType, thisData, otherData ] =\n\t\t\t\t\t\t\tgetEmbedTypeAndData(\n\t\t\t\t\t\t\t\tthisOp[ action ],\n\t\t\t\t\t\t\t\totherOp.retain\n\t\t\t\t\t\t\t);\n\t\t\t\t\t\tconst handler = Delta.getHandler( embedType );\n\t\t\t\t\t\tnewOp[ action ] = {\n\t\t\t\t\t\t\t[ embedType ]: handler.compose(\n\t\t\t\t\t\t\t\tthisData,\n\t\t\t\t\t\t\t\totherData,\n\t\t\t\t\t\t\t\taction === 'retain'\n\t\t\t\t\t\t\t),\n\t\t\t\t\t\t};\n\t\t\t\t\t}\n\t\t\t\t\t// Preserve null when composing with a retain, otherwise remove it for inserts\n\t\t\t\t\tconst attributes = AttributeMap.compose(\n\t\t\t\t\t\tthisOp.attributes,\n\t\t\t\t\t\totherOp.attributes,\n\t\t\t\t\t\ttypeof thisOp.retain === 'number'\n\t\t\t\t\t);\n\t\t\t\t\tif ( attributes ) {\n\t\t\t\t\t\tnewOp.attributes = attributes;\n\t\t\t\t\t}\n\t\t\t\t\tdelta.push( newOp );\n\n\t\t\t\t\t// Optimization if rest of other is just retain\n\t\t\t\t\tif (\n\t\t\t\t\t\t! otherIter.hasNext() &&\n\t\t\t\t\t\tisEqual( delta.ops[ delta.ops.length - 1 ], newOp )\n\t\t\t\t\t) {\n\t\t\t\t\t\tconst rest = new Delta( thisIter.rest() );\n\t\t\t\t\t\treturn delta.concat( rest ).chop();\n\t\t\t\t\t}\n\n\t\t\t\t\t// Other op should be delete, we could be an insert or retain\n\t\t\t\t\t// Insert + delete cancels out\n\t\t\t\t} else if (\n\t\t\t\t\ttypeof otherOp.delete === 'number' &&\n\t\t\t\t\t( typeof thisOp.retain === 'number' ||\n\t\t\t\t\t\t( typeof thisOp.retain === 'object' &&\n\t\t\t\t\t\t\tthisOp.retain !== null ) )\n\t\t\t\t) {\n\t\t\t\t\tdelta.push( otherOp );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\treturn delta.chop();\n\t}\n\n\tconcat( other: Delta ): Delta {\n\t\tconst delta = new Delta( this.ops.slice() );\n\t\tif ( other.ops.length > 0 ) {\n\t\t\tdelta.push( other.ops[ 0 ] );\n\t\t\tdelta.ops = delta.ops.concat( other.ops.slice( 1 ) );\n\t\t}\n\t\treturn delta;\n\t}\n\n\tdiff( other: Delta ): Delta {\n\t\tif ( this.ops === other.ops ) {\n\t\t\treturn new Delta();\n\t\t}\n\t\tconst strings = this.deltasToStrings( other );\n\t\tconst diffResult = normalizeChangeCounts(\n\t\t\tdiffChars( strings[ 0 ], strings[ 1 ] )\n\t\t);\n\t\tconst thisIter = new OpIterator( this.ops );\n\t\tconst otherIter = new OpIterator( other.ops );\n\t\tconst retDelta = this.convertChangesToDelta(\n\t\t\tdiffResult,\n\t\t\tthisIter,\n\t\t\totherIter\n\t\t);\n\n\t\treturn retDelta.chop();\n\t}\n\n\teachLine(\n\t\tpredicate: (\n\t\t\tline: Delta,\n\t\t\tattributes: AttributeMap,\n\t\t\tindex: number\n\t\t) => boolean | void,\n\t\tnewline = '\\n'\n\t): void {\n\t\tconst iter = new OpIterator( this.ops );\n\t\tlet line = new Delta();\n\t\tlet i = 0;\n\t\twhile ( iter.hasNext() ) {\n\t\t\tif ( iter.peekType() !== 'insert' ) {\n\t\t\t\treturn;\n\t\t\t}\n\t\t\tconst thisOp = iter.peek();\n\t\t\tconst start = Op.length( thisOp ) - iter.peekLength();\n\t\t\tconst index =\n\t\t\t\ttypeof thisOp.insert === 'string'\n\t\t\t\t\t? thisOp.insert.indexOf( newline, start ) - start\n\t\t\t\t\t: -1;\n\t\t\tif ( index < 0 ) {\n\t\t\t\tline.push( iter.next() );\n\t\t\t} else if ( index > 0 ) {\n\t\t\t\tline.push( iter.next( index ) );\n\t\t\t} else {\n\t\t\t\tif (\n\t\t\t\t\tpredicate( line, iter.next( 1 ).attributes || {}, i ) ===\n\t\t\t\t\tfalse\n\t\t\t\t) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t\ti += 1;\n\t\t\t\tline = new Delta();\n\t\t\t}\n\t\t}\n\t\tif ( line.length() > 0 ) {\n\t\t\tpredicate( line, {}, i );\n\t\t}\n\t}\n\n\tinvert( base: Delta ): Delta {\n\t\tconst inverted = new Delta();\n\t\tthis.reduce( ( baseIndex, op ) => {\n\t\t\tif ( op.insert ) {\n\t\t\t\tinverted.delete( Op.length( op ) );\n\t\t\t} else if (\n\t\t\t\ttypeof op.retain === 'number' &&\n\t\t\t\t( op.attributes === null || op.attributes === undefined )\n\t\t\t) {\n\t\t\t\tinverted.retain( op.retain );\n\t\t\t\treturn baseIndex + op.retain;\n\t\t\t} else if ( op.delete || typeof op.retain === 'number' ) {\n\t\t\t\tconst length = ( op.delete || op.retain ) as number;\n\t\t\t\tconst slice = base.slice( baseIndex, baseIndex + length );\n\t\t\t\tslice.forEach( ( baseOp ) => {\n\t\t\t\t\tif ( op.delete ) {\n\t\t\t\t\t\tinverted.push( baseOp );\n\t\t\t\t\t} else if ( op.retain && op.attributes ) {\n\t\t\t\t\t\tinverted.retain(\n\t\t\t\t\t\t\tOp.length( baseOp ),\n\t\t\t\t\t\t\tAttributeMap.invert(\n\t\t\t\t\t\t\t\top.attributes,\n\t\t\t\t\t\t\t\tbaseOp.attributes\n\t\t\t\t\t\t\t)\n\t\t\t\t\t\t);\n\t\t\t\t\t}\n\t\t\t\t} );\n\t\t\t\treturn baseIndex + length;\n\t\t\t} else if ( typeof op.retain === 'object' && op.retain !== null ) {\n\t\t\t\tconst slice = base.slice( baseIndex, baseIndex + 1 );\n\t\t\t\tconst baseOp = new OpIterator( slice.ops ).next();\n\t\t\t\tconst [ embedType, opData, baseOpData ] = getEmbedTypeAndData(\n\t\t\t\t\top.retain,\n\t\t\t\t\tbaseOp.insert\n\t\t\t\t);\n\t\t\t\tconst handler = Delta.getHandler( embedType );\n\t\t\t\tinverted.retain(\n\t\t\t\t\t{ [ embedType ]: handler.invert( opData, baseOpData ) },\n\t\t\t\t\tAttributeMap.invert( op.attributes, baseOp.attributes )\n\t\t\t\t);\n\t\t\t\treturn baseIndex + 1;\n\t\t\t}\n\t\t\treturn baseIndex;\n\t\t}, 0 );\n\t\treturn inverted.chop();\n\t}\n\n\ttransform( index: number, priority?: boolean ): number;\n\ttransform( other: Delta, priority?: boolean ): Delta;\n\ttransform( arg: number | Delta, priority = false ): typeof arg {\n\t\tpriority = !! priority;\n\t\tif ( typeof arg === 'number' ) {\n\t\t\treturn this.transformPosition( arg, priority );\n\t\t}\n\t\tconst other: Delta = arg;\n\t\tconst thisIter = new OpIterator( this.ops );\n\t\tconst otherIter = new OpIterator( other.ops );\n\t\tconst delta = new Delta();\n\t\twhile ( thisIter.hasNext() || otherIter.hasNext() ) {\n\t\t\tif (\n\t\t\t\tthisIter.peekType() === 'insert' &&\n\t\t\t\t( priority || otherIter.peekType() !== 'insert' )\n\t\t\t) {\n\t\t\t\tdelta.retain( Op.length( thisIter.next() ) );\n\t\t\t} else if ( otherIter.peekType() === 'insert' ) {\n\t\t\t\tdelta.push( otherIter.next() );\n\t\t\t} else {\n\t\t\t\tconst length = Math.min(\n\t\t\t\t\tthisIter.peekLength(),\n\t\t\t\t\totherIter.peekLength()\n\t\t\t\t);\n\t\t\t\tconst thisOp = thisIter.next( length );\n\t\t\t\tconst otherOp = otherIter.next( length );\n\t\t\t\tif ( thisOp.delete ) {\n\t\t\t\t\t// Our delete either makes their delete redundant or removes their retain\n\t\t\t\t\tcontinue;\n\t\t\t\t} else if ( otherOp.delete ) {\n\t\t\t\t\tdelta.push( otherOp );\n\t\t\t\t} else {\n\t\t\t\t\tconst thisData = thisOp.retain;\n\t\t\t\t\tconst otherData = otherOp.retain;\n\t\t\t\t\tlet transformedData: Op[ 'retain' ] =\n\t\t\t\t\t\ttypeof otherData === 'object' && otherData !== null\n\t\t\t\t\t\t\t? otherData\n\t\t\t\t\t\t\t: length;\n\t\t\t\t\tif (\n\t\t\t\t\t\ttypeof thisData === 'object' &&\n\t\t\t\t\t\tthisData !== null &&\n\t\t\t\t\t\ttypeof otherData === 'object' &&\n\t\t\t\t\t\totherData !== null\n\t\t\t\t\t) {\n\t\t\t\t\t\tconst embedType = Object.keys( thisData )[ 0 ];\n\t\t\t\t\t\tif ( embedType === Object.keys( otherData )[ 0 ] ) {\n\t\t\t\t\t\t\tconst handler = Delta.getHandler( embedType );\n\t\t\t\t\t\t\tif ( handler ) {\n\t\t\t\t\t\t\t\ttransformedData = {\n\t\t\t\t\t\t\t\t\t[ embedType ]: handler.transform(\n\t\t\t\t\t\t\t\t\t\tthisData[ embedType ],\n\t\t\t\t\t\t\t\t\t\totherData[ embedType ],\n\t\t\t\t\t\t\t\t\t\tpriority\n\t\t\t\t\t\t\t\t\t),\n\t\t\t\t\t\t\t\t};\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\n\t\t\t\t\t// We retain either their retain or insert\n\t\t\t\t\tdelta.retain(\n\t\t\t\t\t\ttransformedData,\n\t\t\t\t\t\tAttributeMap.transform(\n\t\t\t\t\t\t\tthisOp.attributes,\n\t\t\t\t\t\t\totherOp.attributes,\n\t\t\t\t\t\t\tpriority\n\t\t\t\t\t\t)\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\treturn delta.chop();\n\t}\n\n\ttransformPosition( index: number, priority = false ): number {\n\t\tpriority = !! priority;\n\t\tconst thisIter = new OpIterator( this.ops );\n\t\tlet offset = 0;\n\t\twhile ( thisIter.hasNext() && offset <= index ) {\n\t\t\tconst length = thisIter.peekLength();\n\t\t\tconst nextType = thisIter.peekType();\n\t\t\tthisIter.next();\n\t\t\tif ( nextType === 'delete' ) {\n\t\t\t\tindex -= Math.min( length, index - offset );\n\t\t\t\tcontinue;\n\t\t\t} else if (\n\t\t\t\tnextType === 'insert' &&\n\t\t\t\t( offset < index || ! priority )\n\t\t\t) {\n\t\t\t\tindex += length;\n\t\t\t}\n\t\t\toffset += length;\n\t\t}\n\t\treturn index;\n\t}\n\n\t/**\n\t * Given a Delta and a cursor position, do a diff and attempt to adjust\n\t * the diff to place insertions or deletions at the cursor position.\n\t *\n\t * @param other             - The other Delta to diff against.\n\t * @param cursorAfterChange - The cursor position index after the change.\n\t * @return A Delta that attempts to place insertions or deletions at the cursor position.\n\t */\n\tdiffWithCursor( other: Delta, cursorAfterChange: number | null ): Delta {\n\t\tif ( this.ops === other.ops ) {\n\t\t\treturn new Delta();\n\t\t} else if ( cursorAfterChange === null ) {\n\t\t\t// If no cursor position is provided, do a regular diff.\n\t\t\treturn this.diff( other );\n\t\t}\n\n\t\tconst strings = this.deltasToStrings( other );\n\t\tlet diffs = normalizeChangeCounts(\n\t\t\tdiffChars( strings[ 0 ], strings[ 1 ] )\n\t\t);\n\t\tlet lastDiffPosition = 0;\n\t\tconst adjustedDiffs: Change[] = [];\n\n\t\tfor ( let i = 0; i < diffs.length; i++ ) {\n\t\t\tconst diff = diffs[ i ];\n\n\t\t\tconst segmentStart = lastDiffPosition;\n\t\t\tconst segmentEnd = lastDiffPosition + ( diff.count ?? 0 );\n\t\t\tconst isCursorInSegment =\n\t\t\t\tcursorAfterChange > segmentStart &&\n\t\t\t\tcursorAfterChange <= segmentEnd;\n\n\t\t\tconst isUnchangedSegment = ! diff.added && ! diff.removed;\n\t\t\tconst isRemovalSegment = diff.removed && ! diff.added;\n\n\t\t\tconst nextDiff = diffs[ i + 1 ];\n\t\t\tconst isNextDiffAnInsert =\n\t\t\t\tnextDiff && nextDiff.added && ! nextDiff.removed;\n\n\t\t\t// Path 1: Look-ahead strategy\n\t\t\t// If the position of the cursor is in an \"unchanged\" segment, but there's an insertion\n\t\t\t// right after this section, then the insertion has likely been placed in\n\t\t\t// the incorrect spot, and we can move the insertion to the position of the cursor.\n\t\t\tif (\n\t\t\t\tisUnchangedSegment &&\n\t\t\t\tisCursorInSegment &&\n\t\t\t\tisNextDiffAnInsert\n\t\t\t) {\n\t\t\t\tconst movedSegments = this.tryMoveInsertionToCursor(\n\t\t\t\t\tdiff,\n\t\t\t\t\tnextDiff,\n\t\t\t\t\tcursorAfterChange,\n\t\t\t\t\tsegmentStart\n\t\t\t\t);\n\n\t\t\t\tif ( movedSegments ) {\n\t\t\t\t\tadjustedDiffs.push( ...movedSegments );\n\t\t\t\t\t// Skip the next diff since we've already consumed it\n\t\t\t\t\ti++;\n\t\t\t\t\tlastDiffPosition = segmentEnd;\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Path 2: Look-back strategy\n\t\t\t// Handle removals by checking if cursor was in the previous unchanged segment\n\t\t\tif ( isRemovalSegment ) {\n\t\t\t\tconst movedSegments = this.tryMoveDeletionToCursor(\n\t\t\t\t\tdiff,\n\t\t\t\t\tadjustedDiffs,\n\t\t\t\t\tcursorAfterChange,\n\t\t\t\t\tlastDiffPosition\n\t\t\t\t);\n\n\t\t\t\tif ( movedSegments ) {\n\t\t\t\t\t// Remove the previous unchanged segment from adjustedDiffs\n\t\t\t\t\tadjustedDiffs.pop();\n\t\t\t\t\tadjustedDiffs.push( ...movedSegments );\n\t\t\t\t\tlastDiffPosition += diff.count ?? 0;\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Path 3: Do nothing - add diff as-is\n\t\t\tadjustedDiffs.push( diff );\n\t\t\tif ( ! diff.added ) {\n\t\t\t\tlastDiffPosition += diff.count ?? 0;\n\t\t\t}\n\t\t}\n\n\t\tdiffs = adjustedDiffs;\n\n\t\tconst thisIter = new OpIterator( this.ops );\n\t\tconst otherIter = new OpIterator( other.ops );\n\t\tconst retDelta = this.convertChangesToDelta(\n\t\t\tdiffs,\n\t\t\tthisIter,\n\t\t\totherIter\n\t\t);\n\n\t\treturn retDelta.chop();\n\t}\n\n\t/**\n\t * Try to move an insertion operation from after an unchanged segment to the cursor position within it.\n\t * This is a \"look-ahead\" strategy.\n\t *\n\t * @param diff              - The current unchanged diff segment.\n\t * @param nextDiff          - The next diff segment (expected to be an insertion).\n\t * @param cursorAfterChange - The cursor position after the change.\n\t * @param segmentStart      - The start position of the current segment.\n\t * @return An array of adjusted diff segments if the insertion was successfully moved, null otherwise.\n\t */\n\tprivate tryMoveInsertionToCursor(\n\t\tdiff: Change,\n\t\tnextDiff: Change,\n\t\tcursorAfterChange: number,\n\t\tsegmentStart: number\n\t): Change[] | null {\n\t\tconst nextDiffInsert = nextDiff.value;\n\t\tconst insertLength = nextDiffInsert.length;\n\t\tconst insertOffset = cursorAfterChange - segmentStart - insertLength;\n\n\t\t// Verify that the inserted text matches the text at the cursor position\n\t\tconst textAtCursor = diff.value.substring(\n\t\t\tinsertOffset,\n\t\t\tinsertOffset + nextDiffInsert.length\n\t\t);\n\t\tconst isInsertMoveable = textAtCursor === nextDiffInsert;\n\n\t\t// The insert text matches what's at the cursor position,\n\t\t// so we can safely move the insertion to the cursor position.\n\t\tif ( ! isInsertMoveable ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// Split the current segment at the cursor\n\t\tconst beforeCursor = diff.value.substring( 0, insertOffset );\n\t\tconst afterCursor = diff.value.substring( insertOffset );\n\n\t\tconst result: Change[] = [];\n\n\t\t// Add before cursor part (if not empty)\n\t\tif ( beforeCursor.length > 0 ) {\n\t\t\tresult.push( {\n\t\t\t\tvalue: beforeCursor,\n\t\t\t\tcount: beforeCursor.length,\n\t\t\t\tadded: false,\n\t\t\t\tremoved: false,\n\t\t\t} );\n\t\t}\n\n\t\t// Add the insertion in the middle\n\t\tresult.push( nextDiff );\n\n\t\t// Add after cursor part (if not empty)\n\t\tif ( afterCursor.length > 0 ) {\n\t\t\tresult.push( {\n\t\t\t\tvalue: afterCursor,\n\t\t\t\tcount: afterCursor.length,\n\t\t\t\tadded: false,\n\t\t\t\tremoved: false,\n\t\t\t} );\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Try to move a deletion operation to the cursor position by looking back at the previous unchanged segment.\n\t * This is a \"look-back\" strategy.\n\t *\n\t * @param diff              - The current deletion diff segment.\n\t * @param adjustedDiffs     - The array of previously processed diff segments.\n\t * @param cursorAfterChange - The cursor position after the change.\n\t * @param lastDiffPosition  - The position in the document up to (but not including) the current diff.\n\t * @return An array of adjusted diff segments if the deletion was successfully moved, null otherwise.\n\t */\n\tprivate tryMoveDeletionToCursor(\n\t\tdiff: Change,\n\t\tadjustedDiffs: Change[],\n\t\tcursorAfterChange: number,\n\t\tlastDiffPosition: number\n\t): Change[] | null {\n\t\t// Check if there's a preceding unchanged segment where cursor falls\n\t\t// and the deleted characters match characters in that segment\n\t\tconst prevDiff = adjustedDiffs[ adjustedDiffs.length - 1 ];\n\n\t\tif ( ! prevDiff || prevDiff.added || prevDiff.removed ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst prevSegmentStart = lastDiffPosition - ( prevDiff.count ?? 0 );\n\t\tconst prevSegmentEnd = lastDiffPosition;\n\n\t\t// Check if cursor is within or at the end of the previous unchanged segment\n\t\tif (\n\t\t\tcursorAfterChange < prevSegmentStart ||\n\t\t\tcursorAfterChange >= prevSegmentEnd\n\t\t) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// Check if the deleted characters match the text at the cursor position\n\t\tconst deletedChars = diff.value;\n\t\tconst deleteOffset = cursorAfterChange - prevSegmentStart;\n\t\tconst textAtCursor = prevDiff.value.substring(\n\t\t\tdeleteOffset,\n\t\t\tdeleteOffset + deletedChars.length\n\t\t);\n\t\tconst canBePlacedHere = textAtCursor === deletedChars;\n\n\t\tif ( ! canBePlacedHere ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// Split the unchanged segment at the cursor and place deletion there\n\t\tconst beforeCursor = prevDiff.value.substring( 0, deleteOffset );\n\t\tconst atAndAfterCursor = prevDiff.value.substring( deleteOffset );\n\n\t\t// The deletion should consume characters starting at cursor\n\t\tconst deletionLength = diff.count ?? 0;\n\t\tconst afterDeletion = atAndAfterCursor.substring( deletionLength );\n\n\t\tconst result: Change[] = [];\n\n\t\t// Add before cursor part (if not empty)\n\t\tif ( beforeCursor.length > 0 ) {\n\t\t\tresult.push( {\n\t\t\t\tvalue: beforeCursor,\n\t\t\t\tcount: beforeCursor.length,\n\t\t\t\tadded: false,\n\t\t\t\tremoved: false,\n\t\t\t} );\n\t\t}\n\n\t\t// Add the deletion\n\t\tresult.push( diff );\n\n\t\t// Add after deletion part (if not empty)\n\t\tif ( afterDeletion.length > 0 ) {\n\t\t\tresult.push( {\n\t\t\t\tvalue: afterDeletion,\n\t\t\t\tcount: afterDeletion.length,\n\t\t\t\tadded: false,\n\t\t\t\tremoved: false,\n\t\t\t} );\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Convert two Deltas to string representations for diffing.\n\t *\n\t * @param other - The other Delta to convert.\n\t * @return A tuple of [thisString, otherString].\n\t */\n\tprivate deltasToStrings( other: Delta ): [ string, string ] {\n\t\treturn [ this, other ].map( ( delta ) => {\n\t\t\treturn delta\n\t\t\t\t.map( ( op ) => {\n\t\t\t\t\tif ( op.insert !== null || op.insert !== undefined ) {\n\t\t\t\t\t\treturn typeof op.insert === 'string'\n\t\t\t\t\t\t\t? op.insert\n\t\t\t\t\t\t\t: NULL_CHARACTER;\n\t\t\t\t\t}\n\t\t\t\t\tconst prep = delta === other ? 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   "names": []
 }

build-module/utils.mjs

@@ -16,6 +16,7 @@ // packages/sync/src/utils.ts
   );
-  const ydoc = new Y.Doc({ meta: metaMap });
+  return new Y.Doc({ meta: metaMap });
+}
+function initializeYjsDoc(ydoc) {
   const stateMap = ydoc.getMap(CRDT_STATE_MAP_KEY);
   stateMap.set(VERSION_KEY, CRDT_DOC_VERSION);
-  return ydoc;
 }
@@ -55,2 +56,3 @@ function markEntityAsSaved(ydoc) {
   deserializeCrdtDoc,
+  initializeYjsDoc,
   markEntityAsSaved,
@@ -57,0 +59,0 @@ serializeCrdtDoc

build-module/utils.mjs.map

 {
   "version": 3,
   "sources": ["../src/utils.ts"],
-  "sourcesContent": ["/**\n * External dependencies\n */\nimport * as Y from 'yjs';\nimport * as buffer from 'lib0/buffer';\n\n/**\n * Internal dependencies\n */\nimport {\n\tCRDT_DOC_META_PERSISTENCE_KEY,\n\tCRDT_DOC_VERSION,\n\tCRDT_STATE_MAP_KEY,\n\tCRDT_STATE_MAP_SAVED_AT_KEY as SAVED_AT_KEY,\n\tCRDT_STATE_MAP_SAVED_BY_KEY as SAVED_BY_KEY,\n\tCRDT_STATE_MAP_VERSION_KEY as VERSION_KEY,\n} from './config';\nimport type { CRDTDoc } from './types';\n\n// An object representation of CRDT document metadata.\ntype DocumentMeta = Record< string, DocumentMetaValue >;\ntype DocumentMetaValue = boolean | number | string;\n\nexport function createYjsDoc( documentMeta: DocumentMeta = {} ): Y.Doc {\n\t// Convert the object representation of CRDT document metadata to a map.\n\t// Document metadata is passed to the Y.Doc constructor and stored in its\n\t// `meta` property. It is not synced to peers or persisted with the document.\n\t// It is just a place to store transient information about this doc instance.\n\tconst metaMap = new Map< string, DocumentMetaValue >(\n\t\tObject.entries( documentMeta )\n\t);\n\n\tconst ydoc = new Y.Doc( { meta: metaMap } );\n\tconst stateMap = ydoc.getMap( CRDT_STATE_MAP_KEY );\n\n\tstateMap.set( VERSION_KEY, CRDT_DOC_VERSION );\n\n\treturn ydoc;\n}\n\n/**\n * Record that the entity was saved (persisted to the database) in the CRDT\n * document record metadata.\n *\n * @param {CRDTDoc} ydoc CRDT document.\n */\nexport function markEntityAsSaved( ydoc: CRDTDoc ): void {\n\tconst recordMeta = ydoc.getMap( CRDT_STATE_MAP_KEY );\n\trecordMeta.set( SAVED_AT_KEY, Date.now() );\n\trecordMeta.set( SAVED_BY_KEY, ydoc.clientID );\n}\n\nfunction pseudoRandomID(): number {\n\treturn Math.floor( Math.random() * 1000000000 );\n}\n\nexport function serializeCrdtDoc( crdtDoc: CRDTDoc ): string {\n\treturn JSON.stringify( {\n\t\tdocument: buffer.toBase64( Y.encodeStateAsUpdateV2( crdtDoc ) ),\n\t\tupdateId: pseudoRandomID(), // helps with debugging\n\t} );\n}\n\nexport function deserializeCrdtDoc(\n\tserializedCrdtDoc: string\n): CRDTDoc | null {\n\ttry {\n\t\tconst { document } = JSON.parse( serializedCrdtDoc );\n\n\t\t// Mark this document as from persistence.\n\t\tconst docMeta: DocumentMeta = {\n\t\t\t[ CRDT_DOC_META_PERSISTENCE_KEY ]: true,\n\t\t};\n\n\t\t// Apply the document as an update against a new (temporary) Y.Doc.\n\t\tconst ydoc = createYjsDoc( docMeta );\n\t\tconst yupdate = buffer.fromBase64( document );\n\t\tY.applyUpdateV2( ydoc, yupdate );\n\n\t\t// Overwrite the client ID (which is from a previous session) with a random\n\t\t// client ID. Deserialized documents should not be used directly. Instead,\n\t\t// their state should be applied to another in-use document.\n\t\tydoc.clientID = pseudoRandomID();\n\n\t\treturn ydoc;\n\t} catch ( e ) {\n\t\treturn null;\n\t}\n}\n"],
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build-types/manager.d.ts.map

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build-types/private-apis.d.ts.map

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build-types/provid...-polling/http-polling-provider.d.ts.map

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build-types/providers/http-polling/polling-manager.d.ts

@@ -13,2 +13,3 @@ /**
     registerRoom: (options: RegisterRoomOptions) => void;
+    retryNow: () => void;
     unregisterRoom: (room: string) => void;
@@ -15,0 +16,0 @@ }

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build-types/types.d.ts

@@ -53,11 +53,18 @@ /**
 /**
- * Current connection status of a sync provider, including status and optional error information.
+ * Current connection status of a sync provider.
  */
-export interface ConnectionStatus {
-    status: 'connected' | 'connecting' | 'disconnected';
-    /**
-     * Optional error information when status is 'disconnected'.
-     */
+export interface ConnectionStatusConnected {
+    status: 'connected';
+}
+export interface ConnectionStatusConnecting {
+    status: 'connecting';
+}
+export interface ConnectionStatusDisconnected {
+    status: 'disconnected';
+    /** Optional error information. */
     error?: ConnectionError;
+    /** Milliseconds until the next automatic retry attempt. */
+    retryInMs?: number;
 }
+export type ConnectionStatus = ConnectionStatusConnected | ConnectionStatusConnecting | ConnectionStatusDisconnected;
 export type OnStatusChangeCallback = (status: ConnectionStatus | null) => void;
@@ -100,3 +107,3 @@ /**
 export interface SyncManager {
-    createPersistedCRDTDoc: (objectType: ObjectType, objectId: ObjectID) => string | null;
+    createPersistedCRDTDoc: (objectType: ObjectType, objectId: ObjectID) => Promise<string | null>;
     getAwareness: <State extends Awareness>(objectType: ObjectType, objectId: ObjectID) => State | undefined;
@@ -103,0 +110,0 @@ load: (syncConfig: SyncConfig, objectType: ObjectType, objectId: ObjectID, record: ObjectData, handlers: RecordHandlers) => Promise<void>;

build-types/types.d.ts.map

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build-types/utils.d.ts

@@ -1,10 +0,18 @@
-/**
- * External dependencies
- */
-import * as Y from 'yjs';
 import type { CRDTDoc } from './types';
 type DocumentMeta = Record<string, DocumentMetaValue>;
 type DocumentMetaValue = boolean | number | string;
-export declare function createYjsDoc(documentMeta?: DocumentMeta): Y.Doc;
 /**
+ * Creates a new Y.Doc instance with the given document metadata.
+ *
+ * @param {DocumentMeta} documentMeta Optional metadata to associate with the
+ *                                    document. Metadata is not persisted.
+ */
+export declare function createYjsDoc(documentMeta?: DocumentMeta): CRDTDoc;
+/**
+ * Initializes a Y.Doc instance with the necessary CRDT state for our use case.
+ *
+ * @param {Y.Doc} ydoc Y.Doc instance to initialize.
+ */
+export declare function initializeYjsDoc(ydoc: CRDTDoc): void;
+/**
  * Record that the entity was saved (persisted to the database) in the CRDT
@@ -11,0 +19,0 @@ * document record metadata.

build-types/utils.d.ts.map

@@ -1,1 +0,1 @@
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+{"version":3,"file":"utils.d.ts","sourceRoot":"","sources":["../src/utils.ts"],"names":[],"mappings":"AAiBA,OAAO,KAAK,EAAE,OAAO,EAAE,MAAM,SAAS,CAAC;AAGvC,KAAK,YAAY,GAAG,MAAM,CAAE,MAAM,EAAE,iBAAiB,CAAE,CAAC;AACxD,KAAK,iBAAiB,GAAG,OAAO,GAAG,MAAM,GAAG,MAAM,CAAC;AAEnD;;;;;GAKG;AACH,wBAAgB,YAAY,CAAE,YAAY,GAAE,YAAiB,GAAI,OAAO,CAYvE;AAED;;;;GAIG;AACH,wBAAgB,gBAAgB,CAAE,IAAI,EAAE,OAAO,GAAI,IAAI,CAGtD;AAED;;;;;GAKG;AACH,wBAAgB,iBAAiB,CAAE,IAAI,EAAE,OAAO,GAAI,IAAI,CAIvD;AAMD,wBAAgB,gBAAgB,CAAE,OAAO,EAAE,OAAO,GAAI,MAAM,CAK3D;AAED,wBAAgB,kBAAkB,CACjC,iBAAiB,EAAE,MAAM,GACvB,OAAO,GAAG,IAAI,CAuBhB"}

build/manager.cjs

@@ -150,2 +150,3 @@ "use strict";
     stateMap.observe(onStateMapUpdate);
+    (0, import_utils.initializeYjsDoc)(ydoc);
     internal.applyPersistedCrdtDoc(objectType, objectId, record);
@@ -215,2 +216,3 @@ }
     stateMap.observe(onStateMapUpdate);
+    (0, import_utils.initializeYjsDoc)(ydoc);
   }
@@ -327,3 +329,3 @@ function unloadEntity(objectType, objectId) {
   }
-  function createPersistedCRDTDoc(objectType, objectId) {
+  async function createPersistedCRDTDoc(objectType, objectId) {
     const entityId = getEntityId(objectType, objectId);
@@ -334,2 +336,3 @@ const entityState = entityStates.get(entityId);
     }
+    await new Promise((resolve) => setTimeout(resolve, 0));
     return (0, import_utils.serializeCrdtDoc)(entityState.ydoc);
@@ -336,0 +339,0 @@ }

build/manager.cjs.map

 {
   "version": 3,
   "sources": ["../src/manager.ts"],
-  "sourcesContent": ["/**\n * External dependencies\n */\nimport * as Y from 'yjs';\nimport type { Awareness } from 'y-protocols/awareness';\n\n/**\n * Internal dependencies\n */\nimport {\n\tCRDT_RECORD_MAP_KEY,\n\tCRDT_STATE_MAP_KEY,\n\tCRDT_STATE_MAP_SAVED_AT_KEY as SAVED_AT_KEY,\n\tLOCAL_SYNC_MANAGER_ORIGIN,\n} from './config';\nimport {\n\tlogPerformanceTiming,\n\tpassThru,\n\tyieldToEventLoop,\n} from './performance';\nimport { getProviderCreators } from './providers';\nimport type {\n\tCollectionHandlers,\n\tCRDTDoc,\n\tEntityID,\n\tObjectID,\n\tObjectData,\n\tObjectType,\n\tProviderCreator,\n\tRecordHandlers,\n\tSyncConfig,\n\tSyncManager,\n\tSyncManagerUpdateOptions,\n\tSyncUndoManager,\n} from './types';\nimport { createUndoManager } from './undo-manager';\nimport {\n\tcreateYjsDoc,\n\tdeserializeCrdtDoc,\n\tmarkEntityAsSaved,\n\tserializeCrdtDoc,\n} from './utils';\n\ninterface CollectionState {\n\tawareness?: Awareness;\n\thandlers: CollectionHandlers;\n\tsyncConfig: SyncConfig;\n\tunload: () => void;\n\tydoc: CRDTDoc;\n}\n\ninterface EntityState {\n\tawareness?: Awareness;\n\thandlers: RecordHandlers;\n\tobjectId: ObjectID;\n\tobjectType: ObjectType;\n\tsyncConfig: SyncConfig;\n\tunload: () => void;\n\tydoc: CRDTDoc;\n}\n\n/**\n * Get the entity ID for the given object type and object ID.\n *\n * @param {ObjectType}    objectType Object type.\n * @param {ObjectID|null} objectId   Object ID.\n */\nfunction getEntityId(\n\tobjectType: ObjectType,\n\tobjectId: ObjectID | null\n): EntityID {\n\treturn `${ objectType }_${ objectId }`;\n}\n\n/**\n * The sync manager orchestrates the lifecycle of syncing entity records. It\n * creates Yjs documents, connects to providers, creates awareness instances,\n * and coordinates with the `core-data` store.\n *\n * @param debug Whether to enable performance and debug logging.\n */\nexport function createSyncManager( debug = false ): SyncManager {\n\tconst debugWrap = debug ? logPerformanceTiming : passThru;\n\tconst collectionStates: Map< ObjectType, CollectionState > = new Map();\n\tconst entityStates: Map< EntityID, EntityState > = new Map();\n\n\t/**\n\t * A \"sync-aware\" undo manager for all synced entities. It is lazily created\n\t * when the first entity is loaded.\n\t *\n\t * IMPORTANT: In Gutenberg, the undo manager is effectively global and manages\n\t * undo/redo state for all entities. If the default WPUndoManager is used,\n\t * changes to entities are recorded in the `editEntityRecord` action:\n\t *\n\t * https://github.com/WordPress/gutenberg/blob/b63451e26e3c91b6bb291a2f9994722e3850417e/packages/core-data/src/actions.js#L428-L442\n\t *\n\t * In contrast, the `SyncUndoManager` only manages undo/redo for entities that\n\t * **are being synced by this sync manager**. The `addRecord` method is still\n\t * called in the code linked above, but it is a no-op. Yjs automatically tracks\n\t * changes to entities via the associated CRDT doc:\n\t *\n\t * https://github.com/WordPress/gutenberg/blob/b63451e26e3c91b6bb291a2f9994722e3850417e/packages/sync/src/undo-manager.ts#L42-L48\n\t *\n\t * This means that if at least one entity is being synced, then undo/redo\n\t * operations will be **restricted to synced entities only.**\n\t *\n\t * We could improve the `SyncUndoManager` to also track non-synced entities by\n\t * delegating to a secondary `WPUndoManager`, but this would add complexity\n\t * since we would need to maintain two separate undo/redo stacks and ensure\n\t * that they retain ordering and integrity.\n\t *\n\t * However, we also anticipate that most entities being edited in Gutenberg\n\t * will be synced entities (e.g. posts, pages, templates, template parts,\n\t * etc.), so this limitation may be temporary.\n\t */\n\tlet undoManager: SyncUndoManager | undefined;\n\n\t/**\n\t * Log debug messages if debugging is enabled.\n\t *\n\t * @param component The component or context related to the log message\n\t * @param message   The debug message\n\t * @param entityId  The entity ID related to the log message\n\t * @param context   Additional debug context\n\t */\n\tfunction log(\n\t\tcomponent: string,\n\t\tmessage: string,\n\t\tentityId: string,\n\t\tcontext: object = {}\n\t): void {\n\t\tif ( ! debug ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// eslint-disable-next-line no-console\n\t\tconsole.log( `[SyncManager][${ component }]: ${ message }`, {\n\t\t\t...context,\n\t\t\tentityId,\n\t\t} );\n\t}\n\n\t/**\n\t * Load an entity for syncing and manage its lifecycle.\n\t *\n\t * @param {SyncConfig}     syncConfig Sync configuration for the object type.\n\t * @param {ObjectType}     objectType Object type.\n\t * @param {ObjectID}       objectId   Object ID.\n\t * @param {ObjectData}     record     Entity record representing this object type.\n\t * @param {RecordHandlers} handlers   Handlers for updating and fetching the record.\n\t */\n\tasync function loadEntity(\n\t\tsyncConfig: SyncConfig,\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID,\n\t\trecord: ObjectData,\n\t\thandlers: RecordHandlers\n\t): Promise< void > {\n\t\tconst providerCreators = getProviderCreators();\n\t\tconst entityId = getEntityId( objectType, objectId );\n\n\t\tif ( 0 === providerCreators.length ) {\n\t\t\tlog( 'loadEntity', 'no providers, skipping', entityId );\n\t\t\treturn; // No provider creators, so syncing is effectively disabled.\n\t\t}\n\n\t\tif ( entityStates.has( entityId ) ) {\n\t\t\tlog( 'loadEntity', 'already loaded', entityId );\n\t\t\treturn; // Already bootstrapped.\n\t\t}\n\n\t\tlog( 'loadEntity', 'loading', entityId );\n\n\t\thandlers = {\n\t\t\taddUndoMeta: debugWrap( handlers.addUndoMeta ),\n\t\t\teditRecord: debugWrap( handlers.editRecord ),\n\t\t\tgetEditedRecord: debugWrap( handlers.getEditedRecord ),\n\t\t\tonStatusChange: debugWrap( handlers.onStatusChange ),\n\t\t\trefetchRecord: debugWrap( handlers.refetchRecord ),\n\t\t\trestoreUndoMeta: debugWrap( handlers.restoreUndoMeta ),\n\t\t\tsaveRecord: debugWrap( handlers.saveRecord ),\n\t\t};\n\n\t\tconst ydoc = createYjsDoc( { objectType } );\n\t\tconst recordMap = ydoc.getMap( CRDT_RECORD_MAP_KEY );\n\t\tconst stateMap = ydoc.getMap( CRDT_STATE_MAP_KEY );\n\t\tconst now = Date.now();\n\n\t\t// Clean up providers and in-memory state when the entity is unloaded.\n\t\tconst unload = (): void => {\n\t\t\tlog( 'loadEntity', 'unloading', entityId );\n\t\t\tproviderResults.forEach( ( result ) => result.destroy() );\n\t\t\thandlers.onStatusChange( null );\n\t\t\trecordMap.unobserveDeep( onRecordUpdate );\n\t\t\tstateMap.unobserve( onStateMapUpdate );\n\t\t\tydoc.destroy();\n\t\t\tentityStates.delete( entityId );\n\t\t};\n\n\t\t// If the sync config supports awareness, create it.\n\t\tconst awareness = syncConfig.createAwareness?.( ydoc, objectId );\n\n\t\t// When the CRDT document is updated by an UndoManager or a connection (not\n\t\t// a local origin), update the local store.\n\t\tconst onRecordUpdate = (\n\t\t\t_events: Y.YEvent< any >[],\n\t\t\ttransaction: Y.Transaction\n\t\t): void => {\n\t\t\tif (\n\t\t\t\ttransaction.local &&\n\t\t\t\t! ( transaction.origin instanceof Y.UndoManager )\n\t\t\t) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tvoid internal.updateEntityRecord( objectType, objectId );\n\t\t};\n\n\t\tconst onStateMapUpdate = (\n\t\t\tevent: Y.YMapEvent< unknown >,\n\t\t\ttransaction: Y.Transaction\n\t\t) => {\n\t\t\tif ( transaction.local ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tevent.keysChanged.forEach( ( key ) => {\n\t\t\t\tswitch ( key ) {\n\t\t\t\t\tcase SAVED_AT_KEY:\n\t\t\t\t\t\tconst newValue = stateMap.get( SAVED_AT_KEY );\n\t\t\t\t\t\tif ( 'number' === typeof newValue && newValue > now ) {\n\t\t\t\t\t\t\t// Another peer has saved the record. Refetch it so that we have\n\t\t\t\t\t\t\t// a correct understanding of our own unsaved edits.\n\t\t\t\t\t\t\tlog( 'loadEntity', 'refetching record', entityId );\n\t\t\t\t\t\t\tvoid handlers.refetchRecord().catch( () => {} );\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t} );\n\t\t};\n\n\t\t// Lazily create the undo manager when the first entity is loaded.\n\t\tif ( ! undoManager ) {\n\t\t\tundoManager = createUndoManager();\n\t\t}\n\n\t\tconst { addUndoMeta, restoreUndoMeta } = handlers;\n\t\tundoManager.addToScope( recordMap, {\n\t\t\taddUndoMeta,\n\t\t\trestoreUndoMeta,\n\t\t} );\n\n\t\tconst entityState: EntityState = {\n\t\t\tawareness,\n\t\t\thandlers,\n\t\t\tobjectId,\n\t\t\tobjectType,\n\t\t\tsyncConfig,\n\t\t\tunload,\n\t\t\tydoc,\n\t\t};\n\n\t\tentityStates.set( entityId, entityState );\n\n\t\t// Create providers for the given entity and its Yjs document.\n\t\tlog( 'loadEntity', 'connecting', entityId );\n\t\tconst providerResults = await Promise.all(\n\t\t\tproviderCreators.map( async ( create ) => {\n\t\t\t\tconst provider = await create( {\n\t\t\t\t\tobjectType,\n\t\t\t\t\tobjectId,\n\t\t\t\t\tydoc,\n\t\t\t\t\tawareness,\n\t\t\t\t} );\n\n\t\t\t\t// Attach status listener after provider creation.\n\t\t\t\tprovider.on( 'status', handlers.onStatusChange );\n\n\t\t\t\treturn provider;\n\t\t\t} )\n\t\t);\n\n\t\t// Attach observers.\n\t\trecordMap.observeDeep( onRecordUpdate );\n\t\tstateMap.observe( onStateMapUpdate );\n\n\t\t// Get and apply the persisted CRDT document, if it exists.\n\t\tinternal.applyPersistedCrdtDoc( objectType, objectId, record );\n\t}\n\n\t/**\n\t * Load a collection for syncing and manage its lifecycle.\n\t *\n\t * @param {SyncConfig}         syncConfig Sync configuration for the object type.\n\t * @param {ObjectType}         objectType Object type.\n\t * @param {CollectionHandlers} handlers   Handlers for updating the collection.\n\t */\n\tasync function loadCollection(\n\t\tsyncConfig: SyncConfig,\n\t\tobjectType: ObjectType,\n\t\thandlers: CollectionHandlers\n\t): Promise< void > {\n\t\tconst providerCreators: ProviderCreator[] = getProviderCreators();\n\t\tconst entityId = getEntityId( objectType, null );\n\n\t\tif ( 0 === providerCreators.length ) {\n\t\t\tlog( 'loadCollection', 'no providers, skipping', entityId );\n\t\t\treturn; // No provider creators, so syncing is effectively disabled.\n\t\t}\n\n\t\tif ( collectionStates.has( objectType ) ) {\n\t\t\tlog( 'loadCollection', 'already loaded', entityId );\n\t\t\treturn; // Already loaded.\n\t\t}\n\n\t\tlog( 'loadCollection', 'loading', entityId );\n\n\t\tconst ydoc = createYjsDoc( { collection: true, objectType } );\n\t\tconst stateMap = ydoc.getMap( CRDT_STATE_MAP_KEY );\n\t\tconst now = Date.now();\n\n\t\t// Clean up providers and in-memory state when the entity is unloaded.\n\t\tconst unload = (): void => {\n\t\t\tlog( 'loadCollection', 'unloading', entityId );\n\t\t\tproviderResults.forEach( ( result ) => result.destroy() );\n\t\t\thandlers.onStatusChange( null );\n\t\t\tstateMap.unobserve( onStateMapUpdate );\n\t\t\tydoc.destroy();\n\t\t\tcollectionStates.delete( objectType );\n\t\t};\n\n\t\tconst onStateMapUpdate = (\n\t\t\tevent: Y.YMapEvent< unknown >,\n\t\t\ttransaction: Y.Transaction\n\t\t) => {\n\t\t\tif ( transaction.local ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tevent.keysChanged.forEach( ( key ) => {\n\t\t\t\tswitch ( key ) {\n\t\t\t\t\tcase SAVED_AT_KEY:\n\t\t\t\t\t\tconst newValue = stateMap.get( SAVED_AT_KEY );\n\t\t\t\t\t\tif ( 'number' === typeof newValue && newValue > now ) {\n\t\t\t\t\t\t\t// Another peer has mutated the collection. Refetch it so that we\n\t\t\t\t\t\t\t// obtain the updated records.\n\t\t\t\t\t\t\tvoid handlers.refetchRecords().catch( () => {} );\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t} );\n\t\t};\n\n\t\t// If the sync config supports awareness, create it.\n\t\tconst awareness = syncConfig.createAwareness?.( ydoc );\n\n\t\tconst collectionState: CollectionState = {\n\t\t\tawareness,\n\t\t\thandlers,\n\t\t\tsyncConfig,\n\t\t\tunload,\n\t\t\tydoc,\n\t\t};\n\n\t\tcollectionStates.set( objectType, collectionState );\n\n\t\t// Create providers for the given entity and its Yjs document.\n\t\tlog( 'loadCollection', 'connecting', entityId );\n\t\tconst providerResults = await Promise.all(\n\t\t\tproviderCreators.map( async ( create ) => {\n\t\t\t\tconst provider = await create( {\n\t\t\t\t\tawareness,\n\t\t\t\t\tobjectType,\n\t\t\t\t\tobjectId: null,\n\t\t\t\t\tydoc,\n\t\t\t\t} );\n\n\t\t\t\t// Attach status listener after provider creation.\n\t\t\t\tprovider.on( 'status', handlers.onStatusChange );\n\n\t\t\t\treturn provider;\n\t\t\t} )\n\t\t);\n\n\t\t// Attach observers.\n\t\tstateMap.observe( onStateMapUpdate );\n\t}\n\n\t/**\n\t * Unload an entity, stop syncing, destroy its in-memory state, and trigger an\n\t * update of the collection.\n\t *\n\t * @param {ObjectType} objectType Object type to discard.\n\t * @param {ObjectID}   objectId   Object ID to discard, or null for collections.\n\t */\n\tfunction unloadEntity( objectType: ObjectType, objectId: ObjectID ): void {\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tlog( 'unloadEntity', 'unloading', entityId );\n\t\tentityStates.get( entityId )?.unload();\n\t\tupdateCRDTDoc( objectType, null, {}, origin, { isSave: true } );\n\t}\n\n\t/**\n\t * Get the awareness instance for the given object type and object ID, if supported.\n\t *\n\t * @template {Awareness} State\n\t * @param {ObjectType} objectType Object type.\n\t * @param {ObjectID}   objectId   Object ID.\n\t * @return {State | undefined} The awareness instance, or undefined if not supported.\n\t */\n\tfunction getAwareness< State extends Awareness >(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID\n\t): State | undefined {\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tconst entityState = entityStates.get( entityId );\n\n\t\tif ( ! entityState || ! entityState.awareness ) {\n\t\t\treturn undefined;\n\t\t}\n\n\t\treturn entityState.awareness as State;\n\t}\n\n\t/**\n\t * Load and inspect the persisted CRDT document. If supported and it exists,\n\t * compare it against the current entity record. If there are differences,\n\t * apply the changes from the entity record.\n\t *\n\t * @param {ObjectType} objectType Object type.\n\t * @param {ObjectID}   objectId   Object ID.\n\t * @param {ObjectData} record     Entity record representing this object type.\n\t */\n\tfunction _applyPersistedCrdtDoc(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID,\n\t\trecord: ObjectData\n\t): void {\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tconst entityState = entityStates.get( entityId );\n\n\t\tif ( ! entityState ) {\n\t\t\tlog( 'applyPersistedCrdtDoc', 'no entity state', entityId );\n\t\t\treturn;\n\t\t}\n\n\t\tconst {\n\t\t\thandlers,\n\t\t\tsyncConfig: {\n\t\t\t\tapplyChangesToCRDTDoc,\n\t\t\t\tgetChangesFromCRDTDoc,\n\t\t\t\tgetPersistedCRDTDoc,\n\t\t\t},\n\t\t\tydoc: targetDoc,\n\t\t} = entityState;\n\n\t\t// Get the persisted CRDT document, if it exists.\n\t\tconst serialized = getPersistedCRDTDoc?.( record );\n\t\tconst tempDoc = serialized ? deserializeCrdtDoc( serialized ) : null;\n\n\t\tif ( ! tempDoc ) {\n\t\t\tlog( 'applyPersistedCrdtDoc', 'no persisted doc', entityId );\n\t\t\t// Apply the current record as changes and trigger a save, which will\n\t\t\t// persist the CRDT document. (The entity should call `createPersistedCRDTDoc`\n\t\t\t// via its pre-persist hook.)\n\t\t\ttargetDoc.transact( () => {\n\t\t\t\tapplyChangesToCRDTDoc( targetDoc, record );\n\t\t\t\thandlers.saveRecord();\n\t\t\t}, LOCAL_SYNC_MANAGER_ORIGIN );\n\t\t\treturn;\n\t\t}\n\n\t\t// Apply the persisted document to the current document as a single update.\n\t\t// This is done even if the persisted document has been invalidated. This\n\t\t// prevents a newly joining peer (or refreshing user) from re-initializing\n\t\t// the CRDT document (the \"initialization problem\").\n\t\t//\n\t\t// IMPORTANT: Do not wrap this in a transaction with the local origin. It\n\t\t// effectively advances the state vector for the current client, which causes\n\t\t// Yjs to think that another client is using this client ID.\n\t\tconst update = Y.encodeStateAsUpdateV2( tempDoc );\n\t\tY.applyUpdateV2( targetDoc, update );\n\n\t\t// Compute the differences between the persisted doc and the current\n\t\t// record. This can happen when:\n\t\t//\n\t\t// 1. The server makes updates on save that mutate the entity. Example: On\n\t\t//    initial save, the server adds the \"Uncategorized\" category to the\n\t\t//    post.\n\t\t// 2. An \"out-of-band\" update occurs. Example: a WP-CLI command or direct\n\t\t//    database update mutates the entity.\n\t\t// 3. Unsaved changes are synced from a peer _before_ this code runs. We\n\t\t//    can't control when (or if) remote changes are synced, so this is a\n\t\t//    race condition.\n\t\tconst invalidations = getChangesFromCRDTDoc( tempDoc, record );\n\t\tconst invalidatedKeys = Object.keys( invalidations );\n\n\t\t// Destroy the temporary document to prevent leaks.\n\t\ttempDoc.destroy();\n\n\t\tif ( 0 === invalidatedKeys.length ) {\n\t\t\tlog( 'applyPersistedCrdtDoc', 'valid persisted doc', entityId );\n\t\t\t// The persisted CRDT document is valid. There are no updates to apply.\n\t\t\treturn;\n\t\t}\n\n\t\tlog( 'applyPersistedCrdtDoc', 'invalidated keys', entityId, {\n\t\t\tinvalidatedKeys,\n\t\t} );\n\n\t\t// Use the invalidated keys to get the updated values from the entity.\n\t\tconst changes = invalidatedKeys.reduce(\n\t\t\t( acc, key ) =>\n\t\t\t\tObject.assign( acc, {\n\t\t\t\t\t[ key ]: record[ key ],\n\t\t\t\t} ),\n\t\t\t{}\n\t\t);\n\n\t\t// Apply the changes and trigger a save, which will persist the CRDT\n\t\t// document. (The entity should call `createPersistedCRDTDoc` via its\n\t\t// pre-persist hook.)\n\t\ttargetDoc.transact( () => {\n\t\t\tapplyChangesToCRDTDoc( targetDoc, changes );\n\t\t\thandlers.saveRecord();\n\t\t}, LOCAL_SYNC_MANAGER_ORIGIN );\n\t}\n\n\t/**\n\t * Update CRDT document with changes from the local store.\n\t *\n\t * @param {ObjectType}               objectType             Object type.\n\t * @param {ObjectID}                 objectId               Object ID.\n\t * @param {Partial< ObjectData >}    changes                Updates to make.\n\t * @param {string}                   origin                 The source of change.\n\t * @param {SyncManagerUpdateOptions} options                Optional flags for the update.\n\t * @param {boolean}                  options.isSave         Whether this update is part of a save operation. Defaults to false.\n\t * @param {boolean}                  options.isNewUndoLevel Whether to create a new undo level for this change. Defaults to false.\n\t */\n\tfunction updateCRDTDoc(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID | null,\n\t\tchanges: Partial< ObjectData >,\n\t\torigin: string,\n\t\toptions: SyncManagerUpdateOptions = {}\n\t): void {\n\t\tconst { isSave = false, isNewUndoLevel = false } = options;\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tconst entityState = entityStates.get( entityId );\n\t\tconst collectionState = collectionStates.get( objectType );\n\n\t\tif ( entityState ) {\n\t\t\tconst { syncConfig, ydoc } = entityState;\n\n\t\t\t// If this is change should create a new undo level, tell the undo\n\t\t\t// manager to stop capturing and create a new undo group.\n\t\t\t// We can't do this in the undo manager itself, because addRecord() is\n\t\t\t// called after the CRDT changes have been applied, and we want to\n\t\t\t// ensure that the undo set is created before the changes are applied.\n\t\t\tif ( isNewUndoLevel && undoManager ) {\n\t\t\t\tundoManager.stopCapturing?.();\n\t\t\t}\n\n\t\t\tydoc.transact( () => {\n\t\t\t\tlog( 'updateCRDTDoc', 'applying changes', entityId, {\n\t\t\t\t\tchangedKeys: Object.keys( changes ),\n\t\t\t\t} );\n\t\t\t\tsyncConfig.applyChangesToCRDTDoc( ydoc, changes );\n\n\t\t\t\tif ( isSave ) {\n\t\t\t\t\tmarkEntityAsSaved( ydoc );\n\t\t\t\t}\n\t\t\t}, origin );\n\t\t}\n\n\t\tif ( collectionState && isSave ) {\n\t\t\tcollectionState.ydoc.transact( () => {\n\t\t\t\tmarkEntityAsSaved( collectionState.ydoc );\n\t\t\t}, origin );\n\t\t}\n\t}\n\n\t/**\n\t * Update the entity record in the local store with changes from the CRDT\n\t * document.\n\t *\n\t * @param {ObjectType} objectType Object type of record to update.\n\t * @param {ObjectID}   objectId   Object ID of record to update.\n\t */\n\tasync function _updateEntityRecord(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID\n\t): Promise< void > {\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tconst entityState = entityStates.get( entityId );\n\n\t\tif ( ! entityState ) {\n\t\t\tlog( 'updateEntityRecord', 'no entity state', entityId );\n\t\t\treturn;\n\t\t}\n\n\t\tconst { handlers, syncConfig, ydoc } = entityState;\n\n\t\t// Determine which synced properties have actually changed by comparing\n\t\t// them against the current edited entity record.\n\t\tconst changes = syncConfig.getChangesFromCRDTDoc(\n\t\t\tydoc,\n\t\t\tawait handlers.getEditedRecord()\n\t\t);\n\n\t\tconst changedKeys = Object.keys( changes );\n\n\t\tif ( 0 === changedKeys.length ) {\n\t\t\treturn;\n\t\t}\n\n\t\tlog( 'updateEntityRecord', 'changes', entityId, {\n\t\t\tchangedKeys,\n\t\t} );\n\t\thandlers.editRecord( changes );\n\t}\n\n\t/**\n\t * Create object meta to persist the CRDT document in the entity record.\n\t *\n\t * @param {ObjectType} objectType Object type.\n\t * @param {ObjectID}   objectId   Object ID.\n\t */\n\tfunction createPersistedCRDTDoc(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID\n\t): string | null {\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tconst entityState = entityStates.get( entityId );\n\n\t\tif ( ! entityState?.ydoc ) {\n\t\t\treturn null;\n\t\t}\n\n\t\treturn serializeCrdtDoc( entityState.ydoc );\n\t}\n\n\t// Collect internal functions so that they can be wrapped before calling.\n\tconst internal = {\n\t\tapplyPersistedCrdtDoc: debugWrap( _applyPersistedCrdtDoc ),\n\t\tupdateEntityRecord: debugWrap( _updateEntityRecord ),\n\t};\n\n\t// Wrap and return the public API.\n\treturn {\n\t\tcreatePersistedCRDTDoc: debugWrap( createPersistedCRDTDoc ),\n\t\tgetAwareness,\n\t\tload: debugWrap( loadEntity ),\n\t\tloadCollection: debugWrap( loadCollection ),\n\t\t// Use getter to ensure we always return the current value of `undoManager`.\n\t\tget undoManager(): SyncUndoManager | undefined {\n\t\t\treturn undoManager;\n\t\t},\n\t\tunload: debugWrap( unloadEntity ),\n\t\tupdate: debugWrap( yieldToEventLoop( updateCRDTDoc ) ),\n\t};\n}\n"],
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It\n * creates Yjs documents, connects to providers, creates awareness instances,\n * and coordinates with the `core-data` store.\n *\n * @param debug Whether to enable performance and debug logging.\n */\nexport function createSyncManager( debug = false ): SyncManager {\n\tconst debugWrap = debug ? logPerformanceTiming : passThru;\n\tconst collectionStates: Map< ObjectType, CollectionState > = new Map();\n\tconst entityStates: Map< EntityID, EntityState > = new Map();\n\n\t/**\n\t * A \"sync-aware\" undo manager for all synced entities. It is lazily created\n\t * when the first entity is loaded.\n\t *\n\t * IMPORTANT: In Gutenberg, the undo manager is effectively global and manages\n\t * undo/redo state for all entities. If the default WPUndoManager is used,\n\t * changes to entities are recorded in the `editEntityRecord` action:\n\t *\n\t * https://github.com/WordPress/gutenberg/blob/b63451e26e3c91b6bb291a2f9994722e3850417e/packages/core-data/src/actions.js#L428-L442\n\t *\n\t * In contrast, the `SyncUndoManager` only manages undo/redo for entities that\n\t * **are being synced by this sync manager**. The `addRecord` method is still\n\t * called in the code linked above, but it is a no-op. Yjs automatically tracks\n\t * changes to entities via the associated CRDT doc:\n\t *\n\t * https://github.com/WordPress/gutenberg/blob/b63451e26e3c91b6bb291a2f9994722e3850417e/packages/sync/src/undo-manager.ts#L42-L48\n\t *\n\t * This means that if at least one entity is being synced, then undo/redo\n\t * operations will be **restricted to synced entities only.**\n\t *\n\t * We could improve the `SyncUndoManager` to also track non-synced entities by\n\t * delegating to a secondary `WPUndoManager`, but this would add complexity\n\t * since we would need to maintain two separate undo/redo stacks and ensure\n\t * that they retain ordering and integrity.\n\t *\n\t * However, we also anticipate that most entities being edited in Gutenberg\n\t * will be synced entities (e.g. posts, pages, templates, template parts,\n\t * etc.), so this limitation may be temporary.\n\t */\n\tlet undoManager: SyncUndoManager | undefined;\n\n\t/**\n\t * Log debug messages if debugging is enabled.\n\t *\n\t * @param component The component or context related to the log message\n\t * @param message   The debug message\n\t * @param entityId  The entity ID related to the log message\n\t * @param context   Additional debug context\n\t */\n\tfunction log(\n\t\tcomponent: string,\n\t\tmessage: string,\n\t\tentityId: string,\n\t\tcontext: object = {}\n\t): void {\n\t\tif ( ! debug ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// eslint-disable-next-line no-console\n\t\tconsole.log( `[SyncManager][${ component }]: ${ message }`, {\n\t\t\t...context,\n\t\t\tentityId,\n\t\t} );\n\t}\n\n\t/**\n\t * Load an entity for syncing and manage its lifecycle.\n\t *\n\t * @param {SyncConfig}     syncConfig Sync configuration for the object type.\n\t * @param {ObjectType}     objectType Object type.\n\t * @param {ObjectID}       objectId   Object ID.\n\t * @param {ObjectData}     record     Entity record representing this object type.\n\t * @param {RecordHandlers} handlers   Handlers for updating and fetching the record.\n\t */\n\tasync function loadEntity(\n\t\tsyncConfig: SyncConfig,\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID,\n\t\trecord: ObjectData,\n\t\thandlers: RecordHandlers\n\t): Promise< void > {\n\t\tconst providerCreators = getProviderCreators();\n\t\tconst entityId = getEntityId( objectType, objectId );\n\n\t\tif ( 0 === providerCreators.length ) {\n\t\t\tlog( 'loadEntity', 'no providers, skipping', entityId );\n\t\t\treturn; // No provider creators, so syncing is effectively disabled.\n\t\t}\n\n\t\tif ( entityStates.has( entityId ) ) {\n\t\t\tlog( 'loadEntity', 'already loaded', entityId );\n\t\t\treturn; // Already bootstrapped.\n\t\t}\n\n\t\tlog( 'loadEntity', 'loading', entityId );\n\n\t\thandlers = {\n\t\t\taddUndoMeta: debugWrap( handlers.addUndoMeta ),\n\t\t\teditRecord: debugWrap( handlers.editRecord ),\n\t\t\tgetEditedRecord: debugWrap( handlers.getEditedRecord ),\n\t\t\tonStatusChange: debugWrap( handlers.onStatusChange ),\n\t\t\trefetchRecord: debugWrap( handlers.refetchRecord ),\n\t\t\trestoreUndoMeta: debugWrap( handlers.restoreUndoMeta ),\n\t\t\tsaveRecord: debugWrap( handlers.saveRecord ),\n\t\t};\n\n\t\tconst ydoc = createYjsDoc( { objectType } );\n\t\tconst recordMap = ydoc.getMap( CRDT_RECORD_MAP_KEY );\n\t\tconst stateMap = ydoc.getMap( CRDT_STATE_MAP_KEY );\n\t\tconst now = Date.now();\n\n\t\t// Clean up providers and in-memory state when the entity is unloaded.\n\t\tconst unload = (): void => {\n\t\t\tlog( 'loadEntity', 'unloading', entityId );\n\t\t\tproviderResults.forEach( ( result ) => result.destroy() );\n\t\t\thandlers.onStatusChange( null );\n\t\t\trecordMap.unobserveDeep( onRecordUpdate );\n\t\t\tstateMap.unobserve( onStateMapUpdate );\n\t\t\tydoc.destroy();\n\t\t\tentityStates.delete( entityId );\n\t\t};\n\n\t\t// If the sync config supports awareness, create it.\n\t\tconst awareness = syncConfig.createAwareness?.( ydoc, objectId );\n\n\t\t// When the CRDT document is updated by an UndoManager or a connection (not\n\t\t// a local origin), update the local store.\n\t\tconst onRecordUpdate = (\n\t\t\t_events: Y.YEvent< any >[],\n\t\t\ttransaction: Y.Transaction\n\t\t): void => {\n\t\t\tif (\n\t\t\t\ttransaction.local &&\n\t\t\t\t! ( transaction.origin instanceof Y.UndoManager )\n\t\t\t) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tvoid internal.updateEntityRecord( objectType, objectId );\n\t\t};\n\n\t\tconst onStateMapUpdate = (\n\t\t\tevent: Y.YMapEvent< unknown >,\n\t\t\ttransaction: Y.Transaction\n\t\t) => {\n\t\t\tif ( transaction.local ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tevent.keysChanged.forEach( ( key ) => {\n\t\t\t\tswitch ( key ) {\n\t\t\t\t\tcase SAVED_AT_KEY:\n\t\t\t\t\t\tconst newValue = stateMap.get( SAVED_AT_KEY );\n\t\t\t\t\t\tif ( 'number' === typeof newValue && newValue > now ) {\n\t\t\t\t\t\t\t// Another peer has saved the record. Refetch it so that we have\n\t\t\t\t\t\t\t// a correct understanding of our own unsaved edits.\n\t\t\t\t\t\t\tlog( 'loadEntity', 'refetching record', entityId );\n\t\t\t\t\t\t\tvoid handlers.refetchRecord().catch( () => {} );\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t} );\n\t\t};\n\n\t\t// Lazily create the undo manager when the first entity is loaded.\n\t\tif ( ! undoManager ) {\n\t\t\tundoManager = createUndoManager();\n\t\t}\n\n\t\tconst { addUndoMeta, restoreUndoMeta } = handlers;\n\t\tundoManager.addToScope( recordMap, {\n\t\t\taddUndoMeta,\n\t\t\trestoreUndoMeta,\n\t\t} );\n\n\t\tconst entityState: EntityState = {\n\t\t\tawareness,\n\t\t\thandlers,\n\t\t\tobjectId,\n\t\t\tobjectType,\n\t\t\tsyncConfig,\n\t\t\tunload,\n\t\t\tydoc,\n\t\t};\n\n\t\tentityStates.set( entityId, entityState );\n\n\t\t// Create providers for the given entity and its Yjs document.\n\t\tlog( 'loadEntity', 'connecting', entityId );\n\t\tconst providerResults = await Promise.all(\n\t\t\tproviderCreators.map( async ( create ) => {\n\t\t\t\tconst provider = await create( {\n\t\t\t\t\tobjectType,\n\t\t\t\t\tobjectId,\n\t\t\t\t\tydoc,\n\t\t\t\t\tawareness,\n\t\t\t\t} );\n\n\t\t\t\t// Attach status listener after provider creation.\n\t\t\t\tprovider.on( 'status', handlers.onStatusChange );\n\n\t\t\t\treturn provider;\n\t\t\t} )\n\t\t);\n\n\t\t// Attach observers.\n\t\trecordMap.observeDeep( onRecordUpdate );\n\t\tstateMap.observe( onStateMapUpdate );\n\n\t\t// Initialize the Yjs document with the necessary CRDT state.\n\t\tinitializeYjsDoc( ydoc );\n\n\t\t// Get and apply the persisted CRDT document, if it exists.\n\t\tinternal.applyPersistedCrdtDoc( objectType, objectId, record );\n\t}\n\n\t/**\n\t * Load a collection for syncing and manage its lifecycle.\n\t *\n\t * @param {SyncConfig}         syncConfig Sync configuration for the object type.\n\t * @param {ObjectType}         objectType Object type.\n\t * @param {CollectionHandlers} handlers   Handlers for updating the collection.\n\t */\n\tasync function loadCollection(\n\t\tsyncConfig: SyncConfig,\n\t\tobjectType: ObjectType,\n\t\thandlers: CollectionHandlers\n\t): Promise< void > {\n\t\tconst providerCreators: ProviderCreator[] = getProviderCreators();\n\t\tconst entityId = getEntityId( objectType, null );\n\n\t\tif ( 0 === providerCreators.length ) {\n\t\t\tlog( 'loadCollection', 'no providers, skipping', entityId );\n\t\t\treturn; // No provider creators, so syncing is effectively disabled.\n\t\t}\n\n\t\tif ( collectionStates.has( objectType ) ) {\n\t\t\tlog( 'loadCollection', 'already loaded', entityId );\n\t\t\treturn; // Already loaded.\n\t\t}\n\n\t\tlog( 'loadCollection', 'loading', entityId );\n\n\t\tconst ydoc = createYjsDoc( { collection: true, objectType } );\n\t\tconst stateMap = ydoc.getMap( CRDT_STATE_MAP_KEY );\n\t\tconst now = Date.now();\n\n\t\t// Clean up providers and in-memory state when the entity is unloaded.\n\t\tconst unload = (): void => {\n\t\t\tlog( 'loadCollection', 'unloading', entityId );\n\t\t\tproviderResults.forEach( ( result ) => result.destroy() );\n\t\t\thandlers.onStatusChange( null );\n\t\t\tstateMap.unobserve( onStateMapUpdate );\n\t\t\tydoc.destroy();\n\t\t\tcollectionStates.delete( objectType );\n\t\t};\n\n\t\tconst onStateMapUpdate = (\n\t\t\tevent: Y.YMapEvent< unknown >,\n\t\t\ttransaction: Y.Transaction\n\t\t) => {\n\t\t\tif ( transaction.local ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tevent.keysChanged.forEach( ( key ) => {\n\t\t\t\tswitch ( key ) {\n\t\t\t\t\tcase SAVED_AT_KEY:\n\t\t\t\t\t\tconst newValue = stateMap.get( SAVED_AT_KEY );\n\t\t\t\t\t\tif ( 'number' === typeof newValue && newValue > now ) {\n\t\t\t\t\t\t\t// Another peer has mutated the collection. Refetch it so that we\n\t\t\t\t\t\t\t// obtain the updated records.\n\t\t\t\t\t\t\tvoid handlers.refetchRecords().catch( () => {} );\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t} );\n\t\t};\n\n\t\t// If the sync config supports awareness, create it.\n\t\tconst awareness = syncConfig.createAwareness?.( ydoc );\n\n\t\tconst collectionState: CollectionState = {\n\t\t\tawareness,\n\t\t\thandlers,\n\t\t\tsyncConfig,\n\t\t\tunload,\n\t\t\tydoc,\n\t\t};\n\n\t\tcollectionStates.set( objectType, collectionState );\n\n\t\t// Create providers for the given entity and its Yjs document.\n\t\tlog( 'loadCollection', 'connecting', entityId );\n\t\tconst providerResults = await Promise.all(\n\t\t\tproviderCreators.map( async ( create ) => {\n\t\t\t\tconst provider = await create( {\n\t\t\t\t\tawareness,\n\t\t\t\t\tobjectType,\n\t\t\t\t\tobjectId: null,\n\t\t\t\t\tydoc,\n\t\t\t\t} );\n\n\t\t\t\t// Attach status listener after provider creation.\n\t\t\t\tprovider.on( 'status', handlers.onStatusChange );\n\n\t\t\t\treturn provider;\n\t\t\t} )\n\t\t);\n\n\t\t// Attach observers.\n\t\tstateMap.observe( onStateMapUpdate );\n\n\t\t// Initialize the Yjs document with the necessary CRDT state.\n\t\tinitializeYjsDoc( ydoc );\n\t}\n\n\t/**\n\t * Unload an entity, stop syncing, destroy its in-memory state, and trigger an\n\t * update of the collection.\n\t *\n\t * @param {ObjectType} objectType Object type to discard.\n\t * @param {ObjectID}   objectId   Object ID to discard, or null for collections.\n\t */\n\tfunction unloadEntity( objectType: ObjectType, objectId: ObjectID ): void {\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tlog( 'unloadEntity', 'unloading', entityId );\n\t\tentityStates.get( entityId )?.unload();\n\t\tupdateCRDTDoc( objectType, null, {}, origin, { isSave: true } );\n\t}\n\n\t/**\n\t * Get the awareness instance for the given object type and object ID, if supported.\n\t *\n\t * @template {Awareness} State\n\t * @param {ObjectType} objectType Object type.\n\t * @param {ObjectID}   objectId   Object ID.\n\t * @return {State | undefined} The awareness instance, or undefined if not supported.\n\t */\n\tfunction getAwareness< State extends Awareness >(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID\n\t): State | undefined {\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tconst entityState = entityStates.get( entityId );\n\n\t\tif ( ! entityState || ! entityState.awareness ) {\n\t\t\treturn undefined;\n\t\t}\n\n\t\treturn entityState.awareness as State;\n\t}\n\n\t/**\n\t * Load and inspect the persisted CRDT document. If supported and it exists,\n\t * compare it against the current entity record. If there are differences,\n\t * apply the changes from the entity record.\n\t *\n\t * @param {ObjectType} objectType Object type.\n\t * @param {ObjectID}   objectId   Object ID.\n\t * @param {ObjectData} record     Entity record representing this object type.\n\t */\n\tfunction _applyPersistedCrdtDoc(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID,\n\t\trecord: ObjectData\n\t): void {\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tconst entityState = entityStates.get( entityId );\n\n\t\tif ( ! entityState ) {\n\t\t\tlog( 'applyPersistedCrdtDoc', 'no entity state', entityId );\n\t\t\treturn;\n\t\t}\n\n\t\tconst {\n\t\t\thandlers,\n\t\t\tsyncConfig: {\n\t\t\t\tapplyChangesToCRDTDoc,\n\t\t\t\tgetChangesFromCRDTDoc,\n\t\t\t\tgetPersistedCRDTDoc,\n\t\t\t},\n\t\t\tydoc: targetDoc,\n\t\t} = entityState;\n\n\t\t// Get the persisted CRDT document, if it exists.\n\t\tconst serialized = getPersistedCRDTDoc?.( record );\n\t\tconst tempDoc = serialized ? deserializeCrdtDoc( serialized ) : null;\n\n\t\tif ( ! tempDoc ) {\n\t\t\tlog( 'applyPersistedCrdtDoc', 'no persisted doc', entityId );\n\t\t\t// Apply the current record as changes and trigger a save, which will\n\t\t\t// persist the CRDT document. (The entity should call `createPersistedCRDTDoc`\n\t\t\t// via its pre-persist hook.)\n\t\t\ttargetDoc.transact( () => {\n\t\t\t\tapplyChangesToCRDTDoc( targetDoc, record );\n\t\t\t\thandlers.saveRecord();\n\t\t\t}, LOCAL_SYNC_MANAGER_ORIGIN );\n\t\t\treturn;\n\t\t}\n\n\t\t// Apply the persisted document to the current document as a single update.\n\t\t// This is done even if the persisted document has been invalidated. This\n\t\t// prevents a newly joining peer (or refreshing user) from re-initializing\n\t\t// the CRDT document (the \"initialization problem\").\n\t\t//\n\t\t// IMPORTANT: Do not wrap this in a transaction with the local origin. It\n\t\t// effectively advances the state vector for the current client, which causes\n\t\t// Yjs to think that another client is using this client ID.\n\t\tconst update = Y.encodeStateAsUpdateV2( tempDoc );\n\t\tY.applyUpdateV2( targetDoc, update );\n\n\t\t// Compute the differences between the persisted doc and the current\n\t\t// record. This can happen when:\n\t\t//\n\t\t// 1. The server makes updates on save that mutate the entity. Example: On\n\t\t//    initial save, the server adds the \"Uncategorized\" category to the\n\t\t//    post.\n\t\t// 2. An \"out-of-band\" update occurs. Example: a WP-CLI command or direct\n\t\t//    database update mutates the entity.\n\t\t// 3. Unsaved changes are synced from a peer _before_ this code runs. We\n\t\t//    can't control when (or if) remote changes are synced, so this is a\n\t\t//    race condition.\n\t\tconst invalidations = getChangesFromCRDTDoc( tempDoc, record );\n\t\tconst invalidatedKeys = Object.keys( invalidations );\n\n\t\t// Destroy the temporary document to prevent leaks.\n\t\ttempDoc.destroy();\n\n\t\tif ( 0 === invalidatedKeys.length ) {\n\t\t\tlog( 'applyPersistedCrdtDoc', 'valid persisted doc', entityId );\n\t\t\t// The persisted CRDT document is valid. There are no updates to apply.\n\t\t\treturn;\n\t\t}\n\n\t\tlog( 'applyPersistedCrdtDoc', 'invalidated keys', entityId, {\n\t\t\tinvalidatedKeys,\n\t\t} );\n\n\t\t// Use the invalidated keys to get the updated values from the entity.\n\t\tconst changes = invalidatedKeys.reduce(\n\t\t\t( acc, key ) =>\n\t\t\t\tObject.assign( acc, {\n\t\t\t\t\t[ key ]: record[ key ],\n\t\t\t\t} ),\n\t\t\t{}\n\t\t);\n\n\t\t// Apply the changes and trigger a save, which will persist the CRDT\n\t\t// document. (The entity should call `createPersistedCRDTDoc` via its\n\t\t// pre-persist hook.)\n\t\ttargetDoc.transact( () => {\n\t\t\tapplyChangesToCRDTDoc( targetDoc, changes );\n\t\t\thandlers.saveRecord();\n\t\t}, LOCAL_SYNC_MANAGER_ORIGIN );\n\t}\n\n\t/**\n\t * Update CRDT document with changes from the local store.\n\t *\n\t * @param {ObjectType}               objectType             Object type.\n\t * @param {ObjectID}                 objectId               Object ID.\n\t * @param {Partial< ObjectData >}    changes                Updates to make.\n\t * @param {string}                   origin                 The source of change.\n\t * @param {SyncManagerUpdateOptions} options                Optional flags for the update.\n\t * @param {boolean}                  options.isSave         Whether this update is part of a save operation. Defaults to false.\n\t * @param {boolean}                  options.isNewUndoLevel Whether to create a new undo level for this change. Defaults to false.\n\t */\n\tfunction updateCRDTDoc(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID | null,\n\t\tchanges: Partial< ObjectData >,\n\t\torigin: string,\n\t\toptions: SyncManagerUpdateOptions = {}\n\t): void {\n\t\tconst { isSave = false, isNewUndoLevel = false } = options;\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tconst entityState = entityStates.get( entityId );\n\t\tconst collectionState = collectionStates.get( objectType );\n\n\t\tif ( entityState ) {\n\t\t\tconst { syncConfig, ydoc } = entityState;\n\n\t\t\t// If this is change should create a new undo level, tell the undo\n\t\t\t// manager to stop capturing and create a new undo group.\n\t\t\t// We can't do this in the undo manager itself, because addRecord() is\n\t\t\t// called after the CRDT changes have been applied, and we want to\n\t\t\t// ensure that the undo set is created before the changes are applied.\n\t\t\tif ( isNewUndoLevel && undoManager ) {\n\t\t\t\tundoManager.stopCapturing?.();\n\t\t\t}\n\n\t\t\tydoc.transact( () => {\n\t\t\t\tlog( 'updateCRDTDoc', 'applying changes', entityId, {\n\t\t\t\t\tchangedKeys: Object.keys( changes ),\n\t\t\t\t} );\n\t\t\t\tsyncConfig.applyChangesToCRDTDoc( ydoc, changes );\n\n\t\t\t\tif ( isSave ) {\n\t\t\t\t\tmarkEntityAsSaved( ydoc );\n\t\t\t\t}\n\t\t\t}, origin );\n\t\t}\n\n\t\tif ( collectionState && isSave ) {\n\t\t\tcollectionState.ydoc.transact( () => {\n\t\t\t\tmarkEntityAsSaved( collectionState.ydoc );\n\t\t\t}, origin );\n\t\t}\n\t}\n\n\t/**\n\t * Update the entity record in the local store with changes from the CRDT\n\t * document.\n\t *\n\t * @param {ObjectType} objectType Object type of record to update.\n\t * @param {ObjectID}   objectId   Object ID of record to update.\n\t */\n\tasync function _updateEntityRecord(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID\n\t): Promise< void > {\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tconst entityState = entityStates.get( entityId );\n\n\t\tif ( ! entityState ) {\n\t\t\tlog( 'updateEntityRecord', 'no entity state', entityId );\n\t\t\treturn;\n\t\t}\n\n\t\tconst { handlers, syncConfig, ydoc } = entityState;\n\n\t\t// Determine which synced properties have actually changed by comparing\n\t\t// them against the current edited entity record.\n\t\tconst changes = syncConfig.getChangesFromCRDTDoc(\n\t\t\tydoc,\n\t\t\tawait handlers.getEditedRecord()\n\t\t);\n\n\t\tconst changedKeys = Object.keys( changes );\n\n\t\tif ( 0 === changedKeys.length ) {\n\t\t\treturn;\n\t\t}\n\n\t\tlog( 'updateEntityRecord', 'changes', entityId, {\n\t\t\tchangedKeys,\n\t\t} );\n\t\thandlers.editRecord( changes );\n\t}\n\n\t/**\n\t * Create object meta to persist the CRDT document in the entity record.\n\t *\n\t * @param {ObjectType} objectType Object type.\n\t * @param {ObjectID}   objectId   Object ID.\n\t */\n\tasync function createPersistedCRDTDoc(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID\n\t): Promise< string | null > {\n\t\tconst entityId = getEntityId( objectType, objectId );\n\t\tconst entityState = entityStates.get( entityId );\n\n\t\tif ( ! entityState?.ydoc ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// Y.Doc updates are deferred via yieldToEventLoop. Await a promise that\n\t\t// resolves on the next tick of the event loop so pending updates are flushed\n\t\t// before we serialize the document.\n\t\tawait new Promise( ( resolve ) => setTimeout( resolve, 0 ) );\n\n\t\treturn serializeCrdtDoc( entityState.ydoc );\n\t}\n\n\t// Collect internal functions so that they can be wrapped before calling.\n\tconst internal = {\n\t\tapplyPersistedCrdtDoc: debugWrap( _applyPersistedCrdtDoc ),\n\t\tupdateEntityRecord: debugWrap( _updateEntityRecord ),\n\t};\n\n\t// Wrap and return the public API.\n\treturn {\n\t\tcreatePersistedCRDTDoc: debugWrap( createPersistedCRDTDoc ),\n\t\tgetAwareness,\n\t\tload: debugWrap( loadEntity ),\n\t\tloadCollection: debugWrap( loadCollection ),\n\t\t// Use getter to ensure we always return the current value of `undoManager`.\n\t\tget undoManager(): SyncUndoManager | undefined {\n\t\t\treturn undoManager;\n\t\t},\n\t\tunload: debugWrap( unloadEntity ),\n\t\tupdate: debugWrap( yieldToEventLoop( updateCRDTDoc ) ),\n\t};\n}\n"],
+  "mappings": 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   "names": ["SAVED_AT_KEY", "origin"]
 }

build/private-apis.cjs

@@ -39,2 +39,3 @@ "use strict";
 var import_manager = require("./manager.cjs");
+var import_polling_manager = require("./providers/http-polling/polling-manager.cjs");
 var import_Delta = __toESM(require("./quill-delta/Delta.cjs"));
@@ -47,3 +48,4 @@ var privateApis = {};
   CRDT_RECORD_MAP_KEY: import_config.CRDT_RECORD_MAP_KEY,
-  LOCAL_EDITOR_ORIGIN: import_config.LOCAL_EDITOR_ORIGIN
+  LOCAL_EDITOR_ORIGIN: import_config.LOCAL_EDITOR_ORIGIN,
+  retrySyncConnection: () => import_polling_manager.pollingManager.retryNow()
 });
@@ -50,0 +52,0 @@ // Annotate the CommonJS export names for ESM import in node:

build/private-apis.cjs.map

 {
   "version": 3,
   "sources": ["../src/private-apis.ts"],
-  "sourcesContent": ["/**\n * Internal dependencies\n */\nimport {\n\tCRDT_DOC_META_PERSISTENCE_KEY,\n\tCRDT_RECORD_MAP_KEY,\n\tLOCAL_EDITOR_ORIGIN,\n} from './config';\nimport { lock } from './lock-unlock';\nimport { createSyncManager } from './manager';\nimport { default as Delta } from './quill-delta/Delta';\n\nexport const privateApis = {};\n\nlock( privateApis, {\n\tcreateSyncManager,\n\tDelta,\n\tCRDT_DOC_META_PERSISTENCE_KEY,\n\tCRDT_RECORD_MAP_KEY,\n\tLOCAL_EDITOR_ORIGIN,\n} );\n"],
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+  "sourcesContent": ["/**\n * Internal dependencies\n */\nimport {\n\tCRDT_DOC_META_PERSISTENCE_KEY,\n\tCRDT_RECORD_MAP_KEY,\n\tLOCAL_EDITOR_ORIGIN,\n} from './config';\nimport { lock } from './lock-unlock';\nimport { createSyncManager } from './manager';\nimport { pollingManager } from './providers/http-polling/polling-manager';\nimport { default as Delta } from './quill-delta/Delta';\n\nexport const privateApis = {};\n\nlock( privateApis, {\n\tcreateSyncManager,\n\tDelta,\n\tCRDT_DOC_META_PERSISTENCE_KEY,\n\tCRDT_RECORD_MAP_KEY,\n\tLOCAL_EDITOR_ORIGIN,\n\tretrySyncConnection: () => pollingManager.retryNow(),\n} );\n"],
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   "names": ["Delta"]
 }

build/providers/http-polling/http-polling-provider.cjs

@@ -70,9 +70,10 @@ "use strict";
   /**
-   * Emit connection status.
+   * Emit connection status, passing the full object through so that
+   * additional fields (e.g. `retryInMs`) are preserved for consumers.
    *
-   * @param status        The connection status
-   * @param status.error  Optional error information when status is 'disconnected'
-   * @param status.status The connection status ('connected', 'connecting', 'disconnected')
+   * @param connectionStatus The connection status object
    */
-  emitStatus = ({ error, status }) => {
+  emitStatus = (connectionStatus) => {
+    const { status } = connectionStatus;
+    const error = status === "disconnected" ? connectionStatus.error : void 0;
     if (this.status === status && !error) {
@@ -86,3 +87,3 @@ return;
     this.status = status;
-    this.emit("status", [{ error, status }]);
+    this.emit("status", [connectionStatus]);
   };
@@ -89,0 +90,0 @@ /**

build/providers/http-polling/http-polling-provider.cjs.map

 {
   "version": 3,
   "sources": ["../../../src/providers/http-polling/http-polling-provider.ts"],
-  "sourcesContent": ["/**\n * External dependencies\n */\nimport type * as Y from 'yjs';\nimport { ObservableV2 } from 'lib0/observable';\nimport { Awareness } from 'y-protocols/awareness';\n\n/**\n * Internal dependencies\n */\nimport type {\n\tConnectionStatus,\n\tProviderCreator,\n\tProviderCreatorResult,\n} from '../../types';\nimport { pollingManager } from './polling-manager';\n\nexport interface ProviderOptions {\n\tawareness?: Awareness;\n\tdebug?: boolean;\n\troom: string;\n\tydoc: Y.Doc;\n}\n\n/**\n * Event types for HttpPollingProvider.\n * ObservableV2 expects event handlers as functions.\n */\ntype HttpPollingEvents = {\n\tstatus: ( status: ConnectionStatus ) => void;\n};\n\n/**\n * Yjs provider that uses HTTP polling for real-time synchronization. It manages\n * document updates and awareness states through a central sync server.\n */\nclass HttpPollingProvider extends ObservableV2< HttpPollingEvents > {\n\tprotected awareness: Awareness;\n\tprotected status: ConnectionStatus[ 'status' ] = 'disconnected';\n\tprotected synced = false;\n\n\tpublic constructor( protected options: ProviderOptions ) {\n\t\tsuper();\n\t\tthis.log( 'Initializing', { room: options.room } );\n\n\t\tthis.awareness = options.awareness ?? new Awareness( options.ydoc );\n\t\tthis.connect();\n\t}\n\n\t/**\n\t * Connect to the endpoint and initialize sync.\n\t */\n\tpublic connect(): void {\n\t\tthis.log( 'Connecting' );\n\n\t\tpollingManager.registerRoom( {\n\t\t\troom: this.options.room,\n\t\t\tdoc: this.options.ydoc,\n\t\t\tawareness: this.awareness,\n\t\t\tlog: this.log,\n\t\t\tonStatusChange: this.emitStatus,\n\t\t\tonSync: this.onSync,\n\t\t} );\n\t}\n\n\t/**\n\t * Destroy the provider and cleanup resources.\n\t */\n\tpublic destroy(): void {\n\t\tthis.disconnect();\n\t\tsuper.destroy();\n\t}\n\n\t/**\n\t * Disconnect the provider and allow reconnection later.\n\t */\n\tpublic disconnect(): void {\n\t\tthis.log( 'Disconnecting' );\n\n\t\tpollingManager.unregisterRoom( this.options.room );\n\t\tthis.emitStatus( { status: 'disconnected' } );\n\t}\n\n\t/**\n\t * Emit connection status.\n\t *\n\t * @param status        The connection status\n\t * @param status.error  Optional error information when status is 'disconnected'\n\t * @param status.status The connection status ('connected', 'connecting', 'disconnected')\n\t */\n\tprotected emitStatus = ( { error, status }: ConnectionStatus ): void => {\n\t\tif ( this.status === status && ! error ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Only emit 'connecting' status if transitioning from 'disconnected'.\n\t\tif ( status === 'connecting' && this.status !== 'disconnected' ) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis.log( 'Status change', { status, error } );\n\n\t\t// ObservableV2 expects arguments as an array\n\t\tthis.status = status;\n\t\tthis.emit( 'status', [ { error, status } ] );\n\t};\n\n\t/**\n\t * Log debug messages if debugging is enabled.\n\t *\n\t * @param message The debug message\n\t * @param debug   Additional debug information\n\t */\n\tprotected log = ( message: string, debug: object = {} ): void => {\n\t\tif ( this.options.debug ) {\n\t\t\t// eslint-disable-next-line no-console\n\t\t\tconsole.log( `[${ this.constructor.name }]: ${ message }`, {\n\t\t\t\troom: this.options.room,\n\t\t\t\t...debug,\n\t\t\t} );\n\t\t}\n\t};\n\n\t/**\n\t * Handle synchronization events from the polling manager.\n\t */\n\tprotected onSync = (): void => {\n\t\tif ( ! this.synced ) {\n\t\t\tthis.synced = true;\n\t\t\tthis.log( 'Synced' );\n\t\t}\n\t};\n}\n\n/**\n * Create a provider creator function for the HttpPollingProvider\n */\nexport function createHttpPollingProvider(): ProviderCreator {\n\treturn async ( {\n\t\tawareness,\n\t\tobjectType,\n\t\tobjectId,\n\t\tydoc,\n\t} ): Promise< ProviderCreatorResult > => {\n\t\t// Generate room name from objectType and objectId\n\t\tconst room = objectId ? `${ objectType }:${ objectId }` : objectType;\n\t\tconst provider = new HttpPollingProvider( {\n\t\t\tawareness,\n\t\t\t// debug: true,\n\t\t\troom,\n\t\t\tydoc,\n\t\t} );\n\n\t\treturn {\n\t\t\tdestroy: () => provider.destroy(),\n\t\t\t// Adapter: ObservableV2.on is compatible with ProviderOn\n\t\t\t// The callback receives data as the first parameter\n\t\t\ton: ( event, callback ) => {\n\t\t\t\tprovider.on( event, callback );\n\t\t\t},\n\t\t};\n\t};\n}\n"],
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+  "sourcesContent": ["/**\n * External dependencies\n */\nimport type * as Y from 'yjs';\nimport { ObservableV2 } from 'lib0/observable';\nimport { Awareness } from 'y-protocols/awareness';\n\n/**\n * Internal dependencies\n */\nimport type {\n\tConnectionStatus,\n\tProviderCreator,\n\tProviderCreatorResult,\n} from '../../types';\nimport { pollingManager } from './polling-manager';\n\nexport interface ProviderOptions {\n\tawareness?: Awareness;\n\tdebug?: boolean;\n\troom: string;\n\tydoc: Y.Doc;\n}\n\n/**\n * Event types for HttpPollingProvider.\n * ObservableV2 expects event handlers as functions.\n */\ntype HttpPollingEvents = {\n\tstatus: ( status: ConnectionStatus ) => void;\n};\n\n/**\n * Yjs provider that uses HTTP polling for real-time synchronization. It manages\n * document updates and awareness states through a central sync server.\n */\nclass HttpPollingProvider extends ObservableV2< HttpPollingEvents > {\n\tprotected awareness: Awareness;\n\tprotected status: ConnectionStatus[ 'status' ] = 'disconnected';\n\tprotected synced = false;\n\n\tpublic constructor( protected options: ProviderOptions ) {\n\t\tsuper();\n\t\tthis.log( 'Initializing', { room: options.room } );\n\n\t\tthis.awareness = options.awareness ?? new Awareness( options.ydoc );\n\t\tthis.connect();\n\t}\n\n\t/**\n\t * Connect to the endpoint and initialize sync.\n\t */\n\tpublic connect(): void {\n\t\tthis.log( 'Connecting' );\n\n\t\tpollingManager.registerRoom( {\n\t\t\troom: this.options.room,\n\t\t\tdoc: this.options.ydoc,\n\t\t\tawareness: this.awareness,\n\t\t\tlog: this.log,\n\t\t\tonStatusChange: this.emitStatus,\n\t\t\tonSync: this.onSync,\n\t\t} );\n\t}\n\n\t/**\n\t * Destroy the provider and cleanup resources.\n\t */\n\tpublic destroy(): void {\n\t\tthis.disconnect();\n\t\tsuper.destroy();\n\t}\n\n\t/**\n\t * Disconnect the provider and allow reconnection later.\n\t */\n\tpublic disconnect(): void {\n\t\tthis.log( 'Disconnecting' );\n\n\t\tpollingManager.unregisterRoom( this.options.room );\n\t\tthis.emitStatus( { status: 'disconnected' } );\n\t}\n\n\t/**\n\t * Emit connection status, passing the full object through so that\n\t * additional fields (e.g. `retryInMs`) are preserved for consumers.\n\t *\n\t * @param connectionStatus The connection status object\n\t */\n\tprotected emitStatus = ( connectionStatus: ConnectionStatus ): void => {\n\t\tconst { status } = connectionStatus;\n\t\tconst error =\n\t\t\tstatus === 'disconnected' ? connectionStatus.error : undefined;\n\n\t\tif ( this.status === status && ! error ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Only emit 'connecting' status if transitioning from 'disconnected'.\n\t\tif ( status === 'connecting' && this.status !== 'disconnected' ) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis.log( 'Status change', { status, error } );\n\n\t\t// ObservableV2 expects arguments as an array\n\t\tthis.status = status;\n\t\tthis.emit( 'status', [ connectionStatus ] );\n\t};\n\n\t/**\n\t * Log debug messages if debugging is enabled.\n\t *\n\t * @param message The debug message\n\t * @param debug   Additional debug information\n\t */\n\tprotected log = ( message: string, debug: object = {} ): void => {\n\t\tif ( this.options.debug ) {\n\t\t\t// eslint-disable-next-line no-console\n\t\t\tconsole.log( `[${ this.constructor.name }]: ${ message }`, {\n\t\t\t\troom: this.options.room,\n\t\t\t\t...debug,\n\t\t\t} );\n\t\t}\n\t};\n\n\t/**\n\t * Handle synchronization events from the polling manager.\n\t */\n\tprotected onSync = (): void => {\n\t\tif ( ! this.synced ) {\n\t\t\tthis.synced = true;\n\t\t\tthis.log( 'Synced' );\n\t\t}\n\t};\n}\n\n/**\n * Create a provider creator function for the HttpPollingProvider\n */\nexport function createHttpPollingProvider(): ProviderCreator {\n\treturn async ( {\n\t\tawareness,\n\t\tobjectType,\n\t\tobjectId,\n\t\tydoc,\n\t} ): Promise< ProviderCreatorResult > => {\n\t\t// Generate room name from objectType and objectId\n\t\tconst room = objectId ? `${ objectType }:${ objectId }` : objectType;\n\t\tconst provider = new HttpPollingProvider( {\n\t\t\tawareness,\n\t\t\t// debug: true,\n\t\t\troom,\n\t\t\tydoc,\n\t\t} );\n\n\t\treturn {\n\t\t\tdestroy: () => provider.destroy(),\n\t\t\t// Adapter: ObservableV2.on is compatible with ProviderOn\n\t\t\t// The callback receives data as the first parameter\n\t\t\ton: ( event, callback ) => {\n\t\t\t\tprovider.on( event, callback );\n\t\t\t},\n\t\t};\n\t};\n}\n"],
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   "names": []
 }

build/providers/http-polling/polling-manager.cjs

@@ -45,3 +45,3 @@ "use strict";
 var POLLING_INTERVAL_WITH_COLLABORATORS_IN_MS = 250;
-var POLLING_INTERVAL_BACKGROUND_TAB_IN_MS = 30 * 1e3;
+var POLLING_INTERVAL_BACKGROUND_TAB_IN_MS = 25 * 1e3;
 var MAX_ERROR_BACKOFF_IN_MS = 30 * 1e3;
@@ -182,4 +182,2 @@ var POLLING_MANAGER_ORIGIN = "polling-manager";
       pollingTimeoutId = null;
-    }
-    if (isPolling) {
       poll();
@@ -191,2 +189,3 @@ }
   isPolling = true;
+  pollingTimeoutId = null;
   async function start() {
@@ -275,3 +274,6 @@ if (0 === roomStates.size) {
         roomStates.forEach((state) => {
-          state.onStatusChange({ status: "disconnected" });
+          state.onStatusChange({
+            status: "disconnected",
+            retryInMs: pollInterval
+          });
         });
@@ -364,4 +366,13 @@ }
 }
+function retryNow() {
+  pollInterval = POLLING_INTERVAL_IN_MS * 2;
+  if (pollingTimeoutId) {
+    clearTimeout(pollingTimeoutId);
+    pollingTimeoutId = null;
+    poll();
+  }
+}
 var pollingManager = {
   registerRoom,
+  retryNow,
   unregisterRoom
@@ -368,0 +379,0 @@ };

build/providers/http-polling/polling-manager.cjs.map

 {
   "version": 3,
   "sources": ["../../../src/providers/http-polling/polling-manager.ts"],
-  "sourcesContent": ["/**\n * External dependencies\n */\nimport * as Y from 'yjs';\nimport * as encoding from 'lib0/encoding';\nimport * as decoding from 'lib0/decoding';\nimport type { Awareness } from 'y-protocols/awareness';\nimport { removeAwarenessStates } from 'y-protocols/awareness';\nimport * as syncProtocol from 'y-protocols/sync';\n\n/**\n * Internal dependencies\n */\nimport type { ConnectionStatus } from '../../types';\nimport {\n\ttype AwarenessState,\n\ttype LocalAwarenessState,\n\ttype SyncPayload,\n\ttype SyncUpdate,\n\tSyncUpdateType,\n\ttype UpdateQueue,\n} from './types';\nimport {\n\tbase64ToUint8Array,\n\tcreateSyncUpdate,\n\tcreateUpdateQueue,\n\tpostSyncUpdate,\n\tpostSyncUpdateNonBlocking,\n} from './utils';\n\nconst POLLING_INTERVAL_IN_MS = 1000; // 1 second or 1000 milliseconds\nconst POLLING_INTERVAL_WITH_COLLABORATORS_IN_MS = 250; // 250 milliseconds\nconst POLLING_INTERVAL_BACKGROUND_TAB_IN_MS = 30 * 1000; // 30 seconds\nconst MAX_ERROR_BACKOFF_IN_MS = 30 * 1000; // 30 seconds\nconst POLLING_MANAGER_ORIGIN = 'polling-manager';\n\ntype LogFunction = ( message: string, debug?: object ) => void;\n\ninterface PollingManager {\n\tregisterRoom: ( options: RegisterRoomOptions ) => void;\n\tunregisterRoom: ( room: string ) => void;\n}\n\ninterface RegisterRoomOptions {\n\troom: string;\n\tdoc: Y.Doc;\n\tawareness: Awareness;\n\tlog: LogFunction;\n\tonStatusChange: ( status: ConnectionStatus ) => void;\n\tonSync: () => void;\n}\n\ninterface RoomState {\n\tclientId: number;\n\tcreateCompactionUpdate: () => SyncUpdate;\n\tendCursor: number;\n\tlocalAwarenessState: LocalAwarenessState;\n\tlog: LogFunction;\n\tonStatusChange: ( status: ConnectionStatus ) => void;\n\tprocessAwarenessUpdate: ( state: AwarenessState ) => void;\n\tprocessDocUpdate: ( update: SyncUpdate ) => SyncUpdate | void;\n\tunregister: () => void;\n\tupdateQueue: UpdateQueue;\n}\n\nconst roomStates: Map< string, RoomState > = new Map();\n\n/**\n * Create a compaction update by merging existing updates. This preserves\n * the original operation metadata (client IDs, logical clocks) so that\n * Yjs deduplication works correctly when the compaction is applied.\n *\n * Deprecated: The server is moving towards full state updates for compaction.\n *\n * @param updates The updates to merge\n */\nfunction createDeprecatedCompactionUpdate( updates: SyncUpdate[] ): SyncUpdate {\n\t// Extract only compaction and update types for merging (skip sync-step updates).\n\t// Decode base64 updates to Uint8Array for merging.\n\tconst mergeable = updates\n\t\t.filter( ( u ) =>\n\t\t\t[ SyncUpdateType.COMPACTION, SyncUpdateType.UPDATE ].includes(\n\t\t\t\tu.type\n\t\t\t)\n\t\t)\n\t\t.map( ( u ) => base64ToUint8Array( u.data ) );\n\n\t// Merge all updates while preserving operation metadata.\n\treturn createSyncUpdate(\n\t\tY.mergeUpdates( mergeable ),\n\t\tSyncUpdateType.COMPACTION\n\t);\n}\n\n/**\n * Create sync step 1 update (announce our state vector).\n *\n * @param doc The Yjs document\n */\nfunction createSyncStep1Update( doc: Y.Doc ): SyncUpdate {\n\tconst encoder = encoding.createEncoder();\n\tsyncProtocol.writeSyncStep1( encoder, doc );\n\treturn createSyncUpdate(\n\t\tencoding.toUint8Array( encoder ),\n\t\tSyncUpdateType.SYNC_STEP_1\n\t);\n}\n\n/**\n * Create sync step 2 update (acknowledge sync step 1).\n *\n * @param doc   The Yjs document\n * @param step1 The sync step 1 update received\n */\nfunction createSyncStep2Update( doc: Y.Doc, step1: Uint8Array ): SyncUpdate {\n\tconst decoder = decoding.createDecoder( step1 );\n\tconst encoder = encoding.createEncoder();\n\tsyncProtocol.readSyncMessage(\n\t\tdecoder,\n\t\tencoder,\n\t\tdoc,\n\t\tPOLLING_MANAGER_ORIGIN\n\t);\n\treturn createSyncUpdate(\n\t\tencoding.toUint8Array( encoder ),\n\t\tSyncUpdateType.SYNC_STEP_2\n\t);\n}\n\n/**\n * Process an incoming awareness update from the server.\n *\n * @param state     The awareness state received\n * @param awareness The local Awareness instance\n */\nfunction processAwarenessUpdate(\n\tstate: AwarenessState,\n\tawareness: Awareness\n): void {\n\tconst currentStates = awareness.getStates();\n\tconst added = new Set< number >();\n\tconst updated = new Set< number >();\n\n\t// Removed clients are missing from the server state.\n\tconst removed = new Set< number >(\n\t\tcurrentStates.keys().filter( ( clientId ) => ! state[ clientId ] )\n\t);\n\n\tObject.entries( state ).forEach( ( [ clientIdString, awarenessState ] ) => {\n\t\tconst clientId = Number( clientIdString );\n\n\t\t// Skip our own state (we already have it locally).\n\t\tif ( clientId === awareness.clientID ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// A null state should be removed by the server, but handle it here just in case.\n\t\tif ( null === awarenessState ) {\n\t\t\tcurrentStates.delete( clientId );\n\t\t\tremoved.add( clientId );\n\t\t\treturn;\n\t\t}\n\n\t\tif ( ! currentStates.has( clientId ) ) {\n\t\t\tcurrentStates.set( clientId, awarenessState );\n\t\t\tadded.add( clientId );\n\t\t\treturn;\n\t\t}\n\n\t\tconst currentState = currentStates.get( clientId );\n\n\t\tif (\n\t\t\tJSON.stringify( currentState ) !== JSON.stringify( awarenessState )\n\t\t) {\n\t\t\tcurrentStates.set( clientId, awarenessState );\n\t\t\tupdated.add( clientId );\n\t\t}\n\t} );\n\n\tif ( added.size + updated.size > 0 ) {\n\t\tawareness.emit( 'change', [\n\t\t\t{\n\t\t\t\tadded: Array.from( added ),\n\t\t\t\tupdated: Array.from( updated ),\n\t\t\t\t// Left blank on purpose, as the removal of clients is handled in the if condition below.\n\t\t\t\tremoved: [],\n\t\t\t},\n\t\t] );\n\t}\n\n\tif ( removed.size > 0 ) {\n\t\tremoveAwarenessStates(\n\t\t\tawareness,\n\t\t\tArray.from( removed ),\n\t\t\tPOLLING_MANAGER_ORIGIN\n\t\t);\n\t}\n}\n\n/**\n * Process an incoming sync / document update based on its type.\n *\n * @param update The typed update received\n * @param doc    The Yjs document\n * @param onSync Callback when sync is complete\n * @return A response update if needed (e.g., sync_step2 in response to sync_step1)\n */\nfunction processDocUpdate(\n\tupdate: SyncUpdate,\n\tdoc: Y.Doc,\n\tonSync: () => void\n): SyncUpdate | void {\n\tconst data = base64ToUint8Array( update.data );\n\n\tswitch ( update.type ) {\n\t\tcase SyncUpdateType.SYNC_STEP_1: {\n\t\t\t// Respond to sync step 1 with sync step 2.\n\t\t\treturn createSyncStep2Update( doc, data );\n\t\t}\n\n\t\tcase SyncUpdateType.SYNC_STEP_2: {\n\t\t\t// Apply sync step 2 (potentially contains missing updates).\n\t\t\tconst decoder = decoding.createDecoder( data );\n\t\t\tconst encoder = encoding.createEncoder();\n\t\t\tsyncProtocol.readSyncMessage(\n\t\t\t\tdecoder,\n\t\t\t\tencoder,\n\t\t\t\tdoc,\n\t\t\t\tPOLLING_MANAGER_ORIGIN\n\t\t\t);\n\t\t\tonSync();\n\t\t\treturn;\n\t\t}\n\n\t\tcase SyncUpdateType.COMPACTION:\n\t\tcase SyncUpdateType.UPDATE: {\n\t\t\t// Apply document update directly.\n\t\t\tY.applyUpdate( doc, data, POLLING_MANAGER_ORIGIN );\n\t\t}\n\t}\n}\n\nlet areListenersRegistered = false;\nlet hasCollaborators = false;\nlet isActiveBrowser = 'visible' === document.visibilityState;\nlet isPolling = false;\nlet isUnloadPending = false;\nlet pollInterval = POLLING_INTERVAL_IN_MS;\nlet pollingTimeoutId: ReturnType< typeof setTimeout > | null = null;\n\n/**\n * Mark that a page unload has been requested. This fires on\n * `beforeunload` which happens before the browser aborts in-flight\n * fetches, allowing us to distinguish poll failures caused by\n * navigation from genuine server errors in the catch block.\n *\n * If the user cancels the unload (e.g. by dismissing a \"Save Changes?\" dialog),\n * the flag is reset at the start of the next poll cycle so that polling can\n * resume.\n */\nfunction handleBeforeUnload(): void {\n\tisUnloadPending = true;\n}\n\n/**\n * Send a disconnect signal for all registered rooms when the page is\n * being unloaded. Uses `sendBeacon` so the request survives navigation.\n */\nfunction handlePageHide(): void {\n\tconst rooms = Array.from( roomStates.entries() ).map(\n\t\t( [ room, state ] ) => ( {\n\t\t\tafter: 0,\n\t\t\tawareness: null,\n\t\t\tclient_id: state.clientId,\n\t\t\troom,\n\t\t\tupdates: [],\n\t\t} )\n\t);\n\n\tpostSyncUpdateNonBlocking( { rooms } );\n}\n\n/**\n * Hangle change in visibility state of browser tab.\n *\n * Used to trigger a slow down of the collaboration syncs when the\n * browser tab becomes inactive (either the user switches tabs or the\n * screen saver comes on).\n *\n * Fires on the document's visibilitychange event.\n */\nfunction handleVisibilityChange() {\n\tconst wasActive = isActiveBrowser;\n\tisActiveBrowser = document.visibilityState === 'visible';\n\n\tif ( isActiveBrowser && ! wasActive ) {\n\t\t/*\n\t\t * Remove scheduled polling and repoll immediately when reactivated.\n\t\t *\n\t\t * This ensures that any updates by collaborators are immediately reflected\n\t\t * in the document once the browser tab becomes active. Otherwise there would\n\t\t * be a delay of 30 seconds before the updates came through.\n\t\t */\n\t\tif ( pollingTimeoutId ) {\n\t\t\tclearTimeout( pollingTimeoutId );\n\t\t\tpollingTimeoutId = null;\n\t\t}\n\n\t\tif ( isPolling ) {\n\t\t\tpoll();\n\t\t}\n\t}\n}\n\nfunction poll(): void {\n\tisPolling = true;\n\n\tasync function start(): Promise< void > {\n\t\tif ( 0 === roomStates.size ) {\n\t\t\tisPolling = false;\n\t\t\treturn;\n\t\t}\n\n\t\t// Reset the unloading flag at the start of each poll cycle so\n\t\t// it doesn't permanently suppress disconnect after the user\n\t\t// cancels a beforeunload dialog.\n\t\tisUnloadPending = false;\n\n\t\t// Emit 'connecting' status.\n\t\troomStates.forEach( ( state ) => {\n\t\t\tstate.onStatusChange( { status: 'connecting' } );\n\t\t} );\n\n\t\t// Create a payload with all queued updates. We include rooms even if they\n\t\t// have no updates to ensure we receive any incoming updates. Note that we\n\t\t// withhold our own updates until we detect another collaborator using the\n\t\t// queue's pause / resume mechanism.\n\t\tconst payload: SyncPayload = {\n\t\t\trooms: Array.from( roomStates.entries() ).map(\n\t\t\t\t( [ room, state ] ) => ( {\n\t\t\t\t\tafter: state.endCursor ?? 0,\n\t\t\t\t\tawareness: state.localAwarenessState,\n\t\t\t\t\tclient_id: state.clientId,\n\t\t\t\t\troom,\n\t\t\t\t\tupdates: state.updateQueue.get(),\n\t\t\t\t} )\n\t\t\t),\n\t\t};\n\n\t\ttry {\n\t\t\tconst { rooms } = await postSyncUpdate( payload );\n\n\t\t\t// Emit 'connected' status.\n\t\t\troomStates.forEach( ( state ) => {\n\t\t\t\tstate.onStatusChange( { status: 'connected' } );\n\t\t\t} );\n\n\t\t\trooms.forEach( ( room ) => {\n\t\t\t\tif ( ! roomStates.has( room.room ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tconst roomState = roomStates.get( room.room )!;\n\t\t\t\troomState.endCursor = room.end_cursor;\n\n\t\t\t\t// Process awareness update.\n\t\t\t\troomState.processAwarenessUpdate( room.awareness );\n\n\t\t\t\t// If there is another collaborator, resume the queue for the next poll\n\t\t\t\t// and increase polling frequency.\n\t\t\t\tif ( Object.keys( room.awareness ).length > 1 ) {\n\t\t\t\t\thasCollaborators = true;\n\t\t\t\t\troomState.updateQueue.resume();\n\t\t\t\t}\n\n\t\t\t\t// Process each incoming update and collect any responses.\n\t\t\t\tconst responseUpdates = room.updates\n\t\t\t\t\t.map( ( update ) => roomState.processDocUpdate( update ) )\n\t\t\t\t\t.filter( ( update ): update is SyncUpdate =>\n\t\t\t\t\t\tBoolean( update )\n\t\t\t\t\t);\n\t\t\t\troomState.updateQueue.addBulk( responseUpdates );\n\n\t\t\t\t// Respond to compaction requests from server. The server asks only one\n\t\t\t\t// client at a time to compact (lowest active client ID). We encode our\n\t\t\t\t// full document state to replace all prior updates on the server.\n\t\t\t\tif ( room.should_compact ) {\n\t\t\t\t\troomState.log( 'Server requested compaction update' );\n\t\t\t\t\troomState.updateQueue.clear();\n\t\t\t\t\troomState.updateQueue.add(\n\t\t\t\t\t\troomState.createCompactionUpdate()\n\t\t\t\t\t);\n\t\t\t\t} else if ( room.compaction_request ) {\n\t\t\t\t\t// Deprecated\n\t\t\t\t\troomState.log( 'Server requested (old) compaction update' );\n\t\t\t\t\troomState.updateQueue.add(\n\t\t\t\t\t\tcreateDeprecatedCompactionUpdate(\n\t\t\t\t\t\t\troom.compaction_request\n\t\t\t\t\t\t)\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\t// Recalculate polling interval.\n\t\t\tif ( isActiveBrowser && hasCollaborators ) {\n\t\t\t\tpollInterval = POLLING_INTERVAL_WITH_COLLABORATORS_IN_MS;\n\t\t\t} else if ( isActiveBrowser ) {\n\t\t\t\tpollInterval = POLLING_INTERVAL_IN_MS;\n\t\t\t} else {\n\t\t\t\tpollInterval = POLLING_INTERVAL_BACKGROUND_TAB_IN_MS;\n\t\t\t}\n\t\t} catch ( error ) {\n\t\t\t// Exponential backoff on error: double the backoff time, up to max\n\t\t\tpollInterval = Math.min(\n\t\t\t\tpollInterval * 2,\n\t\t\t\tMAX_ERROR_BACKOFF_IN_MS\n\t\t\t);\n\n\t\t\t// Restore updates to queues on failure so they can be retried.\n\t\t\tfor ( const room of payload.rooms ) {\n\t\t\t\tif ( ! roomStates.has( room.room ) ) {\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\n\t\t\t\tconst state = roomStates.get( room.room )!;\n\t\t\t\tstate.updateQueue.restore( room.updates );\n\t\t\t\tstate.log(\n\t\t\t\t\t'Error posting sync update, will retry with backoff',\n\t\t\t\t\t{\n\t\t\t\t\t\terror,\n\t\t\t\t\t\tnextPoll: pollInterval,\n\t\t\t\t\t}\n\t\t\t\t);\n\t\t\t}\n\n\t\t\t// Don't report disconnected status when the request was aborted\n\t\t\t// due to page unload (e.g. during a refresh) to avoid briefly\n\t\t\t// flashing the disconnect dialog before the new page loads.\n\t\t\tif ( ! isUnloadPending ) {\n\t\t\t\troomStates.forEach( ( state ) => {\n\t\t\t\t\tstate.onStatusChange( { status: 'disconnected' } );\n\t\t\t\t} );\n\t\t\t}\n\t\t}\n\n\t\tpollingTimeoutId = setTimeout( poll, pollInterval );\n\t}\n\n\t// Start polling.\n\tvoid start();\n}\nfunction registerRoom( {\n\troom,\n\tdoc,\n\tawareness,\n\tlog,\n\tonSync,\n\tonStatusChange,\n}: RegisterRoomOptions ): void {\n\tif ( roomStates.has( room ) ) {\n\t\treturn;\n\t}\n\n\t// Note: Queue is initially paused. Call .resume() to unpause.\n\tconst updateQueue = createUpdateQueue( [ createSyncStep1Update( doc ) ] );\n\n\tfunction onAwarenessUpdate(): void {\n\t\troomState.localAwarenessState = awareness.getLocalState() ?? {};\n\t}\n\n\tfunction onDocUpdate( update: Uint8Array, origin: unknown ): void {\n\t\tif ( POLLING_MANAGER_ORIGIN === origin ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Tag local document changes as 'update' type.\n\t\tupdateQueue.add( createSyncUpdate( update, SyncUpdateType.UPDATE ) );\n\t}\n\n\tfunction unregister(): void {\n\t\tdoc.off( 'update', onDocUpdate );\n\t\tawareness.off( 'change', onAwarenessUpdate );\n\t\tupdateQueue.clear();\n\t}\n\n\tconst roomState: RoomState = {\n\t\tclientId: doc.clientID,\n\t\tcreateCompactionUpdate: () =>\n\t\t\tcreateSyncUpdate(\n\t\t\t\tY.encodeStateAsUpdate( doc ),\n\t\t\t\tSyncUpdateType.COMPACTION\n\t\t\t),\n\t\tendCursor: 0,\n\t\tlocalAwarenessState: awareness.getLocalState() ?? {},\n\t\tlog,\n\t\tonStatusChange,\n\t\tprocessAwarenessUpdate: ( state: AwarenessState ) =>\n\t\t\tprocessAwarenessUpdate( state, awareness ),\n\t\tprocessDocUpdate: ( update: SyncUpdate ) =>\n\t\t\tprocessDocUpdate( update, doc, onSync ),\n\t\tunregister,\n\t\tupdateQueue,\n\t};\n\n\tdoc.on( 'update', onDocUpdate );\n\tawareness.on( 'change', onAwarenessUpdate );\n\troomStates.set( room, roomState );\n\n\tif ( ! areListenersRegistered ) {\n\t\twindow.addEventListener( 'beforeunload', handleBeforeUnload );\n\t\twindow.addEventListener( 'pagehide', handlePageHide );\n\t\tdocument.addEventListener( 'visibilitychange', handleVisibilityChange );\n\t\tareListenersRegistered = true;\n\t}\n\n\tif ( ! isPolling ) {\n\t\tpoll();\n\t}\n}\n\nfunction unregisterRoom( room: string ): void {\n\tconst state = roomStates.get( room );\n\tif ( state ) {\n\t\t// Send a disconnect signal so the server removes this client's\n\t\t// awareness entry immediately instead of waiting for the timeout.\n\t\tconst rooms = [\n\t\t\t{\n\t\t\t\tafter: 0,\n\t\t\t\tawareness: null,\n\t\t\t\tclient_id: state.clientId,\n\t\t\t\troom,\n\t\t\t\tupdates: [],\n\t\t\t},\n\t\t];\n\n\t\tpostSyncUpdateNonBlocking( { rooms } );\n\t\tstate.unregister();\n\t\troomStates.delete( room );\n\t}\n\n\tif ( 0 === roomStates.size && areListenersRegistered ) {\n\t\twindow.removeEventListener( 'beforeunload', handleBeforeUnload );\n\t\twindow.removeEventListener( 'pagehide', handlePageHide );\n\t\tdocument.removeEventListener(\n\t\t\t'visibilitychange',\n\t\t\thandleVisibilityChange\n\t\t);\n\t\tareListenersRegistered = false;\n\t}\n}\n\nexport const pollingManager: PollingManager = {\n\tregisterRoom,\n\tunregisterRoom,\n};\n"],
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state[ clientId ] )\n\t);\n\n\tObject.entries( state ).forEach( ( [ clientIdString, awarenessState ] ) => {\n\t\tconst clientId = Number( clientIdString );\n\n\t\t// Skip our own state (we already have it locally).\n\t\tif ( clientId === awareness.clientID ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// A null state should be removed by the server, but handle it here just in case.\n\t\tif ( null === awarenessState ) {\n\t\t\tcurrentStates.delete( clientId );\n\t\t\tremoved.add( clientId );\n\t\t\treturn;\n\t\t}\n\n\t\tif ( ! currentStates.has( clientId ) ) {\n\t\t\tcurrentStates.set( clientId, awarenessState );\n\t\t\tadded.add( clientId );\n\t\t\treturn;\n\t\t}\n\n\t\tconst currentState = currentStates.get( clientId );\n\n\t\tif (\n\t\t\tJSON.stringify( currentState ) !== JSON.stringify( awarenessState )\n\t\t) {\n\t\t\tcurrentStates.set( clientId, awarenessState );\n\t\t\tupdated.add( clientId );\n\t\t}\n\t} );\n\n\tif ( added.size + updated.size > 0 ) {\n\t\tawareness.emit( 'change', [\n\t\t\t{\n\t\t\t\tadded: Array.from( added ),\n\t\t\t\tupdated: Array.from( updated ),\n\t\t\t\t// Left blank on purpose, as the removal of clients is handled in the if condition below.\n\t\t\t\tremoved: [],\n\t\t\t},\n\t\t] );\n\t}\n\n\tif ( removed.size > 0 ) {\n\t\tremoveAwarenessStates(\n\t\t\tawareness,\n\t\t\tArray.from( removed ),\n\t\t\tPOLLING_MANAGER_ORIGIN\n\t\t);\n\t}\n}\n\n/**\n * Process an incoming sync / document update based on its type.\n *\n * @param update The typed update received\n * @param doc    The Yjs document\n * @param onSync Callback when sync is complete\n * @return A response update if needed (e.g., sync_step2 in response to sync_step1)\n */\nfunction processDocUpdate(\n\tupdate: SyncUpdate,\n\tdoc: Y.Doc,\n\tonSync: () => void\n): SyncUpdate | void {\n\tconst data = base64ToUint8Array( update.data );\n\n\tswitch ( update.type ) {\n\t\tcase SyncUpdateType.SYNC_STEP_1: {\n\t\t\t// Respond to sync step 1 with sync step 2.\n\t\t\treturn createSyncStep2Update( doc, data );\n\t\t}\n\n\t\tcase SyncUpdateType.SYNC_STEP_2: {\n\t\t\t// Apply sync step 2 (potentially contains missing updates).\n\t\t\tconst decoder = decoding.createDecoder( data );\n\t\t\tconst encoder = encoding.createEncoder();\n\t\t\tsyncProtocol.readSyncMessage(\n\t\t\t\tdecoder,\n\t\t\t\tencoder,\n\t\t\t\tdoc,\n\t\t\t\tPOLLING_MANAGER_ORIGIN\n\t\t\t);\n\t\t\tonSync();\n\t\t\treturn;\n\t\t}\n\n\t\tcase SyncUpdateType.COMPACTION:\n\t\tcase SyncUpdateType.UPDATE: {\n\t\t\t// Apply document update directly.\n\t\t\tY.applyUpdate( doc, data, POLLING_MANAGER_ORIGIN );\n\t\t}\n\t}\n}\n\nlet areListenersRegistered = false;\nlet hasCollaborators = false;\nlet isActiveBrowser = 'visible' === document.visibilityState;\nlet isPolling = false;\nlet isUnloadPending = false;\nlet pollInterval = POLLING_INTERVAL_IN_MS;\nlet pollingTimeoutId: ReturnType< typeof setTimeout > | null = null;\n\n/**\n * Mark that a page unload has been requested. This fires on\n * `beforeunload` which happens before the browser aborts in-flight\n * fetches, allowing us to distinguish poll failures caused by\n * navigation from genuine server errors in the catch block.\n *\n * If the user cancels the unload (e.g. by dismissing a \"Save Changes?\" dialog),\n * the flag is reset at the start of the next poll cycle so that polling can\n * resume.\n */\nfunction handleBeforeUnload(): void {\n\tisUnloadPending = true;\n}\n\n/**\n * Send a disconnect signal for all registered rooms when the page is\n * being unloaded. Uses `sendBeacon` so the request survives navigation.\n */\nfunction handlePageHide(): void {\n\tconst rooms = Array.from( roomStates.entries() ).map(\n\t\t( [ room, state ] ) => ( {\n\t\t\tafter: 0,\n\t\t\tawareness: null,\n\t\t\tclient_id: state.clientId,\n\t\t\troom,\n\t\t\tupdates: [],\n\t\t} )\n\t);\n\n\tpostSyncUpdateNonBlocking( { rooms } );\n}\n\n/**\n * Hangle change in visibility state of browser tab.\n *\n * Used to trigger a slow down of the collaboration syncs when the\n * browser tab becomes inactive (either the user switches tabs or the\n * screen saver comes on).\n *\n * Fires on the document's visibilitychange event.\n */\nfunction handleVisibilityChange() {\n\tconst wasActive = isActiveBrowser;\n\tisActiveBrowser = document.visibilityState === 'visible';\n\n\tif ( isActiveBrowser && ! wasActive ) {\n\t\t/*\n\t\t * Remove scheduled polling and repoll immediately when reactivated.\n\t\t *\n\t\t * This ensures that any updates by collaborators are immediately\n\t\t * reflected in the document once the browser tab becomes active.\n\t\t * Otherwise there would be a delay of up to 30 seconds before the\n\t\t * updates came through.\n\t\t *\n\t\t * Only repoll if we cleared a pending timeout, meaning the poll loop\n\t\t * was idle between cycles. If no timeout is pending, a poll request\n\t\t * is already in-flight and will pick up the updated isActiveBrowser\n\t\t * value when it schedules the next cycle.\n\t\t */\n\t\tif ( pollingTimeoutId ) {\n\t\t\tclearTimeout( pollingTimeoutId );\n\t\t\tpollingTimeoutId = null;\n\t\t\tpoll();\n\t\t}\n\t}\n}\n\nfunction poll(): void {\n\tisPolling = true;\n\tpollingTimeoutId = null;\n\n\tasync function start(): Promise< void > {\n\t\tif ( 0 === roomStates.size ) {\n\t\t\tisPolling = false;\n\t\t\treturn;\n\t\t}\n\n\t\t// Reset the unloading flag at the start of each poll cycle so\n\t\t// it doesn't permanently suppress disconnect after the user\n\t\t// cancels a beforeunload dialog.\n\t\tisUnloadPending = false;\n\n\t\t// Emit 'connecting' status.\n\t\troomStates.forEach( ( state ) => {\n\t\t\tstate.onStatusChange( { status: 'connecting' } );\n\t\t} );\n\n\t\t// Create a payload with all queued updates. We include rooms even if they\n\t\t// have no updates to ensure we receive any incoming updates. Note that we\n\t\t// withhold our own updates until we detect another collaborator using the\n\t\t// queue's pause / resume mechanism.\n\t\tconst payload: SyncPayload = {\n\t\t\trooms: Array.from( roomStates.entries() ).map(\n\t\t\t\t( [ room, state ] ) => ( {\n\t\t\t\t\tafter: state.endCursor ?? 0,\n\t\t\t\t\tawareness: state.localAwarenessState,\n\t\t\t\t\tclient_id: state.clientId,\n\t\t\t\t\troom,\n\t\t\t\t\tupdates: state.updateQueue.get(),\n\t\t\t\t} )\n\t\t\t),\n\t\t};\n\n\t\ttry {\n\t\t\tconst { rooms } = await postSyncUpdate( payload );\n\n\t\t\t// Emit 'connected' status.\n\t\t\troomStates.forEach( ( state ) => {\n\t\t\t\tstate.onStatusChange( { status: 'connected' } );\n\t\t\t} );\n\n\t\t\trooms.forEach( ( room ) => {\n\t\t\t\tif ( ! roomStates.has( room.room ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tconst roomState = roomStates.get( room.room )!;\n\t\t\t\troomState.endCursor = room.end_cursor;\n\n\t\t\t\t// Process awareness update.\n\t\t\t\troomState.processAwarenessUpdate( room.awareness );\n\n\t\t\t\t// If there is another collaborator, resume the queue for the next poll\n\t\t\t\t// and increase polling frequency.\n\t\t\t\tif ( Object.keys( room.awareness ).length > 1 ) {\n\t\t\t\t\thasCollaborators = true;\n\t\t\t\t\troomState.updateQueue.resume();\n\t\t\t\t}\n\n\t\t\t\t// Process each incoming update and collect any responses.\n\t\t\t\tconst responseUpdates = room.updates\n\t\t\t\t\t.map( ( update ) => roomState.processDocUpdate( update ) )\n\t\t\t\t\t.filter( ( update ): update is SyncUpdate =>\n\t\t\t\t\t\tBoolean( update )\n\t\t\t\t\t);\n\t\t\t\troomState.updateQueue.addBulk( responseUpdates );\n\n\t\t\t\t// Respond to compaction requests from server. The server asks only one\n\t\t\t\t// client at a time to compact (lowest active client ID). We encode our\n\t\t\t\t// full document state to replace all prior updates on the server.\n\t\t\t\tif ( room.should_compact ) {\n\t\t\t\t\troomState.log( 'Server requested compaction update' );\n\t\t\t\t\troomState.updateQueue.clear();\n\t\t\t\t\troomState.updateQueue.add(\n\t\t\t\t\t\troomState.createCompactionUpdate()\n\t\t\t\t\t);\n\t\t\t\t} else if ( room.compaction_request ) {\n\t\t\t\t\t// Deprecated\n\t\t\t\t\troomState.log( 'Server requested (old) compaction update' );\n\t\t\t\t\troomState.updateQueue.add(\n\t\t\t\t\t\tcreateDeprecatedCompactionUpdate(\n\t\t\t\t\t\t\troom.compaction_request\n\t\t\t\t\t\t)\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\t// Recalculate polling interval.\n\t\t\tif ( isActiveBrowser && hasCollaborators ) {\n\t\t\t\tpollInterval = POLLING_INTERVAL_WITH_COLLABORATORS_IN_MS;\n\t\t\t} else if ( isActiveBrowser ) {\n\t\t\t\tpollInterval = POLLING_INTERVAL_IN_MS;\n\t\t\t} else {\n\t\t\t\tpollInterval = POLLING_INTERVAL_BACKGROUND_TAB_IN_MS;\n\t\t\t}\n\t\t} catch ( error ) {\n\t\t\t// Exponential backoff on error: double the backoff time, up to max\n\t\t\tpollInterval = Math.min(\n\t\t\t\tpollInterval * 2,\n\t\t\t\tMAX_ERROR_BACKOFF_IN_MS\n\t\t\t);\n\n\t\t\t// Restore updates to queues on failure so they can be retried.\n\t\t\tfor ( const room of payload.rooms ) {\n\t\t\t\tif ( ! roomStates.has( room.room ) ) {\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\n\t\t\t\tconst state = roomStates.get( room.room )!;\n\t\t\t\tstate.updateQueue.restore( room.updates );\n\t\t\t\tstate.log(\n\t\t\t\t\t'Error posting sync update, will retry with backoff',\n\t\t\t\t\t{\n\t\t\t\t\t\terror,\n\t\t\t\t\t\tnextPoll: pollInterval,\n\t\t\t\t\t}\n\t\t\t\t);\n\t\t\t}\n\n\t\t\t// Don't report disconnected status when the request was aborted\n\t\t\t// due to page unload (e.g. during a refresh) to avoid briefly\n\t\t\t// flashing the disconnect dialog before the new page loads.\n\t\t\tif ( ! isUnloadPending ) {\n\t\t\t\troomStates.forEach( ( state ) => {\n\t\t\t\t\tstate.onStatusChange( {\n\t\t\t\t\t\tstatus: 'disconnected',\n\t\t\t\t\t\tretryInMs: pollInterval,\n\t\t\t\t\t} );\n\t\t\t\t} );\n\t\t\t}\n\t\t}\n\n\t\tpollingTimeoutId = setTimeout( poll, pollInterval );\n\t}\n\n\t// Start polling.\n\tvoid start();\n}\nfunction registerRoom( {\n\troom,\n\tdoc,\n\tawareness,\n\tlog,\n\tonSync,\n\tonStatusChange,\n}: RegisterRoomOptions ): void {\n\tif ( roomStates.has( room ) ) {\n\t\treturn;\n\t}\n\n\t// Note: Queue is initially paused. Call .resume() to unpause.\n\tconst updateQueue = createUpdateQueue( [ createSyncStep1Update( doc ) ] );\n\n\tfunction onAwarenessUpdate(): void {\n\t\troomState.localAwarenessState = awareness.getLocalState() ?? {};\n\t}\n\n\tfunction onDocUpdate( update: Uint8Array, origin: unknown ): void {\n\t\tif ( POLLING_MANAGER_ORIGIN === origin ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Tag local document changes as 'update' type.\n\t\tupdateQueue.add( createSyncUpdate( update, SyncUpdateType.UPDATE ) );\n\t}\n\n\tfunction unregister(): void {\n\t\tdoc.off( 'update', onDocUpdate );\n\t\tawareness.off( 'change', onAwarenessUpdate );\n\t\tupdateQueue.clear();\n\t}\n\n\tconst roomState: RoomState = {\n\t\tclientId: doc.clientID,\n\t\tcreateCompactionUpdate: () =>\n\t\t\tcreateSyncUpdate(\n\t\t\t\tY.encodeStateAsUpdate( doc ),\n\t\t\t\tSyncUpdateType.COMPACTION\n\t\t\t),\n\t\tendCursor: 0,\n\t\tlocalAwarenessState: awareness.getLocalState() ?? {},\n\t\tlog,\n\t\tonStatusChange,\n\t\tprocessAwarenessUpdate: ( state: AwarenessState ) =>\n\t\t\tprocessAwarenessUpdate( state, awareness ),\n\t\tprocessDocUpdate: ( update: SyncUpdate ) =>\n\t\t\tprocessDocUpdate( update, doc, onSync ),\n\t\tunregister,\n\t\tupdateQueue,\n\t};\n\n\tdoc.on( 'update', onDocUpdate );\n\tawareness.on( 'change', onAwarenessUpdate );\n\troomStates.set( room, roomState );\n\n\tif ( ! areListenersRegistered ) {\n\t\twindow.addEventListener( 'beforeunload', handleBeforeUnload );\n\t\twindow.addEventListener( 'pagehide', handlePageHide );\n\t\tdocument.addEventListener( 'visibilitychange', handleVisibilityChange );\n\t\tareListenersRegistered = true;\n\t}\n\n\tif ( ! isPolling ) {\n\t\tpoll();\n\t}\n}\n\nfunction unregisterRoom( room: string ): void {\n\tconst state = roomStates.get( room );\n\tif ( state ) {\n\t\t// Send a disconnect signal so the server removes this client's\n\t\t// awareness entry immediately instead of waiting for the timeout.\n\t\tconst rooms = [\n\t\t\t{\n\t\t\t\tafter: 0,\n\t\t\t\tawareness: null,\n\t\t\t\tclient_id: state.clientId,\n\t\t\t\troom,\n\t\t\t\tupdates: [],\n\t\t\t},\n\t\t];\n\n\t\tpostSyncUpdateNonBlocking( { rooms } );\n\t\tstate.unregister();\n\t\troomStates.delete( room );\n\t}\n\n\tif ( 0 === roomStates.size && areListenersRegistered ) {\n\t\twindow.removeEventListener( 'beforeunload', handleBeforeUnload );\n\t\twindow.removeEventListener( 'pagehide', handlePageHide );\n\t\tdocument.removeEventListener(\n\t\t\t'visibilitychange',\n\t\t\thandleVisibilityChange\n\t\t);\n\t\tareListenersRegistered = false;\n\t}\n}\n\n/**\n * Immediately retry the sync connection by cancelling any pending backoff\n * timeout and triggering a new poll. If a request is already in-flight,\n * the backoff interval is reset so the next scheduled poll fires sooner.\n */\nfunction retryNow(): void {\n\tpollInterval = POLLING_INTERVAL_IN_MS * 2;\n\n\tif ( pollingTimeoutId ) {\n\t\tclearTimeout( pollingTimeoutId );\n\t\tpollingTimeoutId = null;\n\t\tpoll();\n\t}\n}\n\nexport const pollingManager: PollingManager = {\n\tregisterRoom,\n\tretryNow,\n\tunregisterRoom,\n};\n"],
+  "mappings": 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   "names": []
 }

build/quill-delta/Delta.cjs

@@ -48,2 +48,8 @@ "use strict";
 var NULL_CHARACTER = String.fromCharCode(0);
+function normalizeChangeCounts(changes) {
+  return changes.map((change) => ({
+    ...change,
+    count: change.value.length
+  }));
+}
 var getEmbedTypeAndData = (a, b) => {
@@ -310,3 +316,5 @@ if (typeof a !== "object" || a === null) {
     const strings = this.deltasToStrings(other);
-    const diffResult = (0, import_diff.diffChars)(strings[0], strings[1]);
+    const diffResult = normalizeChangeCounts(
+      (0, import_diff.diffChars)(strings[0], strings[1])
+    );
     const thisIter = new import_OpIterator.default(this.ops);
@@ -481,3 +489,5 @@ const otherIter = new import_OpIterator.default(other.ops);
     const strings = this.deltasToStrings(other);
-    let diffs = (0, import_diff.diffChars)(strings[0], strings[1]);
+    let diffs = normalizeChangeCounts(
+      (0, import_diff.diffChars)(strings[0], strings[1])
+    );
     let lastDiffPosition = 0;
@@ -484,0 +494,0 @@ const adjustedDiffs = [];

build/quill-delta/Delta.cjs.map

 {
   "version": 3,
   "sources": ["../../src/quill-delta/Delta.ts"],
-  "sourcesContent": ["// File copied https://github.com/slab/delta/blob/main/src/Delta.ts with changes:\n// - fast-diff swapped out for 'diff',\n// - lodash.clonedeep is replaced with JSON parse / stringify\n// - lodash.isequal is replaced with fast-deep-equal.\n\n// @ts-ignore\n/**\n * External dependencies\n */\nimport type { Change } from 'diff';\nimport { diffChars } from 'diff';\nimport { default as isEqual } from 'fast-deep-equal/es6';\n\n/**\n * Internal dependencies\n */\nimport AttributeMap from './AttributeMap';\nimport Op from './Op';\nimport OpIterator from './OpIterator';\n\nfunction cloneDeep< T >( value: T ): T {\n\treturn JSON.parse( JSON.stringify( value ) ) as T;\n}\n\nconst NULL_CHARACTER = String.fromCharCode( 0 ); // Placeholder char for embed in diff()\n\ninterface EmbedHandler< T > {\n\tcompose: ( a: T, b: T, keepNull: boolean ) => T;\n\tinvert: ( a: T, b: T ) => T;\n\ttransform: ( a: T, b: T, priority: boolean ) => T;\n}\n\nconst getEmbedTypeAndData = (\n\ta: Op[ 'insert' ] | Op[ 'retain' ],\n\tb: Op[ 'insert' ]\n): [ string, unknown, unknown ] => {\n\tif ( typeof a !== 'object' || a === null ) {\n\t\tthrow new Error( `cannot retain a ${ typeof a }` );\n\t}\n\tif ( typeof b !== 'object' || b === null ) {\n\t\tthrow new Error( `cannot retain a ${ typeof b }` );\n\t}\n\tconst embedType = Object.keys( a )[ 0 ];\n\tif ( ! embedType || embedType !== Object.keys( b )[ 0 ] ) {\n\t\tthrow new Error(\n\t\t\t`embed types not matched: ${ embedType } != ${\n\t\t\t\tObject.keys( b )[ 0 ]\n\t\t\t}`\n\t\t);\n\t}\n\treturn [ embedType, a[ embedType ], b[ embedType ] ];\n};\n\nclass Delta {\n\tstatic Op = Op;\n\tstatic OpIterator = OpIterator;\n\tstatic AttributeMap = AttributeMap;\n\tprivate static handlers: {\n\t\t[ embedType: string ]: EmbedHandler< unknown >;\n\t} = {};\n\n\tstatic registerEmbed< T >(\n\t\tembedType: string,\n\t\thandler: EmbedHandler< T >\n\t): void {\n\t\tthis.handlers[ embedType ] = handler as EmbedHandler< unknown >;\n\t}\n\n\tstatic unregisterEmbed( embedType: string ): void {\n\t\tdelete this.handlers[ embedType ];\n\t}\n\n\tprivate static getHandler( embedType: string ): EmbedHandler< unknown > {\n\t\tconst handler = this.handlers[ embedType ];\n\t\tif ( ! handler ) {\n\t\t\tthrow new Error( `no handlers for embed type \"${ embedType }\"` );\n\t\t}\n\t\treturn handler;\n\t}\n\n\tops: Op[];\n\tconstructor( ops?: Op[] | { ops: Op[] } ) {\n\t\t// Assume we are given a well formed ops\n\t\tif ( Array.isArray( ops ) ) {\n\t\t\tthis.ops = ops;\n\t\t} else if (\n\t\t\tops !== null &&\n\t\t\tops !== undefined &&\n\t\t\tArray.isArray( ops.ops )\n\t\t) {\n\t\t\tthis.ops = ops.ops;\n\t\t} else {\n\t\t\tthis.ops = [];\n\t\t}\n\t}\n\n\tinsert(\n\t\targ: string | Record< string, unknown >,\n\t\tattributes?: AttributeMap | null\n\t): this {\n\t\tconst newOp: Op = {};\n\t\tif ( typeof arg === 'string' && arg.length === 0 ) {\n\t\t\treturn this;\n\t\t}\n\t\tnewOp.insert = arg;\n\t\tif (\n\t\t\tattributes !== null &&\n\t\t\tattributes !== undefined &&\n\t\t\ttypeof attributes === 'object' &&\n\t\t\tObject.keys( attributes ).length > 0\n\t\t) {\n\t\t\tnewOp.attributes = attributes;\n\t\t}\n\t\treturn this.push( newOp );\n\t}\n\n\tdelete( length: number ): this {\n\t\tif ( length <= 0 ) {\n\t\t\treturn this;\n\t\t}\n\t\treturn this.push( { delete: length } );\n\t}\n\n\tretain(\n\t\tlength: number | Record< string, unknown >,\n\t\tattributes?: AttributeMap | null\n\t): this {\n\t\tif ( typeof length === 'number' && length <= 0 ) {\n\t\t\treturn this;\n\t\t}\n\t\tconst newOp: Op = { retain: length };\n\t\tif (\n\t\t\tattributes !== null &&\n\t\t\tattributes !== undefined &&\n\t\t\ttypeof attributes === 'object' &&\n\t\t\tObject.keys( attributes ).length > 0\n\t\t) {\n\t\t\tnewOp.attributes = attributes;\n\t\t}\n\t\treturn this.push( newOp );\n\t}\n\n\tpush( newOp: Op ): this {\n\t\tlet index = this.ops.length;\n\t\tlet lastOp = this.ops[ index - 1 ];\n\t\tnewOp = cloneDeep( newOp );\n\t\tif ( typeof lastOp === 'object' ) {\n\t\t\tif (\n\t\t\t\ttypeof newOp.delete === 'number' &&\n\t\t\t\ttypeof lastOp.delete === 'number'\n\t\t\t) {\n\t\t\t\tthis.ops[ index - 1 ] = {\n\t\t\t\t\tdelete: lastOp.delete + newOp.delete,\n\t\t\t\t};\n\t\t\t\treturn this;\n\t\t\t}\n\t\t\t// Since it does not matter if we insert before or after deleting at the same index,\n\t\t\t// always prefer to insert first\n\t\t\tif (\n\t\t\t\ttypeof lastOp.delete === 'number' &&\n\t\t\t\tnewOp.insert !== null &&\n\t\t\t\tnewOp.insert !== undefined\n\t\t\t) {\n\t\t\t\tindex -= 1;\n\t\t\t\tlastOp = this.ops[ index - 1 ];\n\t\t\t\tif ( typeof lastOp !== 'object' ) {\n\t\t\t\t\tthis.ops.unshift( newOp );\n\t\t\t\t\treturn this;\n\t\t\t\t}\n\t\t\t}\n\t\t\tif ( isEqual( newOp.attributes, lastOp.attributes ) ) {\n\t\t\t\tif (\n\t\t\t\t\ttypeof newOp.insert === 'string' &&\n\t\t\t\t\ttypeof lastOp.insert === 'string'\n\t\t\t\t) {\n\t\t\t\t\tthis.ops[ index - 1 ] = {\n\t\t\t\t\t\tinsert: lastOp.insert + newOp.insert,\n\t\t\t\t\t};\n\t\t\t\t\tif ( typeof newOp.attributes === 'object' ) {\n\t\t\t\t\t\tthis.ops[ index - 1 ].attributes = newOp.attributes;\n\t\t\t\t\t}\n\t\t\t\t\treturn this;\n\t\t\t\t} else if (\n\t\t\t\t\ttypeof newOp.retain === 'number' &&\n\t\t\t\t\ttypeof lastOp.retain === 'number'\n\t\t\t\t) {\n\t\t\t\t\tthis.ops[ index - 1 ] = {\n\t\t\t\t\t\tretain: lastOp.retain + newOp.retain,\n\t\t\t\t\t};\n\t\t\t\t\tif ( typeof newOp.attributes === 'object' ) {\n\t\t\t\t\t\tthis.ops[ index - 1 ].attributes = newOp.attributes;\n\t\t\t\t\t}\n\t\t\t\t\treturn this;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tif ( index === this.ops.length ) {\n\t\t\tthis.ops.push( newOp );\n\t\t} else {\n\t\t\tthis.ops.splice( index, 0, newOp );\n\t\t}\n\t\treturn this;\n\t}\n\n\tchop(): this {\n\t\tconst lastOp = this.ops[ this.ops.length - 1 ];\n\t\tif (\n\t\t\tlastOp &&\n\t\t\ttypeof lastOp.retain === 'number' &&\n\t\t\t! lastOp.attributes\n\t\t) {\n\t\t\tthis.ops.pop();\n\t\t}\n\t\treturn this;\n\t}\n\n\tfilter( predicate: ( op: Op, index: number ) => boolean ): Op[] {\n\t\treturn this.ops.filter( predicate );\n\t}\n\n\tforEach( predicate: ( op: Op, index: number ) => void ): void {\n\t\tthis.ops.forEach( predicate );\n\t}\n\n\tmap< T >( predicate: ( op: Op, index: number ) => T ): T[] {\n\t\treturn this.ops.map( predicate );\n\t}\n\n\tpartition( predicate: ( op: Op ) => boolean ): [ Op[], Op[] ] {\n\t\tconst passed: Op[] = [];\n\t\tconst failed: Op[] = [];\n\t\tthis.forEach( ( op ) => {\n\t\t\tconst target = predicate( op ) ? passed : failed;\n\t\t\ttarget.push( op );\n\t\t} );\n\t\treturn [ passed, failed ];\n\t}\n\n\treduce< T >(\n\t\tpredicate: ( accum: T, curr: Op, index: number ) => T,\n\t\tinitialValue: T\n\t): T {\n\t\treturn this.ops.reduce( predicate, initialValue );\n\t}\n\n\tchangeLength(): number {\n\t\treturn this.reduce( ( length, elem ) => {\n\t\t\tif ( elem.insert ) {\n\t\t\t\treturn length + Op.length( elem );\n\t\t\t} else if ( elem.delete ) {\n\t\t\t\treturn length - elem.delete;\n\t\t\t}\n\t\t\treturn length;\n\t\t}, 0 );\n\t}\n\n\tlength(): number {\n\t\treturn this.reduce( ( length, elem ) => {\n\t\t\treturn length + Op.length( elem );\n\t\t}, 0 );\n\t}\n\n\tslice( start = 0, end = Infinity ): Delta {\n\t\tconst ops = [];\n\t\tconst iter = new OpIterator( this.ops );\n\t\tlet index = 0;\n\t\twhile ( index < end && iter.hasNext() ) {\n\t\t\tlet nextOp;\n\t\t\tif ( index < start ) {\n\t\t\t\tnextOp = iter.next( start - index );\n\t\t\t} else {\n\t\t\t\tnextOp = iter.next( end - index );\n\t\t\t\tops.push( nextOp );\n\t\t\t}\n\t\t\tindex += Op.length( nextOp );\n\t\t}\n\t\treturn new Delta( ops );\n\t}\n\n\tcompose( other: Delta ): Delta {\n\t\tconst thisIter = new OpIterator( this.ops );\n\t\tconst otherIter = new OpIterator( other.ops );\n\t\tconst ops = [];\n\t\tconst firstOther = otherIter.peek();\n\t\tif (\n\t\t\tfirstOther !== null &&\n\t\t\tfirstOther !== undefined &&\n\t\t\ttypeof firstOther.retain === 'number' &&\n\t\t\t( firstOther.attributes === null ||\n\t\t\t\tfirstOther.attributes === undefined )\n\t\t) {\n\t\t\tlet firstLeft = firstOther.retain;\n\t\t\twhile (\n\t\t\t\tthisIter.peekType() === 'insert' &&\n\t\t\t\tthisIter.peekLength() <= firstLeft\n\t\t\t) {\n\t\t\t\tfirstLeft -= thisIter.peekLength();\n\t\t\t\tops.push( thisIter.next() );\n\t\t\t}\n\t\t\tif ( firstOther.retain - firstLeft > 0 ) {\n\t\t\t\totherIter.next( firstOther.retain - firstLeft );\n\t\t\t}\n\t\t}\n\t\tconst delta = new Delta( ops );\n\t\twhile ( thisIter.hasNext() || otherIter.hasNext() ) {\n\t\t\tif ( otherIter.peekType() === 'insert' ) {\n\t\t\t\tdelta.push( otherIter.next() );\n\t\t\t} else if ( thisIter.peekType() === 'delete' ) {\n\t\t\t\tdelta.push( thisIter.next() );\n\t\t\t} else {\n\t\t\t\tconst length = Math.min(\n\t\t\t\t\tthisIter.peekLength(),\n\t\t\t\t\totherIter.peekLength()\n\t\t\t\t);\n\t\t\t\tconst thisOp = thisIter.next( length );\n\t\t\t\tconst otherOp = otherIter.next( length );\n\t\t\t\tif ( otherOp.retain ) {\n\t\t\t\t\tconst newOp: Op = {};\n\t\t\t\t\tif ( typeof thisOp.retain === 'number' ) {\n\t\t\t\t\t\tnewOp.retain =\n\t\t\t\t\t\t\ttypeof otherOp.retain === 'number'\n\t\t\t\t\t\t\t\t? length\n\t\t\t\t\t\t\t\t: otherOp.retain;\n\t\t\t\t\t} else if ( typeof otherOp.retain === 'number' ) {\n\t\t\t\t\t\tif (\n\t\t\t\t\t\t\tthisOp.retain === null ||\n\t\t\t\t\t\t\tthisOp.retain === undefined\n\t\t\t\t\t\t) {\n\t\t\t\t\t\t\tnewOp.insert = thisOp.insert;\n\t\t\t\t\t\t} else {\n\t\t\t\t\t\t\tnewOp.retain = thisOp.retain;\n\t\t\t\t\t\t}\n\t\t\t\t\t} else {\n\t\t\t\t\t\tconst action =\n\t\t\t\t\t\t\tthisOp.retain === null ||\n\t\t\t\t\t\t\tthisOp.retain === undefined\n\t\t\t\t\t\t\t\t? 'insert'\n\t\t\t\t\t\t\t\t: 'retain';\n\t\t\t\t\t\tconst [ embedType, thisData, otherData ] =\n\t\t\t\t\t\t\tgetEmbedTypeAndData(\n\t\t\t\t\t\t\t\tthisOp[ action ],\n\t\t\t\t\t\t\t\totherOp.retain\n\t\t\t\t\t\t\t);\n\t\t\t\t\t\tconst handler = Delta.getHandler( embedType );\n\t\t\t\t\t\tnewOp[ action ] = {\n\t\t\t\t\t\t\t[ embedType ]: handler.compose(\n\t\t\t\t\t\t\t\tthisData,\n\t\t\t\t\t\t\t\totherData,\n\t\t\t\t\t\t\t\taction === 'retain'\n\t\t\t\t\t\t\t),\n\t\t\t\t\t\t};\n\t\t\t\t\t}\n\t\t\t\t\t// Preserve null when composing with a retain, otherwise remove it for inserts\n\t\t\t\t\tconst attributes = AttributeMap.compose(\n\t\t\t\t\t\tthisOp.attributes,\n\t\t\t\t\t\totherOp.attributes,\n\t\t\t\t\t\ttypeof thisOp.retain === 'number'\n\t\t\t\t\t);\n\t\t\t\t\tif ( attributes ) {\n\t\t\t\t\t\tnewOp.attributes = attributes;\n\t\t\t\t\t}\n\t\t\t\t\tdelta.push( newOp );\n\n\t\t\t\t\t// Optimization if rest of other is just retain\n\t\t\t\t\tif (\n\t\t\t\t\t\t! otherIter.hasNext() &&\n\t\t\t\t\t\tisEqual( delta.ops[ delta.ops.length - 1 ], newOp )\n\t\t\t\t\t) {\n\t\t\t\t\t\tconst rest = new Delta( thisIter.rest() );\n\t\t\t\t\t\treturn delta.concat( rest ).chop();\n\t\t\t\t\t}\n\n\t\t\t\t\t// Other op should be delete, we could be an insert or retain\n\t\t\t\t\t// Insert + delete cancels out\n\t\t\t\t} else if (\n\t\t\t\t\ttypeof otherOp.delete === 'number' &&\n\t\t\t\t\t( typeof thisOp.retain === 'number' ||\n\t\t\t\t\t\t( typeof thisOp.retain === 'object' &&\n\t\t\t\t\t\t\tthisOp.retain !== null ) )\n\t\t\t\t) {\n\t\t\t\t\tdelta.push( otherOp );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\treturn delta.chop();\n\t}\n\n\tconcat( other: Delta ): Delta {\n\t\tconst delta = new Delta( this.ops.slice() );\n\t\tif ( other.ops.length > 0 ) {\n\t\t\tdelta.push( other.ops[ 0 ] );\n\t\t\tdelta.ops = delta.ops.concat( other.ops.slice( 1 ) );\n\t\t}\n\t\treturn delta;\n\t}\n\n\tdiff( other: Delta ): Delta {\n\t\tif ( this.ops === other.ops ) {\n\t\t\treturn new Delta();\n\t\t}\n\t\tconst strings = this.deltasToStrings( other );\n\t\tconst diffResult = diffChars( strings[ 0 ], strings[ 1 ] );\n\t\tconst thisIter = new OpIterator( this.ops );\n\t\tconst otherIter = new OpIterator( other.ops );\n\t\tconst retDelta = this.convertChangesToDelta(\n\t\t\tdiffResult,\n\t\t\tthisIter,\n\t\t\totherIter\n\t\t);\n\n\t\treturn retDelta.chop();\n\t}\n\n\teachLine(\n\t\tpredicate: (\n\t\t\tline: Delta,\n\t\t\tattributes: AttributeMap,\n\t\t\tindex: number\n\t\t) => boolean | void,\n\t\tnewline = '\\n'\n\t): void {\n\t\tconst iter = new OpIterator( this.ops );\n\t\tlet line = new Delta();\n\t\tlet i = 0;\n\t\twhile ( iter.hasNext() ) {\n\t\t\tif ( iter.peekType() !== 'insert' ) {\n\t\t\t\treturn;\n\t\t\t}\n\t\t\tconst thisOp = iter.peek();\n\t\t\tconst start = Op.length( thisOp ) - iter.peekLength();\n\t\t\tconst index =\n\t\t\t\ttypeof thisOp.insert === 'string'\n\t\t\t\t\t? thisOp.insert.indexOf( newline, start ) - start\n\t\t\t\t\t: -1;\n\t\t\tif ( index < 0 ) {\n\t\t\t\tline.push( iter.next() );\n\t\t\t} else if ( index > 0 ) {\n\t\t\t\tline.push( iter.next( index ) );\n\t\t\t} else {\n\t\t\t\tif (\n\t\t\t\t\tpredicate( line, iter.next( 1 ).attributes || {}, i ) ===\n\t\t\t\t\tfalse\n\t\t\t\t) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t\ti += 1;\n\t\t\t\tline = new Delta();\n\t\t\t}\n\t\t}\n\t\tif ( line.length() > 0 ) {\n\t\t\tpredicate( line, {}, i );\n\t\t}\n\t}\n\n\tinvert( base: Delta ): Delta {\n\t\tconst inverted = new Delta();\n\t\tthis.reduce( ( baseIndex, op ) => {\n\t\t\tif ( op.insert ) {\n\t\t\t\tinverted.delete( Op.length( op ) );\n\t\t\t} else if (\n\t\t\t\ttypeof op.retain === 'number' &&\n\t\t\t\t( op.attributes === null || op.attributes === undefined )\n\t\t\t) {\n\t\t\t\tinverted.retain( op.retain );\n\t\t\t\treturn baseIndex + op.retain;\n\t\t\t} else if ( op.delete || typeof op.retain === 'number' ) {\n\t\t\t\tconst length = ( op.delete || op.retain ) as number;\n\t\t\t\tconst slice = base.slice( baseIndex, baseIndex + length );\n\t\t\t\tslice.forEach( ( baseOp ) => {\n\t\t\t\t\tif ( op.delete ) {\n\t\t\t\t\t\tinverted.push( baseOp );\n\t\t\t\t\t} else if ( op.retain && op.attributes ) {\n\t\t\t\t\t\tinverted.retain(\n\t\t\t\t\t\t\tOp.length( baseOp ),\n\t\t\t\t\t\t\tAttributeMap.invert(\n\t\t\t\t\t\t\t\top.attributes,\n\t\t\t\t\t\t\t\tbaseOp.attributes\n\t\t\t\t\t\t\t)\n\t\t\t\t\t\t);\n\t\t\t\t\t}\n\t\t\t\t} );\n\t\t\t\treturn baseIndex + length;\n\t\t\t} else if ( typeof op.retain === 'object' && op.retain !== null ) {\n\t\t\t\tconst slice = base.slice( baseIndex, baseIndex + 1 );\n\t\t\t\tconst baseOp = new OpIterator( slice.ops ).next();\n\t\t\t\tconst [ embedType, opData, baseOpData ] = getEmbedTypeAndData(\n\t\t\t\t\top.retain,\n\t\t\t\t\tbaseOp.insert\n\t\t\t\t);\n\t\t\t\tconst handler = Delta.getHandler( embedType );\n\t\t\t\tinverted.retain(\n\t\t\t\t\t{ [ embedType ]: handler.invert( opData, baseOpData ) },\n\t\t\t\t\tAttributeMap.invert( op.attributes, baseOp.attributes )\n\t\t\t\t);\n\t\t\t\treturn baseIndex + 1;\n\t\t\t}\n\t\t\treturn baseIndex;\n\t\t}, 0 );\n\t\treturn inverted.chop();\n\t}\n\n\ttransform( index: number, priority?: boolean ): number;\n\ttransform( other: Delta, priority?: boolean ): Delta;\n\ttransform( arg: number | Delta, priority = false ): typeof arg {\n\t\tpriority = !! priority;\n\t\tif ( typeof arg === 'number' ) {\n\t\t\treturn this.transformPosition( arg, priority );\n\t\t}\n\t\tconst other: Delta = arg;\n\t\tconst thisIter = new OpIterator( this.ops );\n\t\tconst otherIter = new OpIterator( other.ops );\n\t\tconst delta = new Delta();\n\t\twhile ( thisIter.hasNext() || otherIter.hasNext() ) {\n\t\t\tif (\n\t\t\t\tthisIter.peekType() === 'insert' &&\n\t\t\t\t( priority || otherIter.peekType() !== 'insert' )\n\t\t\t) {\n\t\t\t\tdelta.retain( Op.length( thisIter.next() ) );\n\t\t\t} else if ( otherIter.peekType() === 'insert' ) {\n\t\t\t\tdelta.push( otherIter.next() );\n\t\t\t} else {\n\t\t\t\tconst length = Math.min(\n\t\t\t\t\tthisIter.peekLength(),\n\t\t\t\t\totherIter.peekLength()\n\t\t\t\t);\n\t\t\t\tconst thisOp = thisIter.next( length );\n\t\t\t\tconst otherOp = otherIter.next( length );\n\t\t\t\tif ( thisOp.delete ) {\n\t\t\t\t\t// Our delete either makes their delete redundant or removes their retain\n\t\t\t\t\tcontinue;\n\t\t\t\t} else if ( otherOp.delete ) {\n\t\t\t\t\tdelta.push( otherOp );\n\t\t\t\t} else {\n\t\t\t\t\tconst thisData = thisOp.retain;\n\t\t\t\t\tconst otherData = otherOp.retain;\n\t\t\t\t\tlet transformedData: Op[ 'retain' ] =\n\t\t\t\t\t\ttypeof otherData === 'object' && otherData !== null\n\t\t\t\t\t\t\t? otherData\n\t\t\t\t\t\t\t: length;\n\t\t\t\t\tif (\n\t\t\t\t\t\ttypeof thisData === 'object' &&\n\t\t\t\t\t\tthisData !== null &&\n\t\t\t\t\t\ttypeof otherData === 'object' &&\n\t\t\t\t\t\totherData !== null\n\t\t\t\t\t) {\n\t\t\t\t\t\tconst embedType = Object.keys( thisData )[ 0 ];\n\t\t\t\t\t\tif ( embedType === Object.keys( otherData )[ 0 ] ) {\n\t\t\t\t\t\t\tconst handler = Delta.getHandler( embedType );\n\t\t\t\t\t\t\tif ( handler ) {\n\t\t\t\t\t\t\t\ttransformedData = {\n\t\t\t\t\t\t\t\t\t[ embedType ]: handler.transform(\n\t\t\t\t\t\t\t\t\t\tthisData[ embedType ],\n\t\t\t\t\t\t\t\t\t\totherData[ embedType ],\n\t\t\t\t\t\t\t\t\t\tpriority\n\t\t\t\t\t\t\t\t\t),\n\t\t\t\t\t\t\t\t};\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\n\t\t\t\t\t// We retain either their retain or insert\n\t\t\t\t\tdelta.retain(\n\t\t\t\t\t\ttransformedData,\n\t\t\t\t\t\tAttributeMap.transform(\n\t\t\t\t\t\t\tthisOp.attributes,\n\t\t\t\t\t\t\totherOp.attributes,\n\t\t\t\t\t\t\tpriority\n\t\t\t\t\t\t)\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\treturn delta.chop();\n\t}\n\n\ttransformPosition( index: number, priority = false ): number {\n\t\tpriority = !! priority;\n\t\tconst thisIter = new OpIterator( this.ops );\n\t\tlet offset = 0;\n\t\twhile ( thisIter.hasNext() && offset <= index ) {\n\t\t\tconst length = thisIter.peekLength();\n\t\t\tconst nextType = thisIter.peekType();\n\t\t\tthisIter.next();\n\t\t\tif ( nextType === 'delete' ) {\n\t\t\t\tindex -= Math.min( length, index - offset );\n\t\t\t\tcontinue;\n\t\t\t} else if (\n\t\t\t\tnextType === 'insert' &&\n\t\t\t\t( offset < index || ! priority )\n\t\t\t) {\n\t\t\t\tindex += length;\n\t\t\t}\n\t\t\toffset += length;\n\t\t}\n\t\treturn index;\n\t}\n\n\t/**\n\t * Given a Delta and a cursor position, do a diff and attempt to adjust\n\t * the diff to place insertions or deletions at the cursor position.\n\t *\n\t * @param other             - The other Delta to diff against.\n\t * @param cursorAfterChange - The cursor position index after the change.\n\t * @return A Delta that attempts to place insertions or deletions at the cursor position.\n\t */\n\tdiffWithCursor( other: Delta, cursorAfterChange: number | null ): Delta {\n\t\tif ( this.ops === other.ops ) {\n\t\t\treturn new Delta();\n\t\t} else if ( cursorAfterChange === null ) {\n\t\t\t// If no cursor position is provided, do a regular diff.\n\t\t\treturn this.diff( other );\n\t\t}\n\n\t\tconst strings = this.deltasToStrings( other );\n\t\tlet diffs = diffChars( strings[ 0 ], strings[ 1 ] );\n\t\tlet lastDiffPosition = 0;\n\t\tconst adjustedDiffs: Change[] = [];\n\n\t\tfor ( let i = 0; i < diffs.length; i++ ) {\n\t\t\tconst diff = diffs[ i ];\n\n\t\t\tconst segmentStart = lastDiffPosition;\n\t\t\tconst segmentEnd = lastDiffPosition + ( diff.count ?? 0 );\n\t\t\tconst isCursorInSegment =\n\t\t\t\tcursorAfterChange > segmentStart &&\n\t\t\t\tcursorAfterChange <= segmentEnd;\n\n\t\t\tconst isUnchangedSegment = ! diff.added && ! diff.removed;\n\t\t\tconst isRemovalSegment = diff.removed && ! diff.added;\n\n\t\t\tconst nextDiff = diffs[ i + 1 ];\n\t\t\tconst isNextDiffAnInsert =\n\t\t\t\tnextDiff && nextDiff.added && ! nextDiff.removed;\n\n\t\t\t// Path 1: Look-ahead strategy\n\t\t\t// If the position of the cursor is in an \"unchanged\" segment, but there's an insertion\n\t\t\t// right after this section, then the insertion has likely been placed in\n\t\t\t// the incorrect spot, and we can move the insertion to the position of the cursor.\n\t\t\tif (\n\t\t\t\tisUnchangedSegment &&\n\t\t\t\tisCursorInSegment &&\n\t\t\t\tisNextDiffAnInsert\n\t\t\t) {\n\t\t\t\tconst movedSegments = this.tryMoveInsertionToCursor(\n\t\t\t\t\tdiff,\n\t\t\t\t\tnextDiff,\n\t\t\t\t\tcursorAfterChange,\n\t\t\t\t\tsegmentStart\n\t\t\t\t);\n\n\t\t\t\tif ( movedSegments ) {\n\t\t\t\t\tadjustedDiffs.push( ...movedSegments );\n\t\t\t\t\t// Skip the next diff since we've already consumed it\n\t\t\t\t\ti++;\n\t\t\t\t\tlastDiffPosition = segmentEnd;\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Path 2: Look-back strategy\n\t\t\t// Handle removals by checking if cursor was in the previous unchanged segment\n\t\t\tif ( isRemovalSegment ) {\n\t\t\t\tconst movedSegments = this.tryMoveDeletionToCursor(\n\t\t\t\t\tdiff,\n\t\t\t\t\tadjustedDiffs,\n\t\t\t\t\tcursorAfterChange,\n\t\t\t\t\tlastDiffPosition\n\t\t\t\t);\n\n\t\t\t\tif ( movedSegments ) {\n\t\t\t\t\t// Remove the previous unchanged segment from adjustedDiffs\n\t\t\t\t\tadjustedDiffs.pop();\n\t\t\t\t\tadjustedDiffs.push( ...movedSegments );\n\t\t\t\t\tlastDiffPosition += diff.count ?? 0;\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Path 3: Do nothing - add diff as-is\n\t\t\tadjustedDiffs.push( diff );\n\t\t\tif ( ! diff.added ) {\n\t\t\t\tlastDiffPosition += diff.count ?? 0;\n\t\t\t}\n\t\t}\n\n\t\tdiffs = adjustedDiffs;\n\n\t\tconst thisIter = new OpIterator( this.ops );\n\t\tconst otherIter = new OpIterator( other.ops );\n\t\tconst retDelta = this.convertChangesToDelta(\n\t\t\tdiffs,\n\t\t\tthisIter,\n\t\t\totherIter\n\t\t);\n\n\t\treturn retDelta.chop();\n\t}\n\n\t/**\n\t * Try to move an insertion operation from after an unchanged segment to the cursor position within it.\n\t * This is a \"look-ahead\" strategy.\n\t *\n\t * @param diff              - The current unchanged diff segment.\n\t * @param nextDiff          - The next diff segment (expected to be an insertion).\n\t * @param cursorAfterChange - The cursor position after the change.\n\t * @param segmentStart      - The start position of the current segment.\n\t * @return An array of adjusted diff segments if the insertion was successfully moved, null otherwise.\n\t */\n\tprivate tryMoveInsertionToCursor(\n\t\tdiff: Change,\n\t\tnextDiff: Change,\n\t\tcursorAfterChange: number,\n\t\tsegmentStart: number\n\t): Change[] | null {\n\t\tconst nextDiffInsert = nextDiff.value;\n\t\tconst insertLength = nextDiffInsert.length;\n\t\tconst insertOffset = cursorAfterChange - segmentStart - insertLength;\n\n\t\t// Verify that the inserted text matches the text at the cursor position\n\t\tconst textAtCursor = diff.value.substring(\n\t\t\tinsertOffset,\n\t\t\tinsertOffset + nextDiffInsert.length\n\t\t);\n\t\tconst isInsertMoveable = textAtCursor === nextDiffInsert;\n\n\t\t// The insert text matches what's at the cursor position,\n\t\t// so we can safely move the insertion to the cursor position.\n\t\tif ( ! isInsertMoveable ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// Split the current segment at the cursor\n\t\tconst beforeCursor = diff.value.substring( 0, insertOffset );\n\t\tconst afterCursor = diff.value.substring( insertOffset );\n\n\t\tconst result: Change[] = [];\n\n\t\t// Add before cursor part (if not empty)\n\t\tif ( beforeCursor.length > 0 ) {\n\t\t\tresult.push( {\n\t\t\t\tvalue: beforeCursor,\n\t\t\t\tcount: beforeCursor.length,\n\t\t\t\tadded: false,\n\t\t\t\tremoved: false,\n\t\t\t} );\n\t\t}\n\n\t\t// Add the insertion in the middle\n\t\tresult.push( nextDiff );\n\n\t\t// Add after cursor part (if not empty)\n\t\tif ( afterCursor.length > 0 ) {\n\t\t\tresult.push( {\n\t\t\t\tvalue: afterCursor,\n\t\t\t\tcount: afterCursor.length,\n\t\t\t\tadded: false,\n\t\t\t\tremoved: false,\n\t\t\t} );\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Try to move a deletion operation to the cursor position by looking back at the previous unchanged segment.\n\t * This is a \"look-back\" strategy.\n\t *\n\t * @param diff              - The current deletion diff segment.\n\t * @param adjustedDiffs     - The array of previously processed diff segments.\n\t * @param cursorAfterChange - The cursor position after the change.\n\t * @param lastDiffPosition  - The position in the document up to (but not including) the current diff.\n\t * @return An array of adjusted diff segments if the deletion was successfully moved, null otherwise.\n\t */\n\tprivate tryMoveDeletionToCursor(\n\t\tdiff: Change,\n\t\tadjustedDiffs: Change[],\n\t\tcursorAfterChange: number,\n\t\tlastDiffPosition: number\n\t): Change[] | null {\n\t\t// Check if there's a preceding unchanged segment where cursor falls\n\t\t// and the deleted characters match characters in that segment\n\t\tconst prevDiff = adjustedDiffs[ adjustedDiffs.length - 1 ];\n\n\t\tif ( ! prevDiff || prevDiff.added || prevDiff.removed ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst prevSegmentStart = lastDiffPosition - ( prevDiff.count ?? 0 );\n\t\tconst prevSegmentEnd = lastDiffPosition;\n\n\t\t// Check if cursor is within or at the end of the previous unchanged segment\n\t\tif (\n\t\t\tcursorAfterChange < prevSegmentStart ||\n\t\t\tcursorAfterChange >= prevSegmentEnd\n\t\t) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// Check if the deleted characters match the text at the cursor position\n\t\tconst deletedChars = diff.value;\n\t\tconst deleteOffset = cursorAfterChange - prevSegmentStart;\n\t\tconst textAtCursor = prevDiff.value.substring(\n\t\t\tdeleteOffset,\n\t\t\tdeleteOffset + deletedChars.length\n\t\t);\n\t\tconst canBePlacedHere = textAtCursor === deletedChars;\n\n\t\tif ( ! canBePlacedHere ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// Split the unchanged segment at the cursor and place deletion there\n\t\tconst beforeCursor = prevDiff.value.substring( 0, deleteOffset );\n\t\tconst atAndAfterCursor = prevDiff.value.substring( deleteOffset );\n\n\t\t// The deletion should consume characters starting at cursor\n\t\tconst deletionLength = diff.count ?? 0;\n\t\tconst afterDeletion = atAndAfterCursor.substring( deletionLength );\n\n\t\tconst result: Change[] = [];\n\n\t\t// Add before cursor part (if not empty)\n\t\tif ( beforeCursor.length > 0 ) {\n\t\t\tresult.push( {\n\t\t\t\tvalue: beforeCursor,\n\t\t\t\tcount: beforeCursor.length,\n\t\t\t\tadded: false,\n\t\t\t\tremoved: false,\n\t\t\t} );\n\t\t}\n\n\t\t// Add the deletion\n\t\tresult.push( diff );\n\n\t\t// Add after deletion part (if not empty)\n\t\tif ( afterDeletion.length > 0 ) {\n\t\t\tresult.push( {\n\t\t\t\tvalue: afterDeletion,\n\t\t\t\tcount: afterDeletion.length,\n\t\t\t\tadded: false,\n\t\t\t\tremoved: false,\n\t\t\t} );\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Convert two Deltas to string representations for diffing.\n\t *\n\t * @param other - The other Delta to convert.\n\t * @return A tuple of [thisString, otherString].\n\t */\n\tprivate deltasToStrings( other: Delta ): [ string, string ] {\n\t\treturn [ this, other ].map( ( delta ) => {\n\t\t\treturn delta\n\t\t\t\t.map( ( op ) => {\n\t\t\t\t\tif ( op.insert !== null || op.insert !== undefined ) {\n\t\t\t\t\t\treturn typeof op.insert === 'string'\n\t\t\t\t\t\t\t? op.insert\n\t\t\t\t\t\t\t: NULL_CHARACTER;\n\t\t\t\t\t}\n\t\t\t\t\tconst prep = delta === other ? 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embedType || embedType !== Object.keys( b )[ 0 ] ) {\n\t\tthrow new Error(\n\t\t\t`embed types not matched: ${ embedType } != ${\n\t\t\t\tObject.keys( b )[ 0 ]\n\t\t\t}`\n\t\t);\n\t}\n\treturn [ embedType, a[ embedType ], b[ embedType ] ];\n};\n\nclass Delta {\n\tstatic Op = Op;\n\tstatic OpIterator = OpIterator;\n\tstatic AttributeMap = AttributeMap;\n\tprivate static handlers: {\n\t\t[ embedType: string ]: EmbedHandler< unknown >;\n\t} = {};\n\n\tstatic registerEmbed< T >(\n\t\tembedType: string,\n\t\thandler: EmbedHandler< T >\n\t): void {\n\t\tthis.handlers[ embedType ] = handler as EmbedHandler< unknown >;\n\t}\n\n\tstatic unregisterEmbed( embedType: string ): void {\n\t\tdelete this.handlers[ embedType ];\n\t}\n\n\tprivate static getHandler( embedType: string ): EmbedHandler< unknown > {\n\t\tconst handler = this.handlers[ embedType ];\n\t\tif ( ! handler ) {\n\t\t\tthrow new Error( `no handlers for embed type \"${ embedType }\"` );\n\t\t}\n\t\treturn handler;\n\t}\n\n\tops: Op[];\n\tconstructor( ops?: Op[] | { ops: Op[] } ) {\n\t\t// Assume we are given a well formed ops\n\t\tif ( Array.isArray( ops ) ) {\n\t\t\tthis.ops = ops;\n\t\t} else if (\n\t\t\tops !== null &&\n\t\t\tops !== undefined &&\n\t\t\tArray.isArray( ops.ops )\n\t\t) {\n\t\t\tthis.ops = ops.ops;\n\t\t} else {\n\t\t\tthis.ops = [];\n\t\t}\n\t}\n\n\tinsert(\n\t\targ: string | Record< string, unknown >,\n\t\tattributes?: AttributeMap | null\n\t): this {\n\t\tconst newOp: Op = {};\n\t\tif ( typeof arg === 'string' && arg.length === 0 ) {\n\t\t\treturn this;\n\t\t}\n\t\tnewOp.insert = arg;\n\t\tif (\n\t\t\tattributes !== null &&\n\t\t\tattributes !== undefined &&\n\t\t\ttypeof attributes === 'object' &&\n\t\t\tObject.keys( attributes ).length > 0\n\t\t) {\n\t\t\tnewOp.attributes = attributes;\n\t\t}\n\t\treturn this.push( newOp );\n\t}\n\n\tdelete( length: number ): this {\n\t\tif ( length <= 0 ) {\n\t\t\treturn this;\n\t\t}\n\t\treturn this.push( { delete: length } );\n\t}\n\n\tretain(\n\t\tlength: number | Record< string, unknown >,\n\t\tattributes?: AttributeMap | null\n\t): this {\n\t\tif ( typeof length === 'number' && length <= 0 ) {\n\t\t\treturn this;\n\t\t}\n\t\tconst newOp: Op = { retain: length };\n\t\tif (\n\t\t\tattributes !== null &&\n\t\t\tattributes !== undefined &&\n\t\t\ttypeof attributes === 'object' &&\n\t\t\tObject.keys( attributes ).length > 0\n\t\t) {\n\t\t\tnewOp.attributes = attributes;\n\t\t}\n\t\treturn this.push( newOp );\n\t}\n\n\tpush( newOp: Op ): this {\n\t\tlet index = this.ops.length;\n\t\tlet lastOp = this.ops[ index - 1 ];\n\t\tnewOp = cloneDeep( newOp );\n\t\tif ( typeof lastOp === 'object' ) {\n\t\t\tif (\n\t\t\t\ttypeof newOp.delete === 'number' &&\n\t\t\t\ttypeof lastOp.delete === 'number'\n\t\t\t) {\n\t\t\t\tthis.ops[ index - 1 ] = {\n\t\t\t\t\tdelete: lastOp.delete + newOp.delete,\n\t\t\t\t};\n\t\t\t\treturn this;\n\t\t\t}\n\t\t\t// Since it does not matter if we insert before or after deleting at the same index,\n\t\t\t// always prefer to insert first\n\t\t\tif (\n\t\t\t\ttypeof lastOp.delete === 'number' &&\n\t\t\t\tnewOp.insert !== null &&\n\t\t\t\tnewOp.insert !== undefined\n\t\t\t) {\n\t\t\t\tindex -= 1;\n\t\t\t\tlastOp = this.ops[ index - 1 ];\n\t\t\t\tif ( typeof lastOp !== 'object' ) {\n\t\t\t\t\tthis.ops.unshift( newOp );\n\t\t\t\t\treturn this;\n\t\t\t\t}\n\t\t\t}\n\t\t\tif ( isEqual( newOp.attributes, lastOp.attributes ) ) {\n\t\t\t\tif (\n\t\t\t\t\ttypeof newOp.insert === 'string' &&\n\t\t\t\t\ttypeof lastOp.insert === 'string'\n\t\t\t\t) {\n\t\t\t\t\tthis.ops[ index - 1 ] = {\n\t\t\t\t\t\tinsert: lastOp.insert + newOp.insert,\n\t\t\t\t\t};\n\t\t\t\t\tif ( typeof newOp.attributes === 'object' ) {\n\t\t\t\t\t\tthis.ops[ index - 1 ].attributes = newOp.attributes;\n\t\t\t\t\t}\n\t\t\t\t\treturn this;\n\t\t\t\t} else if (\n\t\t\t\t\ttypeof newOp.retain === 'number' &&\n\t\t\t\t\ttypeof lastOp.retain === 'number'\n\t\t\t\t) {\n\t\t\t\t\tthis.ops[ index - 1 ] = {\n\t\t\t\t\t\tretain: lastOp.retain + newOp.retain,\n\t\t\t\t\t};\n\t\t\t\t\tif ( typeof newOp.attributes === 'object' ) {\n\t\t\t\t\t\tthis.ops[ index - 1 ].attributes = newOp.attributes;\n\t\t\t\t\t}\n\t\t\t\t\treturn this;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tif ( index === this.ops.length ) {\n\t\t\tthis.ops.push( newOp );\n\t\t} else {\n\t\t\tthis.ops.splice( index, 0, newOp );\n\t\t}\n\t\treturn this;\n\t}\n\n\tchop(): this {\n\t\tconst lastOp = this.ops[ this.ops.length - 1 ];\n\t\tif (\n\t\t\tlastOp &&\n\t\t\ttypeof lastOp.retain === 'number' &&\n\t\t\t! lastOp.attributes\n\t\t) {\n\t\t\tthis.ops.pop();\n\t\t}\n\t\treturn this;\n\t}\n\n\tfilter( predicate: ( op: Op, index: number ) => boolean ): Op[] {\n\t\treturn this.ops.filter( predicate );\n\t}\n\n\tforEach( predicate: ( op: Op, index: number ) => void ): void {\n\t\tthis.ops.forEach( predicate );\n\t}\n\n\tmap< T >( predicate: ( op: Op, index: number ) => T ): T[] {\n\t\treturn this.ops.map( predicate );\n\t}\n\n\tpartition( predicate: ( op: Op ) => boolean ): [ Op[], Op[] ] {\n\t\tconst passed: Op[] = [];\n\t\tconst failed: Op[] = [];\n\t\tthis.forEach( ( op ) => {\n\t\t\tconst target = predicate( op ) ? passed : failed;\n\t\t\ttarget.push( op );\n\t\t} );\n\t\treturn [ passed, failed ];\n\t}\n\n\treduce< T >(\n\t\tpredicate: ( accum: T, curr: Op, index: number ) => T,\n\t\tinitialValue: T\n\t): T {\n\t\treturn this.ops.reduce( predicate, initialValue );\n\t}\n\n\tchangeLength(): number {\n\t\treturn this.reduce( ( length, elem ) => {\n\t\t\tif ( elem.insert ) {\n\t\t\t\treturn length + Op.length( elem );\n\t\t\t} else if ( elem.delete ) {\n\t\t\t\treturn length - elem.delete;\n\t\t\t}\n\t\t\treturn length;\n\t\t}, 0 );\n\t}\n\n\tlength(): number {\n\t\treturn this.reduce( ( length, elem ) => {\n\t\t\treturn length + Op.length( elem );\n\t\t}, 0 );\n\t}\n\n\tslice( start = 0, end = Infinity ): Delta {\n\t\tconst ops = [];\n\t\tconst iter = new OpIterator( this.ops );\n\t\tlet index = 0;\n\t\twhile ( index < end && iter.hasNext() ) {\n\t\t\tlet nextOp;\n\t\t\tif ( index < start ) {\n\t\t\t\tnextOp = iter.next( start - index );\n\t\t\t} else {\n\t\t\t\tnextOp = iter.next( end - index );\n\t\t\t\tops.push( nextOp );\n\t\t\t}\n\t\t\tindex += Op.length( nextOp );\n\t\t}\n\t\treturn new Delta( ops );\n\t}\n\n\tcompose( other: Delta ): Delta {\n\t\tconst thisIter = new OpIterator( this.ops );\n\t\tconst otherIter = new OpIterator( other.ops );\n\t\tconst ops = [];\n\t\tconst firstOther = otherIter.peek();\n\t\tif (\n\t\t\tfirstOther !== null &&\n\t\t\tfirstOther !== undefined &&\n\t\t\ttypeof firstOther.retain === 'number' &&\n\t\t\t( firstOther.attributes === null ||\n\t\t\t\tfirstOther.attributes === undefined )\n\t\t) {\n\t\t\tlet firstLeft = firstOther.retain;\n\t\t\twhile (\n\t\t\t\tthisIter.peekType() === 'insert' &&\n\t\t\t\tthisIter.peekLength() <= firstLeft\n\t\t\t) {\n\t\t\t\tfirstLeft -= thisIter.peekLength();\n\t\t\t\tops.push( thisIter.next() );\n\t\t\t}\n\t\t\tif ( firstOther.retain - firstLeft > 0 ) {\n\t\t\t\totherIter.next( firstOther.retain - firstLeft );\n\t\t\t}\n\t\t}\n\t\tconst delta = new Delta( ops );\n\t\twhile ( thisIter.hasNext() || otherIter.hasNext() ) {\n\t\t\tif ( otherIter.peekType() === 'insert' ) {\n\t\t\t\tdelta.push( otherIter.next() );\n\t\t\t} else if ( thisIter.peekType() === 'delete' ) {\n\t\t\t\tdelta.push( thisIter.next() );\n\t\t\t} else {\n\t\t\t\tconst length = Math.min(\n\t\t\t\t\tthisIter.peekLength(),\n\t\t\t\t\totherIter.peekLength()\n\t\t\t\t);\n\t\t\t\tconst thisOp = thisIter.next( length );\n\t\t\t\tconst otherOp = otherIter.next( length );\n\t\t\t\tif ( otherOp.retain ) {\n\t\t\t\t\tconst newOp: Op = {};\n\t\t\t\t\tif ( typeof thisOp.retain === 'number' ) {\n\t\t\t\t\t\tnewOp.retain =\n\t\t\t\t\t\t\ttypeof otherOp.retain === 'number'\n\t\t\t\t\t\t\t\t? length\n\t\t\t\t\t\t\t\t: otherOp.retain;\n\t\t\t\t\t} else if ( typeof otherOp.retain === 'number' ) {\n\t\t\t\t\t\tif (\n\t\t\t\t\t\t\tthisOp.retain === null ||\n\t\t\t\t\t\t\tthisOp.retain === undefined\n\t\t\t\t\t\t) {\n\t\t\t\t\t\t\tnewOp.insert = thisOp.insert;\n\t\t\t\t\t\t} else {\n\t\t\t\t\t\t\tnewOp.retain = thisOp.retain;\n\t\t\t\t\t\t}\n\t\t\t\t\t} else {\n\t\t\t\t\t\tconst action =\n\t\t\t\t\t\t\tthisOp.retain === null ||\n\t\t\t\t\t\t\tthisOp.retain === undefined\n\t\t\t\t\t\t\t\t? 'insert'\n\t\t\t\t\t\t\t\t: 'retain';\n\t\t\t\t\t\tconst [ embedType, thisData, otherData ] =\n\t\t\t\t\t\t\tgetEmbedTypeAndData(\n\t\t\t\t\t\t\t\tthisOp[ action ],\n\t\t\t\t\t\t\t\totherOp.retain\n\t\t\t\t\t\t\t);\n\t\t\t\t\t\tconst handler = Delta.getHandler( embedType );\n\t\t\t\t\t\tnewOp[ action ] = {\n\t\t\t\t\t\t\t[ embedType ]: handler.compose(\n\t\t\t\t\t\t\t\tthisData,\n\t\t\t\t\t\t\t\totherData,\n\t\t\t\t\t\t\t\taction === 'retain'\n\t\t\t\t\t\t\t),\n\t\t\t\t\t\t};\n\t\t\t\t\t}\n\t\t\t\t\t// Preserve null when composing with a retain, otherwise remove it for inserts\n\t\t\t\t\tconst attributes = AttributeMap.compose(\n\t\t\t\t\t\tthisOp.attributes,\n\t\t\t\t\t\totherOp.attributes,\n\t\t\t\t\t\ttypeof thisOp.retain === 'number'\n\t\t\t\t\t);\n\t\t\t\t\tif ( attributes ) {\n\t\t\t\t\t\tnewOp.attributes = attributes;\n\t\t\t\t\t}\n\t\t\t\t\tdelta.push( newOp );\n\n\t\t\t\t\t// Optimization if rest of other is just retain\n\t\t\t\t\tif (\n\t\t\t\t\t\t! otherIter.hasNext() &&\n\t\t\t\t\t\tisEqual( delta.ops[ delta.ops.length - 1 ], newOp )\n\t\t\t\t\t) {\n\t\t\t\t\t\tconst rest = new Delta( thisIter.rest() );\n\t\t\t\t\t\treturn delta.concat( rest ).chop();\n\t\t\t\t\t}\n\n\t\t\t\t\t// Other op should be delete, we could be an insert or retain\n\t\t\t\t\t// Insert + delete cancels out\n\t\t\t\t} else if (\n\t\t\t\t\ttypeof otherOp.delete === 'number' &&\n\t\t\t\t\t( typeof thisOp.retain === 'number' ||\n\t\t\t\t\t\t( typeof thisOp.retain === 'object' &&\n\t\t\t\t\t\t\tthisOp.retain !== null ) )\n\t\t\t\t) {\n\t\t\t\t\tdelta.push( otherOp );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\treturn delta.chop();\n\t}\n\n\tconcat( other: Delta ): Delta {\n\t\tconst delta = new Delta( this.ops.slice() );\n\t\tif ( other.ops.length > 0 ) {\n\t\t\tdelta.push( other.ops[ 0 ] );\n\t\t\tdelta.ops = delta.ops.concat( other.ops.slice( 1 ) );\n\t\t}\n\t\treturn delta;\n\t}\n\n\tdiff( other: Delta ): Delta {\n\t\tif ( this.ops === other.ops ) {\n\t\t\treturn new Delta();\n\t\t}\n\t\tconst strings = this.deltasToStrings( other );\n\t\tconst diffResult = normalizeChangeCounts(\n\t\t\tdiffChars( strings[ 0 ], strings[ 1 ] )\n\t\t);\n\t\tconst thisIter = new OpIterator( this.ops );\n\t\tconst otherIter = new OpIterator( other.ops );\n\t\tconst retDelta = this.convertChangesToDelta(\n\t\t\tdiffResult,\n\t\t\tthisIter,\n\t\t\totherIter\n\t\t);\n\n\t\treturn retDelta.chop();\n\t}\n\n\teachLine(\n\t\tpredicate: (\n\t\t\tline: Delta,\n\t\t\tattributes: AttributeMap,\n\t\t\tindex: number\n\t\t) => boolean | void,\n\t\tnewline = '\\n'\n\t): void {\n\t\tconst iter = new OpIterator( this.ops );\n\t\tlet line = new Delta();\n\t\tlet i = 0;\n\t\twhile ( iter.hasNext() ) {\n\t\t\tif ( iter.peekType() !== 'insert' ) {\n\t\t\t\treturn;\n\t\t\t}\n\t\t\tconst thisOp = iter.peek();\n\t\t\tconst start = Op.length( thisOp ) - iter.peekLength();\n\t\t\tconst index =\n\t\t\t\ttypeof thisOp.insert === 'string'\n\t\t\t\t\t? thisOp.insert.indexOf( newline, start ) - start\n\t\t\t\t\t: -1;\n\t\t\tif ( index < 0 ) {\n\t\t\t\tline.push( iter.next() );\n\t\t\t} else if ( index > 0 ) {\n\t\t\t\tline.push( iter.next( index ) );\n\t\t\t} else {\n\t\t\t\tif (\n\t\t\t\t\tpredicate( line, iter.next( 1 ).attributes || {}, i ) ===\n\t\t\t\t\tfalse\n\t\t\t\t) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t\ti += 1;\n\t\t\t\tline = new Delta();\n\t\t\t}\n\t\t}\n\t\tif ( line.length() > 0 ) {\n\t\t\tpredicate( line, {}, i );\n\t\t}\n\t}\n\n\tinvert( base: Delta ): Delta {\n\t\tconst inverted = new Delta();\n\t\tthis.reduce( ( baseIndex, op ) => {\n\t\t\tif ( op.insert ) {\n\t\t\t\tinverted.delete( Op.length( op ) );\n\t\t\t} else if (\n\t\t\t\ttypeof op.retain === 'number' &&\n\t\t\t\t( op.attributes === null || op.attributes === undefined )\n\t\t\t) {\n\t\t\t\tinverted.retain( op.retain );\n\t\t\t\treturn baseIndex + op.retain;\n\t\t\t} else if ( op.delete || typeof op.retain === 'number' ) {\n\t\t\t\tconst length = ( op.delete || op.retain ) as number;\n\t\t\t\tconst slice = base.slice( baseIndex, baseIndex + length );\n\t\t\t\tslice.forEach( ( baseOp ) => {\n\t\t\t\t\tif ( op.delete ) {\n\t\t\t\t\t\tinverted.push( baseOp );\n\t\t\t\t\t} else if ( op.retain && op.attributes ) {\n\t\t\t\t\t\tinverted.retain(\n\t\t\t\t\t\t\tOp.length( baseOp ),\n\t\t\t\t\t\t\tAttributeMap.invert(\n\t\t\t\t\t\t\t\top.attributes,\n\t\t\t\t\t\t\t\tbaseOp.attributes\n\t\t\t\t\t\t\t)\n\t\t\t\t\t\t);\n\t\t\t\t\t}\n\t\t\t\t} );\n\t\t\t\treturn baseIndex + length;\n\t\t\t} else if ( typeof op.retain === 'object' && op.retain !== null ) {\n\t\t\t\tconst slice = base.slice( baseIndex, baseIndex + 1 );\n\t\t\t\tconst baseOp = new OpIterator( slice.ops ).next();\n\t\t\t\tconst [ embedType, opData, baseOpData ] = getEmbedTypeAndData(\n\t\t\t\t\top.retain,\n\t\t\t\t\tbaseOp.insert\n\t\t\t\t);\n\t\t\t\tconst handler = Delta.getHandler( embedType );\n\t\t\t\tinverted.retain(\n\t\t\t\t\t{ [ embedType ]: handler.invert( opData, baseOpData ) },\n\t\t\t\t\tAttributeMap.invert( op.attributes, baseOp.attributes )\n\t\t\t\t);\n\t\t\t\treturn baseIndex + 1;\n\t\t\t}\n\t\t\treturn baseIndex;\n\t\t}, 0 );\n\t\treturn inverted.chop();\n\t}\n\n\ttransform( index: number, priority?: boolean ): number;\n\ttransform( other: Delta, priority?: boolean ): Delta;\n\ttransform( arg: number | Delta, priority = false ): typeof arg {\n\t\tpriority = !! priority;\n\t\tif ( typeof arg === 'number' ) {\n\t\t\treturn this.transformPosition( arg, priority );\n\t\t}\n\t\tconst other: Delta = arg;\n\t\tconst thisIter = new OpIterator( this.ops );\n\t\tconst otherIter = new OpIterator( other.ops );\n\t\tconst delta = new Delta();\n\t\twhile ( thisIter.hasNext() || otherIter.hasNext() ) {\n\t\t\tif (\n\t\t\t\tthisIter.peekType() === 'insert' &&\n\t\t\t\t( priority || otherIter.peekType() !== 'insert' )\n\t\t\t) {\n\t\t\t\tdelta.retain( Op.length( thisIter.next() ) );\n\t\t\t} else if ( otherIter.peekType() === 'insert' ) {\n\t\t\t\tdelta.push( otherIter.next() );\n\t\t\t} else {\n\t\t\t\tconst length = Math.min(\n\t\t\t\t\tthisIter.peekLength(),\n\t\t\t\t\totherIter.peekLength()\n\t\t\t\t);\n\t\t\t\tconst thisOp = thisIter.next( length );\n\t\t\t\tconst otherOp = otherIter.next( length );\n\t\t\t\tif ( thisOp.delete ) {\n\t\t\t\t\t// Our delete either makes their delete redundant or removes their retain\n\t\t\t\t\tcontinue;\n\t\t\t\t} else if ( otherOp.delete ) {\n\t\t\t\t\tdelta.push( otherOp );\n\t\t\t\t} else {\n\t\t\t\t\tconst thisData = thisOp.retain;\n\t\t\t\t\tconst otherData = otherOp.retain;\n\t\t\t\t\tlet transformedData: Op[ 'retain' ] =\n\t\t\t\t\t\ttypeof otherData === 'object' && otherData !== null\n\t\t\t\t\t\t\t? otherData\n\t\t\t\t\t\t\t: length;\n\t\t\t\t\tif (\n\t\t\t\t\t\ttypeof thisData === 'object' &&\n\t\t\t\t\t\tthisData !== null &&\n\t\t\t\t\t\ttypeof otherData === 'object' &&\n\t\t\t\t\t\totherData !== null\n\t\t\t\t\t) {\n\t\t\t\t\t\tconst embedType = Object.keys( thisData )[ 0 ];\n\t\t\t\t\t\tif ( embedType === Object.keys( otherData )[ 0 ] ) {\n\t\t\t\t\t\t\tconst handler = Delta.getHandler( embedType );\n\t\t\t\t\t\t\tif ( handler ) {\n\t\t\t\t\t\t\t\ttransformedData = {\n\t\t\t\t\t\t\t\t\t[ embedType ]: handler.transform(\n\t\t\t\t\t\t\t\t\t\tthisData[ embedType ],\n\t\t\t\t\t\t\t\t\t\totherData[ embedType ],\n\t\t\t\t\t\t\t\t\t\tpriority\n\t\t\t\t\t\t\t\t\t),\n\t\t\t\t\t\t\t\t};\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\n\t\t\t\t\t// We retain either their retain or insert\n\t\t\t\t\tdelta.retain(\n\t\t\t\t\t\ttransformedData,\n\t\t\t\t\t\tAttributeMap.transform(\n\t\t\t\t\t\t\tthisOp.attributes,\n\t\t\t\t\t\t\totherOp.attributes,\n\t\t\t\t\t\t\tpriority\n\t\t\t\t\t\t)\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\treturn delta.chop();\n\t}\n\n\ttransformPosition( index: number, priority = false ): number {\n\t\tpriority = !! priority;\n\t\tconst thisIter = new OpIterator( this.ops );\n\t\tlet offset = 0;\n\t\twhile ( thisIter.hasNext() && offset <= index ) {\n\t\t\tconst length = thisIter.peekLength();\n\t\t\tconst nextType = thisIter.peekType();\n\t\t\tthisIter.next();\n\t\t\tif ( nextType === 'delete' ) {\n\t\t\t\tindex -= Math.min( length, index - offset );\n\t\t\t\tcontinue;\n\t\t\t} else if (\n\t\t\t\tnextType === 'insert' &&\n\t\t\t\t( offset < index || ! priority )\n\t\t\t) {\n\t\t\t\tindex += length;\n\t\t\t}\n\t\t\toffset += length;\n\t\t}\n\t\treturn index;\n\t}\n\n\t/**\n\t * Given a Delta and a cursor position, do a diff and attempt to adjust\n\t * the diff to place insertions or deletions at the cursor position.\n\t *\n\t * @param other             - The other Delta to diff against.\n\t * @param cursorAfterChange - The cursor position index after the change.\n\t * @return A Delta that attempts to place insertions or deletions at the cursor position.\n\t */\n\tdiffWithCursor( other: Delta, cursorAfterChange: number | null ): Delta {\n\t\tif ( this.ops === other.ops ) {\n\t\t\treturn new Delta();\n\t\t} else if ( cursorAfterChange === null ) {\n\t\t\t// If no cursor position is provided, do a regular diff.\n\t\t\treturn this.diff( other );\n\t\t}\n\n\t\tconst strings = this.deltasToStrings( other );\n\t\tlet diffs = normalizeChangeCounts(\n\t\t\tdiffChars( strings[ 0 ], strings[ 1 ] )\n\t\t);\n\t\tlet lastDiffPosition = 0;\n\t\tconst adjustedDiffs: Change[] = [];\n\n\t\tfor ( let i = 0; i < diffs.length; i++ ) {\n\t\t\tconst diff = diffs[ i ];\n\n\t\t\tconst segmentStart = lastDiffPosition;\n\t\t\tconst segmentEnd = lastDiffPosition + ( diff.count ?? 0 );\n\t\t\tconst isCursorInSegment =\n\t\t\t\tcursorAfterChange > segmentStart &&\n\t\t\t\tcursorAfterChange <= segmentEnd;\n\n\t\t\tconst isUnchangedSegment = ! diff.added && ! diff.removed;\n\t\t\tconst isRemovalSegment = diff.removed && ! diff.added;\n\n\t\t\tconst nextDiff = diffs[ i + 1 ];\n\t\t\tconst isNextDiffAnInsert =\n\t\t\t\tnextDiff && nextDiff.added && ! nextDiff.removed;\n\n\t\t\t// Path 1: Look-ahead strategy\n\t\t\t// If the position of the cursor is in an \"unchanged\" segment, but there's an insertion\n\t\t\t// right after this section, then the insertion has likely been placed in\n\t\t\t// the incorrect spot, and we can move the insertion to the position of the cursor.\n\t\t\tif (\n\t\t\t\tisUnchangedSegment &&\n\t\t\t\tisCursorInSegment &&\n\t\t\t\tisNextDiffAnInsert\n\t\t\t) {\n\t\t\t\tconst movedSegments = this.tryMoveInsertionToCursor(\n\t\t\t\t\tdiff,\n\t\t\t\t\tnextDiff,\n\t\t\t\t\tcursorAfterChange,\n\t\t\t\t\tsegmentStart\n\t\t\t\t);\n\n\t\t\t\tif ( movedSegments ) {\n\t\t\t\t\tadjustedDiffs.push( ...movedSegments );\n\t\t\t\t\t// Skip the next diff since we've already consumed it\n\t\t\t\t\ti++;\n\t\t\t\t\tlastDiffPosition = segmentEnd;\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Path 2: Look-back strategy\n\t\t\t// Handle removals by checking if cursor was in the previous unchanged segment\n\t\t\tif ( isRemovalSegment ) {\n\t\t\t\tconst movedSegments = this.tryMoveDeletionToCursor(\n\t\t\t\t\tdiff,\n\t\t\t\t\tadjustedDiffs,\n\t\t\t\t\tcursorAfterChange,\n\t\t\t\t\tlastDiffPosition\n\t\t\t\t);\n\n\t\t\t\tif ( movedSegments ) {\n\t\t\t\t\t// Remove the previous unchanged segment from adjustedDiffs\n\t\t\t\t\tadjustedDiffs.pop();\n\t\t\t\t\tadjustedDiffs.push( ...movedSegments );\n\t\t\t\t\tlastDiffPosition += diff.count ?? 0;\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Path 3: Do nothing - add diff as-is\n\t\t\tadjustedDiffs.push( diff );\n\t\t\tif ( ! diff.added ) {\n\t\t\t\tlastDiffPosition += diff.count ?? 0;\n\t\t\t}\n\t\t}\n\n\t\tdiffs = adjustedDiffs;\n\n\t\tconst thisIter = new OpIterator( this.ops );\n\t\tconst otherIter = new OpIterator( other.ops );\n\t\tconst retDelta = this.convertChangesToDelta(\n\t\t\tdiffs,\n\t\t\tthisIter,\n\t\t\totherIter\n\t\t);\n\n\t\treturn retDelta.chop();\n\t}\n\n\t/**\n\t * Try to move an insertion operation from after an unchanged segment to the cursor position within it.\n\t * This is a \"look-ahead\" strategy.\n\t *\n\t * @param diff              - The current unchanged diff segment.\n\t * @param nextDiff          - The next diff segment (expected to be an insertion).\n\t * @param cursorAfterChange - The cursor position after the change.\n\t * @param segmentStart      - The start position of the current segment.\n\t * @return An array of adjusted diff segments if the insertion was successfully moved, null otherwise.\n\t */\n\tprivate tryMoveInsertionToCursor(\n\t\tdiff: Change,\n\t\tnextDiff: Change,\n\t\tcursorAfterChange: number,\n\t\tsegmentStart: number\n\t): Change[] | null {\n\t\tconst nextDiffInsert = nextDiff.value;\n\t\tconst insertLength = nextDiffInsert.length;\n\t\tconst insertOffset = cursorAfterChange - segmentStart - insertLength;\n\n\t\t// Verify that the inserted text matches the text at the cursor position\n\t\tconst textAtCursor = diff.value.substring(\n\t\t\tinsertOffset,\n\t\t\tinsertOffset + nextDiffInsert.length\n\t\t);\n\t\tconst isInsertMoveable = textAtCursor === nextDiffInsert;\n\n\t\t// The insert text matches what's at the cursor position,\n\t\t// so we can safely move the insertion to the cursor position.\n\t\tif ( ! isInsertMoveable ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// Split the current segment at the cursor\n\t\tconst beforeCursor = diff.value.substring( 0, insertOffset );\n\t\tconst afterCursor = diff.value.substring( insertOffset );\n\n\t\tconst result: Change[] = [];\n\n\t\t// Add before cursor part (if not empty)\n\t\tif ( beforeCursor.length > 0 ) {\n\t\t\tresult.push( {\n\t\t\t\tvalue: beforeCursor,\n\t\t\t\tcount: beforeCursor.length,\n\t\t\t\tadded: false,\n\t\t\t\tremoved: false,\n\t\t\t} );\n\t\t}\n\n\t\t// Add the insertion in the middle\n\t\tresult.push( nextDiff );\n\n\t\t// Add after cursor part (if not empty)\n\t\tif ( afterCursor.length > 0 ) {\n\t\t\tresult.push( {\n\t\t\t\tvalue: afterCursor,\n\t\t\t\tcount: afterCursor.length,\n\t\t\t\tadded: false,\n\t\t\t\tremoved: false,\n\t\t\t} );\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Try to move a deletion operation to the cursor position by looking back at the previous unchanged segment.\n\t * This is a \"look-back\" strategy.\n\t *\n\t * @param diff              - The current deletion diff segment.\n\t * @param adjustedDiffs     - The array of previously processed diff segments.\n\t * @param cursorAfterChange - The cursor position after the change.\n\t * @param lastDiffPosition  - The position in the document up to (but not including) the current diff.\n\t * @return An array of adjusted diff segments if the deletion was successfully moved, null otherwise.\n\t */\n\tprivate tryMoveDeletionToCursor(\n\t\tdiff: Change,\n\t\tadjustedDiffs: Change[],\n\t\tcursorAfterChange: number,\n\t\tlastDiffPosition: number\n\t): Change[] | null {\n\t\t// Check if there's a preceding unchanged segment where cursor falls\n\t\t// and the deleted characters match characters in that segment\n\t\tconst prevDiff = adjustedDiffs[ adjustedDiffs.length - 1 ];\n\n\t\tif ( ! prevDiff || prevDiff.added || prevDiff.removed ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst prevSegmentStart = lastDiffPosition - ( prevDiff.count ?? 0 );\n\t\tconst prevSegmentEnd = lastDiffPosition;\n\n\t\t// Check if cursor is within or at the end of the previous unchanged segment\n\t\tif (\n\t\t\tcursorAfterChange < prevSegmentStart ||\n\t\t\tcursorAfterChange >= prevSegmentEnd\n\t\t) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// Check if the deleted characters match the text at the cursor position\n\t\tconst deletedChars = diff.value;\n\t\tconst deleteOffset = cursorAfterChange - prevSegmentStart;\n\t\tconst textAtCursor = prevDiff.value.substring(\n\t\t\tdeleteOffset,\n\t\t\tdeleteOffset + deletedChars.length\n\t\t);\n\t\tconst canBePlacedHere = textAtCursor === deletedChars;\n\n\t\tif ( ! canBePlacedHere ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// Split the unchanged segment at the cursor and place deletion there\n\t\tconst beforeCursor = prevDiff.value.substring( 0, deleteOffset );\n\t\tconst atAndAfterCursor = prevDiff.value.substring( deleteOffset );\n\n\t\t// The deletion should consume characters starting at cursor\n\t\tconst deletionLength = diff.count ?? 0;\n\t\tconst afterDeletion = atAndAfterCursor.substring( deletionLength );\n\n\t\tconst result: Change[] = [];\n\n\t\t// Add before cursor part (if not empty)\n\t\tif ( beforeCursor.length > 0 ) {\n\t\t\tresult.push( {\n\t\t\t\tvalue: beforeCursor,\n\t\t\t\tcount: beforeCursor.length,\n\t\t\t\tadded: false,\n\t\t\t\tremoved: false,\n\t\t\t} );\n\t\t}\n\n\t\t// Add the deletion\n\t\tresult.push( diff );\n\n\t\t// Add after deletion part (if not empty)\n\t\tif ( afterDeletion.length > 0 ) {\n\t\t\tresult.push( {\n\t\t\t\tvalue: afterDeletion,\n\t\t\t\tcount: afterDeletion.length,\n\t\t\t\tadded: false,\n\t\t\t\tremoved: false,\n\t\t\t} );\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Convert two Deltas to string representations for diffing.\n\t *\n\t * @param other - The other Delta to convert.\n\t * @return A tuple of [thisString, otherString].\n\t */\n\tprivate deltasToStrings( other: Delta ): [ string, string ] {\n\t\treturn [ this, other ].map( ( delta ) => {\n\t\t\treturn delta\n\t\t\t\t.map( ( op ) => {\n\t\t\t\t\tif ( op.insert !== null || op.insert !== undefined ) {\n\t\t\t\t\t\treturn typeof op.insert === 'string'\n\t\t\t\t\t\t\t? op.insert\n\t\t\t\t\t\t\t: NULL_CHARACTER;\n\t\t\t\t\t}\n\t\t\t\t\tconst prep = delta === other ? 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   "names": ["AttributeMap", "Op", "OpIterator", "isEqual"]
 }

build/types.cjs.map

 {
   "version": 3,
   "sources": ["../src/types.ts"],
-  "sourcesContent": ["/**\n * WordPress dependencies\n */\nimport type { UndoManager as WPUndoManager } from '@wordpress/undo-manager';\n\n/**\n * External dependencies\n */\nimport type * as Y from 'yjs';\nimport type { Awareness } from 'y-protocols/awareness';\n\n/* globalThis */\ndeclare global {\n\tinterface Window {\n\t\t_wpCollaborationEnabled?: string;\n\t}\n}\n\nexport type CRDTDoc = Y.Doc;\nexport type AwarenessID = string;\nexport type EntityID = string;\nexport type ObjectID = string;\nexport type ObjectType = string;\n\n// An origin is a value passed by the transactor to identify the source of a\n// change. It can be any value, and is not used internally by Yjs. Origins are\n// preserved locally, while a remote change will have the provider instance as\n// its origin.\nexport type Origin = any;\n\n// Object data represents any entity record. There are not any expectations that\n// can hold on its shape, beyond a record with string keys and unknown values.\nexport type ObjectData = Record< string, unknown >;\n\n/**\n * Event map for provider events.\n * Add new event types here as needed.\n */\nexport interface ProviderEventMap {\n\tstatus: ConnectionStatus;\n}\n\n/**\n * Generic event listener type for providers.\n * Providers should call registered callbacks when events occur like connection status changes.\n * Providers are responsible for cleaning up listeners in their destroy() method.\n */\nexport type ProviderOn = < K extends keyof ProviderEventMap >(\n\tevent: K,\n\tcallback: ( data: ProviderEventMap[ K ] ) => void\n) => void;\n\nexport interface ProviderCreatorResult {\n\tdestroy: () => void;\n\ton: ProviderOn;\n}\n\n/**\n * Error codes for connection errors that can occur in sync providers.\n */\nexport type ConnectionErrorCode =\n\t| 'authentication-error'\n\t| 'connection-expired'\n\t| 'connection-limit-exceeded'\n\t| 'unknown-error';\n\n/**\n * Sync connection error object.\n */\nexport interface ConnectionError extends Error {\n\t/**\n\t * Error code identifier for programmatic handling and default message lookup.\n\t */\n\tcode: ConnectionErrorCode;\n}\n\n/**\n * Current connection status of a sync provider, including status and optional error information.\n */\nexport interface ConnectionStatus {\n\tstatus: 'connected' | 'connecting' | 'disconnected';\n\n\t/**\n\t * Optional error information when status is 'disconnected'.\n\t */\n\terror?: ConnectionError;\n}\n\nexport type OnStatusChangeCallback = (\n\tstatus: ConnectionStatus | null\n) => void;\n\n/**\n * Options passed to a provider creator function when initializing a sync provider.\n */\nexport interface ProviderCreatorOptions {\n\tobjectType: ObjectType;\n\tobjectId: ObjectID | null;\n\tydoc: Y.Doc;\n\tawareness?: Awareness;\n}\n\nexport type ProviderCreator = (\n\toptions: ProviderCreatorOptions\n) => Promise< ProviderCreatorResult >;\n\nexport interface CollectionHandlers {\n\tonStatusChange: OnStatusChangeCallback;\n\trefetchRecords: () => Promise< void >;\n}\n\nexport interface SyncManagerUpdateOptions {\n\tisSave?: boolean;\n\tisNewUndoLevel?: boolean;\n}\n\nexport interface RecordHandlers {\n\taddUndoMeta: ( ydoc: Y.Doc, meta: Map< string, any > ) => void;\n\teditRecord: (\n\t\tdata: Partial< ObjectData >,\n\t\toptions?: { undoIgnore?: boolean }\n\t) => void;\n\tgetEditedRecord: () => Promise< ObjectData >;\n\tonStatusChange: OnStatusChangeCallback;\n\trefetchRecord: () => Promise< void >;\n\trestoreUndoMeta: ( ydoc: Y.Doc, meta: Map< string, any > ) => void;\n\tsaveRecord: () => void;\n}\n\nexport interface SyncConfig {\n\tapplyChangesToCRDTDoc: (\n\t\tydoc: Y.Doc,\n\t\tchanges: Partial< ObjectData >\n\t) => void;\n\tcreateAwareness?: (\n\t\tydoc: Y.Doc,\n\t\tobjectId?: ObjectID\n\t) => Awareness | undefined;\n\tgetChangesFromCRDTDoc: (\n\t\tydoc: Y.Doc,\n\t\teditedRecord: ObjectData\n\t) => ObjectData;\n\tgetPersistedCRDTDoc?: ( record: ObjectData ) => string | null;\n}\n\nexport interface SyncManager {\n\tcreatePersistedCRDTDoc: (\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID\n\t) => string | null;\n\tgetAwareness: < State extends Awareness >(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID\n\t) => State | undefined;\n\tload: (\n\t\tsyncConfig: SyncConfig,\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID,\n\t\trecord: ObjectData,\n\t\thandlers: RecordHandlers\n\t) => Promise< void >;\n\tloadCollection: (\n\t\tsyncConfig: SyncConfig,\n\t\tobjectType: ObjectType,\n\t\thandlers: CollectionHandlers\n\t) => Promise< void >;\n\t// undoManager is undefined until the first entity is loaded.\n\tundoManager: SyncUndoManager | undefined;\n\tunload: ( objectType: ObjectType, objectId: ObjectID ) => void;\n\tupdate: (\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID | null,\n\t\tchanges: Partial< ObjectData >,\n\t\torigin: string,\n\t\toptions?: SyncManagerUpdateOptions\n\t) => void;\n}\n\nexport interface SyncUndoManager extends WPUndoManager< ObjectData > {\n\taddToScope: (\n\t\tymap: Y.Map< any >,\n\t\thandlers: Pick< RecordHandlers, 'addUndoMeta' | 'restoreUndoMeta' >\n\t) => void;\n\tstopCapturing: () => void;\n}\n"],
+  "sourcesContent": ["/**\n * WordPress dependencies\n */\nimport type { UndoManager as WPUndoManager } from '@wordpress/undo-manager';\n\n/**\n * External dependencies\n */\nimport type * as Y from 'yjs';\nimport type { Awareness } from 'y-protocols/awareness';\n\n/* globalThis */\ndeclare global {\n\tinterface Window {\n\t\t_wpCollaborationEnabled?: string;\n\t}\n}\n\nexport type CRDTDoc = Y.Doc;\nexport type AwarenessID = string;\nexport type EntityID = string;\nexport type ObjectID = string;\nexport type ObjectType = string;\n\n// An origin is a value passed by the transactor to identify the source of a\n// change. It can be any value, and is not used internally by Yjs. Origins are\n// preserved locally, while a remote change will have the provider instance as\n// its origin.\nexport type Origin = any;\n\n// Object data represents any entity record. There are not any expectations that\n// can hold on its shape, beyond a record with string keys and unknown values.\nexport type ObjectData = Record< string, unknown >;\n\n/**\n * Event map for provider events.\n * Add new event types here as needed.\n */\nexport interface ProviderEventMap {\n\tstatus: ConnectionStatus;\n}\n\n/**\n * Generic event listener type for providers.\n * Providers should call registered callbacks when events occur like connection status changes.\n * Providers are responsible for cleaning up listeners in their destroy() method.\n */\nexport type ProviderOn = < K extends keyof ProviderEventMap >(\n\tevent: K,\n\tcallback: ( data: ProviderEventMap[ K ] ) => void\n) => void;\n\nexport interface ProviderCreatorResult {\n\tdestroy: () => void;\n\ton: ProviderOn;\n}\n\n/**\n * Error codes for connection errors that can occur in sync providers.\n */\nexport type ConnectionErrorCode =\n\t| 'authentication-error'\n\t| 'connection-expired'\n\t| 'connection-limit-exceeded'\n\t| 'unknown-error';\n\n/**\n * Sync connection error object.\n */\nexport interface ConnectionError extends Error {\n\t/**\n\t * Error code identifier for programmatic handling and default message lookup.\n\t */\n\tcode: ConnectionErrorCode;\n}\n\n/**\n * Current connection status of a sync provider.\n */\nexport interface ConnectionStatusConnected {\n\tstatus: 'connected';\n}\n\nexport interface ConnectionStatusConnecting {\n\tstatus: 'connecting';\n}\n\nexport interface ConnectionStatusDisconnected {\n\tstatus: 'disconnected';\n\t/** Optional error information. */\n\terror?: ConnectionError;\n\t/** Milliseconds until the next automatic retry attempt. */\n\tretryInMs?: number;\n}\n\nexport type ConnectionStatus =\n\t| ConnectionStatusConnected\n\t| ConnectionStatusConnecting\n\t| ConnectionStatusDisconnected;\n\nexport type OnStatusChangeCallback = (\n\tstatus: ConnectionStatus | null\n) => void;\n\n/**\n * Options passed to a provider creator function when initializing a sync provider.\n */\nexport interface ProviderCreatorOptions {\n\tobjectType: ObjectType;\n\tobjectId: ObjectID | null;\n\tydoc: Y.Doc;\n\tawareness?: Awareness;\n}\n\nexport type ProviderCreator = (\n\toptions: ProviderCreatorOptions\n) => Promise< ProviderCreatorResult >;\n\nexport interface CollectionHandlers {\n\tonStatusChange: OnStatusChangeCallback;\n\trefetchRecords: () => Promise< void >;\n}\n\nexport interface SyncManagerUpdateOptions {\n\tisSave?: boolean;\n\tisNewUndoLevel?: boolean;\n}\n\nexport interface RecordHandlers {\n\taddUndoMeta: ( ydoc: Y.Doc, meta: Map< string, any > ) => void;\n\teditRecord: (\n\t\tdata: Partial< ObjectData >,\n\t\toptions?: { undoIgnore?: boolean }\n\t) => void;\n\tgetEditedRecord: () => Promise< ObjectData >;\n\tonStatusChange: OnStatusChangeCallback;\n\trefetchRecord: () => Promise< void >;\n\trestoreUndoMeta: ( ydoc: Y.Doc, meta: Map< string, any > ) => void;\n\tsaveRecord: () => void;\n}\n\nexport interface SyncConfig {\n\tapplyChangesToCRDTDoc: (\n\t\tydoc: Y.Doc,\n\t\tchanges: Partial< ObjectData >\n\t) => void;\n\tcreateAwareness?: (\n\t\tydoc: Y.Doc,\n\t\tobjectId?: ObjectID\n\t) => Awareness | undefined;\n\tgetChangesFromCRDTDoc: (\n\t\tydoc: Y.Doc,\n\t\teditedRecord: ObjectData\n\t) => ObjectData;\n\tgetPersistedCRDTDoc?: ( record: ObjectData ) => string | null;\n}\n\nexport interface SyncManager {\n\tcreatePersistedCRDTDoc: (\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID\n\t) => Promise< string | null >;\n\tgetAwareness: < State extends Awareness >(\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID\n\t) => State | undefined;\n\tload: (\n\t\tsyncConfig: SyncConfig,\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID,\n\t\trecord: ObjectData,\n\t\thandlers: RecordHandlers\n\t) => Promise< void >;\n\tloadCollection: (\n\t\tsyncConfig: SyncConfig,\n\t\tobjectType: ObjectType,\n\t\thandlers: CollectionHandlers\n\t) => Promise< void >;\n\t// undoManager is undefined until the first entity is loaded.\n\tundoManager: SyncUndoManager | undefined;\n\tunload: ( objectType: ObjectType, objectId: ObjectID ) => void;\n\tupdate: (\n\t\tobjectType: ObjectType,\n\t\tobjectId: ObjectID | null,\n\t\tchanges: Partial< ObjectData >,\n\t\torigin: string,\n\t\toptions?: SyncManagerUpdateOptions\n\t) => void;\n}\n\nexport interface SyncUndoManager extends WPUndoManager< ObjectData > {\n\taddToScope: (\n\t\tymap: Y.Map< any >,\n\t\thandlers: Pick< RecordHandlers, 'addUndoMeta' | 'restoreUndoMeta' >\n\t) => void;\n\tstopCapturing: () => void;\n}\n"],
   "mappings": ";;;;;;;;;;;;;;;;AAAA;AAAA;",
   "names": []
 }

build/utils.cjs

@@ -35,2 +35,3 @@ "use strict";
   deserializeCrdtDoc: () => deserializeCrdtDoc,
+  initializeYjsDoc: () => initializeYjsDoc,
   markEntityAsSaved: () => markEntityAsSaved,
@@ -47,6 +48,7 @@ serializeCrdtDoc: () => serializeCrdtDoc
   );
-  const ydoc = new Y.Doc({ meta: metaMap });
+  return new Y.Doc({ meta: metaMap });
+}
+function initializeYjsDoc(ydoc) {
   const stateMap = ydoc.getMap(import_config.CRDT_STATE_MAP_KEY);
   stateMap.set(import_config.CRDT_STATE_MAP_VERSION_KEY, import_config.CRDT_DOC_VERSION);
-  return ydoc;
 }
@@ -87,2 +89,3 @@ function markEntityAsSaved(ydoc) {
   deserializeCrdtDoc,
+  initializeYjsDoc,
   markEntityAsSaved,
@@ -89,0 +92,0 @@ serializeCrdtDoc

build/utils.cjs.map

 {
   "version": 3,
   "sources": ["../src/utils.ts"],
-  "sourcesContent": ["/**\n * External dependencies\n */\nimport * as Y from 'yjs';\nimport * as buffer from 'lib0/buffer';\n\n/**\n * Internal dependencies\n */\nimport {\n\tCRDT_DOC_META_PERSISTENCE_KEY,\n\tCRDT_DOC_VERSION,\n\tCRDT_STATE_MAP_KEY,\n\tCRDT_STATE_MAP_SAVED_AT_KEY as SAVED_AT_KEY,\n\tCRDT_STATE_MAP_SAVED_BY_KEY as SAVED_BY_KEY,\n\tCRDT_STATE_MAP_VERSION_KEY as VERSION_KEY,\n} from './config';\nimport type { CRDTDoc } from './types';\n\n// An object representation of CRDT document metadata.\ntype DocumentMeta = Record< string, DocumentMetaValue >;\ntype DocumentMetaValue = boolean | number | string;\n\nexport function createYjsDoc( documentMeta: DocumentMeta = {} ): Y.Doc {\n\t// Convert the object representation of CRDT document metadata to a map.\n\t// Document metadata is passed to the Y.Doc constructor and stored in its\n\t// `meta` property. It is not synced to peers or persisted with the document.\n\t// It is just a place to store transient information about this doc instance.\n\tconst metaMap = new Map< string, DocumentMetaValue >(\n\t\tObject.entries( documentMeta )\n\t);\n\n\tconst ydoc = new Y.Doc( { meta: metaMap } );\n\tconst stateMap = ydoc.getMap( CRDT_STATE_MAP_KEY );\n\n\tstateMap.set( VERSION_KEY, CRDT_DOC_VERSION );\n\n\treturn ydoc;\n}\n\n/**\n * Record that the entity was saved (persisted to the database) in the CRDT\n * document record metadata.\n *\n * @param {CRDTDoc} ydoc CRDT document.\n */\nexport function markEntityAsSaved( ydoc: CRDTDoc ): void {\n\tconst recordMeta = ydoc.getMap( CRDT_STATE_MAP_KEY );\n\trecordMeta.set( SAVED_AT_KEY, Date.now() );\n\trecordMeta.set( SAVED_BY_KEY, ydoc.clientID );\n}\n\nfunction pseudoRandomID(): number {\n\treturn Math.floor( Math.random() * 1000000000 );\n}\n\nexport function serializeCrdtDoc( crdtDoc: CRDTDoc ): string {\n\treturn JSON.stringify( {\n\t\tdocument: buffer.toBase64( Y.encodeStateAsUpdateV2( crdtDoc ) ),\n\t\tupdateId: pseudoRandomID(), // helps with debugging\n\t} );\n}\n\nexport function deserializeCrdtDoc(\n\tserializedCrdtDoc: string\n): CRDTDoc | null {\n\ttry {\n\t\tconst { document } = JSON.parse( serializedCrdtDoc );\n\n\t\t// Mark this document as from persistence.\n\t\tconst docMeta: DocumentMeta = {\n\t\t\t[ CRDT_DOC_META_PERSISTENCE_KEY ]: true,\n\t\t};\n\n\t\t// Apply the document as an update against a new (temporary) Y.Doc.\n\t\tconst ydoc = createYjsDoc( docMeta );\n\t\tconst yupdate = buffer.fromBase64( document );\n\t\tY.applyUpdateV2( ydoc, yupdate );\n\n\t\t// Overwrite the client ID (which is from a previous session) with a random\n\t\t// client ID. Deserialized documents should not be used directly. Instead,\n\t\t// their state should be applied to another in-use document.\n\t\tydoc.clientID = pseudoRandomID();\n\n\t\treturn ydoc;\n\t} catch ( e ) {\n\t\treturn null;\n\t}\n}\n"],
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+  "sourcesContent": ["/**\n * External dependencies\n */\nimport * as Y from 'yjs';\nimport * as buffer from 'lib0/buffer';\n\n/**\n * Internal dependencies\n */\nimport {\n\tCRDT_DOC_META_PERSISTENCE_KEY,\n\tCRDT_DOC_VERSION,\n\tCRDT_STATE_MAP_KEY,\n\tCRDT_STATE_MAP_SAVED_AT_KEY as SAVED_AT_KEY,\n\tCRDT_STATE_MAP_SAVED_BY_KEY as SAVED_BY_KEY,\n\tCRDT_STATE_MAP_VERSION_KEY as VERSION_KEY,\n} from './config';\nimport type { CRDTDoc } from './types';\n\n// An object representation of CRDT document metadata.\ntype DocumentMeta = Record< string, DocumentMetaValue >;\ntype DocumentMetaValue = boolean | number | string;\n\n/**\n * Creates a new Y.Doc instance with the given document metadata.\n *\n * @param {DocumentMeta} documentMeta Optional metadata to associate with the\n *                                    document. Metadata is not persisted.\n */\nexport function createYjsDoc( documentMeta: DocumentMeta = {} ): CRDTDoc {\n\t// Convert the object representation of CRDT document metadata to a map.\n\t// Document metadata is passed to the Y.Doc constructor and stored in its\n\t// `meta` property. It is not synced to peers or persisted with the document.\n\t// It is just a place to store transient information about this doc instance.\n\tconst metaMap = new Map< string, DocumentMetaValue >(\n\t\tObject.entries( documentMeta )\n\t);\n\n\t// IMPORTANT: Do not add update the document itself to avoid generating updates\n\t// before observers are attached. Add initial updates in `initializeYjsDoc`.\n\treturn new Y.Doc( { meta: metaMap } );\n}\n\n/**\n * Initializes a Y.Doc instance with the necessary CRDT state for our use case.\n *\n * @param {Y.Doc} ydoc Y.Doc instance to initialize.\n */\nexport function initializeYjsDoc( ydoc: CRDTDoc ): void {\n\tconst stateMap = ydoc.getMap( CRDT_STATE_MAP_KEY );\n\tstateMap.set( VERSION_KEY, CRDT_DOC_VERSION );\n}\n\n/**\n * Record that the entity was saved (persisted to the database) in the CRDT\n * document record metadata.\n *\n * @param {CRDTDoc} ydoc CRDT document.\n */\nexport function markEntityAsSaved( ydoc: CRDTDoc ): void {\n\tconst recordMeta = ydoc.getMap( CRDT_STATE_MAP_KEY );\n\trecordMeta.set( SAVED_AT_KEY, Date.now() );\n\trecordMeta.set( SAVED_BY_KEY, ydoc.clientID );\n}\n\nfunction pseudoRandomID(): number {\n\treturn Math.floor( Math.random() * 1000000000 );\n}\n\nexport function serializeCrdtDoc( crdtDoc: CRDTDoc ): string {\n\treturn JSON.stringify( {\n\t\tdocument: buffer.toBase64( Y.encodeStateAsUpdateV2( crdtDoc ) ),\n\t\tupdateId: pseudoRandomID(), // helps with debugging\n\t} );\n}\n\nexport function deserializeCrdtDoc(\n\tserializedCrdtDoc: string\n): CRDTDoc | null {\n\ttry {\n\t\tconst { document } = JSON.parse( serializedCrdtDoc );\n\n\t\t// Mark this document as from persistence.\n\t\tconst docMeta: DocumentMeta = {\n\t\t\t[ CRDT_DOC_META_PERSISTENCE_KEY ]: true,\n\t\t};\n\n\t\t// Apply the document as an update against a new (temporary) Y.Doc.\n\t\tconst ydoc = createYjsDoc( docMeta );\n\t\tconst yupdate = buffer.fromBase64( document );\n\t\tY.applyUpdateV2( ydoc, yupdate );\n\n\t\t// Overwrite the client ID (which is from a previous session) with a random\n\t\t// client ID. Deserialized documents should not be used directly. Instead,\n\t\t// their state should be applied to another in-use document.\n\t\tydoc.clientID = pseudoRandomID();\n\n\t\treturn ydoc;\n\t} catch ( e ) {\n\t\treturn null;\n\t}\n}\n"],
+  "mappings": ";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAAA;AAGA,QAAmB;AACnB,aAAwB;AAKxB,oBAOO;AAaA,SAAS,aAAc,eAA6B,CAAC,GAAa;AAKxE,QAAM,UAAU,IAAI;AAAA,IACnB,OAAO,QAAS,YAAa;AAAA,EAC9B;AAIA,SAAO,IAAM,MAAK,EAAE,MAAM,QAAQ,CAAE;AACrC;AAOO,SAAS,iBAAkB,MAAsB;AACvD,QAAM,WAAW,KAAK,OAAQ,gCAAmB;AACjD,WAAS,IAAK,cAAAA,4BAAa,8BAAiB;AAC7C;AAQO,SAAS,kBAAmB,MAAsB;AACxD,QAAM,aAAa,KAAK,OAAQ,gCAAmB;AACnD,aAAW,IAAK,cAAAC,6BAAc,KAAK,IAAI,CAAE;AACzC,aAAW,IAAK,cAAAC,6BAAc,KAAK,QAAS;AAC7C;AAEA,SAAS,iBAAyB;AACjC,SAAO,KAAK,MAAO,KAAK,OAAO,IAAI,GAAW;AAC/C;AAEO,SAAS,iBAAkB,SAA2B;AAC5D,SAAO,KAAK,UAAW;AAAA,IACtB,UAAiB,gBAAY,wBAAuB,OAAQ,CAAE;AAAA,IAC9D,UAAU,eAAe;AAAA;AAAA,EAC1B,CAAE;AACH;AAEO,SAAS,mBACf,mBACiB;AACjB,MAAI;AACH,UAAM,EAAE,SAAS,IAAI,KAAK,MAAO,iBAAkB;AAGnD,UAAM,UAAwB;AAAA,MAC7B,CAAE,2CAA8B,GAAG;AAAA,IACpC;AAGA,UAAM,OAAO,aAAc,OAAQ;AACnC,UAAM,UAAiB,kBAAY,QAAS;AAC5C,IAAE,gBAAe,MAAM,OAAQ;AAK/B,SAAK,WAAW,eAAe;AAE/B,WAAO;AAAA,EACR,SAAU,GAAI;AACb,WAAO;AAAA,EACR;AACD;",
   "names": ["VERSION_KEY", "SAVED_AT_KEY", "SAVED_BY_KEY"]
 }

CHANGELOG.md

@@ -5,2 +5,4 @@ <!-- Learn how to maintain this file at https://github.com/WordPress/gutenberg/tree/HEAD/packages#maintaining-changelogs. -->
 
+## 1.41.0 (2026-03-04)
+
 ## 1.40.0 (2026-02-18)
@@ -7,0 +9,0 @@

package.json

 {
 	"name": "@wordpress/sync",
-	"version": "1.40.1-next.v.202602271551.0+464abe399",
+	"version": "1.41.0",
 	"description": "Sync Data.",
@@ -47,6 +47,6 @@ "author": "The WordPress Contributors",
 	"dependencies": {
-		"@wordpress/api-fetch": "^7.40.1-next.v.202602271551.0+464abe399",
-		"@wordpress/hooks": "^4.40.1-next.v.202602271551.0+464abe399",
-		"@wordpress/private-apis": "^1.40.1-next.v.202602271551.0+464abe399",
-		"@wordpress/undo-manager": "^1.40.1-next.v.202602271551.0+464abe399",
+		"@wordpress/api-fetch": "^7.41.0",
+		"@wordpress/hooks": "^4.41.0",
+		"@wordpress/private-apis": "^1.41.0",
+		"@wordpress/undo-manager": "^1.41.0",
 		"diff": "^8.0.3",
@@ -65,3 +65,3 @@ "fast-deep-equal": "^3.1.3",
 	},
-	"gitHead": "95aa7055a5757219e2d96a91efc69f7dd1b2d4c3"
+	"gitHead": "8bfc179b9aed74c0a6dd6e8edf7a49e40e4f87cc"
 }

src/manager.ts

@@ -40,2 +40,3 @@ /**
 	deserializeCrdtDoc,
+	initializeYjsDoc,
 	markEntityAsSaved,
@@ -288,2 +289,5 @@ serializeCrdtDoc,
 
+		// Initialize the Yjs document with the necessary CRDT state.
+		initializeYjsDoc( ydoc );
+
 		// Get and apply the persisted CRDT document, if it exists.
@@ -389,2 +393,5 @@ internal.applyPersistedCrdtDoc( objectType, objectId, record );
 		stateMap.observe( onStateMapUpdate );
+
+		// Initialize the Yjs document with the necessary CRDT state.
+		initializeYjsDoc( ydoc );
 	}
@@ -632,6 +639,6 @@
 	 */
-	function createPersistedCRDTDoc(
+	async function createPersistedCRDTDoc(
 		objectType: ObjectType,
 		objectId: ObjectID
-	): string | null {
+	): Promise< string | null > {
 		const entityId = getEntityId( objectType, objectId );
@@ -644,2 +651,7 @@ const entityState = entityStates.get( entityId );
 
+		// Y.Doc updates are deferred via yieldToEventLoop. Await a promise that
+		// resolves on the next tick of the event loop so pending updates are flushed
+		// before we serialize the document.
+		await new Promise( ( resolve ) => setTimeout( resolve, 0 ) );
+
 		return serializeCrdtDoc( entityState.ydoc );
@@ -646,0 +658,0 @@ }

src/private-apis.ts

@@ -11,2 +11,3 @@ /**
 import { createSyncManager } from './manager';
+import { pollingManager } from './providers/http-polling/polling-manager';
 import { default as Delta } from './quill-delta/Delta';
@@ -22,2 +23,3 @@
 	LOCAL_EDITOR_ORIGIN,
+	retrySyncConnection: () => pollingManager.retryNow(),
 } );

src/providers/http-polling/http-polling-provider.ts

@@ -85,9 +85,12 @@ /**
 	/**
-	 * Emit connection status.
+	 * Emit connection status, passing the full object through so that
+	 * additional fields (e.g. `retryInMs`) are preserved for consumers.
 	 *
-	 * @param status        The connection status
-	 * @param status.error  Optional error information when status is 'disconnected'
-	 * @param status.status The connection status ('connected', 'connecting', 'disconnected')
+	 * @param connectionStatus The connection status object
 	 */
-	protected emitStatus = ( { error, status }: ConnectionStatus ): void => {
+	protected emitStatus = ( connectionStatus: ConnectionStatus ): void => {
+		const { status } = connectionStatus;
+		const error =
+			status === 'disconnected' ? connectionStatus.error : undefined;
+
 		if ( this.status === status && ! error ) {
@@ -106,3 +109,3 @@ return;
 		this.status = status;
-		this.emit( 'status', [ { error, status } ] );
+		this.emit( 'status', [ connectionStatus ] );
 	};
@@ -109,0 +112,0 @@

src/providers/http-polling/polling-manager.ts

@@ -33,3 +33,5 @@ /**
 const POLLING_INTERVAL_WITH_COLLABORATORS_IN_MS = 250; // 250 milliseconds
-const POLLING_INTERVAL_BACKGROUND_TAB_IN_MS = 30 * 1000; // 30 seconds
+// Must be less than the server-side AWARENESS_TIMEOUT (30 s) to avoid
+// false disconnects when the tab is in the background.
+const POLLING_INTERVAL_BACKGROUND_TAB_IN_MS = 25 * 1000; // 25 seconds
 const MAX_ERROR_BACKOFF_IN_MS = 30 * 1000; // 30 seconds
@@ -42,2 +44,3 @@ const POLLING_MANAGER_ORIGIN = 'polling-manager';
 	registerRoom: ( options: RegisterRoomOptions ) => void;
+	retryNow: () => void;
 	unregisterRoom: ( room: string ) => void;
@@ -302,5 +305,11 @@ }
 		 *
-		 * This ensures that any updates by collaborators are immediately reflected
-		 * in the document once the browser tab becomes active. Otherwise there would
-		 * be a delay of 30 seconds before the updates came through.
+		 * This ensures that any updates by collaborators are immediately
+		 * reflected in the document once the browser tab becomes active.
+		 * Otherwise there would be a delay of up to 30 seconds before the
+		 * updates came through.
+		 *
+		 * Only repoll if we cleared a pending timeout, meaning the poll loop
+		 * was idle between cycles. If no timeout is pending, a poll request
+		 * is already in-flight and will pick up the updated isActiveBrowser
+		 * value when it schedules the next cycle.
 		 */
@@ -310,5 +319,2 @@ if ( pollingTimeoutId ) {
 			pollingTimeoutId = null;
-		}
-
-		if ( isPolling ) {
 			poll();
@@ -321,2 +327,3 @@ }
 	isPolling = true;
+	pollingTimeoutId = null;
 
@@ -446,3 +453,6 @@ async function start(): Promise< void > {
 				roomStates.forEach( ( state ) => {
-					state.onStatusChange( { status: 'disconnected' } );
+					state.onStatusChange( {
+						status: 'disconnected',
+						retryInMs: pollInterval,
+					} );
 				} );
@@ -558,5 +568,21 @@ }
 
+/**
+ * Immediately retry the sync connection by cancelling any pending backoff
+ * timeout and triggering a new poll. If a request is already in-flight,
+ * the backoff interval is reset so the next scheduled poll fires sooner.
+ */
+function retryNow(): void {
+	pollInterval = POLLING_INTERVAL_IN_MS * 2;
+
+	if ( pollingTimeoutId ) {
+		clearTimeout( pollingTimeoutId );
+		pollingTimeoutId = null;
+		poll();
+	}
+}
+
 export const pollingManager: PollingManager = {
 	registerRoom,
+	retryNow,
 	unregisterRoom,
 };

src/quill-delta/Delta.ts

@@ -27,2 +27,17 @@ // File copied https://github.com/slab/delta/blob/main/src/Delta.ts with changes:
 
+/**
+ * Normalize diff changes so that `count` reflects UTF-16 code-unit length
+ * rather than grapheme-cluster count (which diffChars may return when
+ * Intl.Segmenter is available, e.g. diff v8+).
+ *
+ * @param changes - The array of changes from diffChars.
+ * @return The changes with `count` normalized to UTF-16 code-unit length.
+ */
+function normalizeChangeCounts( changes: Change[] ): Change[] {
+	return changes.map( ( change ) => ( {
+		...change,
+		count: change.value.length,
+	} ) );
+}
+
 interface EmbedHandler< T > {
@@ -403,3 +418,5 @@ compose: ( a: T, b: T, keepNull: boolean ) => T;
 		const strings = this.deltasToStrings( other );
-		const diffResult = diffChars( strings[ 0 ], strings[ 1 ] );
+		const diffResult = normalizeChangeCounts(
+			diffChars( strings[ 0 ], strings[ 1 ] )
+		);
 		const thisIter = new OpIterator( this.ops );
@@ -617,3 +634,5 @@ const otherIter = new OpIterator( other.ops );
 		const strings = this.deltasToStrings( other );
-		let diffs = diffChars( strings[ 0 ], strings[ 1 ] );
+		let diffs = normalizeChangeCounts(
+			diffChars( strings[ 0 ], strings[ 1 ] )
+		);
 		let lastDiffPosition = 0;
@@ -620,0 +639,0 @@ const adjustedDiffs: Change[] = [];

src/quill-delta/test/Delta.ts

@@ -461,2 +461,233 @@ /**
 	} );
+
+	describe( 'emoji and surrogate pair handling', () => {
+		// Emoji like 😀 (U+1F600) are represented as surrogate pairs in UTF-16,
+		// so '😀'.length === 2 in JavaScript. The diff engine must handle these
+		// correctly without splitting surrogate pairs.
+
+		it( 'should handle diff with emoji in unchanged prefix', () => {
+			// '😀' -> '😀x' — append 'x' after emoji
+			const oldDelta = new Delta().insert( '😀' );
+			const newDelta = new Delta().insert( '😀x' );
+
+			const diff = oldDelta.diff( newDelta );
+
+			// 😀 is 2 UTF-16 code units, so retain 2, insert 'x'
+			expect( diff.ops ).toEqual( [ { retain: 2 }, { insert: 'x' } ] );
+		} );
+
+		it( 'should handle diff replacing text after emoji', () => {
+			// 'a😀b' -> 'a😀c'
+			const oldDelta = new Delta().insert( 'a😀b' );
+			const newDelta = new Delta().insert( 'a😀c' );
+
+			const diff = oldDelta.diff( newDelta );
+
+			// retain 3 (a + 😀 = 1 + 2), then replace b with c
+			expect( diff.ops ).toEqual( [
+				{ retain: 3 },
+				{ insert: 'c' },
+				{ delete: 1 },
+			] );
+		} );
+
+		it( 'should handle diffWithCursor inserting text after emoji', () => {
+			// 'a😀b' -> 'a😀xb' with cursor at 4 (a=1, 😀=2, x=1)
+			const oldDelta = new Delta().insert( 'a😀b' );
+			const newDelta = new Delta().insert( 'a😀xb' );
+			const cursor = 4;
+
+			const diff = oldDelta.diffWithCursor( newDelta, cursor );
+
+			expect( diff.ops ).toEqual( [
+				{ retain: 3 }, // a(1) + 😀(2)
+				{ insert: 'x' },
+			] );
+		} );
+
+		it( 'should handle diffWithCursor inserting an emoji', () => {
+			// 'ab' -> 'a😀b' with cursor at 3 (a=1, 😀=2)
+			const oldDelta = new Delta().insert( 'ab' );
+			const newDelta = new Delta().insert( 'a😀b' );
+			const cursor = 3;
+
+			const diff = oldDelta.diffWithCursor( newDelta, cursor );
+
+			expect( diff.ops ).toEqual( [ { retain: 1 }, { insert: '😀' } ] );
+		} );
+
+		it( 'should handle diffWithCursor deleting an emoji', () => {
+			// 'a😀b' -> 'ab' with cursor at 1 (after 'a', emoji deleted)
+			const oldDelta = new Delta().insert( 'a😀b' );
+			const newDelta = new Delta().insert( 'ab' );
+			const cursor = 1;
+
+			const diff = oldDelta.diffWithCursor( newDelta, cursor );
+
+			expect( diff.ops ).toEqual( [
+				{ retain: 1 },
+				{ delete: 2 }, // 😀 is 2 UTF-16 code units
+			] );
+		} );
+
+		it( 'should handle inserting between two emoji', () => {
+			// '😀😀' -> '😀x😀' with cursor at 3 (😀=2, x=1)
+			const oldDelta = new Delta().insert( '😀😀' );
+			const newDelta = new Delta().insert( '😀x😀' );
+			const cursor = 3;
+
+			const diff = oldDelta.diffWithCursor( newDelta, cursor );
+
+			expect( diff.ops ).toEqual( [
+				{ retain: 2 }, // first 😀
+				{ insert: 'x' },
+			] );
+		} );
+
+		it( 'should handle diff with emoji-only strings', () => {
+			// '😀🎉' -> '😀🚀🎉' — insert 🚀 between two emoji
+			const oldDelta = new Delta().insert( '😀🎉' );
+			const newDelta = new Delta().insert( '😀🚀🎉' );
+
+			const diff = oldDelta.diff( newDelta );
+
+			expect( diff.ops ).toEqual( [
+				{ retain: 2 }, // 😀
+				{ insert: '🚀' },
+			] );
+		} );
+
+		it( 'should preserve emoji when diffing identical strings', () => {
+			const oldDelta = new Delta().insert( 'Hello 😀 World' );
+			const newDelta = new Delta().insert( 'Hello 😀 World' );
+
+			const diff = oldDelta.diff( newDelta );
+
+			expect( diff.ops ).toEqual( [] );
+		} );
+
+		it( 'should handle diff with mixed emoji and regular text changes', () => {
+			// 'Hello 😀 World' -> 'Hello 😀 Beautiful World'
+			const oldDelta = new Delta().insert( 'Hello 😀 World' );
+			const newDelta = new Delta().insert( 'Hello 😀 Beautiful World' );
+
+			const diff = oldDelta.diff( newDelta );
+
+			// 'Hello 😀 ' is 6+2+1 = 9 UTF-16 code units
+			expect( diff.ops ).toEqual( [
+				{ retain: 9 },
+				{ insert: 'Beautiful ' },
+			] );
+		} );
+
+		it( 'should handle compound emoji (flag emoji)', () => {
+			// Flag emoji like 🏳️‍🌈 are compound and has .length === 6 in JavaScript
+			const oldDelta = new Delta().insert( 'a🏳️‍🌈b' );
+			const newDelta = new Delta().insert( 'a🏳️‍🌈xb' );
+
+			const diff = oldDelta.diff( newDelta );
+
+			// a(1) + 🏳️‍🌈 (6) = 7 code units to retain
+			expect( diff.ops ).toEqual( [ { retain: 7 }, { insert: 'x' } ] );
+		} );
+
+		it( 'should handle emoji with skin tone modifier', () => {
+			// 👋🏽 is base emoji + skin tone modifier, .length === 4
+			const oldDelta = new Delta().insert( 'Hi 👋🏽' );
+			const newDelta = new Delta().insert( 'Hi 👋🏽!' );
+
+			const diff = oldDelta.diff( newDelta );
+
+			// 'Hi '(3) + '👋🏽'(4) = 7 code units to retain
+			expect( diff.ops ).toEqual( [ { retain: 7 }, { insert: '!' } ] );
+		} );
+	} );
+
+	describe( 'supplementary plane characters (non-emoji)', () => {
+		// Characters in the supplementary Unicode planes (U+10000+) are stored
+		// as surrogate pairs in UTF-16, so .length === 2 per character. The
+		// diff library v8 counts them as 1 grapheme cluster via Intl.Segmenter,
+		// causing the same mismatch as emoji.
+
+		it( 'should handle CJK Extension B characters (rare kanji)', () => {
+			// 𠮷 (U+20BB7) is a real kanji used in Japanese names (𠮷野家).
+			// It's in the supplementary plane: .length === 2 (surrogate pair).
+			const oldDelta = new Delta().insert( '𠮷野家' );
+			const newDelta = new Delta().insert( '𠮷野家は美味しい' );
+
+			const diff = oldDelta.diff( newDelta );
+
+			// '𠮷'(2) + '野'(1) + '家'(1) = 4 code units to retain
+			expect( diff.ops ).toEqual( [
+				{ retain: 4 },
+				{ insert: 'は美味しい' },
+			] );
+		} );
+
+		it( 'should handle diffWithCursor inserting after CJK Extension B character', () => {
+			// 'a𠮷b' -> 'a𠮷xb'
+			const oldDelta = new Delta().insert( 'a𠮷b' );
+			const newDelta = new Delta().insert( 'a𠮷xb' );
+			const cursor = 4; // a(1) + 𠮷(2) + x(1)
+
+			const diff = oldDelta.diffWithCursor( newDelta, cursor );
+
+			expect( diff.ops ).toEqual( [
+				{ retain: 3 }, // a(1) + 𠮷(2)
+				{ insert: 'x' },
+			] );
+		} );
+
+		it( 'should handle mathematical symbols from supplementary plane', () => {
+			// 𝐀 (U+1D400, Mathematical Bold Capital A) — .length === 2
+			const oldDelta = new Delta().insert( 'Let 𝐀 be a matrix' );
+			const newDelta = new Delta().insert( 'Let 𝐀 be a square matrix' );
+
+			const diff = oldDelta.diff( newDelta );
+
+			// 'Let 𝐀 be a ' = L(1)+e(1)+t(1)+' '(1)+𝐀(2)+' '(1)+b(1)+e(1)+' '(1)+a(1)+' '(1) = 12
+			expect( diff.ops ).toEqual( [
+				{ retain: 12 },
+				{ insert: 'square ' },
+			] );
+		} );
+
+		it( 'should handle mixed surrogate pairs and BMP text', () => {
+			// Mix of supplementary plane characters in one string.
+			// '𠮷' (CJK Ext B, surrogate pair) + '😀' (emoji, surrogate pair)
+			const oldDelta = new Delta().insert( '𠮷😀' );
+			const newDelta = new Delta().insert( '𠮷😀!' );
+
+			const diff = oldDelta.diff( newDelta );
+
+			// 𠮷(2) + 😀(2) = 4 code units
+			expect( diff.ops ).toEqual( [ { retain: 4 }, { insert: '!' } ] );
+		} );
+
+		it( 'should handle musical symbols', () => {
+			// 𝄞 (U+1D11E, Musical Symbol G Clef) — .length === 2
+			const oldDelta = new Delta().insert( 'Play 𝄞 in C' );
+			const newDelta = new Delta().insert( 'Play 𝄞 in D' );
+
+			const diff = oldDelta.diff( newDelta );
+
+			// 'Play 𝄞 in ' = P(1)+l(1)+a(1)+y(1)+' '(1)+𝄞(2)+' '(1)+i(1)+n(1)+' '(1) = 11
+			expect( diff.ops ).toEqual( [
+				{ retain: 11 },
+				{ insert: 'D' },
+				{ delete: 1 },
+			] );
+		} );
+
+		it( 'should handle ancient script characters (Egyptian hieroglyphs)', () => {
+			// 𓀀 (U+13000, Egyptian Hieroglyph A001) — .length === 2
+			const oldDelta = new Delta().insert( 'a𓀀b' );
+			const newDelta = new Delta().insert( 'a𓀀xb' );
+
+			const diff = oldDelta.diff( newDelta );
+
+			// a(1) + 𓀀(2) = 3 code units to retain
+			expect( diff.ops ).toEqual( [ { retain: 3 }, { insert: 'x' } ] );
+		} );
+	} );
 } );

src/test/utils.ts

@@ -11,7 +11,15 @@ /**
  */
-import { createYjsDoc, serializeCrdtDoc, deserializeCrdtDoc } from '../utils';
 import {
+	createYjsDoc,
+	initializeYjsDoc,
+	markEntityAsSaved,
+	serializeCrdtDoc,
+	deserializeCrdtDoc,
+} from '../utils';
+import {
 	CRDT_DOC_META_PERSISTENCE_KEY,
 	CRDT_DOC_VERSION,
 	CRDT_STATE_MAP_KEY,
+	CRDT_STATE_MAP_SAVED_AT_KEY as SAVED_AT_KEY,
+	CRDT_STATE_MAP_SAVED_BY_KEY as SAVED_BY_KEY,
 	CRDT_STATE_MAP_VERSION_KEY as VERSION_KEY,
@@ -44,10 +52,80 @@ } from '../config';
 
+		it( 'does not advance the state vector when creating the doc', () => {
+			const ydoc = createYjsDoc();
+			const sv = Y.decodeStateVector( Y.encodeStateVector( ydoc ) );
+
+			// createYjsDoc does not make any updates to the doc, so the state
+			// vector for the doc's client ID should be undefined.
+			expect( sv.get( ydoc.clientID ) ).toBeUndefined();
+		} );
+	} );
+
+	describe( 'initializeYjsDoc', () => {
 		it( 'sets the CRDT document version in the state map', () => {
-			const ydoc = createYjsDoc( {} );
+			const ydoc = new Y.Doc( {} );
 			const stateMap = ydoc.getMap( CRDT_STATE_MAP_KEY );
 
+			initializeYjsDoc( ydoc );
+
 			expect( stateMap.get( VERSION_KEY ) ).toBe( CRDT_DOC_VERSION );
 		} );
+
+		it( 'advances the state vector when setting the version key', () => {
+			const ydoc = new Y.Doc();
+
+			initializeYjsDoc( ydoc );
+
+			const sv = Y.decodeStateVector( Y.encodeStateVector( ydoc ) );
+
+			// createYjsDoc sets VERSION_KEY via stateMap.set(), which creates
+			// a Yjs operation. This advances the state vector for the doc's
+			// client ID to clock 1.
+			expect( sv.get( ydoc.clientID ) ).toBe( 1 );
+		} );
+
+		it( 'fires an update event when setting the version key', () => {
+			const updates: Uint8Array[] = [];
+			const ydoc = new Y.Doc();
+
+			ydoc.on( 'update', ( update: Uint8Array ) => {
+				updates.push( update );
+			} );
+
+			initializeYjsDoc( ydoc );
+
+			expect( updates ).toHaveLength( 1 );
+		} );
 	} );
 
+	describe( 'markEntityAsSaved', () => {
+		it( 'sets the saved-at timestamp and saved-by client ID', () => {
+			const ydoc = createYjsDoc();
+			const before = Date.now();
+
+			markEntityAsSaved( ydoc );
+
+			const stateMap = ydoc.getMap( CRDT_STATE_MAP_KEY );
+			const savedAt = stateMap.get( SAVED_AT_KEY ) as number;
+			const savedBy = stateMap.get( SAVED_BY_KEY );
+
+			expect( savedAt ).toBeGreaterThanOrEqual( before );
+			expect( savedAt ).toBeLessThanOrEqual( Date.now() );
+			expect( savedBy ).toBe( ydoc.clientID );
+		} );
+
+		it( 'updates the timestamp on subsequent calls', () => {
+			const ydoc = createYjsDoc();
+
+			markEntityAsSaved( ydoc );
+			const stateMap = ydoc.getMap( CRDT_STATE_MAP_KEY );
+			const firstSavedAt = stateMap.get( SAVED_AT_KEY ) as number;
+
+			// Small delay to ensure timestamp changes.
+			markEntityAsSaved( ydoc );
+			const secondSavedAt = stateMap.get( SAVED_AT_KEY ) as number;
+
+			expect( secondSavedAt ).toBeGreaterThanOrEqual( firstSavedAt );
+		} );
+	} );
+
 	describe( 'serializeCrdtDoc', () => {
@@ -80,2 +158,4 @@ let testDoc: Y.Doc;
 			originalDoc = createYjsDoc();
+			initializeYjsDoc( originalDoc );
+
 			const ymap = originalDoc.getMap( 'testMap' );
@@ -82,0 +162,0 @@ ymap.set( 'title', 'Test Title' );

src/types.ts

@@ -78,13 +78,25 @@ /**
 /**
- * Current connection status of a sync provider, including status and optional error information.
+ * Current connection status of a sync provider.
  */
-export interface ConnectionStatus {
-	status: 'connected' | 'connecting' | 'disconnected';
+export interface ConnectionStatusConnected {
+	status: 'connected';
+}
 
-	/**
-	 * Optional error information when status is 'disconnected'.
-	 */
+export interface ConnectionStatusConnecting {
+	status: 'connecting';
+}
+
+export interface ConnectionStatusDisconnected {
+	status: 'disconnected';
+	/** Optional error information. */
 	error?: ConnectionError;
+	/** Milliseconds until the next automatic retry attempt. */
+	retryInMs?: number;
 }
 
+export type ConnectionStatus =
+	| ConnectionStatusConnected
+	| ConnectionStatusConnecting
+	| ConnectionStatusDisconnected;
+
 export type OnStatusChangeCallback = (
@@ -151,3 +163,3 @@ status: ConnectionStatus | null
 		objectId: ObjectID
-	) => string | null;
+	) => Promise< string | null >;
 	getAwareness: < State extends Awareness >(
@@ -154,0 +166,0 @@ objectType: ObjectType,

src/utils.ts

@@ -24,3 +24,9 @@ /**
 
-export function createYjsDoc( documentMeta: DocumentMeta = {} ): Y.Doc {
+/**
+ * Creates a new Y.Doc instance with the given document metadata.
+ *
+ * @param {DocumentMeta} documentMeta Optional metadata to associate with the
+ *                                    document. Metadata is not persisted.
+ */
+export function createYjsDoc( documentMeta: DocumentMeta = {} ): CRDTDoc {
 	// Convert the object representation of CRDT document metadata to a map.
@@ -34,8 +40,15 @@ // Document metadata is passed to the Y.Doc constructor and stored in its
 
-	const ydoc = new Y.Doc( { meta: metaMap } );
+	// IMPORTANT: Do not add update the document itself to avoid generating updates
+	// before observers are attached. Add initial updates in `initializeYjsDoc`.
+	return new Y.Doc( { meta: metaMap } );
+}
+
+/**
+ * Initializes a Y.Doc instance with the necessary CRDT state for our use case.
+ *
+ * @param {Y.Doc} ydoc Y.Doc instance to initialize.
+ */
+export function initializeYjsDoc( ydoc: CRDTDoc ): void {
 	const stateMap = ydoc.getMap( CRDT_STATE_MAP_KEY );
-
 	stateMap.set( VERSION_KEY, CRDT_DOC_VERSION );
-
-	return ydoc;
 }
@@ -42,0 +55,0 @@

New alerts

Network access

Supply chain risk

This module accesses the network.

Found 1 instance in 1 package

Long strings

Supply chain risk

Contains long string literals, which may be a sign of obfuscated or packed code.

Found 1 instance in 1 package

Fixed alerts

Manifest confusion

Supply chain risk

This package has inconsistent metadata. This could be malicious or caused by an error when publishing the package.

Found 1 instance in 1 package

Network access

Supply chain risk

This module accesses the network.

Found 1 instance in 1 package

Long strings

Supply chain risk

Contains long string literals, which may be a sign of obfuscated or packed code.

Found 1 instance in 1 package

No v1

Quality

Package is not semver >=1. This means it is not stable and does not support ^ ranges.

Found 1 instance in 1 package

Improved metrics

Total package byte prevSize

754944

3.82%

Number of package files

163

1.88%

Lines of code

11348

5.19%

Number of low quality alerts

0

-100%

Number of medium supply chain risk alerts

6

-14.29%

Dependency changes

• Updated

  @wordpress/api-fetch@^7.41.0

• Updated

  @wordpress/hooks@^4.41.0

• Updated

  @wordpress/private-apis@^1.41.0

• Updated

  @wordpress/undo-manager@^1.41.0