@tanstack/db
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A reactive client store for building super fast apps on sync
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{"version":3,"file":"state.cjs","sources":["../../../src/collection/state.ts"],"sourcesContent":["import { deepEquals } from '../utils'\nimport { SortedMap } from '../SortedMap'\nimport { enrichRowWithVirtualProps } from '../virtual-props.js'\nimport { SyncTransactionAbortedError } from '../errors.js'\nimport { DIRECT_TRANSACTION_METADATA_KEY } from './transaction-metadata.js'\nimport type {\n VirtualOrigin,\n VirtualRowProps,\n WithVirtualProps,\n} from '../virtual-props.js'\nimport type { Transaction } from '../transactions'\nimport type { StandardSchemaV1 } from '@standard-schema/spec'\nimport type {\n ChangeMessage,\n CollectionConfig,\n OptimisticChangeMessage,\n PendingMutation,\n} from '../types'\nimport type { CollectionImpl } from './index.js'\nimport type { CollectionLifecycleManager } from './lifecycle'\nimport type { CollectionChangesManager } from './changes'\nimport type { CollectionIndexesManager } from './indexes'\nimport type { CollectionEventsManager } from './events'\nimport type { Deferred } from '../deferred'\nimport type { DuplicateKeySyncError } from '../errors.js'\n\ntype PendingSyncOperation<\n T extends object,\n TKey extends string | number,\n> = OptimisticChangeMessage<T, TKey> & {\n /** Preserve adapter intent when queue changes require reclassification. */\n originalSyncType?: `insert`\n /** A partial update admitted against a row must not become an upsert. */\n admittedAgainstExistingRow?: boolean\n}\n\ntype PendingSyncedKeyState<T extends object> = {\n exists: boolean\n value: T | undefined\n}\n\ntype PendingSyncedProjection<T extends object, TKey extends string | number> = {\n states: Map<TKey, PendingSyncedKeyState<T>>\n truncated: boolean\n}\n\ntype PendingInsertDisposition = `insert` | `update` | `duplicate`\n\ninterface PendingSyncedTransaction<\n T extends object = Record<string, unknown>,\n TKey extends string | number = string | number,\n> {\n committed: boolean\n applicationStarted: boolean\n layoutChanged: boolean\n operations: Array<PendingSyncOperation<T, TKey>>\n truncate?: boolean\n rowMetadataWrites: Map<TKey, PendingMetadataWrite>\n explicitRowMetadataWriteKeys?: Set<TKey>\n collectionMetadataWrites: Map<string, PendingMetadataWrite>\n /** Resolves after application and rejects if canceled before application. */\n applied: Deferred<void>\n optimisticSnapshot?: {\n upserts: Map<TKey, T>\n deletes: Set<TKey>\n ownership: Map<\n TKey,\n Array<\n | { type: `upsert`; value: T; transaction?: Transaction<any> }\n | { type: `delete`; transaction?: Transaction<any> }\n >\n >\n }\n preserveHydrationSeedKeys?: boolean\n /** Present on adapter transactions that can be revalidated after cancel. */\n duplicateKeyError?: (key: TKey) => DuplicateKeySyncError\n /** Retained until commit so an invalidated active transaction stays addressable. */\n invalidationError?: Error\n /**\n * When true, this transaction should be processed immediately even if there\n * are persisting user transactions. Used by manual write operations (writeInsert,\n * writeUpdate, writeDelete, writeUpsert) which need synchronous updates to syncedData.\n */\n immediate?: boolean\n}\n\ntype PendingMetadataWrite = { type: `set`; value: unknown } | { type: `delete` }\n\ntype InsertDependency = { mutation: object; transaction: Transaction<any> }\n\ntype OptimisticUpsert<T extends object> = Pick<\n PendingMutation<T>,\n `key` | `modified`\n> & { insertDependency?: InsertDependency }\n\ntype InternalChangeMessage<\n T extends object = Record<string, unknown>,\n TKey extends string | number = string | number,\n> = ChangeMessage<T, TKey> & {\n __virtualProps?: {\n value?: VirtualRowProps<TKey>\n previousValue?: VirtualRowProps<TKey>\n }\n}\nexport class CollectionStateManager<\n TOutput extends object = Record<string, unknown>,\n TKey extends string | number = string | number,\n TSchema extends StandardSchemaV1 = StandardSchemaV1,\n TInput extends object = TOutput,\n> {\n public config!: CollectionConfig<TOutput, TKey, TSchema, any>\n public collection!: CollectionImpl<TOutput, TKey, any, TSchema, TInput>\n public lifecycle!: CollectionLifecycleManager<TOutput, TKey, TSchema, TInput>\n public changes!: CollectionChangesManager<TOutput, TKey, TSchema, TInput>\n public indexes!: CollectionIndexesManager<TOutput, TKey, TSchema, TInput>\n private _events!: CollectionEventsManager\n\n // Core state - make public for testing\n public transactions: SortedMap<string, Transaction<any>>\n public pendingSyncedTransactions: Array<\n PendingSyncedTransaction<TOutput, TKey>\n > = []\n private pendingSyncedProjection: PendingSyncedProjection<TOutput, TKey> = {\n states: new Map(),\n truncated: false,\n }\n public syncedData: SortedMap<TKey, TOutput>\n public syncedMetadata = new Map<TKey, unknown>()\n public syncedCollectionMetadata = new Map<string, unknown>()\n public hydrationSeedKeys = new Set<TKey>()\n public hydratedKeys = new Set<TKey>()\n // DbClient may receive a stale hydration chunk after an adapter delete.\n // Only DbClient collections retain these absences until cleanup because\n // hydration has no completion boundary.\n private appliedAdapterDeletedKeys?: Set<TKey>\n private hasAppliedAdapterTruncate = false\n\n // Optimistic state tracking - make public for testing\n public optimisticUpserts = new Map<TKey, TOutput>()\n public optimisticDeletes = new Set<TKey>()\n\n public pendingOptimisticUpserts = new Map<TKey, OptimisticUpsert<TOutput>>()\n public pendingOptimisticDeletes = new Set<TKey>()\n public pendingOptimisticDirectUpserts = new Set<TKey>()\n public pendingOptimisticDirectDeletes = new Set<TKey>()\n private acknowledgedInserts = new WeakSet<object>()\n\n /**\n * Tracks the origin of confirmed changes for each row.\n * 'local' = change originated from this client\n * 'remote' = change was received via sync\n *\n * This is used for the $origin virtual property.\n * Note: This only tracks *confirmed* changes, not optimistic ones.\n * Optimistic changes are always considered 'local' for $origin.\n */\n public rowOrigins = new Map<TKey, VirtualOrigin>()\n\n /**\n * Tracks keys that have pending local changes.\n * Used to determine whether sync-confirmed data should have 'local' or 'remote' origin.\n * When sync confirms data for a key with pending local changes, it keeps 'local' origin.\n */\n public pendingLocalChanges = new Set<TKey>()\n // Successful mutations retain attribution until sync applies. Active or\n // failed mutations must not add to, or erase a sibling's entry in, this set.\n public pendingLocalOrigins = new Set<TKey>()\n\n private virtualPropsCache = new WeakMap<\n object,\n {\n synced: boolean\n origin: VirtualOrigin\n key: TKey\n collectionId: string\n enriched: WithVirtualProps<TOutput, TKey>\n }\n >()\n\n // Cached size for performance\n public size = 0\n\n // State used for computing the change events\n // Hidden keys are captured as undefined so a later recompute cannot become\n // the baseline for a sync commit that must publish that key's change.\n public preSyncVisibleState = new Map<TKey, TOutput | undefined>()\n public preSyncVirtualState = new Map<TKey, VirtualRowProps<TKey>>()\n public recentlySyncedKeys = new Set<TKey>()\n public hasReceivedFirstCommit = false\n public isCommittingSyncTransactions = false\n private isDrainingSyncTransactions = false\n private syncRunGeneration = 0\n public isLocalOnly = false\n\n /**\n * Creates a new CollectionState manager\n */\n constructor(config: CollectionConfig<TOutput, TKey, TSchema, any>) {\n this.config = config\n this.transactions = new SortedMap<string, Transaction<any>>((a, b) =>\n a.compareCreatedAt(b),\n )\n\n // Set up data storage - always use SortedMap for deterministic iteration.\n // If a custom compare function is provided, use it; otherwise entries are sorted by key only.\n this.syncedData = new SortedMap<TKey, TOutput>(config.compare)\n }\n\n setDeps(deps: {\n collection: CollectionImpl<TOutput, TKey, any, TSchema, TInput>\n lifecycle: CollectionLifecycleManager<TOutput, TKey, TSchema, TInput>\n changes: CollectionChangesManager<TOutput, TKey, TSchema, TInput>\n indexes: CollectionIndexesManager<TOutput, TKey, TSchema, TInput>\n events: CollectionEventsManager\n }) {\n this.collection = deps.collection\n this.lifecycle = deps.lifecycle\n this.changes = deps.changes\n this.indexes = deps.indexes\n this._events = deps.events\n }\n\n /**\n * Checks whether this row currently has no pending local optimistic writes.\n *\n * This is local mutation status, not backend confirmation: `true` means the\n * row is not currently affected by an optimistic transaction in this\n * collection's visible state.\n *\n * Used to compute the $synced virtual property.\n */\n public isRowSynced(key: TKey): boolean {\n if (this.isLocalOnly) {\n return true\n }\n return !this.optimisticUpserts.has(key) && !this.optimisticDeletes.has(key)\n }\n\n /**\n * Gets the origin of the last confirmed change to a row.\n * Returns 'local' if the row has optimistic mutations (optimistic changes are local).\n * Used to compute the $origin virtual property.\n */\n public getRowOrigin(key: TKey): VirtualOrigin {\n if (this.isLocalOnly) {\n return 'local'\n }\n // If there are optimistic changes, they're local\n if (this.optimisticUpserts.has(key) || this.optimisticDeletes.has(key)) {\n return 'local'\n }\n // Otherwise, return the confirmed origin (defaults to 'remote' for synced data)\n return this.rowOrigins.get(key) ?? 'remote'\n }\n\n private createVirtualPropsSnapshot(\n key: TKey,\n overrides?: Partial<VirtualRowProps<TKey>>,\n ): VirtualRowProps<TKey> {\n return {\n $synced: overrides?.$synced ?? this.isRowSynced(key),\n $origin: overrides?.$origin ?? this.getRowOrigin(key),\n $key: overrides?.$key ?? key,\n $collectionId: overrides?.$collectionId ?? this.collection.id,\n }\n }\n\n private getVirtualPropsSnapshotForState(\n key: TKey,\n options?: {\n rowOrigins?: ReadonlyMap<TKey, VirtualOrigin>\n optimisticUpserts?: Pick<Map<TKey, unknown>, 'has'>\n optimisticDeletes?: Pick<Set<TKey>, 'has'>\n completedOptimisticKeys?: Pick<Map<TKey, unknown>, 'has'>\n },\n ): VirtualRowProps<TKey> {\n if (this.isLocalOnly) {\n return this.createVirtualPropsSnapshot(key, {\n $synced: true,\n $origin: 'local',\n })\n }\n\n const optimisticUpserts =\n options?.optimisticUpserts ?? this.optimisticUpserts\n const optimisticDeletes =\n options?.optimisticDeletes ?? this.optimisticDeletes\n const hasOptimisticChange =\n optimisticUpserts.has(key) ||\n optimisticDeletes.has(key) ||\n options?.completedOptimisticKeys?.has(key) === true\n\n return this.createVirtualPropsSnapshot(key, {\n $synced: !hasOptimisticChange,\n $origin: hasOptimisticChange\n ? 'local'\n : ((options?.rowOrigins ?? this.rowOrigins).get(key) ?? 'remote'),\n })\n }\n\n private snapshotRowOriginsForKeys(\n keys: Iterable<TKey>,\n ): Map<TKey, VirtualOrigin> {\n const rowOrigins = new Map<TKey, VirtualOrigin>()\n\n for (const key of keys) {\n const origin = this.rowOrigins.get(key)\n if (origin !== undefined) {\n rowOrigins.set(key, origin)\n }\n }\n\n return rowOrigins\n }\n\n private enrichWithVirtualPropsSnapshot(\n row: TOutput,\n virtualProps: VirtualRowProps<TKey>,\n ): WithVirtualProps<TOutput, TKey> {\n const existingRow = row as Partial<WithVirtualProps<TOutput, TKey>>\n const synced = existingRow.$synced ?? virtualProps.$synced\n const origin = existingRow.$origin ?? virtualProps.$origin\n const resolvedKey = existingRow.$key ?? virtualProps.$key\n const collectionId = existingRow.$collectionId ?? virtualProps.$collectionId\n\n const cached = this.virtualPropsCache.get(row as object)\n if (\n cached &&\n cached.synced === synced &&\n cached.origin === origin &&\n cached.key === resolvedKey &&\n cached.collectionId === collectionId\n ) {\n return cached.enriched\n }\n\n const enriched = {\n ...row,\n $synced: synced,\n $origin: origin,\n $key: resolvedKey,\n $collectionId: collectionId,\n } as WithVirtualProps<TOutput, TKey>\n\n this.virtualPropsCache.set(row as object, {\n synced,\n origin,\n key: resolvedKey,\n collectionId,\n enriched,\n })\n\n return enriched\n }\n\n private clearOriginTrackingState(): void {\n this.rowOrigins.clear()\n this.pendingLocalChanges.clear()\n this.pendingLocalOrigins.clear()\n }\n\n /**\n * Enriches a row with virtual properties using the \"add-if-missing\" pattern.\n * If the row already has virtual properties (from an upstream collection),\n * they are preserved. Otherwise, new values are computed.\n */\n public enrichWithVirtualProps(\n row: TOutput,\n key: TKey,\n ): WithVirtualProps<TOutput, TKey> {\n return this.enrichWithVirtualPropsSnapshot(\n row,\n this.createVirtualPropsSnapshot(key),\n )\n }\n\n /**\n * Creates a change message with virtual properties.\n * Uses the \"add-if-missing\" pattern so that pass-through from upstream\n * collections works correctly.\n */\n public enrichChangeMessage(\n change: ChangeMessage<TOutput, TKey>,\n ): ChangeMessage<WithVirtualProps<TOutput, TKey>, TKey> {\n const { __virtualProps } = change as InternalChangeMessage<TOutput, TKey>\n const enrichedValue = __virtualProps?.value\n ? this.enrichWithVirtualPropsSnapshot(change.value, __virtualProps.value)\n : this.enrichWithVirtualProps(change.value, change.key)\n const enrichedPreviousValue = change.previousValue\n ? __virtualProps?.previousValue\n ? this.enrichWithVirtualPropsSnapshot(\n change.previousValue,\n __virtualProps.previousValue,\n )\n : this.enrichWithVirtualProps(change.previousValue, change.key)\n : undefined\n\n return {\n key: change.key,\n type: change.type,\n value: enrichedValue,\n previousValue: enrichedPreviousValue,\n metadata: change.metadata,\n } as ChangeMessage<WithVirtualProps<TOutput, TKey>, TKey>\n }\n\n /**\n * Get the current value for a key enriched with virtual properties.\n */\n public getWithVirtualProps(\n key: TKey,\n ): WithVirtualProps<TOutput, TKey> | undefined {\n const value = this.get(key)\n if (value === undefined) {\n return undefined\n }\n return this.enrichWithVirtualProps(value, key)\n }\n\n /**\n * Get the current value for a key (virtual derived state)\n */\n public get(key: TKey): TOutput | undefined {\n const { optimisticDeletes, optimisticUpserts, syncedData } = this\n // Check if optimistically deleted\n if (optimisticDeletes.has(key)) {\n return undefined\n }\n\n // Check optimistic upserts first\n if (optimisticUpserts.has(key)) {\n return optimisticUpserts.get(key)\n }\n\n // Fall back to synced data\n return syncedData.get(key)\n }\n\n /**\n * Check if a key exists in the collection (virtual derived state)\n */\n public has(key: TKey): boolean {\n const { optimisticDeletes, optimisticUpserts, syncedData } = this\n // Check if optimistically deleted\n if (optimisticDeletes.has(key)) {\n return false\n }\n\n // Check optimistic upserts first\n if (optimisticUpserts.has(key)) {\n return true\n }\n\n // Fall back to synced data\n return syncedData.has(key)\n }\n\n /**\n * Get all keys (virtual derived state)\n */\n public *keys(): IterableIterator<TKey> {\n const { syncedData, optimisticDeletes, optimisticUpserts } = this\n // Yield keys from synced data, skipping any that are deleted.\n for (const key of syncedData.keys()) {\n if (!optimisticDeletes.has(key)) {\n yield key\n }\n }\n // Yield keys from upserts that were not already in synced data.\n for (const key of optimisticUpserts.keys()) {\n if (!syncedData.has(key) && !optimisticDeletes.has(key)) {\n // The optimisticDeletes check is technically redundant if inserts/updates always remove from deletes,\n // but it's safer to keep it.\n yield key\n }\n }\n }\n\n /**\n * Get all values (virtual derived state)\n */\n public *values(): IterableIterator<TOutput> {\n for (const key of this.keys()) {\n const value = this.get(key)\n if (value !== undefined) {\n yield value\n }\n }\n }\n\n /**\n * Get all entries (virtual derived state)\n */\n public *entries(): IterableIterator<[TKey, TOutput]> {\n for (const key of this.keys()) {\n const value = this.get(key)\n if (value !== undefined) {\n yield [key, value]\n }\n }\n }\n\n /**\n * Get all entries (virtual derived state)\n */\n public *[Symbol.iterator](): IterableIterator<[TKey, TOutput]> {\n for (const [key, value] of this.entries()) {\n yield [key, value]\n }\n }\n\n /**\n * Execute a callback for each entry in the collection\n */\n public forEach(\n callbackfn: (value: TOutput, key: TKey, index: number) => void,\n ): void {\n let index = 0\n for (const [key, value] of this.entries()) {\n callbackfn(value, key, index++)\n }\n }\n\n /**\n * Create a new array with the results of calling a function for each entry in the collection\n */\n public map<U>(\n callbackfn: (value: TOutput, key: TKey, index: number) => U,\n ): Array<U> {\n const result: Array<U> = []\n let index = 0\n for (const [key, value] of this.entries()) {\n result.push(callbackfn(value, key, index++))\n }\n return result\n }\n\n /**\n * Check if the given collection is this collection\n * @param collection The collection to check\n * @returns True if the given collection is this collection, false otherwise\n */\n private isThisCollection(\n collection: CollectionImpl<any, any, any, any, any>,\n ): boolean {\n return collection === this.collection\n }\n\n /**\n * Recompute optimistic state from active transactions\n */\n public recomputeOptimisticState(\n triggeredByUserAction: boolean = false,\n ): void {\n // Skip redundant recalculations when we're in the middle of committing sync transactions\n // While the sync pipeline is replaying a large batch we still want to honour\n // fresh optimistic mutations from the UI. Only skip recompute for the\n // internal sync-driven redraws; user-triggered work (triggeredByUserAction)\n // must run so live queries stay responsive during long commits.\n if (this.isCommittingSyncTransactions && !triggeredByUserAction) {\n return\n }\n\n const previousState = new Map(this.optimisticUpserts)\n const previousDeletes = new Set(this.optimisticDeletes)\n const previousRowOrigins = this.rowOrigins\n\n // A retained update can depend on an unconfirmed insert, not just its key.\n // Keep that exact dependency so settlement and key reuse cannot conflate rows.\n const pendingInserts = new Map<TKey, InsertDependency>()\n // Retain successful contributions; failed/active work is recomputed below.\n for (const transaction of this.transactions.values()) {\n const isDirectTransaction =\n transaction.metadata[DIRECT_TRANSACTION_METADATA_KEY] === true\n if (transaction.state === `completed`) {\n for (const mutation of transaction.mutations) {\n if (!this.isThisCollection(mutation.collection)) {\n continue\n }\n // Only a sync write during this insertion acknowledges it. A stale\n // base row can also exist after an optimistic delete and reinsert.\n if (\n isDirectTransaction &&\n mutation.type === `insert` &&\n this.acknowledgedInserts.has(mutation)\n ) {\n continue\n }\n this.pendingLocalOrigins.add(mutation.key)\n if (!mutation.optimistic) {\n continue\n }\n switch (mutation.type) {\n case `insert`:\n case `update`: {\n // Retain whole snapshots, not fields rebased over newer synced\n // values. A slow insert must not replace its accepted dependent\n // update with the older insertion snapshot.\n const previous = this.pendingOptimisticUpserts.get(mutation.key)\n const confirmsInsert =\n previous?.insertDependency?.mutation === mutation\n const insertDependency =\n mutation.type === `update`\n ? (previous?.insertDependency ??\n pendingInserts.get(mutation.key))\n : undefined\n this.pendingOptimisticUpserts.set(mutation.key, {\n key: mutation.key,\n modified: confirmsInsert\n ? previous.modified\n : mutation.modified,\n insertDependency,\n })\n // This accepted edit is conditional on the unconfirmed insert.\n // It cannot retire the accepted delete underneath that insert.\n if (!insertDependency) {\n this.pendingOptimisticDeletes.delete(mutation.key)\n this.pendingOptimisticDirectDeletes.delete(mutation.key)\n }\n if (isDirectTransaction) {\n this.pendingOptimisticDirectUpserts.add(mutation.key)\n } else {\n this.pendingOptimisticDirectUpserts.delete(mutation.key)\n }\n break\n }\n case `delete`: {\n // An accepted edit of a still-active reinsert belongs after this\n // older delete. Keep both layers so failure of the insert still\n // reveals the accepted delete.\n const hasDependentEdit =\n this.pendingOptimisticUpserts.get(mutation.key)\n ?.insertDependency !== undefined\n if (!hasDependentEdit) {\n this.pendingOptimisticUpserts.delete(mutation.key)\n this.pendingOptimisticDirectUpserts.delete(mutation.key)\n }\n this.pendingOptimisticDeletes.add(mutation.key)\n if (isDirectTransaction) {\n this.pendingOptimisticDirectDeletes.add(mutation.key)\n } else {\n this.pendingOptimisticDirectDeletes.delete(mutation.key)\n }\n break\n }\n }\n }\n } else {\n for (const mutation of transaction.mutations) {\n if (\n !this.isThisCollection(mutation.collection) ||\n mutation.type !== `insert` ||\n !mutation.optimistic\n )\n continue\n if (\n transaction.state !== `failed` &&\n !this.acknowledgedInserts.has(mutation)\n ) {\n pendingInserts.set(mutation.key, { mutation, transaction })\n } else if (\n this.pendingOptimisticUpserts.get(mutation.key)?.insertDependency\n ?.mutation === mutation\n ) {\n // Drop only the dependent row, never a later same-key insertion or\n // successful sibling attribution. Failed transactions remain listed.\n this.pendingOptimisticUpserts.delete(mutation.key)\n this.pendingOptimisticDirectUpserts.delete(mutation.key)\n }\n }\n }\n }\n\n // Clear current optimistic state\n this.optimisticUpserts.clear()\n this.optimisticDeletes.clear()\n this.pendingLocalChanges.clear()\n\n // Seed optimistic state with pending optimistic mutations only when a sync is pending\n const pendingSyncKeys = new Set<TKey>()\n for (const transaction of this.pendingSyncedTransactions) {\n for (const operation of transaction.operations) {\n pendingSyncKeys.add(operation.key as TKey)\n }\n }\n const staleOptimisticUpserts: Array<TKey> = []\n for (const [key, value] of this.pendingOptimisticUpserts) {\n if (\n pendingSyncKeys.has(key) ||\n this.pendingOptimisticDirectUpserts.has(key)\n ) {\n this.optimisticUpserts.set(key, this.resolveOptimisticUpsert(value))\n } else {\n staleOptimisticUpserts.push(key)\n }\n }\n for (const key of staleOptimisticUpserts) {\n this.pendingOptimisticUpserts.delete(key)\n this.pendingLocalOrigins.delete(key)\n }\n const staleOptimisticDeletes: Array<TKey> = []\n for (const key of this.pendingOptimisticDeletes) {\n if (\n pendingSyncKeys.has(key) ||\n this.pendingOptimisticDirectDeletes.has(key)\n ) {\n this.optimisticDeletes.add(key)\n } else {\n staleOptimisticDeletes.push(key)\n }\n }\n for (const key of staleOptimisticDeletes) {\n this.pendingOptimisticDeletes.delete(key)\n this.pendingLocalOrigins.delete(key)\n }\n\n const activeTransactions: Array<Transaction<any>> = []\n\n for (const transaction of this.transactions.values()) {\n if (![`completed`, `failed`].includes(transaction.state)) {\n activeTransactions.push(transaction)\n }\n }\n\n // Apply active transactions only (completed transactions are handled by sync operations)\n for (const transaction of activeTransactions) {\n for (const mutation of transaction.mutations) {\n if (!this.isThisCollection(mutation.collection)) {\n continue\n }\n\n // Track that this key has pending local changes for $origin tracking\n this.pendingLocalChanges.add(mutation.key)\n\n if (mutation.optimistic) {\n switch (mutation.type) {\n case `insert`:\n case `update`:\n this.optimisticUpserts.set(\n mutation.key,\n this.resolveOptimisticUpsert(mutation),\n )\n this.optimisticDeletes.delete(mutation.key)\n break\n case `delete`:\n this.optimisticUpserts.delete(mutation.key)\n this.optimisticDeletes.add(mutation.key)\n break\n }\n }\n }\n }\n\n // Update cached size\n this.size = this.calculateSize()\n\n // Collect events for changes\n const events: Array<InternalChangeMessage<TOutput, TKey>> = []\n this.collectOptimisticChanges(\n previousState,\n previousDeletes,\n previousRowOrigins,\n events,\n )\n\n // Filter out events for recently synced keys to prevent duplicates\n // BUT: Only filter out events that are actually from sync operations\n // New user transactions should NOT be filtered even if the key was recently synced\n const filteredEventsBySyncStatus = events.filter((event) => {\n if (!this.recentlySyncedKeys.has(event.key)) {\n return true // Key not recently synced, allow event through\n }\n\n // Key was recently synced - allow if this is a user-triggered action\n if (triggeredByUserAction) {\n return true\n }\n\n // Otherwise filter out duplicate sync events\n return false\n })\n\n // Filter out redundant delete events if there are pending sync transactions\n // that will immediately restore the same data, but only for completed transactions\n // IMPORTANT: Skip complex filtering for user-triggered actions to prevent UI blocking\n if (this.changes.shouldBatchEvents && !triggeredByUserAction) {\n const pendingSyncKeysForFilter = new Set<TKey>()\n\n // Collect keys from pending sync operations\n for (const transaction of this.pendingSyncedTransactions) {\n for (const operation of transaction.operations) {\n pendingSyncKeysForFilter.add(operation.key as TKey)\n }\n }\n\n // Only filter out delete events for keys that:\n // 1. Have pending sync operations AND\n // 2. Are from completed transactions (being cleaned up)\n const filteredEvents = filteredEventsBySyncStatus.filter((event) => {\n if (\n event.type === `delete` &&\n pendingSyncKeysForFilter.has(event.key)\n ) {\n // Check if this delete is from clearing optimistic state of completed transactions\n // We can infer this by checking if we have no remaining optimistic mutations for this key\n const hasActiveOptimisticMutation = activeTransactions.some((tx) =>\n tx.mutations.some(\n (m) => this.isThisCollection(m.collection) && m.key === event.key,\n ),\n )\n\n if (!hasActiveOptimisticMutation) {\n return false // Skip this delete event as sync will restore the data\n }\n }\n return true\n })\n\n // Update indexes for the filtered events\n if (filteredEvents.length > 0) {\n this.indexes.updateIndexes(filteredEvents)\n }\n this.changes.emitEvents(filteredEvents, triggeredByUserAction)\n } else {\n // Update indexes for all events\n if (filteredEventsBySyncStatus.length > 0) {\n this.indexes.updateIndexes(filteredEventsBySyncStatus)\n }\n // Emit all events if no pending sync transactions\n this.changes.emitEvents(filteredEventsBySyncStatus, triggeredByUserAction)\n }\n }\n\n /**\n * Calculate the current size based on synced data and optimistic changes\n */\n private calculateSize(): number {\n const syncedSize = this.syncedData.size\n const deletesFromSynced = Array.from(this.optimisticDeletes).filter(\n (key) => this.syncedData.has(key) && !this.optimisticUpserts.has(key),\n ).length\n const upsertsNotInSynced = Array.from(this.optimisticUpserts.keys()).filter(\n (key) => !this.syncedData.has(key),\n ).length\n\n return syncedSize - deletesFromSynced + upsertsNotInSynced\n }\n\n /**\n * Collect events for optimistic changes\n */\n private collectOptimisticChanges(\n previousUpserts: Map<TKey, TOutput>,\n previousDeletes: Set<TKey>,\n previousRowOrigins: ReadonlyMap<TKey, VirtualOrigin>,\n events: Array<InternalChangeMessage<TOutput, TKey>>,\n ): void {\n const allKeys = new Set([\n ...previousUpserts.keys(),\n ...this.optimisticUpserts.keys(),\n ...previousDeletes,\n ...this.optimisticDeletes,\n ])\n\n for (const key of allKeys) {\n const currentValue = this.get(key)\n const previousValue = this.getPreviousValue(\n key,\n previousUpserts,\n previousDeletes,\n )\n const previousVirtualProps = this.getVirtualPropsSnapshotForState(key, {\n rowOrigins: previousRowOrigins,\n optimisticUpserts: previousUpserts,\n optimisticDeletes: previousDeletes,\n })\n const nextVirtualProps = this.getVirtualPropsSnapshotForState(key)\n\n if (previousValue !== undefined && currentValue === undefined) {\n events.push({\n type: `delete`,\n key,\n value: previousValue,\n __virtualProps: {\n value: previousVirtualProps,\n },\n })\n } else if (previousValue === undefined && currentValue !== undefined) {\n events.push({\n type: `insert`,\n key,\n value: currentValue,\n __virtualProps: {\n value: nextVirtualProps,\n },\n })\n } else if (\n previousValue !== undefined &&\n currentValue !== undefined &&\n (!deepEquals(previousValue, currentValue) ||\n previousVirtualProps.$origin !== nextVirtualProps.$origin ||\n previousVirtualProps.$synced !== nextVirtualProps.$synced)\n ) {\n events.push({\n type: `update`,\n key,\n value: currentValue,\n previousValue,\n __virtualProps: {\n value: nextVirtualProps,\n previousValue: previousVirtualProps,\n },\n })\n }\n }\n }\n\n // Optimistic mutations keep their full validated snapshot. Mixing in newer\n // synced fields could produce a row neither the user nor the server created.\n private resolveOptimisticUpsert(\n mutation: OptimisticUpsert<TOutput>,\n ): TOutput {\n const key = mutation.key as TKey\n const dependent = this.pendingOptimisticUpserts.get(key)\n return dependent?.insertDependency?.mutation === mutation\n ? dependent.modified\n : mutation.modified\n }\n\n /**\n * Capture the optimistic layers that exist when a truncate is authored.\n * Keeping their exact owners lets application discard a later rollback\n * without reviving a failed same-key winner or retaining post-capture work.\n */\n public captureTruncateOptimisticSnapshot(): NonNullable<\n PendingSyncedTransaction<TOutput, TKey>[`optimisticSnapshot`]\n > {\n const upserts = new Map(this.optimisticUpserts)\n const deletes = new Set(this.optimisticDeletes)\n const ownership = new Map<\n TKey,\n Array<\n | {\n type: `upsert`\n value: TOutput\n transaction?: Transaction<any>\n }\n | { type: `delete`; transaction?: Transaction<any> }\n >\n >()\n const capturedKeys = new Set([...upserts.keys(), ...deletes])\n const addLayer = (\n key: TKey,\n layer:\n | {\n type: `upsert`\n value: TOutput\n transaction?: Transaction<any>\n }\n | { type: `delete`; transaction?: Transaction<any> },\n ) => {\n if (!capturedKeys.has(key)) return\n const layers = ownership.get(key) ?? []\n layers.push(layer)\n ownership.set(key, layers)\n }\n\n for (const key of capturedKeys) {\n const acceptedUpsert = this.pendingOptimisticUpserts.get(key)\n // A later accepted edit can depend on an active insert above an older\n // accepted delete. Capture both so the delete survives insert rollback.\n if (this.pendingOptimisticDeletes.has(key)) {\n addLayer(key, { type: `delete` })\n }\n if (acceptedUpsert) {\n addLayer(key, {\n type: `upsert`,\n value: this.resolveOptimisticUpsert(acceptedUpsert),\n transaction: acceptedUpsert.insertDependency?.transaction,\n })\n }\n }\n\n for (const transaction of this.transactions.values()) {\n if ([`completed`, `failed`].includes(transaction.state)) continue\n for (const mutation of transaction.mutations) {\n if (\n !mutation.optimistic ||\n !this.isThisCollection(mutation.collection) ||\n !capturedKeys.has(mutation.key as TKey)\n )\n continue\n if (mutation.type === `delete`) {\n addLayer(mutation.key as TKey, { type: `delete`, transaction })\n } else {\n addLayer(mutation.key as TKey, {\n type: `upsert`,\n value: this.resolveOptimisticUpsert(mutation),\n transaction,\n })\n }\n }\n }\n\n return { upserts, deletes, ownership }\n }\n\n /** Build once per output flush; queued membership excludes optimistic edits. */\n createSyncedKeyLookup(): (key: TKey) => boolean {\n if (this.pendingSyncedTransactions.length === 0)\n return (key) => this.syncedData.has(key)\n const queued = new Map<TKey, boolean>()\n let truncated = false\n for (const transaction of this.pendingSyncedTransactions) {\n if (!transaction.committed) continue\n if (transaction.truncate) {\n queued.clear()\n truncated = true\n }\n for (const operation of transaction.operations) {\n queued.set(operation.key as TKey, operation.type !== `delete`)\n }\n }\n return (key) => queued.get(key) ?? (!truncated && this.syncedData.has(key))\n }\n\n enableHydrationAuthorityTracking(): void {\n this.appliedAdapterDeletedKeys ??= new Set<TKey>()\n }\n\n /** A late hydration seed cannot supersede committed adapter work. */\n createAdapterAuthorityLookup(): (key: TKey) => boolean {\n const queuedKeys = new Set<TKey>()\n let queuedTruncate = false\n for (const transaction of this.pendingSyncedTransactions) {\n if (!transaction.committed || transaction.preserveHydrationSeedKeys)\n continue\n if (transaction.truncate) queuedTruncate = true\n for (const operation of transaction.operations) {\n queuedKeys.add(operation.key as TKey)\n }\n }\n return (key) =>\n this.hasAppliedAdapterTruncate ||\n queuedTruncate ||\n queuedKeys.has(key) ||\n this.appliedAdapterDeletedKeys?.has(key) === true ||\n (this.syncedData.has(key) && !this.hydrationSeedKeys.has(key))\n }\n\n private getProjectedSyncedKeyState(\n projection: PendingSyncedProjection<TOutput, TKey>,\n key: TKey,\n ): PendingSyncedKeyState<TOutput> {\n const state = projection.states.get(key)\n if (state !== undefined) return state\n if (projection.truncated) return { exists: false, value: undefined }\n return {\n exists: this.syncedData.has(key),\n value: this.syncedData.get(key),\n }\n }\n\n private classifyProjectedInsert(\n projection: PendingSyncedProjection<TOutput, TKey>,\n key: TKey,\n value: TOutput,\n ): PendingInsertDisposition {\n const current = this.getProjectedSyncedKeyState(projection, key)\n if (!current.exists) return `insert`\n if (\n (current.value !== undefined && deepEquals(current.value, value)) ||\n this.hydrationSeedKeys.has(key)\n ) {\n return `update`\n }\n return `duplicate`\n }\n\n /** Classify an adapter insert against retained and queued source state. */\n classifyPendingSyncedInsert(\n key: TKey,\n value: TOutput,\n ): PendingInsertDisposition {\n return this.classifyProjectedInsert(\n this.pendingSyncedProjection,\n key,\n value,\n )\n }\n\n private applyPendingSyncOperation(\n projection: PendingSyncedProjection<TOutput, TKey>,\n operation: PendingSyncOperation<TOutput, TKey>,\n ): void {\n const key = operation.key as TKey\n const rowUpdateMode = this.config.sync.rowUpdateMode || `partial`\n if (operation.type === `delete`) {\n projection.states.set(key, { exists: false, value: undefined })\n } else if (operation.type === `update` && rowUpdateMode === `partial`) {\n const current = this.getProjectedSyncedKeyState(projection, key)\n projection.states.set(key, {\n exists: true,\n value: Object.assign({}, current.value, operation.value),\n })\n } else {\n projection.states.set(key, { exists: true, value: operation.value })\n }\n }\n\n /** Extend the queued projection after admitting one sync operation. */\n stagePendingSyncOperation(\n operation: PendingSyncOperation<TOutput, TKey>,\n ): void {\n if (\n operation.type === `update` &&\n operation.originalSyncType !== `insert` &&\n this.config.sync.rowUpdateMode !== `full`\n ) {\n operation.admittedAgainstExistingRow = this.getProjectedSyncedKeyState(\n this.pendingSyncedProjection,\n operation.key as TKey,\n ).exists\n }\n this.applyPendingSyncOperation(this.pendingSyncedProjection, operation)\n }\n\n /**\n * Get the previous value for a key given previous optimistic state\n */\n private getPreviousValue(\n key: TKey,\n previousUpserts: Map<TKey, TOutput>,\n previousDeletes: Set<TKey>,\n ): TOutput | undefined {\n if (previousDeletes.has(key)) {\n return undefined\n }\n if (previousUpserts.has(key)) {\n return previousUpserts.get(key)\n }\n return this.syncedData.get(key)\n }\n\n private rebuildAutomaticRowMetadataWrites(\n transaction: PendingSyncedTransaction<TOutput, TKey>,\n ): void {\n const explicitKeys = transaction.explicitRowMetadataWriteKeys ?? new Set()\n const operationKeys = new Set(\n transaction.operations.map((operation) => operation.key as TKey),\n )\n for (const key of operationKeys) {\n if (!explicitKeys.has(key)) transaction.rowMetadataWrites.delete(key)\n }\n for (const operation of transaction.operations) {\n const key = operation.key as TKey\n if (explicitKeys.has(key)) continue\n if (operation.type === `delete`) {\n transaction.rowMetadataWrites.set(key, { type: `delete` })\n } else if (operation.metadata !== undefined) {\n transaction.rowMetadataWrites.set(key, {\n type: `set`,\n value: operation.metadata,\n })\n } else if (operation.type === `insert`) {\n transaction.rowMetadataWrites.set(key, { type: `delete` })\n }\n }\n }\n\n private rebuildPendingSyncedProjection(): Array<{\n transaction: PendingSyncedTransaction<TOutput, TKey>\n key: TKey\n error: Error\n }> {\n const projection: PendingSyncedProjection<TOutput, TKey> = {\n states: new Map(),\n truncated: false,\n }\n const invalidCommitted: Array<{\n transaction: PendingSyncedTransaction<TOutput, TKey>\n key: TKey\n error: Error\n }> = []\n\n for (const transaction of this.pendingSyncedTransactions) {\n // An open transaction invalidated by cancellation remains doomed until\n // its commit returns the rejected applied receipt. truncate() can reset\n // it explicitly after clearing its operations.\n if (transaction.invalidationError !== undefined) continue\n const wasTruncated = projection.truncated\n const statesBeforeTruncate = transaction.truncate\n ? projection.states\n : undefined\n const previousStates = new Map<\n TKey,\n PendingSyncedKeyState<TOutput> | undefined\n >()\n if (transaction.truncate) {\n projection.states = new Map()\n projection.truncated = true\n }\n\n let invalidKey: TKey | undefined\n let invalidReason: Error | undefined\n for (const operation of transaction.operations) {\n const key = operation.key as TKey\n if (!previousStates.has(key)) {\n previousStates.set(key, projection.states.get(key))\n }\n if (\n operation.originalSyncType === `insert` &&\n operation.type !== `delete`\n ) {\n const disposition = this.classifyProjectedInsert(\n projection,\n key,\n operation.value,\n )\n if (disposition === `duplicate`) {\n invalidKey = key\n break\n }\n operation.type = disposition\n }\n if (\n operation.admittedAgainstExistingRow === true &&\n !this.getProjectedSyncedKeyState(projection, key).exists\n ) {\n // Cancellation must not turn an admitted dependent update into an\n // independent missing-key upsert during queue replay.\n invalidKey = key\n invalidReason = new SyncTransactionAbortedError()\n break\n }\n this.applyPendingSyncOperation(projection, operation)\n }\n\n if (invalidKey !== undefined) {\n if (statesBeforeTruncate !== undefined) {\n projection.states = statesBeforeTruncate\n } else {\n for (const [key, previous] of previousStates) {\n if (previous === undefined) projection.states.delete(key)\n else projection.states.set(key, previous)\n }\n }\n projection.truncated = wasTruncated\n const error =\n invalidReason ??\n transaction.duplicateKeyError?.(invalidKey) ??\n new SyncTransactionAbortedError()\n if (transaction.committed) {\n invalidCommitted.push({ transaction, key: invalidKey, error })\n continue\n }\n transaction.invalidationError = error\n continue\n }\n this.rebuildAutomaticRowMetadataWrites(transaction)\n }\n\n this.pendingSyncedProjection = projection\n return invalidCommitted\n }\n\n private rejectInvalidCommittedTransactions(\n invalid: ReturnType<typeof this.rebuildPendingSyncedProjection>,\n ): Set<TKey> {\n const rejected = new Set(invalid.map(({ transaction }) => transaction))\n this.pendingSyncedTransactions = this.pendingSyncedTransactions.filter(\n (transaction) => !rejected.has(transaction),\n )\n const canceledKeys = new Set<TKey>()\n for (const { transaction, error } of invalid) {\n for (const operation of transaction.operations) {\n canceledKeys.add(operation.key as TKey)\n }\n transaction.applied.reject(error)\n }\n return canceledKeys\n }\n\n /** Rebuild after truncate or application changes queue history. */\n refreshPendingSyncedProjection(): void {\n const invalid = this.rebuildPendingSyncedProjection()\n if (invalid.length === 0) return\n this.rejectInvalidCommittedTransactions(invalid)\n throw invalid[0]!.error\n }\n\n /**\n * Attempts to commit pending synced transactions if there are no active transactions\n * This method processes operations from pending transactions and applies them to the synced data\n */\n commitPendingTransactions = () => {\n if (this.isDrainingSyncTransactions) return\n this.isDrainingSyncTransactions = true\n let failed = false\n let firstError: unknown\n try {\n let result: { processed: boolean; failure?: { error: unknown } }\n do {\n result = this.commitNextPendingTransactionBatch()\n if (result.failure && !failed) {\n failed = true\n firstError = result.failure.error\n }\n } while (result.processed)\n } finally {\n this.isDrainingSyncTransactions = false\n }\n if (failed) throw firstError\n }\n\n private commitNextPendingTransactionBatch(): {\n processed: boolean\n failure?: { error: unknown }\n } {\n const syncRunGeneration = this.syncRunGeneration\n // Check if there are any persisting transaction\n let hasPersistingTransaction = false\n for (const transaction of this.transactions.values()) {\n if (transaction.state === `persisting`) {\n hasPersistingTransaction = true\n break\n }\n }\n\n // pending synced transactions could be either `committed` or still open.\n // we only want to process `committed` transactions here\n const {\n committedSyncedTransactions,\n uncommittedSyncedTransactions,\n hasTruncateSync,\n hasImmediateSync,\n layoutChanged,\n } = this.pendingSyncedTransactions.reduce(\n (acc, t) => {\n if (t.committed) {\n acc.committedSyncedTransactions.push(t)\n acc.layoutChanged ||= t.layoutChanged\n if (t.truncate) {\n acc.hasTruncateSync = true\n }\n if (t.immediate) {\n acc.hasImmediateSync = true\n }\n } else {\n acc.uncommittedSyncedTransactions.push(t)\n }\n return acc\n },\n {\n committedSyncedTransactions: [] as Array<\n PendingSyncedTransaction<TOutput, TKey>\n >,\n uncommittedSyncedTransactions: [] as Array<\n PendingSyncedTransaction<TOutput, TKey>\n >,\n hasTruncateSync: false,\n hasImmediateSync: false,\n layoutChanged: false,\n },\n )\n\n if (committedSyncedTransactions.length === 0) {\n return { processed: false }\n }\n\n // Process committed transactions if:\n // 1. No persisting user transaction (normal sync flow), OR\n // 2. There's a truncate operation (must be processed immediately), OR\n // 3. There's an immediate transaction (manual writes must be processed synchronously)\n //\n // Note: When hasImmediateSync or hasTruncateSync is true, we process ALL committed\n // sync transactions (not just the immediate/truncate ones). This is intentional for\n // ordering correctness: if we only processed the immediate transaction, earlier\n // non-immediate transactions would be applied later and could overwrite newer state.\n // Processing all committed transactions together preserves causal ordering.\n if (!hasPersistingTransaction || hasTruncateSync || hasImmediateSync) {\n const previousLayout = layoutChanged ? [...this.keys()] : undefined\n this.pendingSyncedTransactions = uncommittedSyncedTransactions\n\n // Application is now the point of no return. Event listeners run before\n // the receipts resolve, so a signal aborted from one of those listeners\n // must not cancel writes that are already becoming visible.\n const deferOrder =\n committedSyncedTransactions.reduce(\n (count, transaction) => count + transaction.operations.length,\n 0,\n ) >= 512\n for (const transaction of committedSyncedTransactions) {\n transaction.applicationStarted = true\n }\n\n // Set flag to prevent redundant optimistic state recalculations\n this.isCommittingSyncTransactions = true\n\n // Get the optimistic snapshot from the truncate transaction (captured when truncate() was called)\n const truncateOptimisticSnapshot = hasTruncateSync\n ? committedSyncedTransactions.find((t) => t.truncate)\n ?.optimisticSnapshot\n : null\n // Snapshot capture and application can be separated by mutation\n // settlement. Freeze ownership at the application boundary: a rolled\n // back row is no longer owned, while an accepted non-direct mutation can\n // be cleared from the live pending maps by its source confirmation later\n // in this same atomic batch.\n const retainedTruncateLayer = (key: TKey) => {\n const layers = truncateOptimisticSnapshot?.ownership.get(key) ?? []\n for (let index = layers.length - 1; index >= 0; index--) {\n const layer = layers[index]!\n if (\n layer.transaction === undefined ||\n layer.transaction.state !== `failed`\n ) {\n return layer\n }\n }\n return undefined\n }\n let truncatePendingLocalChanges: Set<TKey> | undefined\n let truncatePendingLocalOrigins: Set<TKey> | undefined\n\n // First collect all keys that will be affected by sync operations\n const changedKeys = new Set<TKey>()\n const syncedInsertedOrUpdatedKeys = new Set<TKey>()\n const firstSyncOperations = new Map<\n TKey,\n OptimisticChangeMessage<TOutput>\n >()\n for (const transaction of committedSyncedTransactions) {\n for (const operation of transaction.operations) {\n const key = operation.key as TKey\n changedKeys.add(key)\n if (!firstSyncOperations.has(key))\n firstSyncOperations.set(key, operation)\n if (operation.type !== `delete`) syncedInsertedOrUpdatedKeys.add(key)\n }\n for (const [key] of transaction.rowMetadataWrites) {\n changedKeys.add(key)\n }\n }\n\n const virtualSnapshotKeys = new Set(changedKeys)\n for (const key of this.pendingOptimisticDirectUpserts) {\n virtualSnapshotKeys.add(key)\n }\n for (const key of this.pendingOptimisticDirectDeletes) {\n virtualSnapshotKeys.add(key)\n }\n const previousRowOrigins =\n this.snapshotRowOriginsForKeys(virtualSnapshotKeys)\n const previousOptimisticUpserts = new Map(this.optimisticUpserts)\n const previousOptimisticDeletes = new Set(this.optimisticDeletes)\n const completedDirectUpserts = new Set(\n this.pendingOptimisticDirectUpserts,\n )\n const completedDirectDeletes = new Set(\n this.pendingOptimisticDirectDeletes,\n )\n\n // Use pre-captured state if available (from optimistic scenarios),\n // otherwise capture current state (for pure sync scenarios)\n let currentVisibleState = this.preSyncVisibleState\n if (currentVisibleState.size === 0) {\n // No pre-captured state, capture it now for pure sync operations\n currentVisibleState = new Map<TKey, TOutput | undefined>()\n for (const key of changedKeys) {\n const currentValue = this.get(key)\n if (currentValue !== undefined) {\n currentVisibleState.set(key, currentValue)\n }\n }\n }\n\n const events: Array<ChangeMessage<TOutput, TKey>> = []\n if (hasTruncateSync) {\n // All queued transactions publish as one batch. Its clear prefix must\n // describe the prior visible rows, not intermediate queued writes.\n // Freeze metadata before replacement writes change row attribution.\n for (const [key, value] of this.entries()) {\n events.push({\n type: `delete`,\n key,\n value: this.enrichWithVirtualPropsSnapshot(\n value,\n this.getVirtualPropsSnapshotForState(key),\n ),\n })\n }\n }\n const rowUpdateMode = this.config.sync.rowUpdateMode || `partial`\n const completedOptimisticOps = new Map<\n TKey,\n { type: string; value: TOutput }\n >()\n\n for (const transaction of this.transactions.values()) {\n if (transaction.state === `completed`) {\n for (const mutation of transaction.mutations) {\n if (this.isThisCollection(mutation.collection)) {\n if (mutation.optimistic) {\n completedOptimisticOps.set(mutation.key, {\n type: mutation.type,\n value: mutation.modified as TOutput,\n })\n }\n }\n }\n }\n }\n\n for (const transaction of committedSyncedTransactions) {\n // Handle truncate operations first\n if (transaction.truncate) {\n // TRUNCATE PHASE\n // Clear the authoritative synced base. Subsequent server ops in this\n // same commit will rebuild the base atomically.\n // Preserve pending local tracking just long enough for operations in this\n // truncate batch to retain correct local origin semantics.\n truncatePendingLocalChanges = new Set(this.pendingLocalChanges)\n truncatePendingLocalOrigins = new Set(this.pendingLocalOrigins)\n this.syncedData.clear()\n this.syncedMetadata.clear()\n this.hydrationSeedKeys.clear()\n this.hydratedKeys.clear()\n if (\n !transaction.preserveHydrationSeedKeys &&\n this.appliedAdapterDeletedKeys\n ) {\n this.hasAppliedAdapterTruncate = true\n this.appliedAdapterDeletedKeys.clear()\n }\n this.clearOriginTrackingState()\n\n // Clear currentVisibleState for truncated keys to ensure subsequent operations\n // are compared against the post-truncate state (undefined) rather than pre-truncate state\n // This ensures that re-inserted keys are emitted as INSERT events, not UPDATE events\n for (const key of changedKeys) {\n currentVisibleState.delete(key)\n }\n\n // Emit truncate event so subscriptions can reset their cursor tracking state\n this._events.emit(`truncate`, {\n type: `truncate`,\n collection: this.collection,\n })\n }\n\n // Attribution belongs to the whole atomic batch. A repeated write must\n // not forget the local acknowledgement consumed by its first operation.\n const localKeys = new Set<TKey>()\n for (const operation of transaction.operations) {\n const key = operation.key as TKey\n\n // Determine origin: 'local' for local-only collections or pending local changes\n const retainedLocalOrigin =\n truncatePendingLocalChanges?.has(key) === true ||\n (truncatePendingLocalOrigins?.has(key) === true &&\n !completedDirectUpserts.has(key) &&\n !completedDirectDeletes.has(key))\n const origin: VirtualOrigin =\n this.isLocalOnly ||\n this.pendingLocalChanges.has(key) ||\n this.pendingLocalOrigins.has(key) ||\n localKeys.has(key) ||\n retainedLocalOrigin\n ? 'local'\n : 'remote'\n if (origin === `local`) localKeys.add(key)\n\n // A sync source may reuse a live-reading row object, making an\n // enriched snapshot cached for an earlier publication stale.\n if (operation.type !== `delete`)\n this.virtualPropsCache.delete(operation.value)\n\n // Update synced data\n switch (operation.type) {\n case `insert`:\n this.syncedData.set(key, operation.value, deferOrder)\n this.rowOrigins.set(key, origin)\n // Clear pending local changes now that sync has confirmed\n this.pendingLocalChanges.delete(key)\n this.pendingLocalOrigins.delete(key)\n this.pendingOptimisticUpserts.delete(key)\n this.pendingOptimisticDeletes.delete(key)\n this.pendingOptimisticDirectUpserts.delete(key)\n this.pendingOptimisticDirectDeletes.delete(key)\n break\n case `update`: {\n if (rowUpdateMode === `partial`) {\n const updatedValue = Object.assign(\n {},\n this.syncedData.get(key),\n operation.value,\n )\n this.syncedData.set(key, updatedValue, deferOrder)\n } else {\n this.syncedData.set(key, operation.value, deferOrder)\n }\n this.rowOrigins.set(key, origin)\n // Clear pending local changes now that sync has confirmed\n this.pendingLocalChanges.delete(key)\n this.pendingLocalOrigins.delete(key)\n this.pendingOptimisticUpserts.delete(key)\n this.pendingOptimisticDeletes.delete(key)\n this.pendingOptimisticDirectUpserts.delete(key)\n this.pendingOptimisticDirectDeletes.delete(key)\n break\n }\n case `delete`:\n this.syncedData.delete(key, deferOrder)\n this.syncedMetadata.delete(key)\n // Clean up origin and pending tracking for deleted rows\n this.rowOrigins.delete(key)\n this.pendingLocalChanges.delete(key)\n this.pendingLocalOrigins.delete(key)\n this.pendingOptimisticUpserts.delete(key)\n this.pendingOptimisticDeletes.delete(key)\n this.pendingOptimisticDirectUpserts.delete(key)\n this.pendingOptimisticDirectDeletes.delete(key)\n break\n }\n if (!transaction.preserveHydrationSeedKeys) {\n this.hydrationSeedKeys.delete(key)\n this.hydratedKeys.delete(key)\n if (operation.type === `delete`)\n this.appliedAdapterDeletedKeys?.add(key)\n else this.appliedAdapterDeletedKeys?.delete(key)\n }\n }\n\n for (const [key, metadataWrite] of transaction.rowMetadataWrites) {\n if (metadataWrite.type === `delete`) {\n this.syncedMetadata.delete(key)\n continue\n }\n this.syncedMetadata.set(key, metadataWrite.value)\n }\n\n for (const [\n key,\n metadataWrite,\n ] of transaction.collectionMetadataWrites) {\n if (metadataWrite.type === `delete`) {\n this.syncedCollectionMetadata.delete(key)\n continue\n }\n this.syncedCollectionMetadata.set(key, metadataWrite.value)\n }\n }\n this.syncedData.restoreOrder()\n\n // The retained base now includes every removed committed transaction.\n // Rebuild only the projection for still-open transactions.\n this.refreshPendingSyncedProjection()\n\n // A completed optimistic insert may have used a temporary client key while\n // the sync confirmation used a different server-generated key. Once a\n // sync commit has been applied, stop retaining completed optimistic keys\n // that were not confirmed by this commit so the temporary row is removed.\n for (const key of this.pendingOptimisticDirectUpserts) {\n // An active delete can hide an accepted snapshot. Retain it through\n // truncate so rollback can restore it. A direct insert completed after\n // snapshot capture has no support in the replacement and must retire.\n if (\n hasTruncateSync &&\n this.pendingOptimisticUpserts.has(key) &&\n (truncateOptimisticSnapshot?.upserts.has(key) === true ||\n truncateOptimisticSnapshot?.deletes.has(key) === true) &&\n !changedKeys.has(key)\n )\n continue\n if (!changedKeys.has(key)) {\n changedKeys.add(key)\n // Truncate already emitted the prior visible rows as its clear\n // prefix. Reconstructing one here would publish a duplicate delete.\n if (!hasTruncateSync && !currentVisibleState.has(key)) {\n const previousValue = previousOptimisticUpserts.get(key)\n if (previousValue !== undefined) {\n currentVisibleState.set(key, previousValue)\n }\n }\n this.pendingOptimisticUpserts.delete(key)\n this.pendingLocalOrigins.delete(key)\n }\n this.pendingOptimisticDirectUpserts.delete(key)\n }\n for (const key of this.pendingOptimisticDirectDeletes) {\n if (\n hasTruncateSync &&\n (truncateOptimisticSnapshot?.deletes.has(key) ||\n truncateOptimisticSnapshot?.ownership\n .get(key)\n ?.some(\n (layer) => layer.type === `delete` && !layer.transaction,\n )) &&\n !changedKeys.has(key)\n )\n continue\n if (!changedKeys.has(key)) {\n changedKeys.add(key)\n }\n this.pendingOptimisticDeletes.delete(key)\n this.pendingLocalOrigins.delete(key)\n this.pendingOptimisticDirectDeletes.delete(key)\n }\n\n // Maintain optimistic state appropriately\n // Clear optimistic state since sync operations will now provide the authoritative data.\n // Any still-active user transactions will be re-applied below in recompute.\n this.optimisticUpserts.clear()\n this.optimisticDeletes.clear()\n\n // Reset flag and recompute optimistic state for any remaining active transactions\n this.isCommittingSyncTransactions = false\n\n // If we had a truncate, restore the preserved optimistic state from the snapshot\n // This includes items from transactions that may have completed during processing\n if (hasTruncateSync && truncateOptimisticSnapshot) {\n for (const key of truncateOptimisticSnapshot.ownership.keys()) {\n const layer = retainedTruncateLayer(key)\n if (!layer) continue\n if (layer.type === `upsert`) {\n if (completedDirectUpserts.has(key) && changedKeys.has(key))\n continue\n this.optimisticUpserts.set(key, layer.value)\n } else {\n if (completedDirectDeletes.has(key) && changedKeys.has(key))\n continue\n this.optimisticDeletes.add(key)\n }\n }\n }\n\n // Always overlay any still-active optimistic transactions so mutations that started\n // after the truncate snapshot are preserved.\n for (const transaction of this.transactions.values()) {\n if (![`completed`, `failed`].includes(transaction.state)) {\n for (const mutation of transaction.mutations) {\n // Truncate clears attribution with the old base, not the still-live\n // local requests. Preserve them for later source acknowledgements.\n if (this.isThisCollection(mutation.collection))\n this.pendingLocalChanges.add(mutation.key)\n if (\n this.isThisCollection(mutation.collection) &&\n mutation.type === `insert` &&\n syncedInsertedOrUpdatedKeys.has(mutation.key)\n ) {\n this.acknowledgedInserts.add(mutation)\n }\n if (\n this.isThisCollection(mutation.collection) &&\n mutation.optimistic\n ) {\n switch (mutation.type) {\n case `insert`:\n case `update`:\n this.optimisticUpserts.set(\n mutation.key,\n this.resolveOptimisticUpsert(mutation),\n )\n this.optimisticDeletes.delete(mutation.key)\n break\n case `delete`:\n this.optimisticUpserts.delete(mutation.key)\n this.optimisticDeletes.add(mutation.key)\n break\n }\n }\n }\n }\n }\n\n // After applying synced operations, if this commit included a truncate,\n // re-apply optimistic mutations on top of the fresh synced base. This ensures\n // the UI preserves local intent while respecting server rebuild semantics.\n // Ordering: deletes (above) -> server ops (just applied) -> optimistic upserts.\n if (hasTruncateSync) {\n // Events use the same rebuilt overlay as synchronous reads.\n const reapplyUpserts = this.optimisticUpserts\n const reapplyDeletes = this.optimisticDeletes\n\n // Emit inserts for re-applied upserts, skipping any keys that have an optimistic delete.\n // If the server also inserted/updated the same key in this batch, override that value\n // with the optimistic value to preserve local intent.\n for (const [key, value] of reapplyUpserts) {\n if (reapplyDeletes.has(key)) continue\n if (syncedInsertedOrUpdatedKeys.has(key)) {\n let foundInsert = false\n for (let i = events.length - 1; i >= 0; i--) {\n const evt = events[i]!\n if (evt.key === key && evt.type === `insert`) {\n evt.value = value\n foundInsert = true\n break\n }\n }\n if (!foundInsert) {\n events.push({ type: `insert`, key, value })\n }\n } else {\n events.push({ type: `insert`, key, value })\n }\n }\n\n // Finally, ensure we do NOT insert keys that have an outstanding optimistic delete.\n if (events.length > 0 && reapplyDeletes.size > 0) {\n const filtered: Array<ChangeMessage<TOutput, TKey>> = []\n for (const evt of events) {\n if (evt.type === `insert` && reapplyDeletes.has(evt.key)) {\n continue\n }\n filtered.push(evt)\n }\n events.length = 0\n events.push(...filtered)\n }\n\n // Ensure listeners are active before emitting this critical batch\n if (this.lifecycle.status !== `ready`) {\n this.lifecycle.markReady()\n }\n }\n\n // Now check what actually changed in the final visible state\n for (const key of changedKeys) {\n const firstSyncOperation = firstSyncOperations.get(key)\n // A live-reading source can change a reused row before this commit\n // captures it. Later writes must not substitute an intermediate value.\n const syncPreviousValue =\n firstSyncOperation?.type === `update` &&\n currentVisibleState.get(key) === firstSyncOperation.value\n ? firstSyncOperation.previousValue\n : undefined\n const previousVisibleValue =\n !hasTruncateSync &&\n !previousOptimisticUpserts.has(key) &&\n !previousOptimisticDeletes.has(key) &&\n syncPreviousValue !== undefined\n ? syncPreviousValue\n : currentVisibleState.get(key)\n const newVisibleValue = this.get(key) // This returns the new derived state\n const previousVirtualProps =\n this.preSyncVirtualState.get(key) ??\n this.getVirtualPropsSnapshotForState(key, {\n rowOrigins: previousRowOrigins,\n optimisticUpserts: previousOptimisticUpserts,\n optimisticDeletes: previousOptimisticDeletes,\n completedOptimisticKeys: completedOptimisticOps,\n })\n const nextVirtualProps = this.getVirtualPropsSnapshotForState(key)\n const virtualChanged =\n previousVirtualProps.$synced !== nextVirtualProps.$synced ||\n previousVirtualProps.$origin !== nextVirtualProps.$origin\n const previousValueWithVirtual =\n previousVisibleValue !== undefined\n ? enrichRowWithVirtualProps(\n previousVisibleValue,\n key,\n this.collection.id,\n () => previousVirtualProps.$synced,\n () => previousVirtualProps.$origin,\n )\n : undefined\n\n const shouldEmitVirtualUpdate =\n virtualChanged &&\n previousVisibleValue !== undefined &&\n newVisibleValue !== undefined &&\n deepEquals(previousVisibleValue, newVisibleValue)\n\n if (\n previousVisibleValue === undefined &&\n newVisibleValue !== undefined\n ) {\n const completedOptimisticOp = completedOptimisticOps.get(key)\n if (completedOptimisticOp) {\n const previousValueFromCompleted = completedOptimisticOp.value\n const previousValueWithVirtualFromCompleted =\n enrichRowWithVirtualProps(\n previousValueFromCompleted,\n key,\n this.collection.id,\n () => previousVirtualProps.$synced,\n () => previousVirtualProps.$origin,\n )\n events.push({\n type: `update`,\n key,\n value: newVisibleValue,\n previousValue: previousValueWithVirtualFromCompleted,\n })\n } else {\n events.push({\n type: `insert`,\n key,\n value: newVisibleValue,\n })\n }\n } else if (\n previousVisibleValue !== undefined &&\n newVisibleValue === undefined\n ) {\n events.push({\n type: `delete`,\n key,\n value: previousValueWithVirtual ?? previousVisibleValue,\n })\n } else if (\n previousVisibleValue !== undefined &&\n newVisibleValue !== undefined &&\n (!deepEquals(previousVisibleValue, newVisibleValue) ||\n shouldEmitVirtualUpdate)\n ) {\n events.push({\n type: `update`,\n key,\n value: newVisibleValue,\n previousValue: previousValueWithVirtual ?? previousVisibleValue,\n })\n }\n }\n\n // Update cached size after synced data changes\n this.size = this.calculateSize()\n\n // Update indexes for all events before emitting\n if (events.length > 0) {\n this.indexes.updateIndexes(events)\n }\n\n // End batching and emit all events (combines any batched events with sync events)\n let failure: { error: unknown } | undefined\n try {\n const visibleLayoutChanged =\n previousLayout !== undefined &&\n (previousLayout.length !== this.size ||\n [...this.keys()].some(\n (key, index) => key !== previousLayout[index],\n ))\n this.changes.emitEvents(events, true, visibleLayoutChanged)\n } catch (error) {\n failure = { error }\n }\n\n if (this.syncRunGeneration === syncRunGeneration) {\n this.preSyncVisibleState.clear()\n this.preSyncVirtualState.clear()\n Promise.resolve().then(() => {\n if (this.syncRunGeneration === syncRunGeneration) {\n this.recentlySyncedKeys.clear()\n }\n })\n if (!this.hasReceivedFirstCommit) this.hasReceivedFirstCommit = true\n }\n\n for (const transaction of committedSyncedTransactions) {\n transaction.applied.resolve()\n }\n\n return { processed: true, failure }\n }\n\n return { processed: false }\n }\n\n /** Abandons a queued transaction and invalidated dependents before visibility. */\n public cancelPendingSyncedTransaction(\n transaction: PendingSyncedTransaction<TOutput, TKey>,\n reason: Error = new SyncTransactionAbortedError(),\n ): void {\n if (transaction.applicationStarted) return\n\n const index = this.pendingSyncedTransactions.indexOf(transaction)\n if (index === -1) return\n\n const canceledKeys = new Set<TKey>()\n const cancel = (\n pending: PendingSyncedTransaction<TOutput, TKey>,\n error: Error,\n ) => {\n const pendingIndex = this.pendingSyncedTransactions.indexOf(pending)\n if (pendingIndex === -1 || pending.applicationStarted) return\n this.pendingSyncedTransactions.splice(pendingIndex, 1)\n for (const operation of pending.operations) {\n canceledKeys.add(operation.key as TKey)\n }\n pending.applied.reject(error)\n }\n\n cancel(transaction, reason)\n\n // Admission can depend on earlier queued writes. After cancellation,\n // replay the queue with the same classifier used by normal admission.\n // Committed invalid dependents are rejected now. An active invalidated\n // transaction stays addressable until its caller invokes commit().\n const invalid = this.rebuildPendingSyncedProjection()\n for (const key of this.rejectInvalidCommittedTransactions(invalid)) {\n canceledKeys.add(key)\n }\n\n const remainingPendingKeys = new Set<TKey>()\n for (const pending of this.pendingSyncedTransactions) {\n if (pending.invalidationError !== undefined) continue\n for (const operation of pending.operations) {\n remainingPendingKeys.add(operation.key as TKey)\n }\n }\n for (const key of canceledKeys) {\n if (!remainingPendingKeys.has(key)) {\n this.recentlySyncedKeys.delete(key)\n this.preSyncVisibleState.delete(key)\n this.preSyncVirtualState.delete(key)\n }\n }\n\n if (this.pendingSyncedTransactions.length === 0) {\n this.preSyncVisibleState.clear()\n this.preSyncVirtualState.clear()\n this.recentlySyncedKeys.clear()\n this.changes.emitEvents([], true)\n } else {\n // Recompute after removing the canceled keys so optimistic cleanup is\n // no longer suppressed by a sync transaction that will never publish.\n this.recomputeOptimisticState(false)\n }\n }\n\n /**\n * Schedule cleanup of a transaction when it completes\n */\n public scheduleTransactionCleanup(transaction: Transaction<any>): void {\n // Only schedule cleanup for transactions that aren't already completed\n if (transaction.state === `completed`) {\n this.transactions.delete(transaction.id)\n return\n }\n\n // Schedule cleanup when the transaction completes\n transaction.isPersisted.promise\n .then(() => {\n // Transaction completed successfully, remove it immediately\n this.transactions.delete(transaction.id)\n })\n .catch(() => {\n // Transaction failed, but we want to keep failed transactions for reference\n // so don't remove it.\n // Rollback already triggers state recomputation via touchCollection().\n })\n }\n\n /**\n * Capture visible state for keys that will be affected by pending sync operations\n * This must be called BEFORE onTransactionStateChange clears optimistic state\n */\n public capturePreSyncVisibleState(): void {\n if (this.pendingSyncedTransactions.length === 0) return\n\n // Get all keys that will be affected by sync operations\n const syncedKeys = new Set<TKey>()\n for (const transaction of this.pendingSyncedTransactions) {\n for (const operation of transaction.operations) {\n syncedKeys.add(operation.key as TKey)\n }\n }\n\n // Mark keys as about to be synced to suppress intermediate events from recomputeOptimisticState\n for (const key of syncedKeys) {\n this.recentlySyncedKeys.add(key)\n }\n\n // Only capture current visible state for keys that will be affected by sync operations\n // This is much more efficient than capturing the entire collection state\n // Only capture keys that haven't been captured yet to preserve earlier captures\n for (const key of syncedKeys) {\n if (!this.preSyncVisibleState.has(key)) {\n const currentValue = this.get(key)\n this.preSyncVisibleState.set(key, currentValue)\n if (currentValue !== undefined) {\n this.preSyncVirtualState.set(\n key,\n this.getVirtualPropsSnapshotForState(key),\n )\n }\n }\n }\n }\n\n /**\n * Trigger a recomputation when transactions change\n * This method should be called by the Transaction class when state changes\n */\n public onTransactionStateChange(): void {\n // Batch only when the next sync drain can actually publish. A persisting\n // sibling can keep normal sync queued; it must not hide this rollback.\n const hasPersistingTransaction = [...this.transactions.values()].some(\n (transaction) => transaction.state === `persisting`,\n )\n this.changes.shouldBatchEvents = this.pendingSyncedTransactions.some(\n (transaction) =>\n transaction.committed &&\n (!hasPersistingTransaction ||\n transaction.immediate ||\n transaction.truncate),\n )\n\n // CRITICAL: Capture visible state BEFORE clearing optimistic state\n if (this.changes.shouldBatchEvents) this.capturePreSyncVisibleState()\n\n this.recomputeOptimisticState(false)\n }\n\n /**\n * Clean up the collection by stopping sync and clearing data\n * This can be called manually or automatically by garbage collection\n */\n public cleanup(): void {\n this.syncRunGeneration++\n for (const transaction of this.pendingSyncedTransactions) {\n transaction.applied.reject(new SyncTransactionAbortedError())\n }\n this.syncedData.clear()\n this.syncedMetadata.clear()\n this.syncedCollectionMetadata.clear()\n this.optimisticUpserts.clear()\n this.optimisticDeletes.clear()\n this.pendingOptimisticUpserts.clear()\n this.pendingOptimisticDeletes.clear()\n this.pendingOptimisticDirectUpserts.clear()\n this.pendingOptimisticDirectDeletes.clear()\n this.hydrationSeedKeys.clear()\n this.hydratedKeys.clear()\n this.appliedAdapterDeletedKeys?.clear()\n this.hasAppliedAdapterTruncate = false\n this.clearOriginTrackingState()\n this.isLocalOnly = false\n this.size = 0\n this.pendingSyncedTransactions = []\n this.pendingSyncedProjection = { states: new Map(), truncated: false }\n this.preSyncVisibleState.clear()\n this.preSyncVirtualState.clear()\n this.recentlySyncedKeys.clear()\n this.hasReceivedFirstCommit = false\n 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