{"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 {\n  SyncQueueInvariantError,\n  SyncTransactionAbortedError,\n} from '../errors.js'\nimport type { DuplicateKeySyncError } from '../errors.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  OperationType,\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'\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}\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  preserveHydrationSeedKeys?: boolean\n  /** Builds the error for an open transaction whose insert a replay invalidates. */\n  duplicateKeyError?: (key: TKey) => DuplicateKeySyncError\n  /**\n   * Set when a replay invalidates an open transaction, which happens when a\n   * later transaction begun inside it commits first. Its commit rejects.\n   */\n  invalidationError?: Error\n}\n\ntype PendingMetadataWrite = { type: `set`; value: unknown } | { type: `delete` }\n\n/** The row metadata a sync operation writes unless the adapter set it explicitly. */\nexport function automaticRowMetadataWrite(\n  operation: Pick<OptimisticChangeMessage<object>, `type` | `metadata`>,\n): PendingMetadataWrite | undefined {\n  if (operation.metadata !== undefined && operation.type !== `delete`) {\n    return { type: `set`, value: operation.metadata }\n  }\n  return operation.type === `update` ? undefined : { type: `delete` }\n}\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  // A completed transaction's optimistic row is held only while a queued sync\n  // transaction touches its key, so the drop and that sync transaction\n  // publish together.\n  // The newest completed transaction owns a held key; no row means a delete.\n  public heldOptimisticRows = new Map<\n    TKey,\n    { owner: Transaction<any>; row?: TOutput }\n  >()\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  // A completed mutation attributes only the sync writes committed before its\n  // optimistic state dropped: those held at its completion boundary. 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  // Keyed by row key, not row object: adding a WeakMap entry for each\n  // published row cost more than the copy it saves. Sync writes, deletes,\n  // and cleanup drop a key's entry.\n  private virtualPropsCache = new Map<\n    TKey,\n    {\n      row: TOutput\n      synced: boolean\n      origin: VirtualOrigin\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   * Set by a local-only Collection for operation types without a user handler.\n   * Their direct mutations can be written as synced rows at once.\n   */\n  public localOnlyDirectWrite:\n    | {\n        types: ReadonlySet<OperationType>\n        write: (mutations: Array<PendingMutation<TOutput>>) => void\n      }\n    | undefined\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 $origin virtual property.\n   */\n  public getRowOrigin(key: TKey): VirtualOrigin {\n    if (this.isLocalOnly) {\n      return 'local'\n    }\n    // If there are optimistic changes, they're local\n    if (this.optimisticUpserts.has(key) || this.optimisticDeletes.has(key)) {\n      return 'local'\n    }\n    // Otherwise, return the confirmed origin (defaults to 'remote' for synced data)\n    return this.rowOrigins.get(key) ?? 'remote'\n  }\n\n  private createVirtualPropsSnapshot(\n    key: TKey,\n    overrides?: Partial<VirtualRowProps<TKey>>,\n  ): VirtualRowProps<TKey> {\n    const synced = overrides?.$synced ?? this.isRowSynced(key)\n    return {\n      $hasPendingWrites: !synced,\n      $synced: synced,\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    },\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) || optimisticDeletes.has(key)\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(resolvedKey)\n    if (\n      cached &&\n      cached.row === row &&\n      cached.synced === synced &&\n      cached.origin === origin &&\n      cached.collectionId === collectionId\n    ) {\n      return cached.enriched\n    }\n\n    const enriched = {\n      ...row,\n      $hasPendingWrites: !synced,\n      $synced: synced,\n      $origin: origin,\n      $key: resolvedKey,\n      $collectionId: collectionId,\n    } as WithVirtualProps<TOutput, TKey>\n\n    this.virtualPropsCache.set(resolvedKey, {\n      row,\n      synced,\n      origin,\n      collectionId,\n      enriched,\n    })\n\n    return enriched\n  }\n\n  private clearOriginTrackingState(): void {\n    this.virtualPropsCache.clear()\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   * Visible entries whose stored row passes `prefilter`, enriched with virtual\n   * properties. Rows that fail are never enriched.\n   */\n  public *entriesPassing(\n    prefilter: (row: object) => boolean,\n  ): IterableIterator<[TKey, WithVirtualProps<TOutput, TKey>]> {\n    // Without optimistic state, the visible rows are the synced rows in order.\n    const rows =\n      this.optimisticUpserts.size === 0 && this.optimisticDeletes.size === 0\n        ? this.syncedData\n        : this.entries()\n    for (const [key, row] of rows) {\n      if (prefilter(row)) yield [key, this.enrichWithVirtualProps(row, 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    // The cache holds one row per key, so the previous row goes first and\n    // the published value stays the row that later reads return.\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    const enrichedValue = __virtualProps?.value\n      ? this.enrichWithVirtualPropsSnapshot(change.value, __virtualProps.value)\n      : this.enrichWithVirtualProps(change.value, change.key)\n    // A deleted key, such as a rolled-back insert, has no row to read again.\n    if (change.type === `delete`) this.virtualPropsCache.delete(change.key)\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    // Hold completed optimistic rows, and their local attribution, only while\n    // an accepted, queued sync transaction touches them; an open one is not\n    // accepted yet. That sync was committed before\n    // the optimistic state dropped; a later one is remote.\n    const pendingSyncKeys = new Set<TKey>()\n    for (const transaction of this.pendingSyncedTransactions) {\n      if (!transaction.committed) continue\n      for (const operation of transaction.operations) {\n        pendingSyncKeys.add(operation.key as TKey)\n      }\n    }\n    for (const transaction of this.transactions.values()) {\n      if (transaction.state !== `completed`) continue\n      for (const mutation of transaction.mutations) {\n        if (\n          !this.isThisCollection(mutation.collection) ||\n          !pendingSyncKeys.has(mutation.key)\n        )\n          continue\n        this.pendingLocalOrigins.add(mutation.key)\n        if (!mutation.optimistic) continue\n        // A completed transaction leaves `transactions` before a newer one\n        // settles, so keep the newest owner's row.\n        const held = this.heldOptimisticRows.get(mutation.key)\n        if (held && held.owner.compareCreatedAt(transaction) > 0) continue\n        this.heldOptimisticRows.set(mutation.key, {\n          owner: transaction,\n          row: mutation.type === `delete` ? undefined : mutation.modified,\n        })\n      }\n    }\n\n    // Clear current optimistic state\n    this.optimisticUpserts.clear()\n    this.optimisticDeletes.clear()\n    this.pendingLocalChanges.clear()\n\n    for (const [key, { row }] of this.heldOptimisticRows) {\n      if (!pendingSyncKeys.has(key)) {\n        this.heldOptimisticRows.delete(key)\n        this.pendingLocalOrigins.delete(key)\n      } else if (row === undefined) this.optimisticDeletes.add(key)\n      else this.optimisticUpserts.set(key, row)\n    }\n\n    this.overlayActiveTransactions()\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    // A user action publishes all its events. Otherwise the sync drain\n    // already published the recently synced keys.\n    const filteredEvents = triggeredByUserAction\n      ? events\n      : events.filter((event) => !this.recentlySyncedKeys.has(event.key))\n    if (filteredEvents.length > 0) this.indexes.updateIndexes(filteredEvents)\n    this.changes.emitEvents(filteredEvents, triggeredByUserAction)\n  }\n\n  /**\n   * Overlay still-active optimistic mutations on the current layers and\n   * record their keys as pending local changes for $origin tracking.\n   */\n  private overlayActiveTransactions(): void {\n    for (const transaction of this.transactions.values()) {\n      if (transaction.state === `completed` || transaction.state === `failed`)\n        continue\n      for (const mutation of transaction.mutations) {\n        if (!this.isThisCollection(mutation.collection)) continue\n        this.pendingLocalChanges.add(mutation.key)\n        if (!mutation.optimistic) continue\n        if (mutation.type === `delete`) {\n          this.optimisticUpserts.delete(mutation.key)\n          this.optimisticDeletes.add(mutation.key)\n        } else {\n          this.optimisticUpserts.set(mutation.key, mutation.modified)\n          this.optimisticDeletes.delete(mutation.key)\n        }\n      }\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  /** 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  /**\n   * The synced row once every accepted sync transaction applies. A queued\n   * transaction is accepted before it is visible, so a direct write must\n   * read this rather than `syncedData`.\n   */\n  getAcceptedSyncedRow(key: TKey): TOutput | undefined {\n    return this.getProjectedSyncedKeyState(this.pendingSyncedProjection, key)\n      .value\n  }\n\n  /**\n   * Accept a committed seed transaction, such as a DbClient hydration chunk,\n   * ahead of any still-open source transaction, so that source's `commit()`\n   * still targets its own writes.\n   */\n  acceptSeedTransaction(\n    transaction: PendingSyncedTransaction<TOutput, TKey>,\n  ): void {\n    const open = this.pendingSyncedTransactions.findIndex(\n      (pending) => !pending.committed,\n    )\n    if (open === -1) this.pendingSyncedTransactions.push(transaction)\n    else this.pendingSyncedTransactions.splice(open, 0, transaction)\n    this.refreshPendingSyncedProjection()\n    this.commitPendingTransactions()\n  }\n\n  /** Every synced row once every accepted sync transaction applies. */\n  *acceptedSyncedEntries(): IterableIterator<[TKey, TOutput]> {\n    const { states, truncated } = this.pendingSyncedProjection\n    if (!truncated) {\n      for (const entry of this.syncedData.entries()) {\n        if (!states.has(entry[0])) yield entry\n      }\n    }\n    for (const [key, state] of states) {\n      if (state.exists) yield [key, state.value!]\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        // Spread defines own fields; assignment would run a `__proto__` setter.\n        value: { ...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    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      const metadataWrite = automaticRowMetadataWrite(operation)\n      if (metadataWrite) transaction.rowMetadataWrites.set(key, metadataWrite)\n    }\n  }\n\n  /**\n   * Rebuild the queued projection after truncate, application, or an\n   * accepted seed changes queue history. An open transaction can become\n   * invalid when a later transaction begun inside it commits first; it then\n   * holds an invalidation error that its commit returns. Only the open last\n   * transaction can be canceled, so a replay that invalidates a committed\n   * transaction is an invariant failure.\n   */\n  private rebuildPendingSyncedProjection(): void {\n    const projection: PendingSyncedProjection<TOutput, TKey> = {\n      states: new Map(),\n      truncated: false,\n    }\n\n    for (const transaction of this.pendingSyncedTransactions) {\n      if (transaction.invalidationError !== undefined) continue\n      const statesBeforeTransaction = new Map(projection.states)\n      const truncatedBeforeTransaction = projection.truncated\n      if (transaction.truncate) {\n        projection.states = new Map()\n        projection.truncated = true\n      }\n\n      let invalidKey: TKey | undefined\n      for (const operation of transaction.operations) {\n        const key = operation.key as TKey\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        this.applyPendingSyncOperation(projection, operation)\n      }\n      if (invalidKey !== undefined) {\n        if (transaction.committed)\n          throw new SyncQueueInvariantError(\n            `replay made an accepted insert a duplicate`,\n          )\n        projection.states = statesBeforeTransaction\n        projection.truncated = truncatedBeforeTransaction\n        transaction.invalidationError =\n          transaction.duplicateKeyError?.(invalidKey) ??\n          new SyncTransactionAbortedError()\n        continue\n      }\n      this.rebuildAutomaticRowMetadataWrites(transaction)\n    }\n\n    this.pendingSyncedProjection = projection\n  }\n\n  /** Rebuild after truncate, application, or an accepted seed. */\n  refreshPendingSyncedProjection(): void {\n    this.rebuildPendingSyncedProjection()\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  hasPersistingTransaction(): boolean {\n    for (const transaction of this.transactions.values()) {\n      if (transaction.state === `persisting`) return true\n    }\n    return false\n  }\n\n  private commitNextPendingTransactionBatch(): {\n    processed: boolean\n    failure?: { error: unknown }\n  } {\n    const syncRunGeneration = this.syncRunGeneration\n    const hasPersistingTransaction = this.hasPersistingTransaction()\n\n    // pending synced transactions could be either `committed` or still open.\n    // we only want to process `committed` transactions here\n    const committedSyncedTransactions: Array<\n      PendingSyncedTransaction<TOutput, TKey>\n    > = []\n    const uncommittedSyncedTransactions: Array<\n      PendingSyncedTransaction<TOutput, TKey>\n    > = []\n    let hasTruncateSync = false\n    let layoutChanged = false\n    for (const t of this.pendingSyncedTransactions) {\n      if (t.committed) {\n        committedSyncedTransactions.push(t)\n        layoutChanged ||= t.layoutChanged\n        hasTruncateSync ||= t.truncate === true\n      } else {\n        uncommittedSyncedTransactions.push(t)\n      }\n    }\n\n    if (committedSyncedTransactions.length === 0) {\n      return { processed: false }\n    }\n\n    // A persisting transaction holds sync transactions until it settles. A\n    // truncate applies at once, with every committed transaction before it,\n    // so later application cannot overwrite newer state.\n    if (!hasPersistingTransaction || hasTruncateSync) {\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      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 previousRowOrigins = this.snapshotRowOriginsForKeys(changedKeys)\n      const previousOptimisticUpserts = new Map(this.optimisticUpserts)\n      const previousOptimisticDeletes = new Set(this.optimisticDeletes)\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      let reappliedKeys: ReadonlySet<TKey> | undefined\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      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          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          this.virtualPropsCache.delete(key)\n\n          if (operation.type === `delete`) {\n            this.syncedData.delete(key, deferOrder)\n            this.syncedMetadata.delete(key)\n            this.rowOrigins.delete(key)\n          } else {\n            this.syncedData.set(\n              key,\n              operation.type === `update` && rowUpdateMode === `partial`\n                ? { ...this.syncedData.get(key), ...operation.value }\n                : operation.value,\n              deferOrder,\n            )\n            this.rowOrigins.set(key, origin)\n          }\n          // Sync has confirmed the key, so local tracking for it ends.\n          this.pendingLocalChanges.delete(key)\n          this.pendingLocalOrigins.delete(key)\n          this.heldOptimisticRows.delete(key)\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      // 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      // Always overlay any still-active optimistic transactions so mutations that started\n      // after the truncate snapshot are preserved. Truncate clears attribution\n      // with the old base, not the still-live local requests.\n      this.overlayActiveTransactions()\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. Until\n        // this point the batch holds only the truncate delete prefix, so each\n        // re-applied upsert publishes as an insert after it. A key is never\n        // both an optimistic upsert and an optimistic delete.\n        for (const [key, value] of this.optimisticUpserts) {\n          events.push({ type: `insert`, key, value })\n        }\n\n        // The changed-key loop below must not publish these keys again.\n        reappliedKeys = new Set(this.optimisticUpserts.keys())\n      }\n\n      // Now check what actually changed in the final visible state\n      for (const key of changedKeys) {\n        // Truncate already published each re-applied upsert as an insert.\n        if (reappliedKeys?.has(key)) continue\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          })\n        const nextVirtualProps = this.getVirtualPropsSnapshotForState(key)\n        const virtualChanged =\n          previousVirtualProps.$synced !== nextVirtualProps.$synced ||\n          previousVirtualProps.$origin !== nextVirtualProps.$origin\n        const withPreviousVirtualProps = (value: TOutput) =>\n          enrichRowWithVirtualProps(\n            value,\n            key,\n            this.collection.id,\n            () => previousVirtualProps.$synced,\n            () => previousVirtualProps.$origin,\n          )\n\n        if (previousVisibleValue === undefined) {\n          if (newVisibleValue === undefined) continue\n          // Subscribers last saw this key absent, whatever a completed\n          // optimistic request held. Batching composes a buffered delete with\n          // this insert into an update.\n          events.push({ type: `insert`, key, value: newVisibleValue })\n        } else if (newVisibleValue === undefined) {\n          events.push({\n            type: `delete`,\n            key,\n            value: withPreviousVirtualProps(previousVisibleValue),\n          })\n        } else if (\n          virtualChanged ||\n          !deepEquals(previousVisibleValue, newVisibleValue)\n        ) {\n          events.push({\n            type: `update`,\n            key,\n            value: newVisibleValue,\n            previousValue: withPreviousVirtualProps(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      // Subscribers and ready callbacks can throw. Keep the first error so\n      // the applied receipts below still settle.\n      let failure: { error: unknown } | undefined\n      const capture = (step: () => void) => {\n        try {\n          step()\n        } catch (error) {\n          failure ??= { error }\n        }\n      }\n      const visibleLayoutChanged =\n        previousLayout !== undefined &&\n        (previousLayout.length !== this.size ||\n          [...this.keys()].some((key, index) => key !== previousLayout[index]))\n      // markReady may skip its transition, and then the batch still emits.\n      let emitted = false as boolean\n      const emit = () => {\n        emitted = true\n        capture(() =>\n          this.changes.emitEvents(events, true, visibleLayoutChanged),\n        )\n      }\n      // A truncate that makes the Collection ready publishes its batch after\n      // the status reads ready and before status listeners and ready\n      // callbacks run, so their writes follow the batch they describe.\n      if (hasTruncateSync && this.lifecycle.status !== `ready`)\n        capture(() => this.lifecycle.markReady(emit))\n      if (!emitted) emit()\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        this.hasReceivedFirstCommit = true\n      }\n\n      for (const transaction of committedSyncedTransactions) {\n        transaction.applied.resolve()\n      }\n      return { processed: true, failure }\n    }\n\n    return { processed: false }\n  }\n\n  /**\n   * Abandons the open last sync transaction before acceptance. Only\n   * `commit(signal)` with an aborted signal reaches this, so no other\n   * transaction can depend on the one canceled.\n   */\n  public cancelPendingSyncedTransaction(\n    transaction: PendingSyncedTransaction<TOutput, TKey>,\n    reason: Error = new SyncTransactionAbortedError(),\n  ): void {\n    if (\n      transaction.committed ||\n      this.pendingSyncedTransactions.at(-1) !== transaction\n    )\n      throw new SyncQueueInvariantError(\n        `only the open last sync transaction can be canceled`,\n      )\n    this.pendingSyncedTransactions.pop()\n    const canceledKeys = new Set<TKey>()\n    for (const operation of transaction.operations) {\n      canceledKeys.add(operation.key as TKey)\n    }\n    transaction.applied.reject(reason)\n    this.rebuildPendingSyncedProjection()\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, including\n    // metadata-only writes, which the drain also compares.\n    const syncedKeys = new Set<TKey>()\n    for (const transaction of this.pendingSyncedTransactions) {\n      // An open transaction does not publish in this drain.\n      if (!transaction.committed) continue\n      for (const operation of transaction.operations) {\n        syncedKeys.add(operation.key as TKey)\n      }\n      for (const key of transaction.rowMetadataWrites.keys()) {\n        syncedKeys.add(key)\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.hasPersistingTransaction()\n    this.changes.shouldBatchEvents = this.pendingSyncedTransactions.some(\n      (transaction) =>\n        transaction.committed &&\n        (!hasPersistingTransaction || 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.heldOptimisticRows.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.localOnlyDirectWrite = undefined\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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