@tanstack/db/dist/cjs/collection/state.cjs.map

A reactive client store for building super fast apps on sync

{"version":3,"file":"state.cjs","sources":["../../../src/collection/state.ts"],"sourcesContent":["import { deepEquals } from '../utils'\nimport { SortedMap } from '../SortedMap'\nimport type { Transaction } from '../transactions'\nimport type { StandardSchemaV1 } from '@standard-schema/spec'\nimport type {\n  ChangeMessage,\n  CollectionConfig,\n  OptimisticChangeMessage,\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'\n\ninterface PendingSyncedTransaction<\n  T extends object = Record<string, unknown>,\n  TKey extends string | number = string | number,\n> {\n  committed: boolean\n  operations: Array<OptimisticChangeMessage<T>>\n  truncate?: boolean\n  deletedKeys: Set<string | number>\n  optimisticSnapshot?: {\n    upserts: Map<TKey, T>\n    deletes: Set<TKey>\n  }\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>\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  public syncedData: SortedMap<TKey, TOutput>\n  public syncedMetadata = new Map<TKey, unknown>()\n\n  // Optimistic state tracking - make public for testing\n  public optimisticUpserts = new Map<TKey, TOutput>()\n  public optimisticDeletes = new Set<TKey>()\n\n  // Cached size for performance\n  public size = 0\n\n  // State used for computing the change events\n  public syncedKeys = new Set<TKey>()\n  public preSyncVisibleState = new Map<TKey, TOutput>()\n  public recentlySyncedKeys = new Set<TKey>()\n  public hasReceivedFirstCommit = false\n  public isCommittingSyncTransactions = false\n\n  /**\n   * Creates a new CollectionState manager\n   */\n  constructor(config: CollectionConfig<TOutput, TKey, TSchema>) {\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   * 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\n    // Clear current optimistic state\n    this.optimisticUpserts.clear()\n    this.optimisticDeletes.clear()\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) && mutation.optimistic) {\n          switch (mutation.type) {\n            case `insert`:\n            case `update`:\n              this.optimisticUpserts.set(\n                mutation.key,\n                mutation.modified as TOutput,\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<ChangeMessage<TOutput, TKey>> = []\n    this.collectOptimisticChanges(previousState, previousDeletes, events)\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.pendingSyncedTransactions.length > 0 && !triggeredByUserAction) {\n      const pendingSyncKeys = 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          pendingSyncKeys.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 (event.type === `delete` && pendingSyncKeys.has(event.key)) {\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    events: Array<ChangeMessage<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\n      if (previousValue !== undefined && currentValue === undefined) {\n        events.push({ type: `delete`, key, value: previousValue })\n      } else if (previousValue === undefined && currentValue !== undefined) {\n        events.push({ type: `insert`, key, value: currentValue })\n      } else if (\n        previousValue !== undefined &&\n        currentValue !== undefined &&\n        previousValue !== currentValue\n      ) {\n        events.push({\n          type: `update`,\n          key,\n          value: currentValue,\n          previousValue,\n        })\n      }\n    }\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  /**\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    // 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    } = this.pendingSyncedTransactions.reduce(\n      (acc, t) => {\n        if (t.committed) {\n          acc.committedSyncedTransactions.push(t)\n          if (t.truncate === true) {\n            acc.hasTruncateSync = 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      },\n    )\n\n    if (!hasPersistingTransaction || hasTruncateSync) {\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\n      // First collect all keys that will be affected by sync operations\n      const changedKeys = new Set<TKey>()\n      for (const transaction of committedSyncedTransactions) {\n        for (const operation of transaction.operations) {\n          changedKeys.add(operation.key as TKey)\n        }\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>()\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      const rowUpdateMode = this.config.sync.rowUpdateMode || `partial`\n\n      for (const transaction of committedSyncedTransactions) {\n        // Handle truncate operations first\n        if (transaction.truncate) {\n          // TRUNCATE PHASE\n          // 1) Emit a delete for every visible key (synced + optimistic) so downstream listeners/indexes\n          //    observe a clear-before-rebuild. We intentionally skip keys already in\n          //    optimisticDeletes because their delete was previously emitted by the user.\n          // Use the snapshot to ensure we emit deletes for all items that existed at truncate start.\n          const visibleKeys = new Set([\n            ...this.syncedData.keys(),\n            ...(truncateOptimisticSnapshot?.upserts.keys() || []),\n          ])\n          for (const key of visibleKeys) {\n            if (truncateOptimisticSnapshot?.deletes.has(key)) continue\n            const previousValue =\n              truncateOptimisticSnapshot?.upserts.get(key) ||\n              this.syncedData.get(key)\n            if (previousValue !== undefined) {\n              events.push({ type: `delete`, key, value: previousValue })\n            }\n          }\n\n          // 2) Clear the authoritative synced base. Subsequent server ops in this\n          //    same commit will rebuild the base atomically.\n          this.syncedData.clear()\n          this.syncedMetadata.clear()\n          this.syncedKeys.clear()\n\n          // 3) 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          // 4) 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        for (const operation of transaction.operations) {\n          const key = operation.key as TKey\n          this.syncedKeys.add(key)\n\n          // Update metadata\n          switch (operation.type) {\n            case `insert`:\n              this.syncedMetadata.set(key, operation.metadata)\n              break\n            case `update`:\n              this.syncedMetadata.set(\n                key,\n                Object.assign(\n                  {},\n                  this.syncedMetadata.get(key),\n                  operation.metadata,\n                ),\n              )\n              break\n            case `delete`:\n              this.syncedMetadata.delete(key)\n              break\n          }\n\n          // Update synced data\n          switch (operation.type) {\n            case `insert`:\n              this.syncedData.set(key, operation.value)\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)\n              } else {\n                this.syncedData.set(key, operation.value)\n              }\n              break\n            }\n            case `delete`:\n              this.syncedData.delete(key)\n              break\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        // Avoid duplicating keys that were inserted/updated by synced operations in this commit\n        const syncedInsertedOrUpdatedKeys = new Set<TKey>()\n        for (const t of committedSyncedTransactions) {\n          for (const op of t.operations) {\n            if (op.type === `insert` || op.type === `update`) {\n              syncedInsertedOrUpdatedKeys.add(op.key as TKey)\n            }\n          }\n        }\n\n        // Build re-apply sets from the snapshot taken at the start of this function.\n        // This prevents losing optimistic state if transactions complete during truncate processing.\n        const reapplyUpserts = new Map<TKey, TOutput>(\n          truncateOptimisticSnapshot!.upserts,\n        )\n        const reapplyDeletes = new Set<TKey>(\n          truncateOptimisticSnapshot!.deletes,\n        )\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      // 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, value] of truncateOptimisticSnapshot.upserts) {\n          this.optimisticUpserts.set(key, value)\n        }\n        for (const key of truncateOptimisticSnapshot.deletes) {\n          this.optimisticDeletes.add(key)\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            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                    mutation.modified as TOutput,\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      // Check for redundant sync operations that match completed optimistic operations\n      const completedOptimisticOps = new Map<TKey, any>()\n\n      for (const transaction of this.transactions.values()) {\n        if (transaction.state === `completed`) {\n          for (const mutation of transaction.mutations) {\n            if (\n              mutation.optimistic &&\n              this.isThisCollection(mutation.collection) &&\n              changedKeys.has(mutation.key)\n            ) {\n              completedOptimisticOps.set(mutation.key, {\n                type: mutation.type,\n                value: mutation.modified,\n              })\n            }\n          }\n        }\n      }\n\n      // Now check what actually changed in the final visible state\n      for (const key of changedKeys) {\n        const previousVisibleValue = currentVisibleState.get(key)\n        const newVisibleValue = this.get(key) // This returns the new derived state\n\n        // Check if this sync operation is redundant with a completed optimistic operation\n        const completedOp = completedOptimisticOps.get(key)\n        let isRedundantSync = false\n\n        if (completedOp) {\n          if (\n            completedOp.type === `delete` &&\n            previousVisibleValue !== undefined &&\n            newVisibleValue === undefined &&\n            deepEquals(completedOp.value, previousVisibleValue)\n          ) {\n            isRedundantSync = true\n          } else if (\n            newVisibleValue !== undefined &&\n            deepEquals(completedOp.value, newVisibleValue)\n          ) {\n            isRedundantSync = true\n          }\n        }\n\n        if (!isRedundantSync) {\n          if (\n            previousVisibleValue === undefined &&\n            newVisibleValue !== undefined\n          ) {\n            events.push({\n              type: `insert`,\n              key,\n              value: newVisibleValue,\n            })\n          } else if (\n            previousVisibleValue !== undefined &&\n            newVisibleValue === undefined\n          ) {\n            events.push({\n              type: `delete`,\n              key,\n              value: previousVisibleValue,\n            })\n          } else if (\n            previousVisibleValue !== undefined &&\n            newVisibleValue !== undefined &&\n            !deepEquals(previousVisibleValue, newVisibleValue)\n          ) {\n            events.push({\n              type: `update`,\n              key,\n              value: newVisibleValue,\n              previousValue: previousVisibleValue,\n            })\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      this.changes.emitEvents(events, true)\n\n      this.pendingSyncedTransactions = uncommittedSyncedTransactions\n\n      // Clear the pre-sync state since sync operations are complete\n      this.preSyncVisibleState.clear()\n\n      // Clear recently synced keys after a microtask to allow recomputeOptimisticState to see them\n      Promise.resolve().then(() => {\n        this.recentlySyncedKeys.clear()\n      })\n\n      // Mark that we've received the first commit (for tracking purposes)\n      if (!this.hasReceivedFirstCommit) {\n        this.hasReceivedFirstCommit = true\n      }\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        // This empty catch block is necessary to prevent unhandled promise rejections.\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        if (currentValue !== undefined) {\n          this.preSyncVisibleState.set(key, currentValue)\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    // Check if commitPendingTransactions will be called after this\n    // by checking if there are pending sync transactions (same logic as in transactions.ts)\n    this.changes.shouldBatchEvents = this.pendingSyncedTransactions.length > 0\n\n    // CRITICAL: Capture visible state BEFORE clearing optimistic state\n    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.syncedData.clear()\n    this.syncedMetadata.clear()\n    this.optimisticUpserts.clear()\n    this.optimisticDeletes.clear()\n    this.size = 0\n    this.pendingSyncedTransactions = []\n    this.syncedKeys.clear()\n    this.hasReceivedFirstCommit = false\n  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