@tanstack/db/dist/cjs/local-storage.cjs.map

A reactive client store for building super fast apps on sync

{"version":3,"file":"local-storage.cjs","sources":["../../src/local-storage.ts"],"sourcesContent":["import {\n  InvalidStorageDataFormatError,\n  InvalidStorageObjectFormatError,\n  SerializationError,\n  StorageKeyRequiredError,\n} from './errors'\nimport type {\n  BaseCollectionConfig,\n  CollectionConfig,\n  DeleteMutationFnParams,\n  InferSchemaOutput,\n  InsertMutationFnParams,\n  PendingMutation,\n  SyncConfig,\n  UpdateMutationFnParams,\n  UtilsRecord,\n} from './types'\nimport type { StandardSchemaV1 } from '@standard-schema/spec'\n\n/**\n * Storage API interface - subset of DOM Storage that we need\n */\nexport type StorageApi = Pick<Storage, `getItem` | `setItem` | `removeItem`>\n\n/**\n * Storage event API - subset of Window for 'storage' events only\n */\nexport type StorageEventApi = {\n  addEventListener: (\n    type: `storage`,\n    listener: (event: StorageEvent) => void,\n  ) => void\n  removeEventListener: (\n    type: `storage`,\n    listener: (event: StorageEvent) => void,\n  ) => void\n}\n\n/**\n * Internal storage format that includes version tracking\n */\ninterface StoredItem<T> {\n  versionKey: string\n  data: T\n}\n\nexport interface Parser {\n  parse: (data: string) => unknown\n  stringify: (data: unknown) => string\n}\n\n/**\n * Configuration interface for localStorage collection options\n * @template T - The type of items in the collection\n * @template TSchema - The schema type for validation\n * @template TKey - The type of the key returned by `getKey`\n */\nexport interface LocalStorageCollectionConfig<\n  T extends object = object,\n  TSchema extends StandardSchemaV1 = never,\n  TKey extends string | number = string | number,\n> extends BaseCollectionConfig<T, TKey, TSchema> {\n  /**\n   * The key to use for storing the collection data in localStorage/sessionStorage\n   */\n  storageKey: string\n\n  /**\n   * Storage API to use (defaults to window.localStorage)\n   * Can be any object that implements the Storage interface (e.g., sessionStorage)\n   */\n  storage?: StorageApi\n\n  /**\n   * Storage event API to use for cross-tab synchronization (defaults to window)\n   * Can be any object that implements addEventListener/removeEventListener for storage events\n   */\n  storageEventApi?: StorageEventApi\n\n  /**\n   * Parser to use for serializing and deserializing data to and from storage\n   * Defaults to JSON\n   */\n  parser?: Parser\n}\n\n/**\n * Type for the clear utility function\n */\nexport type ClearStorageFn = () => void\n\n/**\n * Type for the getStorageSize utility function\n */\nexport type GetStorageSizeFn = () => number\n\n/**\n * LocalStorage collection utilities type\n */\nexport interface LocalStorageCollectionUtils extends UtilsRecord {\n  clearStorage: ClearStorageFn\n  getStorageSize: GetStorageSizeFn\n  /**\n   * Accepts mutations from a transaction that belong to this collection and persists them to localStorage.\n   * This should be called in your transaction's mutationFn to persist local-storage data.\n   *\n   * @param transaction - The transaction containing mutations to accept\n   * @example\n   * const localSettings = createCollection(localStorageCollectionOptions({...}))\n   *\n   * const tx = createTransaction({\n   *   mutationFn: async ({ transaction }) => {\n   *     // Make API call first\n   *     await api.save(...)\n   *     // Then persist local-storage mutations after success\n   *     localSettings.utils.acceptMutations(transaction)\n   *   }\n   * })\n   */\n  acceptMutations: (transaction: {\n    mutations: Array<PendingMutation<Record<string, unknown>>>\n  }) => void\n}\n\n/**\n * Validates that a value can be JSON serialized\n * @param parser - The parser to use for serialization\n * @param value - The value to validate for JSON serialization\n * @param operation - The operation type being performed (for error messages)\n * @throws Error if the value cannot be JSON serialized\n */\nfunction validateJsonSerializable(\n  parser: Parser,\n  value: any,\n  operation: string,\n): void {\n  try {\n    parser.stringify(value)\n  } catch (error) {\n    throw new SerializationError(\n      operation,\n      error instanceof Error ? error.message : String(error),\n    )\n  }\n}\n\n/**\n * Generate a UUID for version tracking\n * @returns A unique identifier string for tracking data versions\n */\nfunction generateUuid(): string {\n  return crypto.randomUUID()\n}\n\n/**\n * Encodes a key (string or number) into a storage-safe string format.\n * This prevents collisions between numeric and string keys by prefixing with type information.\n *\n * Examples:\n *   - number 1 → \"n:1\"\n *   - string \"1\" → \"s:1\"\n *   - string \"n:1\" → \"s:n:1\"\n *\n * @param key - The key to encode (string or number)\n * @returns Type-prefixed string that is safe for storage\n */\nfunction encodeStorageKey(key: string | number): string {\n  if (typeof key === `number`) {\n    return `n:${key}`\n  }\n  return `s:${key}`\n}\n\n/**\n * Decodes a storage key back to its original form.\n * This is the inverse of encodeStorageKey.\n *\n * @param encodedKey - The encoded key from storage\n * @returns The original key (string or number)\n */\nfunction decodeStorageKey(encodedKey: string): string | number {\n  if (encodedKey.startsWith(`n:`)) {\n    return Number(encodedKey.slice(2))\n  }\n  if (encodedKey.startsWith(`s:`)) {\n    return encodedKey.slice(2)\n  }\n  // Fallback for legacy data without encoding\n  return encodedKey\n}\n\n/**\n * Creates an in-memory storage implementation that mimics the StorageApi interface\n * Used as a fallback when localStorage is not available (e.g., server-side rendering)\n * @returns An object implementing the StorageApi interface using an in-memory Map\n */\nfunction createInMemoryStorage(): StorageApi {\n  const storage = new Map<string, string>()\n\n  return {\n    getItem(key: string): string | null {\n      return storage.get(key) ?? null\n    },\n    setItem(key: string, value: string): void {\n      storage.set(key, value)\n    },\n    removeItem(key: string): void {\n      storage.delete(key)\n    },\n  }\n}\n\n/**\n * Creates a no-op storage event API for environments without window (e.g., server-side)\n * This provides the required interface but doesn't actually listen to any events\n * since cross-tab synchronization is not possible in server environments\n * @returns An object implementing the StorageEventApi interface with no-op methods\n */\nfunction createNoOpStorageEventApi(): StorageEventApi {\n  return {\n    addEventListener: () => {\n      // No-op: cannot listen to storage events without window\n    },\n    removeEventListener: () => {\n      // No-op: cannot remove listeners without window\n    },\n  }\n}\n\n/**\n * Creates localStorage collection options for use with a standard Collection\n *\n * This function creates a collection that persists data to localStorage/sessionStorage\n * and synchronizes changes across browser tabs using storage events.\n *\n * **Fallback Behavior:**\n *\n * When localStorage is not available (e.g., in server-side rendering environments),\n * this function automatically falls back to an in-memory storage implementation.\n * This prevents errors during module initialization and allows the collection to\n * work in any environment, though data will not persist across page reloads or\n * be shared across tabs when using the in-memory fallback.\n *\n * **Using with Manual Transactions:**\n *\n * For manual transactions, you must call `utils.acceptMutations()` in your transaction's `mutationFn`\n * to persist changes made during `tx.mutate()`. This is necessary because local-storage collections\n * don't participate in the standard mutation handler flow for manual transactions.\n *\n * @template TExplicit - The explicit type of items in the collection (highest priority)\n * @template TSchema - The schema type for validation and type inference (second priority)\n * @template TFallback - The fallback type if no explicit or schema type is provided\n * @param config - Configuration options for the localStorage collection\n * @returns Collection options with utilities including clearStorage, getStorageSize, and acceptMutations\n *\n * @example\n * // Basic localStorage collection\n * const collection = createCollection(\n *   localStorageCollectionOptions({\n *     storageKey: 'todos',\n *     getKey: (item) => item.id,\n *   })\n * )\n *\n * @example\n * // localStorage collection with custom storage\n * const collection = createCollection(\n *   localStorageCollectionOptions({\n *     storageKey: 'todos',\n *     storage: window.sessionStorage, // Use sessionStorage instead\n *     getKey: (item) => item.id,\n *   })\n * )\n *\n * @example\n * // localStorage collection with mutation handlers\n * const collection = createCollection(\n *   localStorageCollectionOptions({\n *     storageKey: 'todos',\n *     getKey: (item) => item.id,\n *     onInsert: async ({ transaction }) => {\n *       console.log('Item inserted:', transaction.mutations[0].modified)\n *     },\n *   })\n * )\n *\n * @example\n * // Using with manual transactions\n * const localSettings = createCollection(\n *   localStorageCollectionOptions({\n *     storageKey: 'user-settings',\n *     getKey: (item) => item.id,\n *   })\n * )\n *\n * const tx = createTransaction({\n *   mutationFn: async ({ transaction }) => {\n *     // Use settings data in API call\n *     const settingsMutations = transaction.mutations.filter(m => m.collection === localSettings)\n *     await api.updateUserProfile({ settings: settingsMutations[0]?.modified })\n *\n *     // Persist local-storage mutations after API success\n *     localSettings.utils.acceptMutations(transaction)\n *   }\n * })\n *\n * tx.mutate(() => {\n *   localSettings.insert({ id: 'theme', value: 'dark' })\n *   apiCollection.insert({ id: 2, data: 'profile data' })\n * })\n *\n * await tx.commit()\n */\n\n// Overload for when schema is provided\nexport function localStorageCollectionOptions<\n  T extends StandardSchemaV1,\n  TKey extends string | number = string | number,\n>(\n  config: LocalStorageCollectionConfig<InferSchemaOutput<T>, T, TKey> & {\n    schema: T\n  },\n): CollectionConfig<\n  InferSchemaOutput<T>,\n  TKey,\n  T,\n  LocalStorageCollectionUtils\n> & {\n  id: string\n  utils: LocalStorageCollectionUtils\n  schema: T\n}\n\n// Overload for when no schema is provided\n// the type T needs to be passed explicitly unless it can be inferred from the getKey function in the config\nexport function localStorageCollectionOptions<\n  T extends object,\n  TKey extends string | number = string | number,\n>(\n  config: LocalStorageCollectionConfig<T, never, TKey> & {\n    schema?: never // prohibit schema\n  },\n): CollectionConfig<T, TKey, never, LocalStorageCollectionUtils> & {\n  id: string\n  utils: LocalStorageCollectionUtils\n  schema?: never // no schema in the result\n}\n\nexport function localStorageCollectionOptions(\n  config: LocalStorageCollectionConfig<any, any, string | number>,\n): Omit<\n  CollectionConfig<any, string | number, any, LocalStorageCollectionUtils>,\n  `id`\n> & {\n  id: string\n  utils: LocalStorageCollectionUtils\n  schema?: StandardSchemaV1\n} {\n  // Validate required parameters\n  if (!config.storageKey) {\n    throw new StorageKeyRequiredError()\n  }\n\n  // Default to window.localStorage if no storage is provided\n  // Fall back to in-memory storage if localStorage is not available (e.g., server-side rendering)\n  const storage =\n    config.storage ||\n    (typeof window !== `undefined` ? window.localStorage : null) ||\n    createInMemoryStorage()\n\n  // Default to window for storage events if not provided\n  // Fall back to no-op storage event API if window is not available (e.g., server-side rendering)\n  const storageEventApi =\n    config.storageEventApi ||\n    (typeof window !== `undefined` ? window : null) ||\n    createNoOpStorageEventApi()\n\n  // Default to JSON parser if no parser is provided\n  const parser = config.parser || JSON\n\n  // Track the last known state to detect changes\n  const lastKnownData = new Map<string | number, StoredItem<any>>()\n\n  // Create the sync configuration\n  const sync = createLocalStorageSync<any>(\n    config.storageKey,\n    storage,\n    storageEventApi,\n    parser,\n    config.getKey,\n    lastKnownData,\n  )\n\n  /**\n   * Save data to storage\n   * @param dataMap - Map of items with version tracking to save to storage\n   */\n  const saveToStorage = (\n    dataMap: Map<string | number, StoredItem<any>>,\n  ): void => {\n    try {\n      // Convert Map to object format for storage\n      const objectData: Record<string, StoredItem<any>> = {}\n      dataMap.forEach((storedItem, key) => {\n        objectData[encodeStorageKey(key)] = storedItem\n      })\n      const serialized = parser.stringify(objectData)\n      storage.setItem(config.storageKey, serialized)\n    } catch (error) {\n      console.error(\n        `[LocalStorageCollection] Error saving data to storage key \"${config.storageKey}\":`,\n        error,\n      )\n      throw error\n    }\n  }\n\n  /**\n   * Removes all collection data from the configured storage\n   */\n  const clearStorage: ClearStorageFn = (): void => {\n    storage.removeItem(config.storageKey)\n  }\n\n  /**\n   * Get the size of the stored data in bytes (approximate)\n   * @returns The approximate size in bytes of the stored collection data\n   */\n  const getStorageSize: GetStorageSizeFn = (): number => {\n    const data = storage.getItem(config.storageKey)\n    return data ? new Blob([data]).size : 0\n  }\n\n  /*\n   * Create wrapper handlers for direct persistence operations that perform actual storage operations\n   * Wraps the user's onInsert handler to also save changes to localStorage\n   */\n  const wrappedOnInsert = async (params: InsertMutationFnParams<any>) => {\n    // Validate that all values in the transaction can be JSON serialized\n    params.transaction.mutations.forEach((mutation) => {\n      validateJsonSerializable(parser, mutation.modified, `insert`)\n    })\n\n    // Call the user handler BEFORE persisting changes (if provided)\n    let handlerResult: any = {}\n    if (config.onInsert) {\n      handlerResult = (await config.onInsert(params)) ?? {}\n    }\n\n    // Always persist to storage\n    // Use lastKnownData (in-memory cache) instead of reading from storage\n    // Add new items with version keys\n    params.transaction.mutations.forEach((mutation) => {\n      // Use the engine's pre-computed key for consistency\n      const storedItem: StoredItem<any> = {\n        versionKey: generateUuid(),\n        data: mutation.modified,\n      }\n      lastKnownData.set(mutation.key, storedItem)\n    })\n\n    // Save to storage\n    saveToStorage(lastKnownData)\n\n    // Confirm mutations through sync interface (moves from optimistic to synced state)\n    // without reloading from storage\n    sync.confirmOperationsSync(params.transaction.mutations)\n\n    return handlerResult\n  }\n\n  const wrappedOnUpdate = async (params: UpdateMutationFnParams<any>) => {\n    // Validate that all values in the transaction can be JSON serialized\n    params.transaction.mutations.forEach((mutation) => {\n      validateJsonSerializable(parser, mutation.modified, `update`)\n    })\n\n    // Call the user handler BEFORE persisting changes (if provided)\n    let handlerResult: any = {}\n    if (config.onUpdate) {\n      handlerResult = (await config.onUpdate(params)) ?? {}\n    }\n\n    // Always persist to storage\n    // Use lastKnownData (in-memory cache) instead of reading from storage\n    // Update items with new version keys\n    params.transaction.mutations.forEach((mutation) => {\n      // Use the engine's pre-computed key for consistency\n      const storedItem: StoredItem<any> = {\n        versionKey: generateUuid(),\n        data: mutation.modified,\n      }\n      lastKnownData.set(mutation.key, storedItem)\n    })\n\n    // Save to storage\n    saveToStorage(lastKnownData)\n\n    // Confirm mutations through sync interface (moves from optimistic to synced state)\n    // without reloading from storage\n    sync.confirmOperationsSync(params.transaction.mutations)\n\n    return handlerResult\n  }\n\n  const wrappedOnDelete = async (params: DeleteMutationFnParams<any>) => {\n    // Call the user handler BEFORE persisting changes (if provided)\n    let handlerResult: any = {}\n    if (config.onDelete) {\n      handlerResult = (await config.onDelete(params)) ?? {}\n    }\n\n    // Always persist to storage\n    // Use lastKnownData (in-memory cache) instead of reading from storage\n    // Remove items\n    params.transaction.mutations.forEach((mutation) => {\n      // Use the engine's pre-computed key for consistency\n      lastKnownData.delete(mutation.key)\n    })\n\n    // Save to storage\n    saveToStorage(lastKnownData)\n\n    // Confirm mutations through sync interface (moves from optimistic to synced state)\n    // without reloading from storage\n    sync.confirmOperationsSync(params.transaction.mutations)\n\n    return handlerResult\n  }\n\n  // Extract standard Collection config properties\n  const {\n    storageKey: _storageKey,\n    storage: _storage,\n    storageEventApi: _storageEventApi,\n    onInsert: _onInsert,\n    onUpdate: _onUpdate,\n    onDelete: _onDelete,\n    id,\n    ...restConfig\n  } = config\n\n  // Default id to a pattern based on storage key if not provided\n  const collectionId = id ?? `local-collection:${config.storageKey}`\n\n  /**\n   * Accepts mutations from a transaction that belong to this collection and persists them to storage\n   */\n  const acceptMutations = (transaction: {\n    mutations: Array<PendingMutation<Record<string, unknown>>>\n  }) => {\n    // Filter mutations that belong to this collection\n    // Use collection ID for filtering if collection reference isn't available yet\n    const collectionMutations = transaction.mutations.filter((m) => {\n      // Try to match by collection reference first\n      if (sync.collection && m.collection === sync.collection) {\n        return true\n      }\n      // Fall back to matching by collection ID\n      return m.collection.id === collectionId\n    })\n\n    if (collectionMutations.length === 0) {\n      return\n    }\n\n    // Validate all mutations can be serialized before modifying storage\n    for (const mutation of collectionMutations) {\n      switch (mutation.type) {\n        case `insert`:\n        case `update`:\n          validateJsonSerializable(parser, mutation.modified, mutation.type)\n          break\n        case `delete`:\n          validateJsonSerializable(parser, mutation.original, mutation.type)\n          break\n      }\n    }\n\n    // Use lastKnownData (in-memory cache) instead of reading from storage\n    // Apply each mutation\n    for (const mutation of collectionMutations) {\n      // Use the engine's pre-computed key to avoid key derivation issues\n      switch (mutation.type) {\n        case `insert`:\n        case `update`: {\n          const storedItem: StoredItem<Record<string, unknown>> = {\n            versionKey: generateUuid(),\n            data: mutation.modified,\n          }\n          lastKnownData.set(mutation.key, storedItem)\n          break\n        }\n        case `delete`: {\n          lastKnownData.delete(mutation.key)\n          break\n        }\n      }\n    }\n\n    // Save to storage\n    saveToStorage(lastKnownData)\n\n    // Confirm the mutations in the collection to move them from optimistic to synced state\n    // This writes them through the sync interface to make them \"synced\" instead of \"optimistic\"\n    sync.confirmOperationsSync(collectionMutations)\n  }\n\n  return {\n    ...restConfig,\n    id: collectionId,\n    sync,\n    onInsert: wrappedOnInsert,\n    onUpdate: wrappedOnUpdate,\n    onDelete: wrappedOnDelete,\n    utils: {\n      clearStorage,\n      getStorageSize,\n      acceptMutations,\n    },\n  }\n}\n\n/**\n * Load data from storage and return as a Map\n * @param parser - The parser to use for deserializing the data\n * @param storageKey - The key used to store data in the storage API\n * @param storage - The storage API to load from (localStorage, sessionStorage, etc.)\n * @returns Map of stored items with version tracking, or empty Map if loading fails\n */\nfunction loadFromStorage<T extends object>(\n  storageKey: string,\n  storage: StorageApi,\n  parser: Parser,\n): Map<string | number, StoredItem<T>> {\n  try {\n    const rawData = storage.getItem(storageKey)\n    if (!rawData) {\n      return new Map()\n    }\n\n    const parsed = parser.parse(rawData)\n    const dataMap = new Map<string | number, StoredItem<T>>()\n\n    // Handle object format where keys map to StoredItem values\n    if (\n      typeof parsed === `object` &&\n      parsed !== null &&\n      !Array.isArray(parsed)\n    ) {\n      Object.entries(parsed).forEach(([encodedKey, value]) => {\n        // Runtime check to ensure the value has the expected StoredItem structure\n        if (\n          value &&\n          typeof value === `object` &&\n          `versionKey` in value &&\n          `data` in value\n        ) {\n          const storedItem = value as StoredItem<T>\n          const decodedKey = decodeStorageKey(encodedKey)\n          dataMap.set(decodedKey, storedItem)\n        } else {\n          throw new InvalidStorageDataFormatError(storageKey, encodedKey)\n        }\n      })\n    } else {\n      throw new InvalidStorageObjectFormatError(storageKey)\n    }\n\n    return dataMap\n  } catch (error) {\n    console.warn(\n      `[LocalStorageCollection] Error loading data from storage key \"${storageKey}\":`,\n      error,\n    )\n    return new Map()\n  }\n}\n\n/**\n * Internal function to create localStorage sync configuration\n * Creates a sync configuration that handles localStorage persistence and cross-tab synchronization\n * @param storageKey - The key used for storing data in localStorage\n * @param storage - The storage API to use (localStorage, sessionStorage, etc.)\n * @param storageEventApi - The event API for listening to storage changes\n * @param getKey - Function to extract the key from an item\n * @param lastKnownData - Map tracking the last known state for change detection\n * @returns Sync configuration with manual trigger capability\n */\nfunction createLocalStorageSync<T extends object>(\n  storageKey: string,\n  storage: StorageApi,\n  storageEventApi: StorageEventApi,\n  parser: Parser,\n  _getKey: (item: T) => string | number,\n  lastKnownData: Map<string | number, StoredItem<T>>,\n): SyncConfig<T> & {\n  manualTrigger?: () => void\n  collection: any\n  confirmOperationsSync: (mutations: Array<any>) => void\n} {\n  let syncParams: Parameters<SyncConfig<T>[`sync`]>[0] | null = null\n  let collection: any = null\n\n  /**\n   * Compare two Maps to find differences using version keys\n   * @param oldData - The previous state of stored items\n   * @param newData - The current state of stored items\n   * @returns Array of changes with type, key, and value information\n   */\n  const findChanges = (\n    oldData: Map<string | number, StoredItem<T>>,\n    newData: Map<string | number, StoredItem<T>>,\n  ): Array<{\n    type: `insert` | `update` | `delete`\n    key: string | number\n    value?: T\n  }> => {\n    const changes: Array<{\n      type: `insert` | `update` | `delete`\n      key: string | number\n      value?: T\n    }> = []\n\n    // Check for deletions and updates\n    oldData.forEach((oldStoredItem, key) => {\n      const newStoredItem = newData.get(key)\n      if (!newStoredItem) {\n        changes.push({ type: `delete`, key, value: oldStoredItem.data })\n      } else if (oldStoredItem.versionKey !== newStoredItem.versionKey) {\n        changes.push({ type: `update`, key, value: newStoredItem.data })\n      }\n    })\n\n    // Check for insertions\n    newData.forEach((newStoredItem, key) => {\n      if (!oldData.has(key)) {\n        changes.push({ type: `insert`, key, value: newStoredItem.data })\n      }\n    })\n\n    return changes\n  }\n\n  /**\n   * Process storage changes and update collection\n   * Loads new data from storage, compares with last known state, and applies changes\n   */\n  const processStorageChanges = () => {\n    if (!syncParams) return\n\n    const { begin, write, commit } = syncParams\n\n    // Load the new data\n    const newData = loadFromStorage<T>(storageKey, storage, parser)\n\n    // Find the specific changes\n    const changes = findChanges(lastKnownData, newData)\n\n    if (changes.length > 0) {\n      begin()\n      changes.forEach(({ type, value }) => {\n        if (value) {\n          validateJsonSerializable(parser, value, type)\n          write({ type, value })\n        }\n      })\n      commit()\n\n      // Update lastKnownData\n      lastKnownData.clear()\n      newData.forEach((storedItem, key) => {\n        lastKnownData.set(key, storedItem)\n      })\n    }\n  }\n\n  const syncConfig: SyncConfig<T> & {\n    manualTrigger?: () => void\n    collection: any\n  } = {\n    sync: (params: Parameters<SyncConfig<T>[`sync`]>[0]) => {\n      const { begin, write, commit, markReady } = params\n\n      // Store sync params and collection for later use\n      syncParams = params\n      collection = params.collection\n\n      // Initial load\n      const initialData = loadFromStorage<T>(storageKey, storage, parser)\n      if (initialData.size > 0) {\n        begin()\n        initialData.forEach((storedItem) => {\n          validateJsonSerializable(parser, storedItem.data, `load`)\n          write({ type: `insert`, value: storedItem.data })\n        })\n        commit()\n      }\n\n      // Update lastKnownData\n      lastKnownData.clear()\n      initialData.forEach((storedItem, key) => {\n        lastKnownData.set(key, storedItem)\n      })\n\n      // Mark collection as ready after initial load\n      markReady()\n\n      // Listen for storage events from other tabs\n      const handleStorageEvent = (event: StorageEvent) => {\n        // Only respond to changes to our specific key and from our storage\n        if (event.key !== storageKey || event.storageArea !== storage) {\n          return\n        }\n\n        processStorageChanges()\n      }\n\n      // Add storage event listener for cross-tab sync\n      storageEventApi.addEventListener(`storage`, handleStorageEvent)\n\n      // Note: Cleanup is handled automatically by the collection when it's disposed\n    },\n\n    /**\n     * Get sync metadata - returns storage key information\n     * @returns Object containing storage key and storage type metadata\n     */\n    getSyncMetadata: () => ({\n      storageKey,\n      storageType:\n        storage === (typeof window !== `undefined` ? window.localStorage : null)\n          ? `localStorage`\n          : `custom`,\n    }),\n\n    // Manual trigger function for local updates\n    manualTrigger: processStorageChanges,\n\n    // Collection instance reference\n    collection,\n  }\n\n  /**\n   * Confirms mutations by writing them through the sync interface\n   * This moves mutations from optimistic to synced state\n   * @param mutations - Array of mutation objects to confirm\n   */\n  const confirmOperationsSync = (mutations: Array<any>) => {\n    if (!syncParams) {\n      // Sync not initialized yet, mutations will be handled on next sync\n      return\n    }\n\n    const { begin, write, commit } = syncParams\n\n    // Write the mutations through sync to confirm them\n    begin()\n    mutations.forEach((mutation: any) => {\n      write({\n        type: mutation.type,\n        value:\n          mutation.type === `delete` ? mutation.original : mutation.modified,\n      })\n    })\n    commit()\n  }\n\n  return {\n    ...syncConfig,\n    confirmOperationsSync,\n  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