@tanstack/optimistic/dist/cjs/collection.cjs.map

Core optimistic updates library

{"version":3,"file":"collection.cjs","sources":["../../src/collection.ts"],"sourcesContent":["import { Derived, Store, batch } from \"@tanstack/store\"\nimport { withArrayChangeTracking, withChangeTracking } from \"./proxy\"\nimport { getActiveTransaction } from \"./transactions\"\nimport { SortedMap } from \"./SortedMap\"\nimport type {\n  ChangeMessage,\n  CollectionConfig,\n  InsertConfig,\n  OperationConfig,\n  OptimisticChangeMessage,\n  PendingMutation,\n  StandardSchema,\n  Transaction,\n} from \"./types\"\n\n// Store collections in memory using Tanstack store\nexport const collectionsStore = new Store(new Map<string, Collection<any>>())\n\n// Map to track loading collections\n\nconst loadingCollections = new Map<\n  string,\n  Promise<Collection<Record<string, unknown>>>\n>()\n\ninterface PendingSyncedTransaction<T extends object = Record<string, unknown>> {\n  committed: boolean\n  operations: Array<OptimisticChangeMessage<T>>\n}\n\n/**\n * Preloads a collection with the given configuration\n * Returns a promise that resolves once the sync tool has done its first commit (initial sync is finished)\n * If the collection has already loaded, it resolves immediately\n *\n * This function is useful in route loaders or similar pre-rendering scenarios where you want\n * to ensure data is available before a route transition completes. It uses the same shared collection\n * instance that will be used by useCollection, ensuring data consistency.\n *\n * @example\n * ```typescript\n * // In a route loader\n * async function loader({ params }) {\n *   await preloadCollection({\n *     id: `users-${params.userId}`,\n *     sync: { ... },\n *   });\n *\n *   return null;\n * }\n * ```\n *\n * @template T - The type of items in the collection\n * @param config - Configuration for the collection, including id and sync\n * @returns Promise that resolves when the initial sync is finished\n */\nexport function preloadCollection<T extends object = Record<string, unknown>>(\n  config: CollectionConfig<T>\n): Promise<Collection<T>> {\n  // If the collection is already fully loaded, return a resolved promise\n  if (\n    collectionsStore.state.has(config.id) &&\n    !loadingCollections.has(config.id)\n  ) {\n    return Promise.resolve(\n      collectionsStore.state.get(config.id)! as Collection<T>\n    )\n  }\n\n  // If the collection is in the process of loading, return its promise\n  if (loadingCollections.has(config.id)) {\n    return loadingCollections.get(config.id)! as Promise<Collection<T>>\n  }\n\n  // Create a new collection instance if it doesn't exist\n  if (!collectionsStore.state.has(config.id)) {\n    collectionsStore.setState((prev) => {\n      const next = new Map(prev)\n      next.set(\n        config.id,\n        new Collection<T>({\n          id: config.id,\n          sync: config.sync,\n          schema: config.schema,\n        })\n      )\n      return next\n    })\n  }\n\n  const collection = collectionsStore.state.get(config.id)! as Collection<T>\n\n  // Create a promise that will resolve after the first commit\n  let resolveFirstCommit: () => void\n  const firstCommitPromise = new Promise<Collection<T>>((resolve) => {\n    resolveFirstCommit = () => {\n      resolve(collection)\n    }\n  })\n\n  // Register a one-time listener for the first commit\n  collection.onFirstCommit(() => {\n    if (loadingCollections.has(config.id)) {\n      loadingCollections.delete(config.id)\n      resolveFirstCommit()\n    }\n  })\n\n  // Store the loading promise\n  loadingCollections.set(\n    config.id,\n    firstCommitPromise as Promise<Collection<Record<string, unknown>>>\n  )\n\n  return firstCommitPromise\n}\n\n/**\n * Custom error class for schema validation errors\n */\nexport class SchemaValidationError extends Error {\n  type: `insert` | `update`\n  issues: ReadonlyArray<{\n    message: string\n    path?: ReadonlyArray<string | number | symbol>\n  }>\n\n  constructor(\n    type: `insert` | `update`,\n    issues: ReadonlyArray<{\n      message: string\n      path?: ReadonlyArray<string | number | symbol>\n    }>,\n    message?: string\n  ) {\n    const defaultMessage = `${type === `insert` ? `Insert` : `Update`} validation failed: ${issues\n      .map((issue) => issue.message)\n      .join(`, `)}`\n\n    super(message || defaultMessage)\n    this.name = `SchemaValidationError`\n    this.type = type\n    this.issues = issues\n  }\n}\n\nexport class Collection<T extends object = Record<string, unknown>> {\n  public transactions: Store<SortedMap<string, Transaction>>\n  public optimisticOperations: Derived<Array<OptimisticChangeMessage<T>>>\n  public derivedState: Derived<Map<string, T>>\n  public derivedArray: Derived<Array<T>>\n  public derivedChanges: Derived<Array<ChangeMessage<T>>>\n  private syncedData = new Store<Map<string, T>>(new Map())\n  public syncedMetadata = new Store(new Map<string, unknown>())\n  private pendingSyncedTransactions: Array<PendingSyncedTransaction<T>> = []\n  private syncedKeys = new Set<string>()\n  public config: CollectionConfig<T>\n  private hasReceivedFirstCommit = false\n\n  // WeakMap to associate objects with their keys\n  public objectKeyMap = new WeakMap<object, string>()\n\n  // Array to store one-time commit listeners\n  private onFirstCommitCallbacks: Array<() => void> = []\n\n  /**\n   * Register a callback to be executed on the next commit\n   * Useful for preloading collections\n   * @param callback Function to call after the next commit\n   */\n  public onFirstCommit(callback: () => void): void {\n    this.onFirstCommitCallbacks.push(callback)\n  }\n\n  public id = crypto.randomUUID()\n\n  /**\n   * Creates a new Collection instance\n   *\n   * @param config - Configuration object for the collection\n   * @throws Error if sync config is missing\n   */\n  constructor(config?: CollectionConfig<T>) {\n    if (!config?.sync) {\n      throw new Error(`Collection requires a sync config`)\n    }\n\n    this.transactions = new Store(\n      new SortedMap<string, Transaction>(\n        (a, b) => a.createdAt.getTime() - b.createdAt.getTime()\n      )\n    )\n\n    // Copies of live mutations are stored here and removed once the transaction completes.\n    this.optimisticOperations = new Derived({\n      fn: ({ currDepVals: [transactions] }) => {\n        const result = Array.from(transactions.values())\n          .map((transaction) => {\n            const isActive = ![`completed`, `failed`].includes(\n              transaction.state\n            )\n            return transaction.mutations.map((mutation) => {\n              const message: OptimisticChangeMessage<T> = {\n                type: mutation.type,\n                key: mutation.key,\n                value: mutation.modified as T,\n                isActive,\n              }\n              if (\n                mutation.metadata !== undefined &&\n                mutation.metadata !== null\n              ) {\n                message.metadata = mutation.metadata as Record<string, unknown>\n              }\n              return message\n            })\n          })\n          .flat()\n\n        return result\n      },\n      deps: [this.transactions],\n    })\n    this.optimisticOperations.mount()\n\n    // Combine together synced data & optimistic operations.\n    this.derivedState = new Derived({\n      fn: ({ currDepVals: [syncedData, operations] }) => {\n        const combined = new Map<string, T>(syncedData)\n        const optimisticKeys = new Set<string>()\n\n        // Apply the optimistic operations on top of the synced state.\n        for (const operation of operations) {\n          optimisticKeys.add(operation.key)\n          if (operation.isActive) {\n            switch (operation.type) {\n              case `insert`:\n                combined.set(operation.key, operation.value)\n                break\n              case `update`:\n                combined.set(operation.key, operation.value)\n                break\n              case `delete`:\n                combined.delete(operation.key)\n                break\n            }\n          }\n        }\n\n        // Update object => key mappings\n        optimisticKeys.forEach((key) => {\n          if (combined.has(key)) {\n            this.objectKeyMap.set(combined.get(key)!, key)\n          }\n        })\n\n        return combined\n      },\n      deps: [this.syncedData, this.optimisticOperations],\n    })\n\n    // Create a derived array from the map to avoid recalculating it\n    this.derivedArray = new Derived({\n      fn: ({ currDepVals: [stateMap] }) => {\n        return Array.from(stateMap.values())\n      },\n      deps: [this.derivedState],\n    })\n    this.derivedArray.mount()\n\n    this.derivedChanges = new Derived({\n      fn: ({\n        currDepVals: [derivedState, optimisticOperations],\n        prevDepVals,\n      }) => {\n        const prevDerivedState = prevDepVals?.[0] ?? new Map<string, T>()\n        const changedKeys = new Set(this.syncedKeys)\n        optimisticOperations\n          .flat()\n          .filter((op) => op.isActive)\n          .forEach((op) => changedKeys.add(op.key))\n\n        if (changedKeys.size === 0) {\n          return []\n        }\n\n        const changes: Array<ChangeMessage<T>> = []\n        for (const key of changedKeys) {\n          if (prevDerivedState.has(key) && !derivedState.has(key)) {\n            changes.push({\n              type: `delete`,\n              key,\n              value: prevDerivedState.get(key)!,\n            })\n          } else if (!prevDerivedState.has(key) && derivedState.has(key)) {\n            changes.push({ type: `insert`, key, value: derivedState.get(key)! })\n          } else if (prevDerivedState.has(key) && derivedState.has(key)) {\n            changes.push({\n              type: `update`,\n              key,\n              value: derivedState.get(key)!,\n              previousValue: prevDerivedState.get(key),\n            })\n          }\n        }\n\n        this.syncedKeys.clear()\n\n        return changes\n      },\n      deps: [this.derivedState, this.optimisticOperations],\n    })\n    this.derivedChanges.mount()\n\n    this.config = config\n\n    this.derivedState.mount()\n\n    // Start the sync process\n    config.sync.sync({\n      collection: this,\n      begin: () => {\n        this.pendingSyncedTransactions.push({\n          committed: false,\n          operations: [],\n        })\n      },\n      write: (message: ChangeMessage<T>) => {\n        const pendingTransaction =\n          this.pendingSyncedTransactions[\n            this.pendingSyncedTransactions.length - 1\n          ]\n        if (!pendingTransaction) {\n          throw new Error(`No pending sync transaction to write to`)\n        }\n        if (pendingTransaction.committed) {\n          throw new Error(\n            `The pending sync transaction is already committed, you can't still write to it.`\n          )\n        }\n        pendingTransaction.operations.push(message)\n      },\n      commit: () => {\n        const pendingTransaction =\n          this.pendingSyncedTransactions[\n            this.pendingSyncedTransactions.length - 1\n          ]\n        if (!pendingTransaction) {\n          throw new Error(`No pending sync transaction to commit`)\n        }\n        if (pendingTransaction.committed) {\n          throw new Error(\n            `The pending sync transaction is already committed, you can't commit it again.`\n          )\n        }\n\n        pendingTransaction.committed = true\n\n        this.commitPendingTransactions()\n      },\n    })\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 (\n      !Array.from(this.transactions.state.values()).some(\n        ({ state }) => state === `persisting`\n      )\n    ) {\n      const keys = new Set<string>()\n      batch(() => {\n        for (const transaction of this.pendingSyncedTransactions) {\n          for (const operation of transaction.operations) {\n            keys.add(operation.key)\n            this.syncedKeys.add(operation.key)\n            this.syncedMetadata.setState((prevData) => {\n              switch (operation.type) {\n                case `insert`:\n                  prevData.set(operation.key, operation.metadata)\n                  break\n                case `update`:\n                  prevData.set(operation.key, {\n                    ...prevData.get(operation.key)!,\n                    ...operation.metadata,\n                  })\n                  break\n                case `delete`:\n                  prevData.delete(operation.key)\n                  break\n              }\n              return prevData\n            })\n            this.syncedData.setState((prevData) => {\n              switch (operation.type) {\n                case `insert`:\n                  prevData.set(operation.key, operation.value)\n                  break\n                case `update`:\n                  prevData.set(operation.key, {\n                    ...prevData.get(operation.key)!,\n                    ...operation.value,\n                  })\n                  break\n                case `delete`:\n                  prevData.delete(operation.key)\n                  break\n              }\n              return prevData\n            })\n          }\n        }\n      })\n\n      keys.forEach((key) => {\n        const curValue = this.state.get(key)\n        if (curValue) {\n          this.objectKeyMap.set(curValue, key)\n        }\n      })\n\n      this.pendingSyncedTransactions = []\n\n      // Call any registered one-time commit listeners\n      if (!this.hasReceivedFirstCommit) {\n        this.hasReceivedFirstCommit = true\n        const callbacks = [...this.onFirstCommitCallbacks]\n        this.onFirstCommitCallbacks = []\n        callbacks.forEach((callback) => callback())\n      }\n    }\n  }\n\n  private ensureStandardSchema(schema: unknown): StandardSchema<T> {\n    // If the schema already implements the standard-schema interface, return it\n    if (schema && typeof schema === `object` && `~standard` in schema) {\n      return schema as StandardSchema<T>\n    }\n\n    throw new Error(\n      `Schema must either implement the standard-schema interface or be a Zod schema`\n    )\n  }\n\n  private validateData(\n    data: unknown,\n    type: `insert` | `update`,\n    key?: string\n  ): T | never {\n    if (!this.config.schema) return data as T\n\n    const standardSchema = this.ensureStandardSchema(this.config.schema)\n\n    // For updates, we need to merge with the existing data before validation\n    if (type === `update` && key) {\n      // Get the existing data for this key\n      const existingData = this.state.get(key)\n\n      if (\n        existingData &&\n        data &&\n        typeof data === `object` &&\n        typeof existingData === `object`\n      ) {\n        // Merge the update with the existing data\n        const mergedData = { ...existingData, ...data }\n\n        // Validate the merged data\n        const result = standardSchema[`~standard`].validate(mergedData)\n\n        // Ensure validation is synchronous\n        if (result instanceof Promise) {\n          throw new TypeError(`Schema validation must be synchronous`)\n        }\n\n        // If validation fails, throw a SchemaValidationError with the issues\n        if (`issues` in result && result.issues) {\n          const typedIssues = result.issues.map((issue) => ({\n            message: issue.message,\n            path: issue.path?.map((p) => String(p)),\n          }))\n          throw new SchemaValidationError(type, typedIssues)\n        }\n\n        // Return the original update data, not the merged data\n        // We only used the merged data for validation\n        return data as T\n      }\n    }\n\n    // For inserts or updates without existing data, validate the data directly\n    const result = standardSchema[`~standard`].validate(data)\n\n    // Ensure validation is synchronous\n    if (result instanceof Promise) {\n      throw new TypeError(`Schema validation must be synchronous`)\n    }\n\n    // If validation fails, throw a SchemaValidationError with the issues\n    if (`issues` in result && result.issues) {\n      const typedIssues = result.issues.map((issue) => ({\n        message: issue.message,\n        path: issue.path?.map((p) => String(p)),\n      }))\n      throw new SchemaValidationError(type, typedIssues)\n    }\n\n    return result.value as T\n  }\n\n  private generateKey(data: unknown): string {\n    const str = JSON.stringify(data)\n    let h = 0\n\n    for (let i = 0; i < str.length; i++) {\n      h = (Math.imul(31, h) + str.charCodeAt(i)) | 0\n    }\n\n    return `${this.id}/${Math.abs(h).toString(36)}`\n  }\n\n  /**\n   * Inserts one or more items into the collection\n   * @param items - Single item or array of items to insert\n   * @param config - Optional configuration including metadata and custom keys\n   * @returns A Transaction object representing the insert operation(s)\n   * @throws {SchemaValidationError} If the data fails schema validation\n   * @example\n   * // Insert a single item\n   * insert({ text: \"Buy groceries\", completed: false })\n   *\n   * // Insert multiple items\n   * insert([\n   *   { text: \"Buy groceries\", completed: false },\n   *   { text: \"Walk dog\", completed: false }\n   * ])\n   *\n   * // Insert with custom key\n   * insert({ text: \"Buy groceries\" }, { key: \"grocery-task\" })\n   */\n  insert = (data: T | Array<T>, config?: InsertConfig) => {\n    const transaction = getActiveTransaction()\n    if (typeof transaction === `undefined`) {\n      throw `no transaction found when calling collection.insert`\n    }\n\n    const items = Array.isArray(data) ? data : [data]\n    const mutations: Array<PendingMutation<T>> = []\n\n    // Handle keys - convert to array if string, or generate if not provided\n    let keys: Array<string>\n    if (config?.key) {\n      const configKeys = Array.isArray(config.key) ? config.key : [config.key]\n      // If keys are provided, ensure we have the right number or allow sparse array\n      if (Array.isArray(config.key) && configKeys.length > items.length) {\n        throw new Error(`More keys provided than items to insert`)\n      }\n      keys = items.map((_, i) => configKeys[i] ?? this.generateKey(items[i]))\n    } else {\n      // No keys provided, generate for all items\n      keys = items.map((item) => this.generateKey(item))\n    }\n\n    // Create mutations for each item\n    items.forEach((item, index) => {\n      // Validate the data against the schema if one exists\n      const validatedData = this.validateData(item, `insert`)\n      const key = keys[index]!\n\n      const mutation: PendingMutation<T> = {\n        mutationId: crypto.randomUUID(),\n        original: {},\n        modified: validatedData as Record<string, unknown>,\n        changes: validatedData as Record<string, unknown>,\n        key,\n        metadata: config?.metadata as unknown,\n        syncMetadata: this.config.sync.getSyncMetadata?.() || {},\n        type: `insert`,\n        createdAt: new Date(),\n        updatedAt: new Date(),\n        collection: this,\n      }\n\n      mutations.push(mutation)\n    })\n\n    transaction.applyMutations(mutations)\n\n    this.transactions.setState((sortedMap) => {\n      sortedMap.set(transaction.id, transaction)\n      return sortedMap\n    })\n\n    return transaction\n  }\n\n  /**\n   * Updates one or more items in the collection using a callback function\n   * @param items - Single item/key or array of items/keys to update\n   * @param configOrCallback - Either update configuration or update callback\n   * @param maybeCallback - Update callback if config was provided\n   * @returns A Transaction object representing the update operation(s)\n   * @throws {SchemaValidationError} If the updated data fails schema validation\n   * @example\n   * // Update a single item\n   * update(todo, (draft) => { draft.completed = true })\n   *\n   * // Update multiple items\n   * update([todo1, todo2], (drafts) => {\n   *   drafts.forEach(draft => { draft.completed = true })\n   * })\n   *\n   * // Update with metadata\n   * update(todo, { metadata: { reason: \"user update\" } }, (draft) => { draft.text = \"Updated text\" })\n   */\n\n  update<TItem extends object = T>(\n    item: TItem,\n    configOrCallback: ((draft: TItem) => void) | OperationConfig,\n    maybeCallback?: (draft: TItem) => void\n  ): Transaction\n\n  update<TItem extends object = T>(\n    items: Array<TItem>,\n    configOrCallback: ((draft: Array<TItem>) => void) | OperationConfig,\n    maybeCallback?: (draft: Array<TItem>) => void\n  ): Transaction\n\n  update<TItem extends object = T>(\n    items: TItem | Array<TItem>,\n    configOrCallback: ((draft: TItem | Array<TItem>) => void) | OperationConfig,\n    maybeCallback?: (draft: TItem | Array<TItem>) => void\n  ) {\n    if (typeof items === `undefined`) {\n      throw new Error(`The first argument to update is missing`)\n    }\n\n    const transaction = getActiveTransaction()\n    if (typeof transaction === `undefined`) {\n      throw `no transaction found when calling collection.update`\n    }\n\n    const isArray = Array.isArray(items)\n    const itemsArray = Array.isArray(items) ? items : [items]\n    const callback =\n      typeof configOrCallback === `function` ? configOrCallback : maybeCallback!\n    const config =\n      typeof configOrCallback === `function` ? {} : configOrCallback\n\n    const keys = itemsArray.map((item) => {\n      if (typeof item === `object` && (item as unknown) !== null) {\n        const key = this.objectKeyMap.get(item)\n        if (key === undefined) {\n          throw new Error(`Object not found in collection`)\n        }\n        return key\n      }\n      throw new Error(`Invalid item type for update - must be an object`)\n    })\n\n    // Get the current objects or empty objects if they don't exist\n    const currentObjects = keys.map((key) => ({\n      ...(this.state.get(key) || {}),\n    })) as Array<TItem>\n\n    let changesArray\n    if (isArray) {\n      // Use the proxy to track changes for all objects\n      changesArray = withArrayChangeTracking(\n        currentObjects,\n        callback as (draft: Array<TItem>) => void\n      )\n    } else {\n      const result = withChangeTracking(\n        currentObjects[0] as TItem,\n        callback as (draft: TItem) => void\n      )\n      changesArray = [result]\n    }\n\n    // Create mutations for each object that has changes\n    const mutations: Array<PendingMutation<T>> = keys\n      .map((key, index) => {\n        const changes = changesArray[index]\n\n        // Skip items with no changes\n        if (!changes || Object.keys(changes).length === 0) {\n          return null\n        }\n\n        // Validate the changes for this item\n        const validatedData = this.validateData(changes, `update`, key)\n\n        return {\n          mutationId: crypto.randomUUID(),\n          original: (this.state.get(key) || {}) as Record<string, unknown>,\n          modified: {\n            ...(this.state.get(key) || {}),\n            ...validatedData,\n          } as Record<string, unknown>,\n          changes: validatedData as Record<string, unknown>,\n          key,\n          metadata: config.metadata as unknown,\n          syncMetadata: (this.syncedMetadata.state.get(key) || {}) as Record<\n            string,\n            unknown\n          >,\n          type: `update`,\n          createdAt: new Date(),\n          updatedAt: new Date(),\n          collection: this,\n        }\n      })\n      .filter(Boolean) as Array<PendingMutation<T>>\n\n    // If no changes were made, return early\n    if (mutations.length === 0) {\n      throw new Error(`No changes were made to any of the objects`)\n    }\n\n    transaction.applyMutations(mutations)\n\n    this.transactions.setState((sortedMap) => {\n      sortedMap.set(transaction.id, transaction)\n      return sortedMap\n    })\n\n    return transaction\n  }\n\n  /**\n   * Deletes one or more items from the collection\n   * @param items - Single item/key or array of items/keys to delete\n   * @param config - Optional configuration including metadata\n   * @returns A Transaction object representing the delete operation(s)\n   * @example\n   * // Delete a single item\n   * delete(todo)\n   *\n   * // Delete multiple items\n   * delete([todo1, todo2])\n   *\n   * // Delete with metadata\n   * delete(todo, { metadata: { reason: \"completed\" } })\n   */\n  delete = (\n    items: Array<T | string> | T | string,\n    config?: OperationConfig\n  ) => {\n    const transaction = getActiveTransaction()\n    if (typeof transaction === `undefined`) {\n      throw `no transaction found when calling collection.delete`\n    }\n\n    const itemsArray = Array.isArray(items) ? items : [items]\n    const mutations: Array<PendingMutation<T>> = []\n\n    for (const item of itemsArray) {\n      let key: string\n      if (typeof item === `object` && (item as unknown) !== null) {\n        const objectKey = this.objectKeyMap.get(item)\n        if (objectKey === undefined) {\n          throw new Error(\n            `Object not found in collection: ${JSON.stringify(item)}`\n          )\n        }\n        key = objectKey\n      } else if (typeof item === `string`) {\n        key = item\n      } else {\n        throw new Error(\n          `Invalid item type for delete - must be an object or string key`\n        )\n      }\n\n      const mutation: PendingMutation<T> = {\n        mutationId: crypto.randomUUID(),\n        original: (this.state.get(key) || {}) as Record<string, unknown>,\n        modified: { _deleted: true },\n        changes: { _deleted: true },\n        key,\n        metadata: config?.metadata as unknown,\n        syncMetadata: (this.syncedMetadata.state.get(key) || {}) as Record<\n          string,\n          unknown\n        >,\n        type: `delete`,\n        createdAt: new Date(),\n        updatedAt: new Date(),\n        collection: this,\n      }\n\n      mutations.push(mutation)\n    }\n\n    // Delete object => key mapping.\n    mutations.forEach((mutation) => {\n      const curValue = this.state.get(mutation.key)\n      if (curValue) {\n        this.objectKeyMap.delete(curValue)\n      }\n    })\n\n    transaction.applyMutations(mutations)\n\n    this.transactions.setState((sortedMap) => {\n      sortedMap.set(transaction.id, transaction)\n      return sortedMap\n    })\n\n    return transaction\n  }\n\n  /**\n   * Gets the current state of the collection as a Map\n   *\n   * @returns A Map containing all items in the collection, with keys as identifiers\n   */\n  get state() {\n    return this.derivedState.state\n  }\n\n  /**\n   * Gets the current state of the collection as a Map, but only resolves when data is available\n   * Waits for the first sync commit to complete before resolving\n   *\n   * @returns Promise that resolves to a Map containing all items in the collection\n   */\n  stateWhenReady(): Promise<Map<string, T>> {\n    // If we already have data or there are no loading collections, resolve immediately\n    if (this.state.size > 0 || this.hasReceivedFirstCommit === true) {\n      return Promise.resolve(this.state)\n    }\n\n    // Otherwise, wait for the first commit\n    return new Promise<Map<string, T>>((resolve) => {\n      this.onFirstCommit(() => {\n        resolve(this.state)\n      })\n    })\n  }\n\n  /**\n   * Gets the current state of the collection as an Array\n   *\n   * @returns An Array containing all items in the collection\n   */\n  get toArray() {\n    return this.derivedArray.state\n  }\n\n  /**\n   * Gets the current state of the collection as an Array, but only resolves when data is available\n   * Waits for the first sync commit to complete before resolving\n   *\n   * @returns Promise that resolves to an Array containing all items in the collection\n   */\n  toArrayWhenReady(): Promise<Array<T>> {\n    // If we already have data or there are no loading collections, resolve immediately\n    if (this.toArray.length > 0 || this.hasReceivedFirstCommit === true) {\n      return Promise.resolve(this.toArray)\n    }\n\n    // Otherwise, wait for the first commit\n    return new Promise<Array<T>>((resolve) => {\n      this.onFirstCommit(() => {\n        resolve(this.toArray)\n      })\n    })\n  }\n\n  /**\n   * Returns the current state of the collection as an array of changes\n   * @returns An array of changes\n   */\n  public currentStateAsChanges(): Array<ChangeMessage<T>> {\n    return [...this.state.entries()].map(([key, value]) => ({\n      type: `insert`,\n      key,\n      value,\n    }))\n  }\n\n  /**\n   * Subscribe to changes in the collection\n   * @param callback - A function that will be called with the changes in the collection\n   * @returns A function that can be called to unsubscribe from the changes\n   */\n  public subscribeChanges(\n    callback: (changes: Array<ChangeMessage<T>>) => void\n  ): () => void {\n    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