@tanstack/db-collections/dist/cjs/electric.cjs.map

A collection for (aspirationally) every way of loading your data

{"version":3,"file":"electric.cjs","sources":["../../src/electric.ts"],"sourcesContent":["import {\n  ShapeStream,\n  isChangeMessage,\n  isControlMessage,\n} from \"@electric-sql/client\"\nimport { Store } from \"@tanstack/store\"\nimport DebugModule from \"debug\"\nimport type {\n  CollectionConfig,\n  DeleteMutationFnParams,\n  InsertMutationFnParams,\n  SyncConfig,\n  UpdateMutationFnParams,\n  UtilsRecord,\n} from \"@tanstack/db\"\nimport type { StandardSchemaV1 } from \"@standard-schema/spec\"\nimport type {\n  ControlMessage,\n  GetExtensions,\n  Message,\n  Row,\n  ShapeStreamOptions,\n} from \"@electric-sql/client\"\n\nconst debug = DebugModule.debug(`ts/db:electric`)\n\n/**\n * Type representing a transaction ID in Electric SQL\n */\nexport type Txid = number\n\n// The `InferSchemaOutput` and `ResolveType` are copied from the `@tanstack/db` package\n// but we modified `InferSchemaOutput` slightly to restrict the schema output to `Row<unknown>`\n// This is needed in order for `GetExtensions` to be able to infer the parser extensions type from the schema\ntype InferSchemaOutput<T> = T extends StandardSchemaV1\n  ? StandardSchemaV1.InferOutput<T> extends Row<unknown>\n    ? StandardSchemaV1.InferOutput<T>\n    : Record<string, unknown>\n  : Record<string, unknown>\n\ntype ResolveType<\n  TExplicit extends Row<unknown> = Row<unknown>,\n  TSchema extends StandardSchemaV1 = never,\n  TFallback extends object = Record<string, unknown>,\n> =\n  unknown extends GetExtensions<TExplicit>\n    ? [TSchema] extends [never]\n      ? TFallback\n      : InferSchemaOutput<TSchema>\n    : TExplicit\n\n/**\n * Configuration interface for Electric collection options\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 *\n * @remarks\n * Type resolution follows a priority order:\n * 1. If you provide an explicit type via generic parameter, it will be used\n * 2. If no explicit type is provided but a schema is, the schema's output type will be inferred\n * 3. If neither explicit type nor schema is provided, the fallback type will be used\n *\n * You should provide EITHER an explicit type OR a schema, but not both, as they would conflict.\n */\nexport interface ElectricCollectionConfig<\n  TExplicit extends Row<unknown> = Row<unknown>,\n  TSchema extends StandardSchemaV1 = never,\n  TFallback extends Row<unknown> = Row<unknown>,\n> {\n  /**\n   * Configuration options for the ElectricSQL ShapeStream\n   */\n  shapeOptions: ShapeStreamOptions<\n    GetExtensions<ResolveType<TExplicit, TSchema, TFallback>>\n  >\n\n  /**\n   * All standard Collection configuration properties\n   */\n  id?: string\n  schema?: TSchema\n  getKey: CollectionConfig<ResolveType<TExplicit, TSchema, TFallback>>[`getKey`]\n  sync?: CollectionConfig<ResolveType<TExplicit, TSchema, TFallback>>[`sync`]\n\n  /**\n   * Optional asynchronous handler function called before an insert operation\n   * Must return an object containing a txid number or array of txids\n   * @param params Object containing transaction and collection information\n   * @returns Promise resolving to an object with txid or txids\n   * @example\n   * // Basic Electric insert handler - MUST return { txid: number }\n   * onInsert: async ({ transaction }) => {\n   *   const newItem = transaction.mutations[0].modified\n   *   const result = await api.todos.create({\n   *     data: newItem\n   *   })\n   *   return { txid: result.txid } // Required for Electric sync matching\n   * }\n   *\n   * @example\n   * // Insert handler with multiple items - return array of txids\n   * onInsert: async ({ transaction }) => {\n   *   const items = transaction.mutations.map(m => m.modified)\n   *   const results = await Promise.all(\n   *     items.map(item => api.todos.create({ data: item }))\n   *   )\n   *   return { txid: results.map(r => r.txid) } // Array of txids\n   * }\n   *\n   * @example\n   * // Insert handler with error handling\n   * onInsert: async ({ transaction }) => {\n   *   try {\n   *     const newItem = transaction.mutations[0].modified\n   *     const result = await api.createTodo(newItem)\n   *     return { txid: result.txid }\n   *   } catch (error) {\n   *     console.error('Insert failed:', error)\n   *     throw error // This will cause the transaction to fail\n   *   }\n   * }\n   *\n   * @example\n   * // Insert handler with batch operation - single txid\n   * onInsert: async ({ transaction }) => {\n   *   const items = transaction.mutations.map(m => m.modified)\n   *   const result = await api.todos.createMany({\n   *     data: items\n   *   })\n   *   return { txid: result.txid } // Single txid for batch operation\n   * }\n   */\n  onInsert?: (\n    params: InsertMutationFnParams<ResolveType<TExplicit, TSchema, TFallback>>\n  ) => Promise<{ txid: Txid | Array<Txid> }>\n\n  /**\n   * Optional asynchronous handler function called before an update operation\n   * Must return an object containing a txid number or array of txids\n   * @param params Object containing transaction and collection information\n   * @returns Promise resolving to an object with txid or txids\n   * @example\n   * // Basic Electric update handler - MUST return { txid: number }\n   * onUpdate: async ({ transaction }) => {\n   *   const { original, changes } = transaction.mutations[0]\n   *   const result = await api.todos.update({\n   *     where: { id: original.id },\n   *     data: changes // Only the changed fields\n   *   })\n   *   return { txid: result.txid } // Required for Electric sync matching\n   * }\n   *\n   * @example\n   * // Update handler with multiple items - return array of txids\n   * onUpdate: async ({ transaction }) => {\n   *   const updates = await Promise.all(\n   *     transaction.mutations.map(m =>\n   *       api.todos.update({\n   *         where: { id: m.original.id },\n   *         data: m.changes\n   *       })\n   *     )\n   *   )\n   *   return { txid: updates.map(u => u.txid) } // Array of txids\n   * }\n   *\n   * @example\n   * // Update handler with optimistic rollback\n   * onUpdate: async ({ transaction }) => {\n   *   const mutation = transaction.mutations[0]\n   *   try {\n   *     const result = await api.updateTodo(mutation.original.id, mutation.changes)\n   *     return { txid: result.txid }\n   *   } catch (error) {\n   *     // Transaction will automatically rollback optimistic changes\n   *     console.error('Update failed, rolling back:', error)\n   *     throw error\n   *   }\n   * }\n   */\n  onUpdate?: (\n    params: UpdateMutationFnParams<ResolveType<TExplicit, TSchema, TFallback>>\n  ) => Promise<{ txid: Txid | Array<Txid> }>\n\n  /**\n   * Optional asynchronous handler function called before a delete operation\n   * Must return an object containing a txid number or array of txids\n   * @param params Object containing transaction and collection information\n   * @returns Promise resolving to an object with txid or txids\n   * @example\n   * // Basic Electric delete handler - MUST return { txid: number }\n   * onDelete: async ({ transaction }) => {\n   *   const mutation = transaction.mutations[0]\n   *   const result = await api.todos.delete({\n   *     id: mutation.original.id\n   *   })\n   *   return { txid: result.txid } // Required for Electric sync matching\n   * }\n   *\n   * @example\n   * // Delete handler with multiple items - return array of txids\n   * onDelete: async ({ transaction }) => {\n   *   const deletes = await Promise.all(\n   *     transaction.mutations.map(m =>\n   *       api.todos.delete({\n   *         where: { id: m.key }\n   *       })\n   *     )\n   *   )\n   *   return { txid: deletes.map(d => d.txid) } // Array of txids\n   * }\n   *\n   * @example\n   * // Delete handler with batch operation - single txid\n   * onDelete: async ({ transaction }) => {\n   *   const idsToDelete = transaction.mutations.map(m => m.original.id)\n   *   const result = await api.todos.deleteMany({\n   *     ids: idsToDelete\n   *   })\n   *   return { txid: result.txid } // Single txid for batch operation\n   * }\n   *\n   * @example\n   * // Delete handler with optimistic rollback\n   * onDelete: async ({ transaction }) => {\n   *   const mutation = transaction.mutations[0]\n   *   try {\n   *     const result = await api.deleteTodo(mutation.original.id)\n   *     return { txid: result.txid }\n   *   } catch (error) {\n   *     // Transaction will automatically rollback optimistic changes\n   *     console.error('Delete failed, rolling back:', error)\n   *     throw error\n   *   }\n   * }\n   *\n   */\n  onDelete?: (\n    params: DeleteMutationFnParams<ResolveType<TExplicit, TSchema, TFallback>>\n  ) => Promise<{ txid: Txid | Array<Txid> }>\n}\n\nfunction isUpToDateMessage<T extends Row<unknown>>(\n  message: Message<T>\n): message is ControlMessage & { up_to_date: true } {\n  return isControlMessage(message) && message.headers.control === `up-to-date`\n}\n\n// Check if a message contains txids in its headers\nfunction hasTxids<T extends Row<unknown>>(\n  message: Message<T>\n): message is Message<T> & { headers: { txids?: Array<Txid> } } {\n  return `txids` in message.headers && Array.isArray(message.headers.txids)\n}\n\n/**\n * Type for the awaitTxId utility function\n */\nexport type AwaitTxIdFn = (txId: Txid, timeout?: number) => Promise<boolean>\n\n/**\n * Electric collection utilities type\n */\nexport interface ElectricCollectionUtils extends UtilsRecord {\n  awaitTxId: AwaitTxIdFn\n}\n\n/**\n * Creates Electric collection options for use with a standard Collection\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 Electric collection\n * @returns Collection options with utilities\n */\nexport function electricCollectionOptions<\n  TExplicit extends Row<unknown> = Row<unknown>,\n  TSchema extends StandardSchemaV1 = never,\n  TFallback extends Row<unknown> = Row<unknown>,\n>(config: ElectricCollectionConfig<TExplicit, TSchema, TFallback>) {\n  const seenTxids = new Store<Set<Txid>>(new Set([]))\n  const sync = createElectricSync<ResolveType<TExplicit, TSchema, TFallback>>(\n    config.shapeOptions,\n    {\n      seenTxids,\n    }\n  )\n\n  /**\n   * Wait for a specific transaction ID to be synced\n   * @param txId The transaction ID to wait for as a number\n   * @param timeout Optional timeout in milliseconds (defaults to 30000ms)\n   * @returns Promise that resolves when the txId is synced\n   */\n  const awaitTxId: AwaitTxIdFn = async (\n    txId: Txid,\n    timeout: number = 30000\n  ): Promise<boolean> => {\n    debug(`awaitTxId called with txid %d`, txId)\n    if (typeof txId !== `number`) {\n      throw new TypeError(\n        `Expected number in awaitTxId, received ${typeof txId}`\n      )\n    }\n\n    const hasTxid = seenTxids.state.has(txId)\n    if (hasTxid) return true\n\n    return new Promise((resolve, reject) => {\n      const timeoutId = setTimeout(() => {\n        unsubscribe()\n        reject(new Error(`Timeout waiting for txId: ${txId}`))\n      }, timeout)\n\n      const unsubscribe = seenTxids.subscribe(() => {\n        if (seenTxids.state.has(txId)) {\n          debug(`awaitTxId found match for txid %o`, txId)\n          clearTimeout(timeoutId)\n          unsubscribe()\n          resolve(true)\n        }\n      })\n    })\n  }\n\n  // Create wrapper handlers for direct persistence operations that handle txid awaiting\n  const wrappedOnInsert = config.onInsert\n    ? async (\n        params: InsertMutationFnParams<\n          ResolveType<TExplicit, TSchema, TFallback>\n        >\n      ) => {\n        // Runtime check (that doesn't follow type)\n        // eslint-disable-next-line\n        const handlerResult = (await config.onInsert!(params)) ?? {}\n        const txid = (handlerResult as { txid?: Txid | Array<Txid> }).txid\n\n        if (!txid) {\n          throw new Error(\n            `Electric collection onInsert handler must return a txid or array of txids`\n          )\n        }\n\n        // Handle both single txid and array of txids\n        if (Array.isArray(txid)) {\n          await Promise.all(txid.map((id) => awaitTxId(id)))\n        } else {\n          await awaitTxId(txid)\n        }\n\n        return handlerResult\n      }\n    : undefined\n\n  const wrappedOnUpdate = config.onUpdate\n    ? async (\n        params: UpdateMutationFnParams<\n          ResolveType<TExplicit, TSchema, TFallback>\n        >\n      ) => {\n        // Runtime check (that doesn't follow type)\n        // eslint-disable-next-line\n        const handlerResult = (await config.onUpdate!(params)) ?? {}\n        const txid = (handlerResult as { txid?: Txid | Array<Txid> }).txid\n\n        if (!txid) {\n          throw new Error(\n            `Electric collection onUpdate handler must return a txid or array of txids`\n          )\n        }\n\n        // Handle both single txid and array of txids\n        if (Array.isArray(txid)) {\n          await Promise.all(txid.map((id) => awaitTxId(id)))\n        } else {\n          await awaitTxId(txid)\n        }\n\n        return handlerResult\n      }\n    : undefined\n\n  const wrappedOnDelete = config.onDelete\n    ? async (\n        params: DeleteMutationFnParams<\n          ResolveType<TExplicit, TSchema, TFallback>\n        >\n      ) => {\n        const handlerResult = await config.onDelete!(params)\n        if (!handlerResult.txid) {\n          throw new Error(\n            `Electric collection onDelete handler must return a txid or array of txids`\n          )\n        }\n\n        // Handle both single txid and array of txids\n        if (Array.isArray(handlerResult.txid)) {\n          await Promise.all(handlerResult.txid.map((id) => awaitTxId(id)))\n        } else {\n          await awaitTxId(handlerResult.txid)\n        }\n\n        return handlerResult\n      }\n    : undefined\n\n  // Extract standard Collection config properties\n  const {\n    shapeOptions: _shapeOptions,\n    onInsert: _onInsert,\n    onUpdate: _onUpdate,\n    onDelete: _onDelete,\n    ...restConfig\n  } = config\n\n  return {\n    ...restConfig,\n    sync,\n    onInsert: wrappedOnInsert,\n    onUpdate: wrappedOnUpdate,\n    onDelete: wrappedOnDelete,\n    utils: {\n      awaitTxId,\n    },\n  }\n}\n\n/**\n * Internal function to create ElectricSQL sync configuration\n */\nfunction createElectricSync<T extends Row<unknown>>(\n  shapeOptions: ShapeStreamOptions<GetExtensions<T>>,\n  options: {\n    seenTxids: Store<Set<Txid>>\n  }\n): SyncConfig<T> {\n  const { seenTxids } = options\n\n  // Store for the relation schema information\n  const relationSchema = new Store<string | undefined>(undefined)\n\n  /**\n   * Get the sync metadata for insert operations\n   * @returns Record containing relation information\n   */\n  const getSyncMetadata = (): Record<string, unknown> => {\n    // Use the stored schema if available, otherwise default to 'public'\n    const schema = relationSchema.state || `public`\n\n    return {\n      relation: shapeOptions.params?.table\n        ? [schema, shapeOptions.params.table]\n        : undefined,\n    }\n  }\n\n  // Abort controller for the stream - wraps the signal if provided\n  const abortController = new AbortController()\n  if (shapeOptions.signal) {\n    shapeOptions.signal.addEventListener(`abort`, () => {\n      abortController.abort()\n    })\n    if (shapeOptions.signal.aborted) {\n      abortController.abort()\n    }\n  }\n\n  let unsubscribeStream: () => void\n\n  return {\n    sync: (params: Parameters<SyncConfig<T>[`sync`]>[0]) => {\n      const { begin, write, commit } = params\n      const stream = new ShapeStream({\n        ...shapeOptions,\n        signal: abortController.signal,\n      })\n      let transactionStarted = false\n      const newTxids = new Set<Txid>()\n\n      unsubscribeStream = stream.subscribe((messages: Array<Message<T>>) => {\n        let hasUpToDate = false\n\n        for (const message of messages) {\n          // Check for txids in the message and add them to our store\n          if (hasTxids(message)) {\n            message.headers.txids?.forEach((txid) => newTxids.add(txid))\n          }\n\n          if (isChangeMessage(message)) {\n            // Check if the message contains schema information\n            const schema = message.headers.schema\n            if (schema && typeof schema === `string`) {\n              // Store the schema for future use if it's a valid string\n              relationSchema.setState(() => schema)\n            }\n\n            if (!transactionStarted) {\n              begin()\n              transactionStarted = true\n            }\n\n            write({\n              type: message.headers.operation,\n              value: message.value,\n              // Include the primary key and relation info in the metadata\n              metadata: {\n                ...message.headers,\n              },\n            })\n          } else if (isUpToDateMessage(message)) {\n            hasUpToDate = true\n          }\n        }\n\n        if (hasUpToDate) {\n          // Commit transaction if one was started\n          if (transactionStarted) {\n            commit()\n            transactionStarted = false\n          } else {\n            // If the shape is empty, do an empty commit to move the collection status\n            // to ready.\n            begin()\n            commit()\n          }\n\n          // Always commit txids when we receive up-to-date, regardless of transaction state\n          seenTxids.setState((currentTxids) => {\n            const clonedSeen = new Set<Txid>(currentTxids)\n            if (newTxids.size > 0) {\n              debug(`new txids synced from pg %O`, Array.from(newTxids))\n            }\n            newTxids.forEach((txid) => clonedSeen.add(txid))\n            newTxids.clear()\n            return clonedSeen\n          })\n        }\n      })\n\n      // Return the unsubscribe function\n      return () => {\n        // Unsubscribe from the stream\n        unsubscribeStream()\n        // Abort the abort controller to stop the stream\n        abortController.abort()\n      }\n    },\n    // Expose the getSyncMetadata function\n    getSyncMetadata,\n  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