@langchain/langgraph-sdk/dist/ui/transport.cjs.map

Client library for interacting with the LangGraph API

{"version":3,"file":"transport.cjs","names":["BytesLineDecoder","SSEDecoder","IterableReadableStream"],"sources":["../../src/ui/transport.ts"],"sourcesContent":["import type { BagTemplate } from \"../types.template.js\";\nimport type { Command } from \"../types.js\";\nimport type {\n  GetUpdateType,\n  GetConfigurableType,\n  UseStreamTransport,\n} from \"./types.js\";\nimport { BytesLineDecoder, SSEDecoder } from \"../utils/sse.js\";\nimport { IterableReadableStream } from \"../utils/stream.js\";\n\ninterface FetchStreamTransportOptions {\n  /**\n   * The URL of the API to use.\n   */\n  apiUrl: string;\n\n  /**\n   * Default headers to send with requests.\n   */\n  defaultHeaders?: HeadersInit;\n\n  /**\n   * Specify a custom fetch implementation.\n   */\n  // eslint-disable-next-line @typescript-eslint/no-explicit-any\n  fetch?: typeof fetch | ((...args: any[]) => any);\n\n  /**\n   * Callback that is called before the request is made.\n   */\n  onRequest?: (\n    url: string,\n    init: RequestInit\n  ) => Promise<RequestInit> | RequestInit;\n}\n\nexport class FetchStreamTransport<\n  StateType extends Record<string, unknown> = Record<string, unknown>,\n  Bag extends BagTemplate = BagTemplate,\n> implements UseStreamTransport<StateType, Bag> {\n  constructor(private readonly options: FetchStreamTransportOptions) {}\n\n  async stream(payload: {\n    input: GetUpdateType<Bag, StateType> | null | undefined;\n    context: GetConfigurableType<Bag> | undefined;\n    command: Command | undefined;\n    signal: AbortSignal;\n  }): Promise<AsyncGenerator<{ id?: string; event: string; data: unknown }>> {\n    const { signal, ...body } = payload;\n\n    let requestInit: RequestInit = {\n      method: \"POST\",\n      headers: {\n        \"Content-Type\": \"application/json\",\n        ...this.options.defaultHeaders,\n      },\n      body: JSON.stringify(body),\n      signal,\n    };\n\n    if (this.options.onRequest) {\n      requestInit = await this.options.onRequest(\n        this.options.apiUrl,\n        requestInit\n      );\n    }\n    const fetchFn = this.options.fetch ?? fetch;\n\n    const response = await fetchFn(this.options.apiUrl, requestInit);\n    if (!response.ok) {\n      throw new Error(`Failed to stream: ${response.statusText}`);\n    }\n\n    if (!response.body) {\n      throw new Error(\"Expected response body from stream endpoint\");\n    }\n\n    const stream = response.body\n      .pipeThrough(BytesLineDecoder())\n      .pipeThrough(SSEDecoder());\n\n    return IterableReadableStream.fromReadableStream(stream);\n  }\n}\n"],"mappings":";;;AAoCA,IAAa,uBAAb,MAGgD;CAC9C,YAAY,SAAuD;AAAtC,OAAA,UAAA;;CAE7B,MAAM,OAAO,SAK8D;EACzE,MAAM,EAAE,QAAQ,GAAG,SAAS;EAE5B,IAAI,cAA2B;GAC7B,QAAQ;GACR,SAAS;IACP,gBAAgB;IAChB,GAAG,KAAK,QAAQ;IACjB;GACD,MAAM,KAAK,UAAU,KAAK;GAC1B;GACD;AAED,MAAI,KAAK,QAAQ,UACf,eAAc,MAAM,KAAK,QAAQ,UAC/B,KAAK,QAAQ,QACb,YACD;EAIH,MAAM,WAAW,OAFD,KAAK,QAAQ,SAAS,OAEP,KAAK,QAAQ,QAAQ,YAAY;AAChE,MAAI,CAAC,SAAS,GACZ,OAAM,IAAI,MAAM,qBAAqB,SAAS,aAAa;AAG7D,MAAI,CAAC,SAAS,KACZ,OAAM,IAAI,MAAM,8CAA8C;EAGhE,MAAM,SAAS,SAAS,KACrB,YAAYA,YAAAA,kBAAkB,CAAC,CAC/B,YAAYC,YAAAA,YAAY,CAAC;AAE5B,SAAOC,eAAAA,uBAAuB,mBAAmB,OAAO"}