@langchain/langgraph/dist/pregel/messages-v2.cjs.map

LangGraph

{"version":3,"file":"messages-v2.cjs","names":["BaseCallbackHandler","ToolMessage","BaseMessage","BaseMessageChunk"],"sources":["../../src/pregel/messages-v2.ts"],"sourcesContent":["import { BaseCallbackHandler } from \"@langchain/core/callbacks/base\";\nimport {\n  BaseMessage,\n  ToolMessage,\n  BaseMessageChunk,\n} from \"@langchain/core/messages\";\nimport { Serialized } from \"@langchain/core/load/serializable\";\nimport { ChatGeneration, LLMResult } from \"@langchain/core/outputs\";\nimport type { ChatModelStreamEvent } from \"@langchain/core/language_models/event\";\nimport { ChainValues } from \"@langchain/core/utils/types\";\n\nimport { TAG_HIDDEN, TAG_NOSTREAM } from \"../constants.js\";\nimport { StreamChunk } from \"./stream.js\";\n\ntype Meta = [string[], Record<string, unknown>];\ntype CompatibleContentBlock = { type: string; [key: string]: unknown };\n\nfunction getResponseMetadata(\n  message: BaseMessage\n): Record<string, unknown> | undefined {\n  if (\n    \"response_metadata\" in message &&\n    typeof message.response_metadata === \"object\" &&\n    message.response_metadata != null\n  ) {\n    return message.response_metadata as Record<string, unknown>;\n  }\n  return undefined;\n}\n\nfunction getUsageMetadata(\n  message: BaseMessage\n): Record<string, unknown> | undefined {\n  if (\n    \"usage_metadata\" in message &&\n    typeof message.usage_metadata === \"object\" &&\n    message.usage_metadata != null\n  ) {\n    return message.usage_metadata as Record<string, unknown>;\n  }\n  return undefined;\n}\n\nfunction startBlockFor(block: CompatibleContentBlock): CompatibleContentBlock {\n  switch (block.type) {\n    case \"text\":\n      return { type: \"text\", text: \"\" };\n    case \"reasoning\":\n      return { type: \"reasoning\", reasoning: \"\" };\n    case \"tool_call\":\n    case \"tool_call_chunk\":\n      return {\n        type: \"tool_call_chunk\",\n        ...(block.id != null ? { id: block.id } : {}),\n        ...(block.name != null ? { name: block.name } : {}),\n        args: \"\",\n      };\n    default:\n      return block;\n  }\n}\n\nfunction deltaFor(\n  block: CompatibleContentBlock\n): ChatModelStreamEvent | undefined {\n  switch (block.type) {\n    case \"text\": {\n      const text = typeof block.text === \"string\" ? block.text : \"\";\n      return text.length > 0\n        ? {\n            event: \"content-block-delta\",\n            index: typeof block.index === \"number\" ? block.index : 0,\n            delta: { type: \"text-delta\", text },\n          }\n        : undefined;\n    }\n    case \"reasoning\": {\n      const reasoning =\n        typeof block.reasoning === \"string\" ? block.reasoning : \"\";\n      return reasoning.length > 0\n        ? {\n            event: \"content-block-delta\",\n            index: typeof block.index === \"number\" ? block.index : 0,\n            delta: { type: \"reasoning-delta\", reasoning },\n          }\n        : undefined;\n    }\n    case \"tool_call_chunk\":\n      return {\n        event: \"content-block-delta\",\n        index: typeof block.index === \"number\" ? block.index : 0,\n        delta: {\n          type: \"block-delta\",\n          fields: { ...block, type: \"tool_call_chunk\" },\n        },\n      };\n    default:\n      return undefined;\n  }\n}\n\n/**\n * A callback handler that implements protocol-native stream_mode=messages.\n *\n * LangChain Core owns chat model content-block event construction. This handler\n * only captures LangGraph metadata, forwards Core events to the Pregel messages\n * channel, and emits a small non-streaming fallback for models that cannot\n * produce stream events.\n */\nexport class StreamProtocolMessagesHandler extends BaseCallbackHandler {\n  name = \"StreamProtocolMessagesHandler\";\n\n  streamFn: (streamChunk: StreamChunk) => void;\n\n  metadatas: Record<string, Meta | undefined> = {};\n\n  seen: Record<string, BaseMessage | true> = {};\n\n  streamedRunIds = new Set<string>();\n\n  stableMessageIdMap: Record<string, string> = {};\n\n  lc_prefer_chat_model_stream_events = true;\n\n  // Dispatch this handler's callbacks inline rather than on LangChain's\n  // background callback queue. The handler's only side effect is a synchronous\n  // `push()` onto the run's stream, so running it inline guarantees those\n  // pushes happen *during* the model/chain call — while the stream is still\n  // open — instead of after the Pregel loop has returned and sealed the\n  // stream. Background dispatch let a model/tool call in a nested or parallel\n  // task flush its `messages` chunk after close, where `push()` silently drops\n  // it; this surfaced as empty per-message streams (`sub.messages`) for\n  // subagents dispatched in parallel from a single tools step.\n  awaitHandlers = true;\n\n  constructor(streamFn: (streamChunk: StreamChunk) => void) {\n    super();\n    this.streamFn = streamFn;\n  }\n\n  private normalizeMessageId(message: BaseMessage, runId: string | undefined) {\n    let messageId = message.id;\n\n    if (runId != null) {\n      if (ToolMessage.isInstance(message)) {\n        messageId ??= `run-${runId}-tool-${message.tool_call_id}`;\n      } else {\n        if (messageId == null || messageId === `run-${runId}`) {\n          messageId =\n            this.stableMessageIdMap[runId] ?? messageId ?? `run-${runId}`;\n        }\n        this.stableMessageIdMap[runId] ??= messageId;\n      }\n    }\n\n    if (messageId !== message.id) {\n      // eslint-disable-next-line no-param-reassign\n      message.id = messageId;\n      // eslint-disable-next-line no-param-reassign\n      message.lc_kwargs.id = messageId;\n    }\n\n    if (message.id != null) this.seen[message.id] = message;\n    return message.id;\n  }\n\n  private emit(meta: Meta, data: ChatModelStreamEvent, runId?: string) {\n    const metadata = runId != null ? { ...meta[1], run_id: runId } : meta[1];\n    this.streamFn([meta[0], \"messages\", [data, metadata]]);\n  }\n\n  private emitFinalMessage(\n    meta: Meta,\n    message: BaseMessage,\n    runId: string | undefined,\n    dedupe = false\n  ) {\n    const existingId =\n      message.id ??\n      (runId != null ? this.stableMessageIdMap[runId] : undefined);\n    if (dedupe && existingId != null && this.seen[existingId] !== undefined) {\n      return;\n    }\n\n    const messageId = this.normalizeMessageId(message, runId);\n    const role =\n      message.type === \"human\"\n        ? \"human\"\n        : message.type === \"system\"\n          ? \"system\"\n          : message.type === \"tool\"\n            ? \"tool\"\n            : \"ai\";\n    const toolCallId =\n      role === \"tool\" && ToolMessage.isInstance(message)\n        ? message.tool_call_id\n        : undefined;\n\n    this.emit(\n      meta,\n      {\n        event: \"message-start\",\n        ...(messageId != null ? { id: messageId } : {}),\n        ...(role !== \"ai\" ? ({ role } as Record<string, unknown>) : {}),\n        ...(typeof toolCallId === \"string\"\n          ? ({ tool_call_id: toolCallId } as Record<string, unknown>)\n          : {}),\n      } as ChatModelStreamEvent,\n      runId\n    );\n\n    const contentBlocks: CompatibleContentBlock[] = Array.isArray(\n      message.content\n    )\n      ? (message.content as CompatibleContentBlock[])\n      : typeof message.content === \"string\" && message.content.length > 0\n        ? [{ type: \"text\", text: message.content }]\n        : [];\n\n    contentBlocks.forEach((block, offset) => {\n      const index = typeof block.index === \"number\" ? block.index : offset;\n      this.emit(\n        meta,\n        {\n          event: \"content-block-start\",\n          index,\n          content: startBlockFor(block),\n        },\n        runId\n      );\n      const delta = deltaFor({ ...block, index });\n      if (delta != null) {\n        this.emit(meta, delta, runId);\n      }\n      this.emit(\n        meta,\n        {\n          event: \"content-block-finish\",\n          index,\n          content: block,\n        },\n        runId\n      );\n    });\n\n    this.emit(\n      meta,\n      {\n        event: \"message-finish\",\n        ...(getUsageMetadata(message) != null\n          ? { usage: getUsageMetadata(message) }\n          : {}),\n        ...(getResponseMetadata(message) != null\n          ? { responseMetadata: getResponseMetadata(message) }\n          : {}),\n      },\n      runId\n    );\n  }\n\n  handleChatModelStart(\n    _llm: Serialized,\n    _messages: BaseMessage[][],\n    runId: string,\n    _parentRunId?: string,\n    _extraParams?: Record<string, unknown>,\n    tags?: string[],\n    metadata?: Record<string, unknown>,\n    name?: string\n  ) {\n    if (\n      metadata &&\n      (!tags || (!tags.includes(TAG_NOSTREAM) && !tags.includes(\"nostream\")))\n    ) {\n      this.metadatas[runId] = [\n        (metadata.langgraph_checkpoint_ns as string).split(\"|\"),\n        { tags, name, ...metadata },\n      ];\n    }\n  }\n\n  handleLLMNewToken() {\n    // Core v2 stream events are forwarded via handleChatModelStreamEvent.\n  }\n\n  handleChatModelStreamEvent(event: ChatModelStreamEvent, runId: string) {\n    const meta = this.metadatas[runId];\n    if (meta === undefined) return;\n\n    let forwarded = event;\n    if (event.event === \"message-start\") {\n      this.streamedRunIds.add(runId);\n      const id = event.id ?? `run-${runId}`;\n      this.seen[id] = true;\n      this.stableMessageIdMap[runId] ??= id;\n      if (event.id == null) {\n        forwarded = { ...event, id };\n      }\n    }\n\n    this.emit(meta, forwarded, runId);\n  }\n\n  handleLLMEnd(output: LLMResult, runId: string) {\n    const meta = this.metadatas[runId];\n    if (meta === undefined) return;\n\n    const chatGeneration = output.generations?.[0]?.[0] as ChatGeneration;\n    const message = BaseMessage.isInstance(chatGeneration?.message)\n      ? chatGeneration.message\n      : undefined;\n\n    if (message != null) {\n      if (this.streamedRunIds.has(runId)) {\n        const messageId = this.normalizeMessageId(message, runId);\n        if (messageId != null) this.seen[messageId] = message;\n      } else {\n        this.emitFinalMessage(meta, message, runId, true);\n      }\n    }\n\n    this.streamedRunIds.delete(runId);\n    delete this.metadatas[runId];\n    delete this.stableMessageIdMap[runId];\n  }\n\n  // eslint-disable-next-line @typescript-eslint/no-explicit-any\n  handleLLMError(_err: any, runId: string) {\n    this.streamedRunIds.delete(runId);\n    delete this.metadatas[runId];\n    delete this.stableMessageIdMap[runId];\n  }\n\n  handleChainStart(\n    _chain: Serialized,\n    inputs: ChainValues,\n    runId: string,\n    _parentRunId?: string,\n    tags?: string[],\n    metadata?: Record<string, unknown>,\n    _runType?: string,\n    name?: string\n  ) {\n    if (\n      metadata !== undefined &&\n      name === metadata.langgraph_node &&\n      (tags === undefined || !tags.includes(TAG_HIDDEN))\n    ) {\n      this.metadatas[runId] = [\n        (metadata.langgraph_checkpoint_ns as string).split(\"|\"),\n        { tags, name, ...metadata },\n      ];\n\n      if (typeof inputs === \"object\") {\n        for (const value of Object.values(inputs)) {\n          if (\n            (BaseMessage.isInstance(value) ||\n              BaseMessageChunk.isInstance(value)) &&\n            value.id !== undefined\n          ) {\n            this.seen[value.id] = value;\n          } else if (Array.isArray(value)) {\n            for (const item of value) {\n              if (\n                (BaseMessage.isInstance(item) ||\n                  BaseMessageChunk.isInstance(item)) &&\n                item.id !== undefined\n              ) {\n                this.seen[item.id] = item;\n              }\n            }\n          }\n        }\n      }\n    }\n  }\n\n  handleChainEnd(outputs: ChainValues, runId: string) {\n    const meta = this.metadatas[runId];\n    delete this.metadatas[runId];\n    if (meta === undefined) return;\n\n    const emitMessage = (value: unknown) => {\n      if (BaseMessage.isInstance(value) && !ToolMessage.isInstance(value)) {\n        this.emitFinalMessage(meta, value, runId, true);\n      }\n    };\n\n    if (BaseMessage.isInstance(outputs)) {\n      emitMessage(outputs);\n    } else if (Array.isArray(outputs)) {\n      for (const value of outputs) emitMessage(value);\n    } else if (outputs != null && typeof outputs === \"object\") {\n      for (const value of Object.values(outputs)) {\n        if (Array.isArray(value)) {\n          for (const item of value) emitMessage(item);\n        } else {\n          emitMessage(value);\n        }\n      }\n    }\n\n    delete this.stableMessageIdMap[runId];\n  }\n\n  // eslint-disable-next-line @typescript-eslint/no-explicit-any\n  handleChainError(_err: any, runId: string) {\n    delete this.metadatas[runId];\n    delete this.stableMessageIdMap[runId];\n  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