@langchain/core/dist/language_models/compat.cjs.map

Core LangChain.js abstractions and schemas

{"version":3,"file":"compat.cjs","names":["AIMessageChunk"],"sources":["../../src/language_models/compat.ts"],"sourcesContent":["/**\n * Compatibility bridge: converts legacy `_streamResponseChunks`\n * (`ChatGenerationChunk` / `AIMessageChunk`) output to the new\n * `ChatModelStreamEvent` protocol.\n *\n * @module\n */\n\nimport { AIMessageChunk } from \"../messages/ai.js\";\nimport type { ContentBlock } from \"../messages/content/index.js\";\nimport type { ChatGenerationChunk } from \"../outputs.js\";\nimport type { ChatModelStreamEvent, ContentBlockDelta } from \"./event.js\";\n\nconst MIME_TYPE_BY_AUDIO_FORMAT: Record<string, string> = {\n  wav: \"audio/wav\",\n  mp3: \"audio/mpeg\",\n  flac: \"audio/flac\",\n  opus: \"audio/opus\",\n  aac: \"audio/aac\",\n  pcm16: \"audio/pcm\",\n};\n\nconst MIME_TYPE_BY_IMAGE_FORMAT: Record<string, string> = {\n  png: \"image/png\",\n  jpeg: \"image/jpeg\",\n  jpg: \"image/jpeg\",\n  webp: \"image/webp\",\n  gif: \"image/gif\",\n};\n\ntype AudioStreamState = {\n  index: number;\n  id?: string;\n  mimeType: string;\n  transcript: string;\n};\n\nfunction nextBlockIndex(activeBlocks: Map<number, unknown>): number {\n  let next = 0;\n  for (const index of activeBlocks.keys()) {\n    if (index >= next) next = index + 1;\n  }\n  return next;\n}\n\nfunction getAdditionalKwargs(message: unknown): Record<string, unknown> {\n  const additional = (message as { additional_kwargs?: unknown })\n    .additional_kwargs;\n  return additional != null && typeof additional === \"object\"\n    ? (additional as Record<string, unknown>)\n    : {};\n}\n\nfunction extractImageBlocksFromToolOutputs(message: unknown): ContentBlock[] {\n  const toolOutputs = getAdditionalKwargs(message).tool_outputs;\n  if (!Array.isArray(toolOutputs)) return [];\n\n  const blocks: ContentBlock[] = [];\n  for (const entry of toolOutputs) {\n    if (entry == null || typeof entry !== \"object\") continue;\n    const record = entry as Record<string, unknown>;\n    if (record.type !== \"image_generation_call\") continue;\n\n    const data = typeof record.result === \"string\" ? record.result : undefined;\n    const url = typeof record.url === \"string\" ? record.url : undefined;\n    if (data == null && url == null) continue;\n\n    const outputFormat =\n      typeof record.output_format === \"string\"\n        ? record.output_format.toLowerCase()\n        : undefined;\n    const mimeType =\n      (outputFormat != null\n        ? MIME_TYPE_BY_IMAGE_FORMAT[outputFormat]\n        : undefined) ?? \"image/png\";\n\n    blocks.push({\n      type: \"image\",\n      ...(typeof record.id === \"string\" ? { id: record.id } : {}),\n      ...(url != null ? { url } : {}),\n      ...(data != null ? { data } : {}),\n      mimeType,\n    } as ContentBlock);\n  }\n  return blocks;\n}\n\n/**\n * Get the audio payload from the message.\n *\n * This handles the OpenAI-shaped `additional_kwargs.audio` payload used by\n * legacy chunk streams; other providers must normalize into this shape first.\n *\n * @param message - The message to get the audio payload from.\n * @returns The audio payload.\n * @internal\n */\nfunction getAudioPayload(message: unknown):\n  | {\n      id?: string;\n      data?: string;\n      url?: string;\n      transcript?: string;\n      mimeType: string;\n    }\n  | undefined {\n  const audio = getAdditionalKwargs(message).audio;\n  if (audio == null || typeof audio !== \"object\") return undefined;\n  const record = audio as Record<string, unknown>;\n\n  const data = typeof record.data === \"string\" ? record.data : undefined;\n  const url = typeof record.url === \"string\" ? record.url : undefined;\n  const transcript =\n    typeof record.transcript === \"string\" ? record.transcript : undefined;\n  if (data == null && url == null && transcript == null) return undefined;\n\n  const explicitMimeType =\n    typeof record.mime_type === \"string\"\n      ? record.mime_type\n      : typeof record.mimeType === \"string\"\n        ? record.mimeType\n        : undefined;\n  const format =\n    typeof record.format === \"string\" ? record.format.toLowerCase() : undefined;\n  const mimeType =\n    explicitMimeType ??\n    (format != null ? MIME_TYPE_BY_AUDIO_FORMAT[format] : undefined) ??\n    (data != null ? \"audio/wav\" : \"audio/pcm\");\n\n  return {\n    ...(typeof record.id === \"string\" ? { id: record.id } : {}),\n    ...(data != null ? { data } : {}),\n    ...(url != null ? { url } : {}),\n    ...(transcript != null ? { transcript } : {}),\n    mimeType,\n  };\n}\n\n/**\n * Convert an async iterable of legacy `ChatGenerationChunk`s into\n * `ChatModelStreamEvent`s with typed deltas.\n */\nexport async function* convertChunksToEvents(\n  chunks: AsyncIterable<ChatGenerationChunk>,\n  options?: { signal?: AbortSignal }\n): AsyncGenerator<ChatModelStreamEvent> {\n  const activeBlocks = new Map<\n    number,\n    { type: string; accumulated: ContentBlock }\n  >();\n  let messageStarted = false;\n  let lastUsage:\n    | { input_tokens: number; output_tokens: number; total_tokens: number }\n    | undefined;\n  let audioStream: AudioStreamState | undefined;\n  const emittedImageKeys = new Set<string>();\n\n  for await (const chunk of chunks) {\n    options?.signal?.throwIfAborted();\n\n    const msg = chunk.message;\n\n    // Message start\n    let usageHandledInStart = false;\n    if (!messageStarted) {\n      messageStarted = true;\n      const startEvent: ChatModelStreamEvent = {\n        event: \"message-start\" as const,\n        id: msg.id ?? undefined,\n      };\n      if (AIMessageChunk.isInstance(msg) && msg.usage_metadata) {\n        (startEvent as { usage?: unknown }).usage = msg.usage_metadata;\n        lastUsage = { ...msg.usage_metadata };\n        usageHandledInStart = true;\n      }\n      yield startEvent;\n    }\n\n    // Process content\n    const content = msg.content;\n    if (typeof content === \"string\") {\n      if (content !== \"\") {\n        const blockIndex = 0;\n        if (!activeBlocks.has(blockIndex)) {\n          const initial: ContentBlock.Text = { type: \"text\", text: \"\" };\n          activeBlocks.set(blockIndex, {\n            type: \"text\",\n            accumulated: initial,\n          });\n          yield {\n            event: \"content-block-start\" as const,\n            index: blockIndex,\n            content: initial,\n          };\n        }\n        const block = activeBlocks.get(blockIndex)!;\n        block.accumulated = {\n          ...block.accumulated,\n          text: ((block.accumulated as { text?: string }).text ?? \"\") + content,\n        };\n        yield {\n          event: \"content-block-delta\" as const,\n          index: blockIndex,\n          delta: { type: \"text-delta\" as const, text: content },\n        };\n      }\n    } else if (Array.isArray(content)) {\n      for (const part of content) {\n        const blockIndex =\n          typeof part.index === \"number\" ? part.index : activeBlocks.size;\n\n        if (!activeBlocks.has(blockIndex)) {\n          activeBlocks.set(blockIndex, {\n            type: part.type,\n            accumulated: { ...part },\n          });\n          yield {\n            event: \"content-block-start\" as const,\n            index: blockIndex,\n            content: { ...part },\n          };\n        } else {\n          const block = activeBlocks.get(blockIndex)!;\n          const delta = contentBlockToDelta(part);\n          block.accumulated = applyDeltaToBlock(block.accumulated, delta);\n          yield {\n            event: \"content-block-delta\" as const,\n            index: blockIndex,\n            delta,\n          };\n        }\n      }\n    }\n\n    // Tool call chunks\n    if (\n      AIMessageChunk.isInstance(msg) &&\n      msg.tool_call_chunks &&\n      msg.tool_call_chunks.length > 0\n    ) {\n      for (const toolChunk of msg.tool_call_chunks) {\n        const blockIndex =\n          typeof toolChunk.index === \"number\"\n            ? toolChunk.index\n            : activeBlocks.size;\n\n        if (!activeBlocks.has(blockIndex)) {\n          const initial: ContentBlock = {\n            type: \"tool_call_chunk\" as const,\n            id: toolChunk.id,\n            name: toolChunk.name,\n            args: \"\",\n            index: blockIndex,\n          };\n          activeBlocks.set(blockIndex, {\n            type: \"tool_call_chunk\",\n            accumulated: initial,\n          });\n          yield {\n            event: \"content-block-start\" as const,\n            index: blockIndex,\n            content: initial,\n          };\n        }\n\n        // Accumulate tool call args internally, emit incremental content chunks.\n        const block = activeBlocks.get(blockIndex)!;\n        const acc = block.accumulated as {\n          args?: string;\n          id?: string;\n          name?: string;\n        };\n        if (toolChunk.id != null) acc.id = toolChunk.id;\n        if (toolChunk.name != null) acc.name = toolChunk.name;\n        acc.args = (acc.args ?? \"\") + (toolChunk.args ?? \"\");\n        yield {\n          event: \"content-block-delta\" as const,\n          index: blockIndex,\n          delta: {\n            type: \"block-delta\" as const,\n            fields: {\n              type: \"tool_call_chunk\",\n              ...(\"id\" in acc && acc.id != null ? { id: acc.id } : {}),\n              ...(\"name\" in acc && acc.name != null ? { name: acc.name } : {}),\n              args: acc.args,\n            },\n          },\n        };\n      }\n    }\n\n    const audioPayload = getAudioPayload(msg);\n    if (audioPayload != null) {\n      if (audioStream == null) {\n        const index = nextBlockIndex(activeBlocks);\n        audioStream = {\n          index,\n          id: audioPayload.id,\n          mimeType: audioPayload.mimeType,\n          transcript: \"\",\n        };\n        const initial = {\n          type: \"audio\",\n          ...(audioPayload.id != null ? { id: audioPayload.id } : {}),\n          ...(audioPayload.url != null ? { url: audioPayload.url } : {}),\n          data: \"\",\n          mimeType: audioPayload.mimeType,\n        } as ContentBlock;\n        activeBlocks.set(index, {\n          type: \"audio\",\n          accumulated: initial,\n        });\n        yield {\n          event: \"content-block-start\" as const,\n          index,\n          content: initial,\n        };\n      }\n\n      const activeAudio = activeBlocks.get(audioStream.index);\n      if (activeAudio != null) {\n        const accumulated = activeAudio.accumulated as ContentBlock & {\n          data?: string;\n          transcript?: string;\n        };\n        if (audioPayload.id != null && audioStream.id == null) {\n          audioStream.id = audioPayload.id;\n          (accumulated as { id?: string }).id = audioPayload.id;\n        }\n        if (audioPayload.transcript != null) {\n          audioStream.transcript += audioPayload.transcript;\n          accumulated.transcript = audioStream.transcript;\n          yield {\n            event: \"content-block-delta\" as const,\n            index: audioStream.index,\n            delta: {\n              type: \"block-delta\" as const,\n              fields: {\n                type: \"audio\",\n                transcript: audioStream.transcript,\n              },\n            },\n          };\n        }\n        if (audioPayload.data != null && audioPayload.data.length > 0) {\n          accumulated.data = (accumulated.data ?? \"\") + audioPayload.data;\n          yield {\n            event: \"content-block-delta\" as const,\n            index: audioStream.index,\n            delta: {\n              type: \"data-delta\" as const,\n              data: audioPayload.data,\n              encoding: \"base64\" as const,\n            },\n          };\n        }\n      }\n    }\n\n    for (const imageBlock of extractImageBlocksFromToolOutputs(msg)) {\n      const imageRecord = imageBlock as ContentBlock & {\n        id?: string;\n        url?: string;\n        data?: string;\n      };\n      const imageKey =\n        imageRecord.id ??\n        imageRecord.url ??\n        (imageRecord.data != null\n          ? `${imageRecord.data.length}:${imageRecord.data.slice(0, 32)}`\n          : undefined);\n      if (imageKey != null && emittedImageKeys.has(imageKey)) continue;\n      if (imageKey != null) emittedImageKeys.add(imageKey);\n\n      const index = nextBlockIndex(activeBlocks);\n      activeBlocks.set(index, {\n        type: \"image\",\n        accumulated: imageBlock,\n      });\n      yield {\n        event: \"content-block-start\" as const,\n        index,\n        content: imageBlock,\n      };\n    }\n\n    // Usage\n    if (\n      !usageHandledInStart &&\n      AIMessageChunk.isInstance(msg) &&\n      msg.usage_metadata\n    ) {\n      const chunkUsage = msg.usage_metadata;\n      if (!lastUsage) {\n        lastUsage = { ...chunkUsage };\n      } else {\n        lastUsage = {\n          input_tokens: lastUsage.input_tokens + chunkUsage.input_tokens,\n          output_tokens: lastUsage.output_tokens + chunkUsage.output_tokens,\n          total_tokens: lastUsage.total_tokens + chunkUsage.total_tokens,\n        };\n      }\n      yield { event: \"usage\" as const, usage: { ...lastUsage } };\n    }\n  }\n\n  // Finish all blocks\n  for (const [index, block] of activeBlocks) {\n    const finalized = finalizeContentBlock(block.accumulated);\n    yield {\n      event: \"content-block-finish\" as const,\n      index,\n      content: finalized,\n    };\n  }\n\n  yield {\n    event: \"message-finish\" as const,\n    reason: \"stop\" as const,\n    ...(lastUsage ? { usage: lastUsage } : {}),\n  };\n}\n\n/**\n * Apply a typed delta to an accumulated content block.\n * @internal\n */\nfunction applyDeltaToBlock(\n  block: ContentBlock,\n  delta: ContentBlockDelta\n): ContentBlock {\n  switch (delta.type) {\n    case \"text-delta\":\n      if (block.type === \"text\") {\n        return {\n          ...block,\n          text: (block.text ?? \"\") + delta.text,\n        };\n      }\n      return block;\n    case \"reasoning-delta\":\n      if (block.type === \"thinking\") {\n        return {\n          ...block,\n          thinking: (block.thinking ?? \"\") + delta.reasoning,\n        };\n      }\n      if (block.type === \"reasoning\") {\n        return {\n          ...block,\n          reasoning: (block.reasoning ?? \"\") + delta.reasoning,\n        };\n      }\n      return block;\n    case \"data-delta\":\n      return {\n        ...block,\n        data: (block.data ?? \"\") + delta.data,\n      };\n    case \"block-delta\":\n      return { ...block, ...delta.fields } as ContentBlock;\n    default:\n      throw new Error(`Unknown delta type: ${JSON.stringify(delta)}`);\n  }\n}\n\nfunction contentBlockToDelta(block: ContentBlock): ContentBlockDelta {\n  if (block.type === \"text\") {\n    return { type: \"text-delta\", text: (block as ContentBlock.Text).text };\n  }\n  if (block.type === \"reasoning\") {\n    return {\n      type: \"reasoning-delta\",\n      reasoning: (block as ContentBlock.Reasoning).reasoning,\n    };\n  }\n  if (block.type === \"thinking\" && typeof block.thinking === \"string\") {\n    return {\n      type: \"reasoning-delta\",\n      reasoning: block.thinking,\n    };\n  }\n  if (typeof block.data === \"string\") {\n    return {\n      type: \"data-delta\",\n      data: block.data,\n      encoding: \"base64\",\n    };\n  }\n  if (typeof block.type === \"string\") {\n    return {\n      type: \"block-delta\",\n      fields: {\n        ...(block as unknown as { type: string } & Record<string, unknown>),\n      },\n    };\n  }\n\n  throw new Error(`Unsupported content block delta: ${JSON.stringify(block)}`);\n}\n\n/**\n * Finalize a content block for the finish event.\n * For tool calls, parse the accumulated JSON args string.\n */\nexport function finalizeContentBlock(block: ContentBlock): ContentBlock {\n  if (block.type === \"tool_call_chunk\") {\n    const chunk = block as ContentBlock.Tools.ToolCallChunk;\n    let parsedArgs: unknown;\n    try {\n      parsedArgs = JSON.parse(chunk.args ?? \"{}\");\n    } catch {\n      return {\n        type: \"invalid_tool_call\" as const,\n        id: chunk.id,\n        name: chunk.name,\n        args: chunk.args,\n        error: \"Failed to parse tool call arguments as JSON\",\n      } as ContentBlock.Tools.InvalidToolCall;\n    }\n    return {\n      type: \"tool_call\" as const,\n      id: chunk.id,\n      name: chunk.name!,\n      args: parsedArgs,\n    } as ContentBlock.Tools.ToolCall;\n  }\n\n  return 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