@langchain/openai/dist/converters/completions.cjs.map

OpenAI integrations for LangChain.js

{"version":3,"file":"completions.cjs","names":["completionsApiContentBlockConverter: StandardContentBlockConverter<{\n  text: ChatCompletionContentPartText;\n  image: ChatCompletionContentPartImage;\n  audio: ChatCompletionContentPartInputAudio;\n  file: ChatCompletionContentPart.File;\n}>","mimeType: { type: string; subtype: string }","getRequiredFilenameFromMetadata","convertCompletionsMessageToBaseMessage: Converter<\n  {\n    message: OpenAIClient.Chat.Completions.ChatCompletionMessage;\n    rawResponse: OpenAIClient.Chat.Completions.ChatCompletion;\n    includeRawResponse?: boolean;\n  },\n  BaseMessage\n>","rawToolCalls: OpenAIToolCall[] | undefined","e: any","additional_kwargs: Record<string, unknown>","response_metadata: Record<string, unknown> | undefined","handleMultiModalOutput","AIMessage","ChatMessage","convertCompletionsDeltaToBaseMessageChunk: Converter<\n  {\n    // eslint-disable-next-line @typescript-eslint/no-explicit-any\n    delta: Record<string, any>;\n    rawResponse: OpenAIClient.Chat.Completions.ChatCompletionChunk;\n    includeRawResponse?: boolean;\n    defaultRole?: OpenAIClient.Chat.ChatCompletionRole;\n  },\n  BaseMessageChunk\n>","HumanMessageChunk","toolCallChunks: ToolCallChunk[]","AIMessageChunk","SystemMessageChunk","FunctionMessageChunk","ToolMessageChunk","ChatMessageChunk","convertStandardContentBlockToCompletionsContentPart: Converter<\n  ContentBlock.Standard,\n  | OpenAIClient.Chat.Completions.ChatCompletionContentPartImage\n  | OpenAIClient.Chat.Completions.ChatCompletionContentPartInputAudio\n  | OpenAIClient.Chat.Completions.ChatCompletionContentPart.File\n  | undefined\n>","format","convertStandardContentMessageToCompletionsMessage: Converter<\n  { message: BaseMessage; model?: string },\n  OpenAIClient.Chat.Completions.ChatCompletionMessageParam\n>","messageToOpenAIRole","isReasoningModel","ToolMessage","blocks: ContentBlock.Standard[]","convertMessagesToCompletionsMessageParams: Converter<\n  { messages: BaseMessage[]; model?: string },\n  OpenAIClient.Chat.Completions.ChatCompletionMessageParam[]\n>","completionParam: Record<string, any>","convertLangChainToolCallToOpenAI"],"sources":["../../src/converters/completions.ts"],"sourcesContent":["import {\n  AIMessage,\n  AIMessageChunk,\n  BaseMessage,\n  BaseMessageChunk,\n  ChatMessage,\n  ChatMessageChunk,\n  FunctionMessageChunk,\n  HumanMessageChunk,\n  OpenAIToolCall,\n  SystemMessageChunk,\n  ToolCallChunk,\n  ToolMessage,\n  ToolMessageChunk,\n  parseBase64DataUrl,\n  parseMimeType,\n  StandardContentBlockConverter,\n  isDataContentBlock,\n  ContentBlock,\n  iife,\n  convertToProviderContentBlock,\n} from \"@langchain/core/messages\";\nimport {\n  convertLangChainToolCallToOpenAI,\n  makeInvalidToolCall,\n  parseToolCall,\n} from \"@langchain/core/output_parsers/openai_tools\";\nimport { Converter } from \"@langchain/core/utils/format\";\nimport type {\n  ChatCompletionContentPartText,\n  ChatCompletionContentPartImage,\n  ChatCompletionContentPartInputAudio,\n  ChatCompletionContentPart,\n} from \"openai/resources/chat/completions\";\nimport { OpenAI as OpenAIClient } from \"openai\";\nimport { handleMultiModalOutput } from \"../utils/output.js\";\nimport {\n  getRequiredFilenameFromMetadata,\n  isReasoningModel,\n  messageToOpenAIRole,\n} from \"../utils/misc.js\";\n\n/**\n * @deprecated This converter is an internal detail of the OpenAI provider. Do not use it directly. This will be revisited in a future release.\n */\nexport const completionsApiContentBlockConverter: StandardContentBlockConverter<{\n  text: ChatCompletionContentPartText;\n  image: ChatCompletionContentPartImage;\n  audio: ChatCompletionContentPartInputAudio;\n  file: ChatCompletionContentPart.File;\n}> = {\n  providerName: \"ChatOpenAI\",\n\n  fromStandardTextBlock(block): ChatCompletionContentPartText {\n    return { type: \"text\", text: block.text };\n  },\n\n  fromStandardImageBlock(block): ChatCompletionContentPartImage {\n    if (block.source_type === \"url\") {\n      return {\n        type: \"image_url\",\n        image_url: {\n          url: block.url,\n          ...(block.metadata?.detail\n            ? { detail: block.metadata.detail as \"auto\" | \"low\" | \"high\" }\n            : {}),\n        },\n      };\n    }\n\n    if (block.source_type === \"base64\") {\n      const url = `data:${block.mime_type ?? \"\"};base64,${block.data}`;\n      return {\n        type: \"image_url\",\n        image_url: {\n          url,\n          ...(block.metadata?.detail\n            ? { detail: block.metadata.detail as \"auto\" | \"low\" | \"high\" }\n            : {}),\n        },\n      };\n    }\n\n    throw new Error(\n      `Image content blocks with source_type ${block.source_type} are not supported for ChatOpenAI`\n    );\n  },\n\n  fromStandardAudioBlock(block): ChatCompletionContentPartInputAudio {\n    if (block.source_type === \"url\") {\n      const data = parseBase64DataUrl({ dataUrl: block.url });\n      if (!data) {\n        throw new Error(\n          `URL audio blocks with source_type ${block.source_type} must be formatted as a data URL for ChatOpenAI`\n        );\n      }\n\n      const rawMimeType = data.mime_type || block.mime_type || \"\";\n      let mimeType: { type: string; subtype: string };\n\n      try {\n        mimeType = parseMimeType(rawMimeType);\n      } catch {\n        throw new Error(\n          `Audio blocks with source_type ${block.source_type} must have mime type of audio/wav or audio/mp3`\n        );\n      }\n\n      if (\n        mimeType.type !== \"audio\" ||\n        (mimeType.subtype !== \"wav\" && mimeType.subtype !== \"mp3\")\n      ) {\n        throw new Error(\n          `Audio blocks with source_type ${block.source_type} must have mime type of audio/wav or audio/mp3`\n        );\n      }\n\n      return {\n        type: \"input_audio\",\n        input_audio: {\n          format: mimeType.subtype,\n          data: data.data,\n        },\n      };\n    }\n\n    if (block.source_type === \"base64\") {\n      let mimeType: { type: string; subtype: string };\n\n      try {\n        mimeType = parseMimeType(block.mime_type ?? \"\");\n      } catch {\n        throw new Error(\n          `Audio blocks with source_type ${block.source_type} must have mime type of audio/wav or audio/mp3`\n        );\n      }\n\n      if (\n        mimeType.type !== \"audio\" ||\n        (mimeType.subtype !== \"wav\" && mimeType.subtype !== \"mp3\")\n      ) {\n        throw new Error(\n          `Audio blocks with source_type ${block.source_type} must have mime type of audio/wav or audio/mp3`\n        );\n      }\n\n      return {\n        type: \"input_audio\",\n        input_audio: {\n          format: mimeType.subtype,\n          data: block.data,\n        },\n      };\n    }\n\n    throw new Error(\n      `Audio content blocks with source_type ${block.source_type} are not supported for ChatOpenAI`\n    );\n  },\n\n  fromStandardFileBlock(block): ChatCompletionContentPart.File {\n    if (block.source_type === \"url\") {\n      const data = parseBase64DataUrl({ dataUrl: block.url });\n\n      const filename = getRequiredFilenameFromMetadata(block);\n\n      if (!data) {\n        throw new Error(\n          `URL file blocks with source_type ${block.source_type} must be formatted as a data URL for ChatOpenAI`\n        );\n      }\n\n      return {\n        type: \"file\",\n        file: {\n          file_data: block.url, // formatted as base64 data URL\n          ...(block.metadata?.filename || block.metadata?.name\n            ? {\n                filename,\n              }\n            : {}),\n        },\n      };\n    }\n\n    if (block.source_type === \"base64\") {\n      const filename = getRequiredFilenameFromMetadata(block);\n\n      return {\n        type: \"file\",\n        file: {\n          file_data: `data:${block.mime_type ?? \"\"};base64,${block.data}`,\n          ...(block.metadata?.filename ||\n          block.metadata?.name ||\n          block.metadata?.title\n            ? {\n                filename,\n              }\n            : {}),\n        },\n      };\n    }\n\n    if (block.source_type === \"id\") {\n      return {\n        type: \"file\",\n        file: {\n          file_id: block.id,\n        },\n      };\n    }\n\n    throw new Error(\n      `File content blocks with source_type ${block.source_type} are not supported for ChatOpenAI`\n    );\n  },\n};\n\n/**\n * Converts an OpenAI Chat Completions API message to a LangChain BaseMessage.\n *\n * This converter transforms messages from OpenAI's Chat Completions API format into\n * LangChain's internal message representation, handling various message types and\n * preserving metadata, tool calls, and other relevant information.\n *\n * @remarks\n * The converter handles the following message roles:\n * - `assistant`: Converted to {@link AIMessage} with support for tool calls, function calls,\n *   audio content, and multi-modal outputs\n * - Other roles: Converted to generic {@link ChatMessage}\n *\n * For assistant messages, the converter:\n * - Parses and validates tool calls, separating valid and invalid calls\n * - Preserves function call information in additional_kwargs\n * - Includes usage statistics and system fingerprint in response_metadata\n * - Handles multi-modal content (text, images, audio)\n * - Optionally includes the raw API response for debugging\n *\n * @param params - Conversion parameters\n * @param params.message - The OpenAI chat completion message to convert\n * @param params.rawResponse - The complete raw response from OpenAI's API, used to extract\n *   metadata like model name, usage statistics, and system fingerprint\n * @param params.includeRawResponse - If true, includes the raw OpenAI response in the\n *   message's additional_kwargs under the `__raw_response` key. Useful for debugging\n *   or accessing provider-specific fields. Defaults to false.\n *\n * @returns A LangChain BaseMessage instance:\n *   - {@link AIMessage} for assistant messages with tool calls, metadata, and content\n *   - {@link ChatMessage} for all other message types\n *\n * @example\n * ```typescript\n * const baseMessage = convertCompletionsMessageToBaseMessage({\n *   message: {\n *     role: \"assistant\",\n *     content: \"Hello! How can I help you?\",\n *     tool_calls: [\n *       {\n *         id: \"call_123\",\n *         type: \"function\",\n *         function: { name: \"get_weather\", arguments: '{\"location\":\"NYC\"}' }\n *       }\n *     ]\n *   },\n *   rawResponse: completionResponse,\n *   includeRawResponse: true\n * });\n * // Returns an AIMessage with parsed tool calls and metadata\n * ```\n *\n * @throws {Error} If tool call parsing fails, the invalid tool call is captured in\n *   the `invalid_tool_calls` array rather than throwing an error\n *\n */\nexport const convertCompletionsMessageToBaseMessage: Converter<\n  {\n    message: OpenAIClient.Chat.Completions.ChatCompletionMessage;\n    rawResponse: OpenAIClient.Chat.Completions.ChatCompletion;\n    includeRawResponse?: boolean;\n  },\n  BaseMessage\n> = ({ message, rawResponse, includeRawResponse }) => {\n  const rawToolCalls: OpenAIToolCall[] | undefined = message.tool_calls as\n    | OpenAIToolCall[]\n    | undefined;\n  switch (message.role) {\n    case \"assistant\": {\n      const toolCalls = [];\n      const invalidToolCalls = [];\n      for (const rawToolCall of rawToolCalls ?? []) {\n        try {\n          toolCalls.push(parseToolCall(rawToolCall, { returnId: true }));\n          // eslint-disable-next-line @typescript-eslint/no-explicit-any\n        } catch (e: any) {\n          invalidToolCalls.push(makeInvalidToolCall(rawToolCall, e.message));\n        }\n      }\n      const additional_kwargs: Record<string, unknown> = {\n        function_call: message.function_call,\n        tool_calls: rawToolCalls,\n      };\n      if (includeRawResponse !== undefined) {\n        additional_kwargs.__raw_response = rawResponse;\n      }\n      const response_metadata: Record<string, unknown> | undefined = {\n        model_provider: \"openai\",\n        model_name: rawResponse.model,\n        ...(rawResponse.system_fingerprint\n          ? {\n              usage: { ...rawResponse.usage },\n              system_fingerprint: rawResponse.system_fingerprint,\n            }\n          : {}),\n      };\n\n      if (message.audio) {\n        additional_kwargs.audio = message.audio;\n      }\n\n      const content = handleMultiModalOutput(\n        message.content || \"\",\n        rawResponse.choices?.[0]?.message\n      );\n      return new AIMessage({\n        content,\n        tool_calls: toolCalls,\n        invalid_tool_calls: invalidToolCalls,\n        additional_kwargs,\n        response_metadata,\n        id: rawResponse.id,\n      });\n    }\n    default:\n      return new ChatMessage(message.content || \"\", message.role ?? \"unknown\");\n  }\n};\n\n/**\n * Converts an OpenAI Chat Completions API delta (streaming chunk) to a LangChain BaseMessageChunk.\n *\n * This converter is used during streaming responses to transform incremental updates from OpenAI's\n * Chat Completions API into LangChain message chunks. It handles various message types, tool calls,\n * function calls, audio content, and role-specific message chunk creation.\n *\n * @param params - Conversion parameters\n * @param params.delta - The delta object from an OpenAI streaming chunk containing incremental\n *   message updates. May include content, role, tool_calls, function_call, audio, etc.\n * @param params.rawResponse - The complete raw ChatCompletionChunk response from OpenAI,\n *   containing metadata like model info, usage stats, and the delta\n * @param params.includeRawResponse - Optional flag to include the raw OpenAI response in the\n *   message chunk's additional_kwargs. Useful for debugging or accessing provider-specific data\n * @param params.defaultRole - Optional default role to use if the delta doesn't specify one.\n *   Typically used to maintain role consistency across chunks in a streaming response\n *\n * @returns A BaseMessageChunk subclass appropriate for the message role:\n *   - HumanMessageChunk for \"user\" role\n *   - AIMessageChunk for \"assistant\" role (includes tool call chunks)\n *   - SystemMessageChunk for \"system\" or \"developer\" roles\n *   - FunctionMessageChunk for \"function\" role\n *   - ToolMessageChunk for \"tool\" role\n *   - ChatMessageChunk for any other role\n *\n * @example\n * Basic streaming text chunk:\n * ```typescript\n * const chunk = convertCompletionsDeltaToBaseMessageChunk({\n *   delta: { role: \"assistant\", content: \"Hello\" },\n *   rawResponse: { id: \"chatcmpl-123\", model: \"gpt-4\", ... }\n * });\n * // Returns: AIMessageChunk with content \"Hello\"\n * ```\n *\n * @example\n * Streaming chunk with tool call:\n * ```typescript\n * const chunk = convertCompletionsDeltaToBaseMessageChunk({\n *   delta: {\n *     role: \"assistant\",\n *     tool_calls: [{\n *       index: 0,\n *       id: \"call_123\",\n *       function: { name: \"get_weather\", arguments: '{\"location\":' }\n *     }]\n *   },\n *   rawResponse: { id: \"chatcmpl-123\", ... }\n * });\n * // Returns: AIMessageChunk with tool_call_chunks containing partial tool call data\n * ```\n *\n * @remarks\n * - Tool calls are converted to ToolCallChunk objects with incremental data\n * - Audio content includes the chunk index from the raw response\n * - The \"developer\" role is mapped to SystemMessageChunk with a special marker\n * - Response metadata includes model provider info and usage statistics\n * - Function calls and tool calls are stored in additional_kwargs for compatibility\n */\nexport const convertCompletionsDeltaToBaseMessageChunk: Converter<\n  {\n    // eslint-disable-next-line @typescript-eslint/no-explicit-any\n    delta: Record<string, any>;\n    rawResponse: OpenAIClient.Chat.Completions.ChatCompletionChunk;\n    includeRawResponse?: boolean;\n    defaultRole?: OpenAIClient.Chat.ChatCompletionRole;\n  },\n  BaseMessageChunk\n> = ({ delta, rawResponse, includeRawResponse, defaultRole }) => {\n  const role = delta.role ?? defaultRole;\n  const content = delta.content ?? \"\";\n  let additional_kwargs: Record<string, unknown>;\n  if (delta.function_call) {\n    additional_kwargs = {\n      function_call: delta.function_call,\n    };\n  } else if (delta.tool_calls) {\n    additional_kwargs = {\n      tool_calls: delta.tool_calls,\n    };\n  } else {\n    additional_kwargs = {};\n  }\n  if (includeRawResponse) {\n    additional_kwargs.__raw_response = rawResponse;\n  }\n\n  if (delta.audio) {\n    additional_kwargs.audio = {\n      ...delta.audio,\n      index: rawResponse.choices[0].index,\n    };\n  }\n\n  const response_metadata = {\n    model_provider: \"openai\",\n    usage: { ...rawResponse.usage },\n  };\n  if (role === \"user\") {\n    return new HumanMessageChunk({ content, response_metadata });\n  } else if (role === \"assistant\") {\n    const toolCallChunks: ToolCallChunk[] = [];\n    if (Array.isArray(delta.tool_calls)) {\n      for (const rawToolCall of delta.tool_calls) {\n        toolCallChunks.push({\n          name: rawToolCall.function?.name,\n          args: rawToolCall.function?.arguments,\n          id: rawToolCall.id,\n          index: rawToolCall.index,\n          type: \"tool_call_chunk\",\n        });\n      }\n    }\n    return new AIMessageChunk({\n      content,\n      tool_call_chunks: toolCallChunks,\n      additional_kwargs,\n      id: rawResponse.id,\n      response_metadata,\n    });\n  } else if (role === \"system\") {\n    return new SystemMessageChunk({ content, response_metadata });\n  } else if (role === \"developer\") {\n    return new SystemMessageChunk({\n      content,\n      response_metadata,\n      additional_kwargs: {\n        __openai_role__: \"developer\",\n      },\n    });\n  } else if (role === \"function\") {\n    return new FunctionMessageChunk({\n      content,\n      additional_kwargs,\n      name: delta.name,\n      response_metadata,\n    });\n  } else if (role === \"tool\") {\n    return new ToolMessageChunk({\n      content,\n      additional_kwargs,\n      tool_call_id: delta.tool_call_id,\n      response_metadata,\n    });\n  } else {\n    return new ChatMessageChunk({ content, role, response_metadata });\n  }\n};\n\n/**\n * Converts a standard LangChain content block to an OpenAI Completions API content part.\n *\n * This converter transforms LangChain's standardized content blocks (image, audio, file)\n * into the format expected by OpenAI's Chat Completions API. It handles various content\n * types including images (URL or base64), audio (base64), and files (data or file ID).\n *\n * @param block - The standard content block to convert. Can be an image, audio, or file block.\n *\n * @returns An OpenAI Chat Completions content part object, or undefined if the block\n *   cannot be converted (e.g., missing required data).\n *\n * @example\n * Image with URL:\n * ```typescript\n * const block = { type: \"image\", url: \"https://example.com/image.jpg\" };\n * const part = convertStandardContentBlockToCompletionsContentPart(block);\n * // Returns: { type: \"image_url\", image_url: { url: \"https://example.com/image.jpg\" } }\n * ```\n *\n * @example\n * Image with base64 data:\n * ```typescript\n * const block = { type: \"image\", data: \"iVBORw0KGgo...\", mimeType: \"image/png\" };\n * const part = convertStandardContentBlockToCompletionsContentPart(block);\n * // Returns: { type: \"image_url\", image_url: { url: \"data:image/png;base64,iVBORw0KGgo...\" } }\n * ```\n */\nexport const convertStandardContentBlockToCompletionsContentPart: Converter<\n  ContentBlock.Standard,\n  | OpenAIClient.Chat.Completions.ChatCompletionContentPartImage\n  | OpenAIClient.Chat.Completions.ChatCompletionContentPartInputAudio\n  | OpenAIClient.Chat.Completions.ChatCompletionContentPart.File\n  | undefined\n> = (block) => {\n  if (block.type === \"image\") {\n    if (block.url) {\n      return {\n        type: \"image_url\",\n        image_url: {\n          url: block.url,\n        },\n      };\n    } else if (block.data) {\n      return {\n        type: \"image_url\",\n        image_url: {\n          url: `data:${block.mimeType};base64,${block.data}`,\n        },\n      };\n    }\n  }\n  if (block.type === \"audio\") {\n    if (block.data) {\n      const format = iife(() => {\n        const [, format] = block.mimeType.split(\"/\");\n        if (format === \"wav\" || format === \"mp3\") {\n          return format;\n        }\n        return \"wav\";\n      });\n      return {\n        type: \"input_audio\",\n        input_audio: {\n          data: block.data.toString(),\n          format,\n        },\n      };\n    }\n  }\n  if (block.type === \"file\") {\n    if (block.data) {\n      const filename = getRequiredFilenameFromMetadata(block);\n\n      return {\n        type: \"file\",\n        file: {\n          file_data: `data:${block.mimeType};base64,${block.data}`,\n          filename: filename,\n        },\n      };\n    }\n    if (block.fileId) {\n      return {\n        type: \"file\",\n        file: {\n          file_id: block.fileId,\n        },\n      };\n    }\n  }\n  return undefined;\n};\n\n/**\n * Converts a LangChain BaseMessage with standard content blocks to an OpenAI Chat Completions API message parameter.\n *\n * This converter transforms LangChain's standardized message format (using contentBlocks) into the format\n * expected by OpenAI's Chat Completions API. It handles role mapping, content filtering, and multi-modal\n * content conversion for various message types.\n *\n * @remarks\n * The converter performs the following transformations:\n * - Maps LangChain message roles to OpenAI API roles (user, assistant, system, developer, tool, function)\n * - For reasoning models, automatically converts \"system\" role to \"developer\" role\n * - Filters content blocks based on message role (most roles only include text blocks)\n * - For user messages, converts multi-modal content blocks (images, audio, files) to OpenAI format\n * - Preserves tool call IDs for tool messages and function names for function messages\n *\n * Role-specific behavior:\n * - **developer**: Returns only text content blocks (used for reasoning models)\n * - **system**: Returns only text content blocks\n * - **assistant**: Returns only text content blocks\n * - **tool**: Returns only text content blocks with tool_call_id preserved\n * - **function**: Returns text content blocks joined as a single string with function name\n * - **user** (default): Returns multi-modal content including text, images, audio, and files\n *\n * @param params - Conversion parameters\n * @param params.message - The LangChain BaseMessage to convert. Must have contentBlocks property\n *   containing an array of standard content blocks (text, image, audio, file, etc.)\n * @param params.model - Optional model name. Used to determine if special role mapping is needed\n *   (e.g., \"system\" -> \"developer\" for reasoning models like o1)\n *\n * @returns An OpenAI ChatCompletionMessageParam object formatted for the Chat Completions API.\n *   The structure varies by role:\n *   - Developer/System/Assistant: `{ role, content: TextBlock[] }`\n *   - Tool: `{ role: \"tool\", tool_call_id, content: TextBlock[] }`\n *   - Function: `{ role: \"function\", name, content: string }`\n *   - User: `{ role: \"user\", content: Array<TextPart | ImagePart | AudioPart | FilePart> }`\n *\n * @example\n * Simple text message:\n * ```typescript\n * const message = new HumanMessage({\n *   content: [{ type: \"text\", text: \"Hello!\" }]\n * });\n * const param = convertStandardContentMessageToCompletionsMessage({ message });\n * // Returns: { role: \"user\", content: [{ type: \"text\", text: \"Hello!\" }] }\n * ```\n *\n * @example\n * Multi-modal user message with image:\n * ```typescript\n * const message = new HumanMessage({\n *   content: [\n *     { type: \"text\", text: \"What's in this image?\" },\n *     { type: \"image\", url: \"https://example.com/image.jpg\" }\n *   ]\n * });\n * const param = convertStandardContentMessageToCompletionsMessage({ message });\n * // Returns: {\n * //   role: \"user\",\n * //   content: [\n * //     { type: \"text\", text: \"What's in this image?\" },\n * //     { type: \"image_url\", image_url: { url: \"https://example.com/image.jpg\" } }\n * //   ]\n * // }\n * ```\n */\nexport const convertStandardContentMessageToCompletionsMessage: Converter<\n  { message: BaseMessage; model?: string },\n  OpenAIClient.Chat.Completions.ChatCompletionMessageParam\n> = ({ message, model }) => {\n  let role = messageToOpenAIRole(message);\n  if (role === \"system\" && isReasoningModel(model)) {\n    role = \"developer\";\n  }\n  if (role === \"developer\") {\n    return {\n      role: \"developer\",\n      content: message.contentBlocks.filter((block) => block.type === \"text\"),\n    };\n  } else if (role === \"system\") {\n    return {\n      role: \"system\",\n      content: message.contentBlocks.filter((block) => block.type === \"text\"),\n    };\n  } else if (role === \"assistant\") {\n    return {\n      role: \"assistant\",\n      content: message.contentBlocks.filter((block) => block.type === \"text\"),\n    };\n  } else if (role === \"tool\" && ToolMessage.isInstance(message)) {\n    return {\n      role: \"tool\",\n      tool_call_id: message.tool_call_id,\n      content: message.contentBlocks.filter((block) => block.type === \"text\"),\n    };\n  } else if (role === \"function\") {\n    return {\n      role: \"function\",\n      name: message.name ?? \"\",\n      content: message.contentBlocks\n        .filter((block) => block.type === \"text\")\n        .join(\"\"),\n    };\n  }\n  // Default to user message handling\n  function* iterateUserContent(blocks: ContentBlock.Standard[]) {\n    for (const block of blocks) {\n      if (block.type === \"text\") {\n        yield {\n          type: \"text\" as const,\n          text: block.text,\n        };\n      }\n      const data = convertStandardContentBlockToCompletionsContentPart(block);\n      if (data) {\n        yield data;\n      }\n    }\n  }\n  return {\n    role: \"user\",\n    content: Array.from(iterateUserContent(message.contentBlocks)),\n  };\n};\n\n/**\n * Converts an array of LangChain BaseMessages to OpenAI Chat Completions API message parameters.\n *\n * This converter transforms LangChain's internal message representation into the format required\n * by OpenAI's Chat Completions API. It handles various message types, roles, content formats,\n * tool calls, function calls, audio messages, and special model-specific requirements.\n *\n * @remarks\n * The converter performs several key transformations:\n * - Maps LangChain message types to OpenAI roles (user, assistant, system, tool, function, developer)\n * - Converts standard content blocks (v1 format) using a specialized converter\n * - Handles multimodal content including text, images, audio, and data blocks\n * - Preserves tool calls and function calls with proper formatting\n * - Applies model-specific role mappings (e.g., \"system\" → \"developer\" for reasoning models)\n * - Splits audio messages into separate message parameters when needed\n *\n * @param params - Conversion parameters\n * @param params.messages - Array of LangChain BaseMessages to convert. Can include any message\n *   type: HumanMessage, AIMessage, SystemMessage, ToolMessage, FunctionMessage, etc.\n * @param params.model - Optional model name used to determine if special role mapping is needed.\n *   For reasoning models (o1, o3, etc.), \"system\" role is converted to \"developer\" role.\n *\n * @returns Array of ChatCompletionMessageParam objects formatted for OpenAI's Chat Completions API.\n *   Some messages may be split into multiple parameters (e.g., audio messages).\n *\n * @example\n * Basic message conversion:\n * ```typescript\n * const messages = [\n *   new HumanMessage(\"What's the weather like?\"),\n *   new AIMessage(\"Let me check that for you.\")\n * ];\n *\n * const params = convertMessagesToCompletionsMessageParams({\n *   messages,\n *   model: \"gpt-4\"\n * });\n * // Returns:\n * // [\n * //   { role: \"user\", content: \"What's the weather like?\" },\n * //   { role: \"assistant\", content: \"Let me check that for you.\" }\n * // ]\n * ```\n *\n * @example\n * Message with tool calls:\n * ```typescript\n * const messages = [\n *   new AIMessage({\n *     content: \"\",\n *     tool_calls: [{\n *       id: \"call_123\",\n *       name: \"get_weather\",\n *       args: { location: \"San Francisco\" }\n *     }]\n *   })\n * ];\n *\n * const params = convertMessagesToCompletionsMessageParams({ messages });\n * // Returns:\n * // [{\n * //   role: \"assistant\",\n * //   content: \"\",\n * //   tool_calls: [{\n * //     id: \"call_123\",\n * //     type: \"function\",\n * //     function: { name: \"get_weather\", arguments: '{\"location\":\"San Francisco\"}' }\n * //   }]\n * // }]\n * ```\n */\nexport const convertMessagesToCompletionsMessageParams: Converter<\n  { messages: BaseMessage[]; model?: string },\n  OpenAIClient.Chat.Completions.ChatCompletionMessageParam[]\n> = ({ messages, model }) => {\n  return messages.flatMap((message) => {\n    if (\n      \"output_version\" in message.response_metadata &&\n      message.response_metadata?.output_version === \"v1\"\n    ) {\n      return convertStandardContentMessageToCompletionsMessage({ message });\n    }\n    let role = messageToOpenAIRole(message);\n    if (role === \"system\" && isReasoningModel(model)) {\n      role = \"developer\";\n    }\n\n    const content =\n      typeof message.content === \"string\"\n        ? message.content\n        : message.content.map((m) => {\n            if (isDataContentBlock(m)) {\n              return convertToProviderContentBlock(\n                m,\n                completionsApiContentBlockConverter\n              );\n            }\n            return m;\n          });\n    // eslint-disable-next-line @typescript-eslint/no-explicit-any\n    const completionParam: Record<string, any> = {\n      role,\n      content,\n    };\n    if (message.name != null) {\n      completionParam.name = message.name;\n    }\n    if (message.additional_kwargs.function_call != null) {\n      completionParam.function_call = message.additional_kwargs.function_call;\n    }\n    if (AIMessage.isInstance(message) && !!message.tool_calls?.length) {\n      completionParam.tool_calls = message.tool_calls.map(\n        convertLangChainToolCallToOpenAI\n      );\n    } else {\n      if (message.additional_kwargs.tool_calls != null) {\n        completionParam.tool_calls = message.additional_kwargs.tool_calls;\n      }\n      if (ToolMessage.isInstance(message) && message.tool_call_id != null) {\n        completionParam.tool_call_id = message.tool_call_id;\n      }\n    }\n\n    if (\n      message.additional_kwargs.audio &&\n      typeof message.additional_kwargs.audio === \"object\" &&\n      \"id\" in message.additional_kwargs.audio\n    ) {\n      const audioMessage = {\n        role: \"assistant\",\n        audio: {\n          id: message.additional_kwargs.audio.id,\n        },\n      };\n      return [\n        completionParam,\n        audioMessage,\n      ] as OpenAIClient.Chat.Completions.ChatCompletionMessageParam[];\n    }\n\n    return completionParam as OpenAIClient.Chat.Completions.ChatCompletionMessageParam;\n  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