@langchain/community/dist/utils/bedrock/index.cjs.map

Third-party integrations for LangChain.js

{"version":3,"file":"index.cjs","names":["formatMessagesForAnthropic","_makeMessageChunkFromAnthropicEvent","extractToolCallChunk","extractToolUseContent","extractToken","ChatGenerationChunk","AIMessageChunk","extractToolCalls","AIMessage"],"sources":["../../../src/utils/bedrock/index.ts"],"sourcesContent":["import type { AwsCredentialIdentity, Provider } from \"@aws-sdk/types\";\nimport {\n  AIMessage,\n  AIMessageChunk,\n  BaseMessage,\n} from \"@langchain/core/messages\";\nimport { StructuredToolInterface } from \"@langchain/core/tools\";\nimport { ChatGeneration, ChatGenerationChunk } from \"@langchain/core/outputs\";\nimport {\n  _makeMessageChunkFromAnthropicEvent,\n  extractToken,\n  extractToolCallChunk,\n  extractToolUseContent,\n  extractToolCalls,\n  formatMessagesForAnthropic,\n} from \"./anthropic.js\";\n\nexport type CredentialType =\n  | AwsCredentialIdentity\n  | Provider<AwsCredentialIdentity>;\n\n/**\n * format messages for Cohere Command-R and CommandR+ via AWS Bedrock.\n *\n * @param messages messages The base messages to format as a prompt.\n *\n * @returns The formatted prompt for Cohere.\n *\n * `system`: user system prompts. Overrides the default preamble for search query generation. Has no effect on tool use generations.\\\n * `message`: (Required) Text input for the model to respond to.\\\n * `chatHistory`: A list of previous messages between the user and the model, meant to give the model conversational context for responding to the user's message.\\\n * The following are required fields.\n * - `role` - The role for the message. Valid values are USER or CHATBOT.\\\n * - `message` – Text contents of the message.\\\n *\n * The following is example JSON for the chat_history field.\\\n * \"chat_history\": [\n * {\"role\": \"USER\", \"message\": \"Who discovered gravity?\"},\n * {\"role\": \"CHATBOT\", \"message\": \"The man who is widely credited with discovering gravity is Sir Isaac Newton\"}]\\\n *\n * docs: https://docs.aws.amazon.com/bedrock/latest/userguide/model-parameters-cohere-command-r-plus.html\n */\nfunction formatMessagesForCohere(messages: BaseMessage[]): {\n  system?: string;\n  message: string;\n  chatHistory: Record<string, unknown>[];\n} {\n  const systemMessages = messages.filter(\n    (system) => system._getType() === \"system\"\n  );\n\n  const system = systemMessages\n    .filter((m) => typeof m.content === \"string\")\n    .map((m) => m.content)\n    .join(\"\\n\\n\");\n\n  const conversationMessages = messages.filter(\n    (message) => message._getType() !== \"system\"\n  );\n\n  const questionContent = conversationMessages.slice(-1);\n\n  if (!questionContent.length || questionContent[0]._getType() !== \"human\") {\n    throw new Error(\"question message content must be a human message.\");\n  }\n\n  if (typeof questionContent[0].content !== \"string\") {\n    throw new Error(\"question message content must be a string.\");\n  }\n\n  const formattedMessage = questionContent[0].content;\n\n  const formattedChatHistories = conversationMessages\n    .slice(0, -1)\n    .map((message) => {\n      let role;\n      switch (message._getType()) {\n        case \"human\":\n          role = \"USER\" as const;\n          break;\n        case \"ai\":\n          role = \"CHATBOT\" as const;\n          break;\n        case \"system\":\n          throw new Error(\"chat_history can not include system prompts.\");\n        default:\n          throw new Error(\n            `Message type \"${message._getType()}\" is not supported.`\n          );\n      }\n\n      if (typeof message.content !== \"string\") {\n        throw new Error(\"message content must be a string.\");\n      }\n      return {\n        role,\n        message: message.content,\n      };\n    });\n\n  return {\n    chatHistory: formattedChatHistories,\n    message: formattedMessage,\n    system,\n  };\n}\n\n/** Bedrock models.\n    To authenticate, the AWS client uses the following methods to automatically load credentials:\n    https://boto3.amazonaws.com/v1/documentation/api/latest/guide/credentials.html\n    If a specific credential profile should be used, you must pass the name of the profile from the ~/.aws/credentials file that is to be used.\n    Make sure the credentials / roles used have the required policies to access the Bedrock service.\n*/\nexport interface BaseBedrockInput {\n  /** Model to use.\n      For example, \"amazon.titan-tg1-large\", this is equivalent to the modelId property in the list-foundation-models api.\n  */\n  model: string;\n\n  /** Optional URL Encoded overide for URL model parameter in fetch. Necessary for invoking an Application Inference Profile.\n      For example, \"arn%3Aaws%3Abedrock%3Aus-east-1%3A1234567890%3Aapplication-inference-profile%2Fabcdefghi\", will override this.model in final /invoke URL call.\n      Must still provide `model` as normal modelId to benefit from all the metadata.\n  */\n  applicationInferenceProfile?: string;\n\n  /** The AWS region e.g. `us-west-2`.\n      Fallback to AWS_DEFAULT_REGION env variable or region specified in ~/.aws/config in case it is not provided here.\n  */\n  region?: string;\n\n  /** AWS Credentials.\n      If no credentials are provided, the default credentials from `@aws-sdk/credential-provider-node` will be used.\n   */\n  credentials?: CredentialType;\n\n  /** Temperature. */\n  temperature?: number;\n\n  /** Max tokens. */\n  maxTokens?: number;\n\n  /** A custom fetch function for low-level access to AWS API. Defaults to fetch(). */\n  fetchFn?: typeof fetch;\n\n  /** Override the default endpoint hostname. */\n  endpointHost?: string;\n\n  /** Additional kwargs to pass to the model. */\n  modelKwargs?: Record<string, unknown>;\n\n  /** Whether or not to stream responses */\n  streaming: boolean;\n\n  /** Trace settings for the Bedrock Guardrails. */\n  trace?: \"ENABLED\" | \"DISABLED\";\n\n  /** Identifier for the guardrail configuration. */\n  guardrailIdentifier?: string;\n\n  /** Version for the guardrail configuration. */\n  guardrailVersion?: string;\n\n  /** Required when Guardrail is in use. */\n  guardrailConfig?: {\n    tagSuffix: string;\n    streamProcessingMode: \"SYNCHRONOUS\" | \"ASYNCHRONOUS\";\n  };\n\n  awsAccessKeyId?: string;\n\n  awsSecretAccessKey?: string;\n\n  awsSessionToken?: string;\n}\n\ntype Dict = { [key: string]: unknown };\n\n/**\n * A helper class used within the `Bedrock` class. It is responsible for\n * preparing the input and output for the Bedrock service. It formats the\n * input prompt based on the provider (e.g., \"anthropic\", \"ai21\",\n * \"amazon\") and extracts the generated text from the service response.\n */\nexport class BedrockLLMInputOutputAdapter {\n  /** Adapter class to prepare the inputs from Langchain to a format\n  that LLM model expects. Also, provides a helper function to extract\n  the generated text from the model response. */\n\n  static prepareInput(\n    provider: string,\n    prompt: string,\n    maxTokens = 50,\n    temperature = 0,\n    stopSequences: string[] | undefined = undefined,\n    modelKwargs: Record<string, unknown> = {},\n    bedrockMethod: \"invoke\" | \"invoke-with-response-stream\" = \"invoke\",\n    guardrailConfig:\n      | {\n          tagSuffix: string;\n          streamProcessingMode: \"SYNCHRONOUS\" | \"ASYNCHRONOUS\";\n        }\n      | undefined = undefined\n  ): Dict {\n    const inputBody: Dict = {};\n\n    if (provider === \"anthropic\") {\n      inputBody.prompt = prompt;\n      inputBody.max_tokens_to_sample = maxTokens;\n      inputBody.temperature = temperature;\n      inputBody.stop_sequences = stopSequences;\n    } else if (provider === \"ai21\") {\n      inputBody.prompt = prompt;\n      inputBody.maxTokens = maxTokens;\n      inputBody.temperature = temperature;\n      inputBody.stopSequences = stopSequences;\n    } else if (provider === \"meta\") {\n      inputBody.prompt = prompt;\n      inputBody.max_gen_len = maxTokens;\n      inputBody.temperature = temperature;\n    } else if (provider === \"amazon\") {\n      inputBody.inputText = prompt;\n      inputBody.textGenerationConfig = {\n        maxTokenCount: maxTokens,\n        temperature,\n      };\n    } else if (provider === \"cohere\") {\n      inputBody.prompt = prompt;\n      inputBody.max_tokens = maxTokens;\n      inputBody.temperature = temperature;\n      inputBody.stop_sequences = stopSequences;\n      if (bedrockMethod === \"invoke-with-response-stream\") {\n        inputBody.stream = true;\n      }\n    } else if (provider === \"mistral\") {\n      inputBody.prompt = prompt;\n      inputBody.max_tokens = maxTokens;\n      inputBody.temperature = temperature;\n      inputBody.stop = stopSequences;\n    }\n\n    if (\n      guardrailConfig &&\n      guardrailConfig.tagSuffix &&\n      guardrailConfig.streamProcessingMode\n    ) {\n      inputBody[\"amazon-bedrock-guardrailConfig\"] = guardrailConfig;\n    }\n\n    return { ...inputBody, ...modelKwargs };\n  }\n\n  static prepareMessagesInput(\n    provider: string,\n    messages: BaseMessage[],\n    maxTokens = 1024,\n    temperature = 0,\n    stopSequences: string[] | undefined = undefined,\n    modelKwargs: Record<string, unknown> = {},\n    guardrailConfig:\n      | {\n          tagSuffix: string;\n          streamProcessingMode: \"SYNCHRONOUS\" | \"ASYNCHRONOUS\";\n        }\n      | undefined = undefined,\n    tools: (StructuredToolInterface | Record<string, unknown>)[] = []\n  ): Dict {\n    const inputBody: Dict = {};\n\n    if (provider === \"anthropic\") {\n      const { system, messages: formattedMessages } =\n        formatMessagesForAnthropic(messages);\n      if (system !== undefined) {\n        inputBody.system = system;\n      }\n      inputBody.anthropic_version = \"bedrock-2023-05-31\";\n      inputBody.messages = formattedMessages;\n      inputBody.max_tokens = maxTokens;\n      inputBody.temperature = temperature;\n      inputBody.stop_sequences = stopSequences;\n\n      if (tools.length > 0) {\n        inputBody.tools = tools;\n      }\n    } else if (provider === \"cohere\") {\n      const {\n        system,\n        message: formattedMessage,\n        chatHistory: formattedChatHistories,\n      } = formatMessagesForCohere(messages);\n\n      if (system !== undefined && system.length > 0) {\n        inputBody.preamble = system;\n      }\n      inputBody.message = formattedMessage;\n      inputBody.chat_history = formattedChatHistories;\n      inputBody.max_tokens = maxTokens;\n      inputBody.temperature = temperature;\n      inputBody.stop_sequences = stopSequences;\n    } else {\n      throw new Error(\n        \"The messages API is currently only supported by Anthropic or Cohere\"\n      );\n    }\n\n    if (\n      guardrailConfig &&\n      guardrailConfig.tagSuffix &&\n      guardrailConfig.streamProcessingMode\n    ) {\n      inputBody[\"amazon-bedrock-guardrailConfig\"] = guardrailConfig;\n    }\n\n    return { ...inputBody, ...modelKwargs };\n  }\n\n  /**\n   * Extracts the generated text from the service response.\n   * @param provider The provider name.\n   * @param responseBody The response body from the service.\n   * @returns The generated text.\n   */\n  // oxlint-disable-next-line typescript/no-explicit-any\n  static prepareOutput(provider: string, responseBody: any): string {\n    if (provider === \"anthropic\") {\n      return responseBody.completion;\n    } else if (provider === \"ai21\") {\n      return responseBody?.completions?.[0]?.data?.text ?? \"\";\n    } else if (provider === \"cohere\") {\n      return responseBody?.generations?.[0]?.text ?? responseBody?.text ?? \"\";\n    } else if (provider === \"meta\") {\n      return responseBody.generation;\n    } else if (provider === \"mistral\") {\n      return responseBody?.outputs?.[0]?.text;\n    }\n\n    // I haven't been able to get a response with more than one result in it.\n    return responseBody.results?.[0]?.outputText;\n  }\n\n  static prepareMessagesOutput(\n    provider: string,\n    // oxlint-disable-next-line typescript/no-explicit-any\n    response: any,\n    fields?: {\n      coerceContentToString?: boolean;\n    }\n  ): ChatGeneration | undefined {\n    const responseBody = response ?? {};\n    if (provider === \"anthropic\") {\n      if (responseBody.type === \"message\") {\n        return parseMessage(responseBody);\n      } else if (responseBody.type === \"message_start\") {\n        return parseMessage(responseBody.message, true);\n      }\n      const chunk = _makeMessageChunkFromAnthropicEvent(response, {\n        coerceContentToString: fields?.coerceContentToString,\n      });\n      if (!chunk) return undefined;\n\n      const newToolCallChunk = extractToolCallChunk(chunk);\n      let toolUseContent;\n      const extractedContent = extractToolUseContent(chunk, undefined);\n      if (extractedContent) {\n        toolUseContent = extractedContent.toolUseContent;\n      }\n      // Filter partial `tool_use` content, and only add `tool_use` chunks if complete JSON available.\n      const chunkContent = Array.isArray(chunk.content)\n        ? chunk.content.filter((c) => c.type !== \"tool_use\")\n        : chunk.content;\n      if (Array.isArray(chunkContent) && toolUseContent) {\n        chunkContent.push(toolUseContent);\n      }\n      // Extract the text content token for text field and runManager.\n      const token = extractToken(chunk);\n      return new ChatGenerationChunk({\n        message: new AIMessageChunk({\n          content: chunkContent,\n          additional_kwargs: chunk.additional_kwargs,\n          tool_call_chunks: newToolCallChunk ? [newToolCallChunk] : undefined,\n          usage_metadata: chunk.usage_metadata,\n          response_metadata: chunk.response_metadata,\n        }),\n        // Backwards compatibility\n        generationInfo: { ...chunk.response_metadata },\n        text: token ?? \"\",\n      });\n    } else if (provider === \"cohere\") {\n      if (responseBody.event_type === \"stream-start\") {\n        return parseMessageCohere(responseBody.message, true);\n      } else if (\n        responseBody.event_type === \"text-generation\" &&\n        typeof responseBody?.text === \"string\"\n      ) {\n        return new ChatGenerationChunk({\n          message: new AIMessageChunk({\n            content: responseBody.text,\n          }),\n          text: responseBody.text,\n        });\n      } else if (responseBody.event_type === \"search-queries-generation\") {\n        return parseMessageCohere(responseBody);\n      } else if (\n        responseBody.event_type === \"stream-end\" &&\n        responseBody.response !== undefined &&\n        responseBody[\"amazon-bedrock-invocationMetrics\"] !== undefined\n      ) {\n        return new ChatGenerationChunk({\n          message: new AIMessageChunk({ content: \"\" }),\n          text: \"\",\n          generationInfo: {\n            response: responseBody.response,\n            \"amazon-bedrock-invocationMetrics\":\n              responseBody[\"amazon-bedrock-invocationMetrics\"],\n          },\n        });\n      } else {\n        if (\n          responseBody.finish_reason === \"COMPLETE\" ||\n          responseBody.finish_reason === \"MAX_TOKENS\"\n        ) {\n          return parseMessageCohere(responseBody);\n        } else {\n          return undefined;\n        }\n      }\n    } else {\n      throw new Error(\n        \"The messages API is currently only supported by Anthropic or Cohere.\"\n      );\n    }\n  }\n}\n\n// oxlint-disable-next-line typescript/no-explicit-any\nfunction parseMessage(responseBody: any, asChunk?: boolean): ChatGeneration {\n  const { content, id, ...generationInfo } = responseBody;\n  let parsedContent;\n  if (\n    Array.isArray(content) &&\n    content.length === 1 &&\n    content[0].type === \"text\"\n  ) {\n    parsedContent = content[0].text;\n  } else if (Array.isArray(content) && content.length === 0) {\n    parsedContent = \"\";\n  } else {\n    parsedContent = content;\n  }\n  if (asChunk) {\n    return new ChatGenerationChunk({\n      message: new AIMessageChunk({\n        content: parsedContent,\n        additional_kwargs: { id },\n      }),\n      text: typeof parsedContent === \"string\" ? parsedContent : \"\",\n      generationInfo,\n    });\n  } else {\n    const toolCalls = extractToolCalls(responseBody.content);\n\n    if (toolCalls.length > 0) {\n      return {\n        message: new AIMessage({\n          content: responseBody.content,\n          additional_kwargs: { id },\n          tool_calls: toolCalls,\n        }),\n        text: typeof parsedContent === \"string\" ? parsedContent : \"\",\n        generationInfo,\n      };\n    }\n\n    return {\n      message: new AIMessage({\n        content: parsedContent,\n        additional_kwargs: { id },\n        tool_calls: toolCalls,\n      }),\n      text: typeof parsedContent === \"string\" ? parsedContent : \"\",\n      generationInfo,\n    };\n  }\n}\n\nfunction parseMessageCohere(\n  // oxlint-disable-next-line typescript/no-explicit-any\n  responseBody: any,\n  asChunk?: boolean\n): ChatGeneration {\n  const { text, ...generationInfo } = responseBody;\n  let parsedContent = text;\n  if (typeof text !== \"string\") {\n    parsedContent = \"\";\n  }\n  if (asChunk) {\n    return new ChatGenerationChunk({\n      message: new AIMessageChunk({\n        content: parsedContent,\n      }),\n      text: parsedContent,\n      generationInfo,\n    });\n  } else {\n    return {\n      message: new AIMessage({\n        content: parsedContent,\n      }),\n      text: parsedContent,\n      generationInfo,\n    };\n  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