@langchain/community/dist/chat_models/premai.cjs.map

Third-party integrations for LangChain.js

{"version":3,"file":"premai.cjs","names":["ChatMessage","AIMessage","HumanMessageChunk","AIMessageChunk","ChatMessageChunk","BaseChatModel","Prem","ChatGenerationChunk"],"sources":["../../src/chat_models/premai.ts"],"sourcesContent":["import {\n  AIMessage,\n  AIMessageChunk,\n  type BaseMessage,\n  ChatMessage,\n  ChatMessageChunk,\n  HumanMessageChunk,\n} from \"@langchain/core/messages\";\nimport {\n  type BaseLanguageModelCallOptions,\n  TokenUsage,\n} from \"@langchain/core/language_models/base\";\n\nimport { CallbackManagerForLLMRun } from \"@langchain/core/callbacks/manager\";\nimport {\n  type BaseChatModelParams,\n  BaseChatModel,\n} from \"@langchain/core/language_models/chat_models\";\n\nimport Prem, {\n  ChatCompletionStreamingCompletionData,\n  CreateChatCompletionRequest,\n  CreateChatCompletionResponse,\n} from \"@premai/prem-sdk\";\nimport { getEnvironmentVariable } from \"@langchain/core/utils/env\";\nimport {\n  ChatGeneration,\n  ChatGenerationChunk,\n  ChatResult,\n} from \"@langchain/core/outputs\";\n\nimport { NewTokenIndices } from \"@langchain/core/callbacks/base\";\n\nexport type RoleEnum = \"user\" | \"assistant\";\n\n/**\n * Input to chat model class.\n */\nexport interface ChatPremInput extends BaseChatModelParams {\n  project_id?: number | string;\n  session_id?: string;\n  messages?: {\n    role: \"user\" | \"assistant\";\n    content: string;\n    [k: string]: unknown;\n  }[];\n  model?: string;\n  system_prompt?: string;\n  frequency_penalty?: number;\n  logit_bias?: { [k: string]: unknown };\n  max_tokens?: number;\n  n?: number;\n  presence_penalty?: number;\n  response_format?: { [k: string]: unknown };\n  seed?: number;\n  stop?: string;\n  temperature?: number;\n  top_p?: number;\n  tools?: { [k: string]: unknown }[];\n  user?: string;\n  /**\n   * The Prem API key to use for requests.\n   * @default process.env.PREM_API_KEY\n   */\n  apiKey?: string;\n  streaming?: boolean;\n}\n\nexport interface ChatCompletionCreateParamsNonStreaming extends CreateChatCompletionRequest {\n  stream?: false;\n}\n\nexport interface ChatCompletionCreateParamsStreaming extends CreateChatCompletionRequest {\n  stream: true;\n}\n\nexport type ChatCompletionCreateParams =\n  | ChatCompletionCreateParamsNonStreaming\n  | ChatCompletionCreateParamsStreaming;\n\nfunction extractGenericMessageCustomRole(message: ChatMessage) {\n  if (message.role !== \"assistant\" && message.role !== \"user\") {\n    console.warn(`Unknown message role: ${message.role}`);\n  }\n  return message.role as RoleEnum;\n}\n\nexport function messageToPremRole(message: BaseMessage): RoleEnum {\n  const type = message._getType();\n  switch (type) {\n    case \"ai\":\n      return \"assistant\";\n    case \"human\":\n      return \"user\";\n    case \"generic\": {\n      if (!ChatMessage.isInstance(message))\n        throw new Error(\"Invalid generic chat message\");\n      return extractGenericMessageCustomRole(message);\n    }\n    default:\n      throw new Error(`Unknown message type: ${type}`);\n  }\n}\n\nfunction convertMessagesToPremParams(\n  messages: BaseMessage[]\n): Array<CreateChatCompletionResponse[\"choices\"][\"0\"][\"message\"]> {\n  return messages.map((message) => {\n    if (typeof message.content !== \"string\") {\n      throw new Error(\"Non string message content not supported\");\n    }\n    return {\n      role: messageToPremRole(message),\n      content: message.content,\n      name: message.name,\n      function_call: message.additional_kwargs.function_call,\n    };\n  });\n}\n\nfunction premResponseToChatMessage(\n  message: CreateChatCompletionResponse[\"choices\"][\"0\"][\"message\"]\n): BaseMessage {\n  switch (message.role) {\n    case \"assistant\":\n      return new AIMessage(message.content as string);\n    default:\n      return new ChatMessage(\n        message.content as string,\n        message.role ?? \"unknown\"\n      );\n  }\n}\n\nfunction _convertDeltaToMessageChunk(\n  // oxlint-disable-next-line typescript/no-explicit-any\n  delta: Record<string, any>\n) {\n  const { role } = delta;\n  const content = delta.content ?? \"\";\n  let additional_kwargs;\n  if (delta.function_call) {\n    additional_kwargs = {\n      function_call: delta.function_call,\n    };\n  } else {\n    additional_kwargs = {};\n  }\n  if (role === \"user\") {\n    return new HumanMessageChunk({ content });\n  } else if (role === \"assistant\") {\n    return new AIMessageChunk({ content, additional_kwargs });\n  } else {\n    return new ChatMessageChunk({ content, role });\n  }\n}\n\n/**\n * Integration with a chat model.\n */\nexport class ChatPrem<\n  CallOptions extends BaseLanguageModelCallOptions =\n    BaseLanguageModelCallOptions,\n>\n  extends BaseChatModel<CallOptions>\n  implements ChatPremInput\n{\n  client: Prem;\n\n  apiKey?: string;\n\n  project_id: number;\n\n  session_id?: string;\n\n  messages: {\n    [k: string]: unknown;\n    role: \"user\" | \"assistant\";\n    content: string;\n  }[];\n\n  model?: string;\n\n  system_prompt?: string;\n\n  frequency_penalty?: number;\n\n  logit_bias?: { [k: string]: unknown };\n\n  max_tokens?: number;\n\n  n?: number;\n\n  presence_penalty?: number;\n\n  response_format?: { [k: string]: unknown };\n\n  seed?: number;\n\n  stop?: string;\n\n  temperature?: number;\n\n  top_p?: number;\n\n  tools?: { [k: string]: unknown }[];\n\n  user?: string;\n\n  streaming = false;\n\n  [k: string]: unknown;\n\n  // Used for tracing, replace with the same name as your class\n  static lc_name() {\n    return \"ChatPrem\";\n  }\n\n  lc_serializable = true;\n\n  /**\n   * Replace with any secrets this class passes to `super`.\n   * See {@link ../../langchain-cohere/src/chat_model.ts} for\n   * an example.\n   */\n  get lc_secrets(): { [key: string]: string } | undefined {\n    return {\n      apiKey: \"PREM_API_KEY\",\n    };\n  }\n\n  get lc_aliases(): { [key: string]: string } | undefined {\n    return {\n      apiKey: \"PREM_API_KEY\",\n    };\n  }\n\n  constructor(fields?: ChatPremInput) {\n    super(fields ?? {});\n    const apiKey = fields?.apiKey ?? getEnvironmentVariable(\"PREM_API_KEY\");\n    if (!apiKey) {\n      throw new Error(\n        `Prem API key not found. Please set the PREM_API_KEY environment variable or provide the key into \"apiKey\"`\n      );\n    }\n\n    const projectId =\n      fields?.project_id ??\n      parseInt(getEnvironmentVariable(\"PREM_PROJECT_ID\") ?? \"-1\", 10);\n    if (!projectId || projectId === -1 || typeof projectId !== \"number\") {\n      throw new Error(\n        `Prem project ID not found. Please set the PREM_PROJECT_ID environment variable or provide the key into \"project_id\"`\n      );\n    }\n\n    this.client = new Prem({\n      apiKey,\n    });\n\n    this.project_id = projectId;\n    this.session_id = fields?.session_id ?? this.session_id;\n    this.messages = fields?.messages ?? this.messages;\n    this.model = fields?.model ?? this.model;\n    this.system_prompt = fields?.system_prompt ?? this.system_prompt;\n    this.frequency_penalty =\n      fields?.frequency_penalty ?? this.frequency_penalty;\n    this.logit_bias = fields?.logit_bias ?? this.logit_bias;\n    this.max_tokens = fields?.max_tokens ?? this.max_tokens;\n    this.n = fields?.n ?? this.n;\n    this.presence_penalty = fields?.presence_penalty ?? this.presence_penalty;\n    this.response_format = fields?.response_format ?? this.response_format;\n    this.seed = fields?.seed ?? this.seed;\n    this.stop = fields?.stop ?? this.stop;\n    this.temperature = fields?.temperature ?? this.temperature;\n    this.top_p = fields?.top_p ?? this.top_p;\n    this.tools = fields?.tools ?? this.tools;\n    this.user = fields?.user ?? this.user;\n    this.streaming = fields?.streaming ?? this.streaming;\n  }\n\n  // Replace\n  _llmType() {\n    return \"prem\";\n  }\n\n  async completionWithRetry(\n    request: ChatCompletionCreateParamsStreaming,\n    // oxlint-disable-next-line typescript/no-explicit-any\n    options?: any\n  ): Promise<AsyncIterable<ChatCompletionStreamingCompletionData>>;\n\n  async completionWithRetry(\n    request: ChatCompletionCreateParams,\n    // oxlint-disable-next-line typescript/no-explicit-any\n    options?: any\n  ): Promise<CreateChatCompletionResponse>;\n\n  async completionWithRetry(\n    request: ChatCompletionCreateParamsStreaming,\n    // oxlint-disable-next-line typescript/no-explicit-any\n    options?: any\n  ): Promise<\n    | AsyncIterable<ChatCompletionStreamingCompletionData>\n    | CreateChatCompletionResponse\n  > {\n    return this.caller.call(async () =>\n      this.client.chat.completions.create(request, options)\n    );\n  }\n\n  invocationParams(options: this[\"ParsedCallOptions\"]) {\n    const params = super.invocationParams(options);\n    return {\n      ...params,\n      project_id: this.project_id,\n      session_id: this.session_id,\n      messages: this.messages,\n      model: this.model,\n      system_prompt: this.system_prompt,\n      frequency_penalty: this.frequency_penalty,\n      logit_bias: this.logit_bias,\n      max_tokens: this.max_tokens,\n      n: this.n,\n      presence_penalty: this.presence_penalty,\n      response_format: this.response_format,\n      seed: this.seed,\n      stop: this.stop,\n      temperature: this.temperature,\n      top_p: this.top_p,\n      tools: this.tools,\n      user: this.user,\n      streaming: this.streaming,\n      stream: this.streaming,\n    };\n  }\n\n  /**\n   * Implement to support streaming.\n   * Should yield chunks iteratively.\n   */\n  async *_streamResponseChunks(\n    messages: BaseMessage[],\n    options: this[\"ParsedCallOptions\"],\n    runManager?: CallbackManagerForLLMRun\n  ): AsyncGenerator<ChatGenerationChunk> {\n    const params = this.invocationParams(options);\n    const messagesMapped = convertMessagesToPremParams(messages);\n\n    // All models have a built-in `this.caller` property for retries\n    const stream = await this.caller.call(async () =>\n      this.completionWithRetry(\n        {\n          ...params,\n          messages: messagesMapped,\n          stream: true,\n        },\n        params\n      )\n    );\n\n    for await (const data of stream) {\n      const choice = data?.choices[0];\n      if (!choice) {\n        continue;\n      }\n      const chunk = new ChatGenerationChunk({\n        message: _convertDeltaToMessageChunk(choice.delta ?? {}),\n        text: choice.delta.content ?? \"\",\n        generationInfo: {\n          finishReason: choice.finish_reason,\n        },\n      });\n      yield chunk;\n      // eslint-disable-next-line no-void\n      void runManager?.handleLLMNewToken(chunk.text ?? \"\");\n    }\n    if (options.signal?.aborted) {\n      throw new Error(\"AbortError\");\n    }\n  }\n\n  /** @ignore */\n  _combineLLMOutput() {\n    return [];\n  }\n\n  async _generate(\n    messages: BaseMessage[],\n    options: this[\"ParsedCallOptions\"],\n    runManager?: CallbackManagerForLLMRun\n  ): Promise<ChatResult> {\n    const tokenUsage: TokenUsage = {};\n    const params = this.invocationParams(options);\n    const messagesMapped = convertMessagesToPremParams(messages);\n\n    if (params.streaming) {\n      const stream = this._streamResponseChunks(messages, options, runManager);\n      const finalChunks: Record<number, ChatGenerationChunk> = {};\n      for await (const chunk of stream) {\n        const index =\n          (chunk.generationInfo as NewTokenIndices)?.completion ?? 0;\n        if (finalChunks[index] === undefined) {\n          finalChunks[index] = chunk;\n        } else {\n          finalChunks[index] = finalChunks[index].concat(chunk);\n        }\n      }\n      const generations = Object.entries(finalChunks)\n        .sort(([aKey], [bKey]) => parseInt(aKey, 10) - parseInt(bKey, 10))\n        .map(([_, value]) => value);\n\n      return { generations, llmOutput: { estimatedTokenUsage: tokenUsage } };\n    } else {\n      const data = await this.completionWithRetry(\n        {\n          ...params,\n          stream: false,\n          messages: messagesMapped,\n        },\n        {\n          signal: options?.signal,\n        }\n      );\n\n      if (\"usage\" in data && data.usage) {\n        const {\n          completion_tokens: completionTokens,\n          prompt_tokens: promptTokens,\n          total_tokens: totalTokens,\n        } = data.usage as CreateChatCompletionResponse[\"usage\"];\n\n        if (completionTokens) {\n          tokenUsage.completionTokens =\n            (tokenUsage.completionTokens ?? 0) + completionTokens;\n        }\n\n        if (promptTokens) {\n          tokenUsage.promptTokens =\n            (tokenUsage.promptTokens ?? 0) + promptTokens;\n        }\n\n        if (totalTokens) {\n          tokenUsage.totalTokens = (tokenUsage.totalTokens ?? 0) + totalTokens;\n        }\n      }\n\n      const generations: ChatGeneration[] = [];\n\n      if (\"choices\" in data && data.choices) {\n        for (const part of (data as unknown as CreateChatCompletionResponse)\n          .choices) {\n          const text = part.message?.content ?? \"\";\n          const generation: ChatGeneration = {\n            text: text as string,\n            message: premResponseToChatMessage(\n              part.message ?? { role: \"assistant\" }\n            ),\n          };\n          generation.generationInfo = {\n            ...(part.finish_reason\n              ? { finish_reason: part.finish_reason }\n              : {}),\n            ...(part.logprobs ? { logprobs: part.logprobs } : {}),\n          };\n          generations.push(generation);\n        }\n      }\n\n      return {\n        generations,\n        llmOutput: { tokenUsage },\n      };\n    }\n  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