@copilotkit/runtime/src/service-adapters/langchain/types.ts

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import { AIMessage, AIMessageChunk, BaseMessageChunk } from "@langchain/core/messages";
import {
  IterableReadableStream,
  IterableReadableStreamInterface,
} from "@langchain/core/utils/stream";

export type LangChainBaseMessageChunkStream = IterableReadableStream<BaseMessageChunk>;
export type LangChainAIMessageChunkStream = IterableReadableStreamInterface<AIMessageChunk>;
export type LangChainReturnType =
  | LangChainBaseMessageChunkStream
  | LangChainAIMessageChunkStream
  | BaseMessageChunk
  | string
  | AIMessage;