/**
 * Message conversion utilities between LangChain and AI SDK formats
 */
import { BaseMessage } from "@langchain/core/messages";
import { ChatResult, ChatGenerationChunk } from "@langchain/core/outputs";
import { type GenerateTextResult, type ToolSet, type ModelMessage, type StreamTextResult } from "ai";
/**
 * Convert LangChain messages to AI SDK ModelMessage format
 */
export declare function convertLangChainToModelMessages(messages: BaseMessage[]): ModelMessage[];
/**
 * Convert AI SDK generateText result to LangChain ChatResult
 */
export declare function convertGenerateTextResultToChatResult(result: GenerateTextResult<ToolSet, any>): ChatResult;
/**
 * Convert AI SDK streamText result to async generator of LangChain ChatGenerationChunk
 *
 * This function handles the TextStreamPart events from streamText's fullStream,
 * which provides normalized events across all providers.
 */
export declare function convertStreamTextResultToChunks(result: StreamTextResult<ToolSet, any>): AsyncGenerator<ChatGenerationChunk>;