import type { NodeWithScore } from "./Node.js";
import type { ChatMessage, ChatResponse, ChatResponseChunk } from "./llm/types.js";
export declare class EngineResponse implements ChatResponse, ChatResponseChunk {
    #private;
    sourceNodes?: NodeWithScore[];
    metadata: Record<string, unknown>;
    message: ChatMessage;
    raw: object | null;
    private constructor();
    static fromResponse(response: string, stream: boolean, sourceNodes?: NodeWithScore[]): EngineResponse;
    private static toChatResponse;
    static fromChatResponse(chatResponse: ChatResponse, sourceNodes?: NodeWithScore[]): EngineResponse;
    static fromChatResponseChunk(chunk: ChatResponseChunk, sourceNodes?: NodeWithScore[]): EngineResponse;
    get response(): string;
    get delta(): string;
    toString(): string;
}