import { Agent } from "./agent";
import { LangMessage, LangMessages, LanguageProvider } from "../lang/index.ts";
import { LangMessageItem, LangMessageRole, LangTool } from "../lang/messages";
export type ChatOutput = {
    answer: string;
    messages: LangMessage[];
};
export interface ChatStreamingEvent {
    type: "streaming";
    data: {
        msg: LangMessage;
        idx: number;
    };
}
export declare class ChatAgent extends Agent<{
    role: LangMessageRole;
    items: LangMessageItem[];
}[] | LangMessages | LangMessage[], LangMessages, ChatStreamingEvent> {
    private lang?;
    messages: LangMessages;
    constructor(lang?: LanguageProvider, options?: {
        tools?: LangTool[];
    });
    protected runInternal(input: {
        role: LangMessageRole;
        items: LangMessageItem[];
    }[] | LangMessages | LangMessage[], options?: {
        signal?: AbortSignal;
    }): Promise<LangMessages>;
    getMessages(): LangMessages;
    setLanguageProvider(lang: LanguageProvider): void;
}