import type { AppOptions } from "firebase-admin";
import { BaseMessage, BaseListChatMessageHistory } from "../../schema/index.js";
export interface FirestoreDBChatMessageHistory {
    collectionName: string;
    sessionId: string;
    userId: string;
    appIdx?: number;
    config?: AppOptions;
}
export declare class FirestoreChatMessageHistory extends BaseListChatMessageHistory {
    lc_namespace: string[];
    private collectionName;
    private sessionId;
    private userId;
    private appIdx;
    private config;
    private firestoreClient;
    private document;
    constructor({ collectionName, sessionId, userId, appIdx, config, }: FirestoreDBChatMessageHistory);
    private ensureFirestore;
    getMessages(): Promise<BaseMessage[]>;
    addMessage(message: BaseMessage): Promise<void>;
    private upsertMessage;
    clear(): Promise<void>;
}