import type { AppOptions } from "firebase-admin";
import { BaseListChatMessageHistory } from "@langchain/core/chat_history";
import { BaseMessage } from "@langchain/core/messages";
/**
 * Interface for FirestoreDBChatMessageHistory. It includes the collection
 * name, session ID, user ID, and optionally, the app index and
 * configuration for the Firebase app.
 */
export interface FirestoreDBChatMessageHistory {
    /**
     * An array of collection names, should match the length of `docs` field.
     * @TODO make required variable in 0.2
     */
    collections?: string[];
    /**
     * An array of doc names, should match the length of `collections` field,
     * or undefined if the collections field has a length of 1. In this case,
     * it will default to use `sessionId` as the doc name.
     * @TODO make required variable in 0.2
     */
    docs?: string[];
    /**
     * @deprecated Will be removed in 0.2 use `collections` field instead.
     */
    collectionName?: string;
    sessionId: string;
    userId: string;
    appIdx?: number;
    config?: AppOptions;
}
/**
 * Class for managing chat message history using Google's Firestore as a
 * storage backend. Extends the BaseListChatMessageHistory class.
 * @example
 * ```typescript
 * const chatHistory = new FirestoreChatMessageHistory({
 *   collectionName: "langchain",
 *   sessionId: "lc-example",
 *   userId: "a@example.com",
 *   config: { projectId: "your-project-id" },
 * });
 *
 * const chain = new ConversationChain({
 *   llm: new ChatOpenAI(),
 *   memory: new BufferMemory({ chatHistory }),
 * });
 *
 * const response = await chain.invoke({
 *   input: "What did I just say my name was?",
 * });
 * console.log({ response });
 * ```
 */
export declare class FirestoreChatMessageHistory extends BaseListChatMessageHistory {
    lc_namespace: string[];
    private collections;
    private docs;
    private sessionId;
    private userId;
    private appIdx;
    private config;
    private firestoreClient;
    private document;
    constructor({ collectionName, collections, docs, sessionId, userId, appIdx, config, }: FirestoreDBChatMessageHistory);
    private ensureFirestore;
    /**
     * Method to retrieve all messages from the Firestore collection
     * associated with the current session. Returns an array of BaseMessage
     * objects.
     * @returns Array of stored messages
     */
    getMessages(): Promise<BaseMessage[]>;
    /**
     * Method to add a new message to the Firestore collection. The message is
     * passed as a BaseMessage object.
     * @param message The message to be added as a BaseMessage object.
     */
    addMessage(message: BaseMessage): Promise<void>;
    private upsertMessage;
    /**
     * Method to delete all messages from the Firestore collection associated
     * with the current session.
     */
    clear(): Promise<void>;
}