import { SessionState, SessionStore } from '@foal/core';
import { MongoClient } from 'mongodb';
/**
 * MongoDB store.
 *
 * @export
 * @class MongoDBStore
 * @extends {SessionStore}
 */
export declare class MongoDBStore extends SessionStore {
    private mongoDBClient;
    private collection;
    setMongoDBClient(mongoDBClient: MongoClient): void;
    boot(): Promise<void>;
    save(state: SessionState, maxInactivity: number): Promise<void>;
    read(id: string): Promise<SessionState | null>;
    update(state: SessionState, maxInactivity: number): Promise<void>;
    destroy(id: string): Promise<void>;
    clear(): Promise<void>;
    cleanUpExpiredSessions(maxInactivity: number, maxLifeTime: number): Promise<void>;
    /**
     * Closes the connection to the database.
     *
     * @memberof MongoDBStore
     */
    close(): Promise<void>;
}