import { MongoClientOptions } from 'mongodb';
import { CollectionStore } from '../../models';
export declare class MongoDb {
    private static _archiveCollections;
    private static _db;
    private static _client;
    private static _session;
    private static _existCollections;
    private static _collectionList;
    static readonly Collections: CollectionStore[];
    static Archive: boolean;
    static createCollections(clear: boolean): Promise<void>;
    static beginTransaction(): any;
    static commitTransaction(): Promise<void>;
    static rollbackTransaction(): Promise<void>;
    static connect(url: string, database: string, opts: MongoClientOptions, transactionLockTimeout: number): Promise<void>;
    static close(): Promise<void>;
    private static _createCollection;
}