import { MongoClient } from "mongodb";
export declare class DbManager {
    static instance: DbManager | null;
    client: MongoClient;
    private session;
    connected: boolean;
    private url;
    private userSession;
    private packageInfo;
    constructor(userSession?: any, packageInfo?: any);
    setPackageInfo(packageInfo: any): void;
    getPackageInfo(): any;
    setUserSession(userSession: any): void;
    getUserSession(): any;
    connect(): Promise<void>;
    close(): Promise<void>;
    insert(collectionName: string, doc: any, autoGenerateId?: boolean): Promise<any>;
    insertMany(collectionName: string, docs: any[], autoGenerateId?: boolean): Promise<any>;
    delete(collectionName: string, filter: object): Promise<any>;
    deleteMany(collectionName: string, filter: object): Promise<any>;
    directUpdate(collectionName: string, filter: object, update: any): Promise<any>;
    update(collectionName: string, filter: object, update: object): Promise<any>;
    unset(collectionName: string, filter: object, update: object): Promise<any>;
    find(collectionName: string, filter: object, setSpace?: boolean, limit?: any, options?: {}): Promise<any>;
    findOne(collectionName: string, filter: object, setSpace?: boolean, options?: {}): Promise<any>;
    findWithProjection(collectionName: string, filter: object, projection?: object, setSpace?: boolean, limit?: any): Promise<any>;
    findOneWithProjection(collectionName: string, filter: object, projection?: object, setSpace?: boolean): Promise<any>;
    aggregate(collectionName: string, pipeline: object[]): Promise<any>;
    startSession(): Promise<any>;
    endSession(): Promise<any>;
}