declare class MongoClient {
    private _databaseName;
    private selectedDatabase;
    private selectedCollection;
    constructor(databaseName: string);
    database(databaseName: string): MongoClient;
    collection(collectionName: string): MongoClient;
    findOne(query: any, collectionName?: string): Promise<any>;
    find(query: any, collectionName?: string): Promise<any>;
    findById(id: any, collectionName?: string): Promise<any>;
}
export default MongoClient;