import { Event } from '../model/event';
import { Stream } from '../model/stream';
import { PersistenceProvider } from './provider';
/**
 * A Persistence Provider that handle all the data in mongodb.
 */
export declare class MongoProvider implements PersistenceProvider {
    private mongoURL;
    private eventCollection;
    private countersCollection;
    private mongoClient;
    constructor(url: string);
    addEvent(stream: Stream, data: any, type?: string): Promise<Event>;
    getEvents(stream: Stream, offset?: number, limit?: number): Promise<any[]>;
    getAggregations(offset?: number, limit?: number): Promise<Array<string>>;
    getStreams(aggregation: string, offset?: number, limit?: number): Promise<Array<string>>;
    private getKey;
    private events;
    private counters;
    private getMongoClient;
    private getNextSequenceValue;
}