export interface IObservers {
    id: string;
    topic: string;
    callback: Function;
    once: boolean;
}
export declare class PubSub {
    private pubsubId;
    private topics;
    subscribe(topic: string, callback: Function, once?: boolean): IObservers;
    subscribeOnce(topic: string, callback: Function): IObservers;
    publish(topic: string, data: any): Promise<any>;
    unSubscribe(id: string): boolean;
}
declare const PubSubMQ: PubSub;
export default PubSubMQ;