declare class PubSub {
    private subscribers;
    constructor();
    /**
     * event to publish
     * @param type  type of event
     * @param payload any object
     */
    publish(type: string, payload: any): void;
    unsubscribe(type: string, id: string, contextName: string): void;
    unsubscribeAllWithEventType(type: string): void;
    subscribe(type: string, id: string | undefined, callback: Function, contextName: string, subscribeOnce: boolean): void;
    clearContext(contextName: string): void;
}
declare const _default: PubSub;
export default _default;