import Subscription from './Contracts/Subscription';
declare class SubscriptionManager {
    /**
     *
     *
     * @type {Map<string, Function>}
     */
    private subscribers;
    /**
     *
     *
     * @type {number}
     */
    private idCounter;
    /**
     *
     *
     * @type {IterableIterator<string>}
     */
    private idGenerator;
    /**
     *
     *
     * @return {SubscriptionManager}
     */
    constructor();
    /**
     *
     *
     * @param  {Subscription} subscription
     * @return {string}
     */
    add(subscription: Subscription): string;
    /**
     *
     *
     * @param  {string} subscriberId
     * @return {boolean}
     */
    remove(subscriberId: string): boolean;
    /**
     *
     *
     * @param {object | null}
     */
    notify(payload: object | null): void;
    /**
     *
     *
     * @return {IterableIterator<string>}
     */
    private subscriptionIDGenerator;
}
export default SubscriptionManager;