import { Subscriber, Unsubscribe } from './subject';
export declare class EventSubject<EventType extends Record<string, any>> {
    #private;
    get size(): number;
    subscribe<Event extends keyof EventType>(event: Event, observer: Subscriber<EventType[Event]>): Unsubscribe;
    publish<Event extends keyof EventType>(event: Event, payload: EventType[Event]): void;
}