import Observable, { IObservable, IObserver } from "./Observable";
import Subscription, { ISubscription, Subscriber } from "./Subscription";
export default class Subject<T> extends Observable<T> implements IObservable<T>, ISubscription {
    private observers;
    constructor();
    next(x: T): void;
    error(err: Error): void;
    complete(): void;
    protected _subscribe(observer: IObserver<T>, subscriber: Subscriber<T>): Subscription<T>;
    unsubscribe(): void;
    closed(): boolean;
}