import { Observable } from 'rxjs';
/**
 * This helper can be used to control the completion of another observable.
 *
 * Example:
 * ```
 * private stopper = new ObservableStopper();
 *
 * ngOnInit(): void {
 *      this.myObservable$.pipe(
 *          ...,
 *          takeUntil(this.stopper.stopper$),
 *      ).subscribe((value) => {
 *          ...
 *      })
 * }
 *
 * ngOnDestroy(): void {
 *      this.stopper.stop();
 * }
 * ```
 */
export declare class ObservableStopper {
    private stopperSubj$;
    private pubStopper$;
    /**
     * The multicast observable that will emit and complete when `stop()` is called.
     */
    get stopper$(): Observable<void>;
    constructor();
    /**
     * @returns `true` if this `ObservableStopper` has been stopped, otherwise `false.
     */
    get isStopped(): boolean;
    /**
     * Instructs all observables depending on this `ObservableStopper` to complete.
     */
    stop(): void;
}