import { Observable } from 'rxjs';
import { BusEvent } from './BusEvent';
/**
 * An event that can be cancelled.
 * @export
 * @class Cancellable
 * @extends {BusEvent<T>}
 * @template T The target type.
 */
export declare class Cancellable<T> extends BusEvent<T> {
    /**
     * Cancels the event. Only valid within the context of the `wait` method.
     * @see {@link BusEvent#wait}
     */
    cancel(): void;
    /**
     * Creates an observable that waits for the results of the event.
     * @returns {Observable<this>}
     * @example
     * const event = new Cancellable(null);
     *
     * bus.emit(event);
     *
     * event.results().subscribe(() => {
     *   // The event was successful and NOT cancelled.
     * });
     */
    results(): Observable<this>;
}