import { EventEmitter, NgZone } from '@angular/core';
/**
 * Mock synchronous NgZone implementation that can be used
 * to flush out `onStable` subscriptions in tests.
 */
export declare class MockNgZone extends NgZone {
    onStable: EventEmitter<any>;
    constructor();
    run(fn: Function): any;
    runOutsideAngular(fn: Function): any;
    simulateZoneExit(): void;
}