import { Subject } from 'rxjs';
import * as i0 from "@angular/core";
export declare class PghCountdownTimerService {
    static readonly DEFAULT_DURATION = 20;
    restartTimerSubject: Subject<number>;
    restartTimer$: import("rxjs").Observable<number>;
    restartTimer(duration?: number): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<PghCountdownTimerService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<PghCountdownTimerService>;
}