import { Disposable } from '@zajno/common/functions/disposer';
export declare class TimerViewModel extends Disposable {
    readonly interval: number;
    private readonly _enabled;
    private readonly _state;
    private _timer;
    constructor(interval?: number);
    get elapsed(): number;
    get left(): number;
    get now(): number;
    get enabled(): boolean;
    start: (duration: number) => void;
    stop: () => void;
    private _onTick;
}