export declare type TimeListener = (time: number) => void;
export declare class Timer {
    private timeMs;
    private speed;
    private timerInterval;
    private direction;
    private interval;
    private listeners;
    constructor(speed?: number, intervalMs?: number);
    start(): void;
    stop(): void;
    pause(): void;
    addListener(l: TimeListener): void;
    clearListeners(): void;
    get Time(): number;
    set Time(t: number);
    get Speed(): number;
    set Speed(s: number);
    get isRunning(): boolean;
    set Direction(d: 'forward' | 'backward');
    private intervalCallback;
}