import { TimeSpan } from './TimeSpan';
export declare class Stopwatch {
    constructor();
    private _perf_start;
    private _perf_stop;
    private _isRunning;
    isRunning(): boolean;
    static startNew(): Stopwatch;
    start(): void;
    stop(): void;
    reset(): void;
    elapsedMilliseconds(): number;
    getTimespan(): TimeSpan;
}