export default class Stopwatch {
    private currentTime;
    /**
     * Resets and starts the stopwatch.
     */
    start(): void;
    /**
     * Stops the stopwatch and returns the milliseconds.
     * @param toString
     */
    stop(toString: false): number;
    /**
     * Stops the stopwatch and returns a formatted string with the result.
     * @param toString
     */
    stop(toString: true): string;
}