export interface Timer {
    start(): void;
    stop(): void;
    durationInMillis(): number;
}
export declare class TimerFactory {
    private static timerIndex;
    private static timer;
    static setTimer(timer: Timer): void;
    static unsetTimer(): void;
    static newTimer(): Timer;
}
export declare class BrowserTimer implements Timer {
    private index;
    constructor(index: number);
    start(): void;
    stop(): void;
    durationInMillis(): number;
}
export declare class NodeTimer implements Timer {
    private startTime;
    private endTime;
    start(): void;
    stop(): void;
    durationInMillis(): number;
}