import { moment } from '../../libs';
export declare type TimerUnit = 'msec' | 'ms' | 'sec' | 's';
export declare type ITimer = {
    startedAt: Date;
    reset: () => ITimer;
    elapsed: (unit?: TimerUnit) => number;
};
export declare function timer(start?: Date): ITimer;
export declare function elapsed(from: Date): moment.Duration;