export declare type IDuration = {
    ok: boolean;
    msec: number;
    sec: number;
    min: number;
    hour: number;
    day: number;
    toString(unit?: TimeUnit | {
        unit?: TimeUnit;
        round?: number;
    }): string;
};
export declare type TimeUnit = 'msec' | 'ms' | 'sec' | 's' | 'min' | 'm' | 'hour' | 'h' | 'day' | 'd';