import { TimeUnit } from '../types';
export declare class Duration {
    private milliseconds;
    constructor(milliseconds: number);
    /**
     * Gets the duration in a specific unit of time.
     * @param unit The unit to get the duration in (e.g., 'days', 'hours').
     * @returns The duration as a number.
     */
    as(unit: TimeUnit): number;
}