import { IsoDuration } from './iso-types';
declare function isoDuration(fields: {
    years?: number;
    months?: number;
    weeks?: number;
    days?: number;
    hours?: number;
    minutes?: number;
    seconds?: number;
    milliseconds?: number;
}): IsoDuration;
declare function isoDuration(input: string): IsoDuration;
declare function isoDuration(years?: number, months?: number, weeks?: number, days?: number, hours?: number, minutes?: number, seconds?: number, milliseconds?: number): IsoDuration;
export default isoDuration;