import type { PickOne } from 'type-fns';
import type { IsoDurationShape } from '../../domain.objects/IsoDurationShape';
import type { IsoDateStampRange, IsoTimeStampRange } from '../../domain.objects/IsoTimeStampRange';
/**
 * .what = calculates the duration of a time range
 * .why = enables computing elapsed time between two stamps
 */
export declare const getDuration: (input: {
    /**
     * what measure of time to extract a duration from
     */
    of: PickOne<{
        range: IsoTimeStampRange | IsoDateStampRange;
        milliseconds: number;
    }>;
    /**
     * the unit to define the duration in, if desired
     *
     * note
     * - by default, it will define it via all of them
     */
    as?: keyof IsoDurationShape;
}) => IsoDurationShape;