import type { IsoDuration } from '../../domain.objects/IsoDuration';
import type { IsoDurationWords } from '../../domain.objects/IsoDurationWords';
/**
 * .what = normalizes iso duration to string format
 * .why = enables conversion to iso 8601 string representation
 * .note = if input is already string format, returns as-is
 */
export declare const asIsoDurationWords: (duration: IsoDuration) => IsoDurationWords;