import type { Duration, DurationInput } from '../types';
/**
 * Get an indication of whether all of the non-zero units in a duration are
 * negative. If they are, return a positive representation of the duration,
 * with `isAllNegative` set to `true`.
 */
export declare const checkAllUnitsNegative: (duration: DurationInput) => {
    isAllNegative: boolean;
    maybeAbsDuration: Duration;
};