import { Duration, DurationInput } from './types';
/**
 * Gets the negative of the input duration.
 *
 * @example
 * negate({ days: -1 }) // { days: 1 }
 * negate({ days: -1, hours 2 }) // { days: 1, hours: -2 }
 */
export declare const negate: (duration: DurationInput) => Duration;