import type { TimeUnit } from './unit';
/**
 * Check whether timeConvert can convert between the provided units.
 * @param from
 * @param to
 * @param value
 * @returns
 */
export declare function canConvert(from: TimeUnit, to: TimeUnit, value?: number | null): value is number;
/**
 * Convert value to a different time unit.
 * @param from
 * @param to
 * @param value
 * @param decimals
 * @returns
 */
export declare function timeConvert(from: TimeUnit, to: TimeUnit, value?: number | null, decimals?: number): number | null;