interface IOption {
    leading: boolean;
}
/**
 * Convert a number in milliseconds to a standard duration string.
 * @param {number} ms - duration in milliseconds
 * @param {IOption} options - formatDuration options object
 * @param {boolean} [options.leading=false] - add leading zero
 * @returns string - formatted duration string
 */
declare function formatDuration(ms: number, options?: IOption): string;
export { formatDuration };
export default formatDuration;