/**
 * Sort an array of PlainTime values in ascending or descending order.
 *
 * - Returns empty array if no valid times.
 * - Validation is performed on each item in the array.
 *
 * @param times Array of ISO PlainTime strings (e.g. "14:30:00")
 * @param order "asc" for ascending (earliest first) | "desc" for descending (latest first)
 * @returns Sorted array of time strings
 *
 * @example sortTimes(["14:30:00", "09:00:00", "20:45:00"]) // ["09:00:00", "14:30:00", "20:45:00"]
 * @example sortTimes([]) // []
 */
export declare function sortTimes(times: string[], order?: "asc" | "desc"): string[];