/**
 * Return true when intervals `[aStart, aEnd]` and `[bStart, bEnd]` share at least one instant.
 *
 * - Uses `Temporal.PlainTime.compare` for comparison.
 * - Adjacent intervals (e.g. `aEnd === bStart`) do NOT overlap — returns `false`.
 * - Returns `false` if either interval is invalid (`start > end`).
 * - Returns `false` on invalid input (wrong type, malformed strings).
 *
 * @param aStart ISO 8601 time string for the first interval start
 * @param aEnd ISO 8601 time string for the first interval end
 * @param bStart ISO 8601 time string for the second interval start
 * @param bEnd ISO 8601 time string for the second interval end
 * @returns true if intervals overlap, or false on invalid input
 *
 * @example intervalsOverlapTime("09:00:00", "17:00:00", "12:00:00", "18:00:00") // true
 * @example intervalsOverlapTime("09:00:00", "17:00:00", "17:00:00", "18:00:00") // false (adjacent)
 * @example intervalsOverlapTime("09:00:00", "17:00:00", "18:00:00", "20:00:00") // false (disjoint)
 * @example intervalsOverlapTime("09:00:00", "17:00:00", "10:00:00", "11:00:00") // true (contained)
 * @example intervalsOverlapTime("invalid", "17:00:00", "12:00:00", "18:00:00") // false
 */
export declare function intervalsOverlapTime(aStart: string, aEnd: string, bStart: string, bEnd: string): boolean;