/**
 * Validate whether a string is a valid IANA timeZone identifier.
 *
 * - Uses Temporal.ZonedDateTime.from to test timezone validity.
 * - Uses regex to check format.
 * - Returns false for invalid timezone formats.
 *
 * @param timeZone timeZone identifier to validate
 * @returns boolean indicating validity
 *
 * @example isValidTimeZone("America/New_York") // true
 * @example isValidTimeZone("Europe/London") // true
 * @example isValidTimeZone("Invalid/Timezone") // false
 */
export declare function isValidTimeZone(timeZone: string): boolean;