/**
 * Return the current minute using the system timeZone.
 *
 * - Uses Temporal.Now.plainDateTimeISO to get current minute in system timezone.
 * - Returns zero-padded string (e.g., "30").
 * - Returns "" when system timezone is unavailable.
 *
 * @returns current minute string (zero-padded) or "" on invalid
 *
 * @example getMinute() // "00"
 * @example getMinute() // "" (when system timeZone unavailable)
 */
export declare function getMinute(): string;