/**
 * The function extracts UTC offset in minutes from the given date in specified
 * time zone.
 *
 * Unlike `Date.prototype.getTimezoneOffset`, this function returns the value
 * mirrored to the sign of the offset in the time zone. For Asia/Singapore
 * (UTC+8), `tzOffset` returns 480, while `getTimezoneOffset` returns -480.
 *
 * @param timeZone - Time zone name (IANA or UTC offset)
 * @param date - Date to check the offset for
 *
 * @returns UTC offset in minutes
 */
export declare function tzOffset(timeZone: string | undefined, date: Date): number;