/**
 * Return the week of the year (1-53) for a given ISO 8601 zoned datetime string.
 *
 * - By default uses ISO weeks (Monday-based).
 * - Returns null for invalid input.
 *
 * @param value ISO zoned datetime string
 * @param optionsArg optional: weekStartsOn ("monday" | "sunday") for week calculations
 * @returns Week number (1-53) or null on invalid input
 *
 * @example parseWeekFromZoned("2024-01-01T14:30:45.123+00:00[UTC]") // 1
 * @example parseWeekFromZoned("2024-01-08T14:30:45.123+00:00[UTC]") // 2
 * @example parseWeekFromZoned("invalid") // null
 */
export declare function parseWeekFromZoned(value: string, optionsArg?: {
    weekStartsOn?: "monday" | "sunday";
}): number | null;