/**
 * Resolves the hour cycle that should be forced based on the current user's time-format preference.
 *
 * Returns `undefined` when the user has chosen "let the language decide" (the default), so that
 * locale-based formatting keeps deciding 12H/24H. Returns `"h12"` for a 12-hour preference and
 * `"h23"` for a 24-hour preference.
 *
 * Pass the result to `formatDateUtil(..., hourCycleOverride)` (or use `useDateAndTime`, `DateTime`,
 * and `DateTimeCell`, which already apply it) to make displayed times honor the preference.
 *
 * @returns {Intl.LocaleHourCycleKey | undefined} The forced hour cycle, or `undefined` to defer to the locale.
 */
export declare const useHourCycle: () => Intl.LocaleHourCycleKey | undefined;