/**
 * Returns the months to show in the dropdown.
 *
 * This function generates a list of months for the current year, formatted
 * using the provided formatter, and determines whether each month should be
 * disabled based on the navigation range.
 *
 * @param displayMonth The currently displayed month.
 * @param navStart The start date for navigation.
 * @param navEnd The end date for navigation.
 * @param formatters The formatters to use for formatting the month labels.
 * @param dateLib The date library to use for date manipulation.
 * @returns An array of dropdown options representing the months, or `undefined`
 *   if no months are available.
 */
function getMonthOptions(displayMonth, navStart, navEnd, formatters, dateLib) {
    const { startOfMonth, startOfYear, endOfYear, eachMonthOfInterval, getMonth, } = dateLib;
    const months = eachMonthOfInterval({
        start: startOfYear(displayMonth),
        end: endOfYear(displayMonth),
    });
    const options = months.map((month) => {
        const label = formatters.formatMonthDropdown(month, dateLib);
        const value = getMonth(month);
        const disabled = (navStart && month < startOfMonth(navStart)) ||
            (navEnd && month > startOfMonth(navEnd)) ||
            false;
        return { value, label, disabled };
    });
    return options;
}

export { getMonthOptions };
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