@burglekitt/gmt/dist/internal/getLocaleWeekendDays.js

Temporal-based date and time utilities with timezone support and polyfill integration

/**
 * Resolve the set of ISO day-of-week numbers (1 = Monday .. 7 = Sunday)
 * that count as "weekend" for a locale, via `Intl.Locale.prototype.weekInfo`.
 *
 * - Returns `null` if `locale` is not a valid BCP 47 tag.
 * - Falls back to Saturday/Sunday (`[6, 7]`) if `weekInfo` is unavailable
 *   on the runtime (older engines) or unresolvable for the given locale.
 */
export function getLocaleWeekendDays(locale) {
    try {
        const weekInfo = new Intl.Locale(locale).weekInfo;
        if (!weekInfo || !Array.isArray(weekInfo.weekend)) {
            return new Set([6, 7]);
        }
        return new Set(weekInfo.weekend);
    }
    catch {
        return null;
    }
}