interface LocaleWeekInfo {
    firstDay: number;
    weekend: number[];
    minimalDays: number;
}
declare global {
    namespace Intl {
        interface Locale {
            readonly weekInfo: LocaleWeekInfo;
        }
    }
}
/**
 * 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 declare function getLocaleWeekendDays(locale: string): Set<number> | null;
export {};