/**
 * https://tc39.es/ecma402/#sec-supportedlocales
 * @param availableLocales
 * @param requestedLocales
 * @param options
 */
export declare function SupportedLocales(availableLocales: Set<string>, requestedLocales: string[], options?: {
    localeMatcher?: 'best fit' | 'lookup';
}): string[];
