/**
 * This method ensures that a locale is valid and supported by browser, and returns it if it is.
 *
 * It used Intl.DateTimeFormat.supportedLocalesOf to decide whether the locale is valid or not.
 * Intl.DateTimeFormat.supportedLocalesOf takes a locale (or a list of locales) and returns:
 * - an array with the locale if it's valid
 * - an empty array if it's valid but not supported
 * - throws an error if it's not valid
 * @param locale locale to validate and return
 * @returns the locale if it's valid, otherwise undefined
 */
declare const getValidLocale: (requestedLocale?: string) => string | undefined;
export default getValidLocale;