/**
 * Sort locales by specificity
 *
 * The languages are sorted in a way that more specific languages are preferred over less specific
 * ones, but languages are never sorted before completely different languages.
 *
 * All languages are converted to lower case for convenience.
 *
 * For examples, see the test cases.
 *
 * @param languages The languages to sort. For example `navigator.languages`.
 * @returns A sorted list of lower case languages in order of preference.
 */
export declare function sortLocales(languages: readonly string[]): string[];
/**
 * @param languages A list of languages supported by the application.
 * @param choices A list of languages preferred by the user in order of preference.
 * @returns The best match
 */
export declare function detectLocale(languages: readonly string[], choices: readonly string[]): string | undefined;