/**
 * Parse the Accept-Language header and return the best language match.
 *
 * Uses the `negotiator` library.
 *
 * @param headers - HTTP request headers.
 * @param locales - List of supported locales.
 * @returns The best matching locale or undefined if no match is found.
 */
declare function negotiateClientLocale(headers: Record<string, string | undefined>, locales: readonly string[]): string | undefined;

export { negotiateClientLocale };