/**
 * registerLanguageHandler is global function to register language handler.
 * @param handler a function that returns the original language string.
 */
export declare const registerLanguageHandler: (handler: () => string) => void;
/**
 * getDetectedLanguage is global function to get detected and normalized language.
 * @returns normalized language code (e.g. "en", "zh", "zh-Hant"), default to "en" if not registered or error occurs.
 */
export declare const getDetectedLanguage: () => string;