/**
 * Finds and returns the language of an element
 * – traversing up the DOM tree looking for langauge attributes.
 *
 * @param elm Target element - defaults to <html/>
 * @param returnFull `true` returns the full language value – not just the two-character shorthand.
 *
 * Usage:
 * ```js
 * htmlLang(elm);       // returns the language of elm.
 * htmlLang(elm, true); // returns full language code of elm. e.g. "en-uk"
 * htmlLang();          // returns the document language.
 * htmlLang(true);      // returns full document language code. e.g. "en-uk"
 * ```
 */
declare function htmlLang(returnFull?: boolean): string | undefined;
declare function htmlLang(elm?: Node | null, returnFull?: boolean): string | undefined;
export default htmlLang;