import 'dart:html';
            import 'package:js/js.dart';

            @JS('hljs')
            external Hljs get hljs;

            @JS()
            @anonymous
            class Hljs {
              external void initHighlighting();
              external List listLanguages();
            }

            void main() {
              ButtonElement highlighter = querySelector('#highlight');
              ButtonElement showLanguages = querySelector('#showLanguages');

              highlighter.onClick.listen((evt) {
                hljs.initHighlighting();
              });

              showLanguages.onClick.listen((evt) {
                window.alert('Default supported languages: ${hljs.listLanguages().join(', ')}');
              });
            }