docs: function loadPrismLang(lang) {
      if (!lang) return undefined;
      let langObject = Prism.languages[lang];
      if (langObject === undefined) {
          try {
              require('prismjs/components/prism-' + lang);
              return Prism.languages[lang];
          } catch (e) {
              // nothing to do
          }
      }
      return langObject;
  }