code: function getCode(code, language) {
      if (prism.languages.hasOwnProperty(language)) {
          code = prism.highlight(code, prism.languages[language]);
          return `<pre class="language-${language}"><code>${code}</code></pre>`;
      } else {
          return `<pre class="language-unknown"><code>${code}</code></pre>`;
      }
  }
docs: adds `json` to global `prism.languages` instance