code: function markdownToHtml(markdownString, allowUnsafeHtml, options) {
    if (!defined(markdownString) || markdownString.length === 0) {
      return markdownString;
    }
    // If the text looks like html, don't try to interpret it as Markdown because
    // we'll probably break it in the process.
    // It would wrap non-standard tags such as <collapsible>hi</collapsible> in a <p></p>, which is bad.
    var unsafeHtml;
    if (htmlRegex.test(markdownString)) {
      unsafeHtml = markdownString;
    } else {
      // MarkdownIt can't handle something that is not a string primitve.  It can't even handle
      // something that is a string object (instanceof String) rather a string primitive
      // (typeof string === 'string').  So if this isn't a string primitive, call toString
      // on it in order to make it one.
      if (markdownString && typeof markdownString !== "string") {
        markdownString = markdownString.toString();
      }
  
      unsafeHtml = md.render(markdownString);
    }
    if (allowUnsafeHtml) {
      return unsafeHtml;
    } else {
      return DOMPurify.sanitize(unsafeHtml, options);
    }
  }
docs: Convert a String in markdown format (which includes html) into html format.
  @param  {String} markdownString String in markdown format.
  @param  {Boolean} allowUnsafeHtml Pass true to allow unsafe html. Defaults to false.
  @param  {Object} [options] Options to pass to DOMPurify, eg. {ADD_TAGS: ['ying', 'yang']} (https://github.com/cure53/DOMPurify).
  @return {String} HTML-formatted string.