chore: import upstream snapshot with attribution

tools/challenge-parser/parser/plugins/utils/mdast-to-html.js

@@ -0,0 +1,18 @@
+const hastToHTML = require('hast-util-to-html');
+const { root } = require('mdast-builder');
+const mdastToHast = require('mdast-util-to-hast');
+
+function mdastToHTML(nodes, hastOptions = {}) {
+  if (!Array.isArray(nodes))
+    throw Error('mdastToHTML expects an array argument');
+  // - the 'nodes' are children, so first need embedding in a parent
+
+  return hastToHTML(
+    mdastToHast(root(nodes), { allowDangerousHtml: true, ...hastOptions }),
+    {
+      allowDangerousHtml: true
+    }
+  );
+}
+
+module.exports = mdastToHTML;