feat(riot-v5): create the skeleton for riot5

rollup/html-useref.js

@@ -0,0 +1,21 @@
+import fs from 'fs';
+
+const useref = /<!--\s*build:([a-z]+) ([-a-zA-Z./]+)\s*-->.*?<!--\s*endbuild\s*-->/;
+
+const generateBalise = (type, output) => {
+  switch(type) {
+    case 'css':
+      return `<link href="${output}" rel="stylesheet" type="text/css">`;
+    case 'js':
+      return `<script src="${output}"></script>`
+  }
+}
+
+export default function(src) {
+  let html = fs.readFileSync(src).toString().replace(/>\n+\s*/g, '>');
+  while (useref.test(html)) {
+    const [ raw, type, output ] = useref.exec(html);
+    html = html.replace(raw, generateBalise(type, output)); 
+  }
+  return html;
+}