Fix webpack HMR

assets/build/util/addHotMiddleware.js

@@ -0,0 +1,21 @@
+const qs = require('qs');
+
+/**
+ * Loop through webpack entry
+ * and add the hot middleware
+ * @param  {Object} entry webpack entry
+ * @return {Object} entry with hot middleware
+ */
+module.exports = (entry) => {
+  const results = {};
+  const hotMiddlewareScript = `webpack-hot-middleware/client?${qs.stringify({
+    timeout: 20000,
+    reload: false,
+  })}`;
+
+  Object.keys(entry).forEach(name => {
+    results[name] = Array.isArray(entry[name]) ? entry[name].slice(0) : [entry[name]];
+    results[name].push(hotMiddlewareScript);
+  });
+  return results;
+};