diff --git a/src/util/index.js b/src/util.js
similarity index 69%
rename from src/util/index.js
rename to src/util.js
index c717010..eae0a80 100644
--- a/src/util/index.js
+++ b/src/util.js
@@ -1,4 +1,6 @@
 export function deferAction(action) {
+  // Hidding setImmediate from Webpack to avoid inserting polyfill
+  const setImmediate = window.setImmediate;
   if (typeof setImmediate !== 'undefined') {
     setImmediate(action);
   } else {
diff --git a/src/util/.babelrc b/src/util/.babelrc
deleted file mode 100644
index d27153a..0000000
--- a/src/util/.babelrc
+++ /dev/null
@@ -1,25 +0,0 @@
-{
-  "env": {
-    "cjs": {
-      "presets": [
-        "@babel/preset-env",
-        "@babel/preset-react"
-      ],
-      "plugins": [
-      ]
-    },
-    "es2015": {
-      "presets": [
-        [
-          "@babel/preset-env",
-          {
-            "modules": false
-          }
-        ],
-        "@babel/preset-react"
-      ],
-      "plugins": [
-      ]
-    }
-  }
-}