Apply arrow function transform.

_nodeUtil.js

@@ -13,10 +13,10 @@ var moduleExports = freeModule && freeModule.exports === freeExports;
 var freeProcess = moduleExports && freeGlobal.process;
 
 /** Used to access faster Node.js helpers. */
-var nodeUtil = (function() {
+var nodeUtil = ((() => {
   try {
     return freeProcess && freeProcess.binding && freeProcess.binding('util');
   } catch (e) {}
-}());
+})());
 
 export default nodeUtil;