Apply arrow function transform.

_defineProperty.js

@@ -1,11 +1,11 @@
 import getNative from './_getNative.js';
 
-var defineProperty = (function() {
+var defineProperty = ((() => {
   try {
     var func = getNative(Object, 'defineProperty');
     func({}, '', {});
     return func;
   } catch (e) {}
-}());
+})());
 
 export default defineProperty;