So siehts ganz gut aus !

node_modules/core-js/modules/es6.reflect.get-own-property-descriptor.js

@@ -0,0 +1,10 @@
+// 26.1.7 Reflect.getOwnPropertyDescriptor(target, propertyKey)
+var gOPD = require('./_object-gopd');
+var $export = require('./_export');
+var anObject = require('./_an-object');
+
+$export($export.S, 'Reflect', {
+  getOwnPropertyDescriptor: function getOwnPropertyDescriptor(target, propertyKey) {
+    return gOPD.f(anObject(target), propertyKey);
+  }
+});