So siehts ganz gut aus !

node_modules/core-js/modules/_object-define.js

@@ -0,0 +1,13 @@
+var dP = require('./_object-dp');
+var gOPD = require('./_object-gopd');
+var ownKeys = require('./_own-keys');
+var toIObject = require('./_to-iobject');
+
+module.exports = function define(target, mixin) {
+  var keys = ownKeys(toIObject(mixin));
+  var length = keys.length;
+  var i = 0;
+  var key;
+  while (length > i) dP.f(target, key = keys[i++], gOPD.f(mixin, key));
+  return target;
+};