npm and error messages

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

@@ -0,0 +1,9 @@
+// 19.1.2.6 Object.getOwnPropertyDescriptor(O, P)
+var toIObject = require('./_to-iobject');
+var $getOwnPropertyDescriptor = require('./_object-gopd').f;
+
+require('./_object-sap')('getOwnPropertyDescriptor', function () {
+  return function getOwnPropertyDescriptor(it, key) {
+    return $getOwnPropertyDescriptor(toIObject(it), key);
+  };
+});