Express addition

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

@@ -0,0 +1,13 @@
+// 19.1.2.9 / 15.2.3.2 Object.getPrototypeOf(O)
+var has = require('./_has');
+var toObject = require('./_to-object');
+var IE_PROTO = require('./_shared-key')('IE_PROTO');
+var ObjectProto = Object.prototype;
+
+module.exports = Object.getPrototypeOf || function (O) {
+  O = toObject(O);
+  if (has(O, IE_PROTO)) return O[IE_PROTO];
+  if (typeof O.constructor == 'function' && O instanceof O.constructor) {
+    return O.constructor.prototype;
+  } return O instanceof Object ? ObjectProto : null;
+};