Izmjenjena struktura, dodan backand

web/node_modules/core-js/modules/$.set-proto.js

@@ -0,0 +1,26 @@
+// Works with __proto__ only. Old v8 can't work with null proto objects.
+/* eslint-disable no-proto */
+var getDesc  = require('./$').getDesc
+  , isObject = require('./$.is-object')
+  , anObject = require('./$.an-object');
+var check = function(O, proto){
+  anObject(O);
+  if(!isObject(proto) && proto !== null)throw TypeError(proto + ": can't set as prototype!");
+};
+module.exports = {
+  set: Object.setPrototypeOf || ('__proto__' in {} ? // eslint-disable-line
+    function(test, buggy, set){
+      try {
+        set = require('./$.ctx')(Function.call, getDesc(Object.prototype, '__proto__').set, 2);
+        set(test, []);
+        buggy = !(test instanceof Array);
+      } catch(e){ buggy = true; }
+      return function setPrototypeOf(O, proto){
+        check(O, proto);
+        if(buggy)O.__proto__ = proto;
+        else set(O, proto);
+        return O;
+      };
+    }({}, false) : undefined),
+  check: check
+};