1 // Works with __proto__ only. Old v8 can't work with null proto objects.
2 /* eslint-disable no-proto */
3 var isObject = require('./_is-object')
4 , anObject = require('./_an-object');
5 var check = function(O, proto){
7 if(!isObject(proto) && proto !== null)throw TypeError(proto + ": can't set as prototype!");
10 set: Object.setPrototypeOf || ('__proto__' in {} ? // eslint-disable-line
11 function(test, buggy, set){
13 set = require('./_ctx')(Function.call, require('./_object-gopd').f(Object.prototype, '__proto__').set, 2);
15 buggy = !(test instanceof Array);
16 } catch(e){ buggy = true; }
17 return function setPrototypeOf(O, proto){
19 if(buggy)O.__proto__ = proto;
23 }({}, false) : undefined),