1 var isObject = require('../internals/is-object');
2 var setPrototypeOf = require('../internals/object-set-prototype-of');
4 // makes subclassing work correct for wrapped built-ins
5 module.exports = function ($this, dummy, Wrapper) {
6 var NewTarget, NewTargetPrototype;
8 // it can work only with native `setPrototypeOf`
10 // we haven't completely correct pre-ES6 way for getting `new.target`, so use this
11 typeof (NewTarget = dummy.constructor) == 'function' &&
12 NewTarget !== Wrapper &&
13 isObject(NewTargetPrototype = NewTarget.prototype) &&
14 NewTargetPrototype !== Wrapper.prototype
15 ) setPrototypeOf($this, NewTargetPrototype);