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17 lines
693 B
17 lines
693 B
var isObject = require('../internals/is-object'); |
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var setPrototypeOf = require('../internals/object-set-prototype-of'); |
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// makes subclassing work correct for wrapped built-ins |
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module.exports = function ($this, dummy, Wrapper) { |
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var NewTarget, NewTargetPrototype; |
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if ( |
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// it can work only with native `setPrototypeOf` |
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setPrototypeOf && |
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// we haven't completely correct pre-ES6 way for getting `new.target`, so use this |
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typeof (NewTarget = dummy.constructor) == 'function' && |
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NewTarget !== Wrapper && |
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isObject(NewTargetPrototype = NewTarget.prototype) && |
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NewTargetPrototype !== Wrapper.prototype |
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) setPrototypeOf($this, NewTargetPrototype); |
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return $this; |
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};
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