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Last change
on this file since ceaed42 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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initial commit
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File size:
693 bytes
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| 1 | var isObject = require('../internals/is-object');
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| 2 | var setPrototypeOf = require('../internals/object-set-prototype-of');
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| 3 |
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| 4 | // makes subclassing work correct for wrapped built-ins
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| 5 | module.exports = function ($this, dummy, Wrapper) {
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| 6 | var NewTarget, NewTargetPrototype;
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| 7 | if (
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| 8 | // it can work only with native `setPrototypeOf`
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| 9 | setPrototypeOf &&
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| 10 | // we haven't completely correct pre-ES6 way for getting `new.target`, so use this
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| 11 | typeof (NewTarget = dummy.constructor) == 'function' &&
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| 12 | NewTarget !== Wrapper &&
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| 13 | isObject(NewTargetPrototype = NewTarget.prototype) &&
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| 14 | NewTargetPrototype !== Wrapper.prototype
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| 15 | ) setPrototypeOf($this, NewTargetPrototype);
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| 16 | return $this;
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| 17 | };
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