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24 lines
859 B
24 lines
859 B
var anObject = require('../internals/an-object');
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var aPossiblePrototype = require('../internals/a-possible-prototype');
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// `Object.setPrototypeOf` method
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// https://tc39.github.io/ecma262/#sec-object.setprototypeof
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// Works with __proto__ only. Old v8 can't work with null proto objects.
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/* eslint-disable no-proto */
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module.exports = Object.setPrototypeOf || ('__proto__' in {} ? function () {
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var CORRECT_SETTER = false;
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var test = {};
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var setter;
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try {
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setter = Object.getOwnPropertyDescriptor(Object.prototype, '__proto__').set;
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setter.call(test, []);
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CORRECT_SETTER = test instanceof Array;
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} catch (error) { /* empty */ }
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return function setPrototypeOf(O, proto) {
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anObject(O);
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aPossiblePrototype(proto);
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if (CORRECT_SETTER) setter.call(O, proto);
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else O.__proto__ = proto;
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return O;
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};
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}() : undefined);
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