mirror of https://github.com/jkjoy/sunpeiwen.git
26 lines
906 B
JavaScript
26 lines
906 B
JavaScript
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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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var isObject = require('./_is-object');
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var anObject = require('./_an-object');
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var check = function (O, proto) {
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anObject(O);
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if (!isObject(proto) && proto !== null) throw TypeError(proto + ": can't set as prototype!");
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};
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module.exports = {
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set: Object.setPrototypeOf || ('__proto__' in {} ? // eslint-disable-line
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function (test, buggy, set) {
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try {
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set = require('./_ctx')(Function.call, require('./_object-gopd').f(Object.prototype, '__proto__').set, 2);
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set(test, []);
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buggy = !(test instanceof Array);
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} catch (e) { buggy = true; }
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return function setPrototypeOf(O, proto) {
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check(O, proto);
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if (buggy) O.__proto__ = proto;
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else set(O, proto);
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return O;
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};
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}({}, false) : undefined),
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check: check
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};
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