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21 lines
574 B
21 lines
574 B
10 years ago
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'use strict';
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var getPrototypeOf = Object.getPrototypeOf, prototype = Object.prototype
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, toString = prototype.toString
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, id = Object().toString();
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module.exports = function (value) {
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var proto, constructor;
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if (!value || (typeof value !== 'object') || (toString.call(value) !== id)) {
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return false;
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}
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proto = getPrototypeOf(value);
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if (proto === null) {
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constructor = value.constructor;
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if (typeof constructor !== 'function') return true;
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return (constructor.prototype !== value);
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}
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return (proto === prototype) || (getPrototypeOf(proto) === null);
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};
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