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21 lines
905 B
21 lines
905 B
4 weeks ago
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'use strict';
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var isCallable = require('../internals/is-callable');
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var isObject = require('../internals/is-object');
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var definePropertyModule = require('../internals/object-define-property');
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var isPrototypeOf = require('../internals/object-is-prototype-of');
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var wellKnownSymbol = require('../internals/well-known-symbol');
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var makeBuiltIn = require('../internals/make-built-in');
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var HAS_INSTANCE = wellKnownSymbol('hasInstance');
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var FunctionPrototype = Function.prototype;
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// `Function.prototype[@@hasInstance]` method
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// https://tc39.es/ecma262/#sec-function.prototype-@@hasinstance
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if (!(HAS_INSTANCE in FunctionPrototype)) {
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definePropertyModule.f(FunctionPrototype, HAS_INSTANCE, { value: makeBuiltIn(function (O) {
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if (!isCallable(this) || !isObject(O)) return false;
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var P = this.prototype;
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return isObject(P) ? isPrototypeOf(P, O) : O instanceof this;
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}, HAS_INSTANCE) });
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}
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