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