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node_modules/core-js/modules/es.function.has-instance.js

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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 getPrototypeOf = require('../internals/object-get-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;
+    if (!isObject(P)) return O instanceof this;
+    // for environment w/o native `@@hasInstance` logic enough `instanceof`, but add this:
+    while (O = getPrototypeOf(O)) if (P === O) return true;
+    return false;
+  }, HAS_INSTANCE) });
+}