// Copyright JS Foundation and other contributors, http://js.foundation // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. var obj = { "foo": 5 }; assert(Object.hasOwn(obj, "foo") == true); assert(Object.hasOwn(obj, "bar") == false); const handler1 = {}; const handler2 = { getOwnPropertyDescriptor(target, prop, receiver) { return { configurable: true, enumerable: true, value: true }; } }; const handler3 = { getOwnPropertyDescriptor(target, prop, receiver) { } }; const proxy1 = new Proxy(obj, handler1); const proxy2 = new Proxy(obj, handler2); const proxy3 = new Proxy(obj, handler3); assert(Object.hasOwn(proxy1, "foo") == true); assert(Object.hasOwn(proxy1, "bar") == false); assert(Object.hasOwn(proxy2, "foo") == true); assert(Object.hasOwn(proxy2, "bar") == true); assert(Object.hasOwn(proxy3, "foo") == false); assert(Object.hasOwn(proxy3, "bar") == false); try { Object.hasOwn({}, { get toString() { throw "foo" } }); } catch (e) { assert(e === "foo"); } try { Object.hasOwn(undefined); assert(false); } catch (e) { assert(e instanceof TypeError); }