// 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. // Copyright 2015 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. var target = {}; var handler = { preventExtensions (target) { throw 42; }}; var proxy = new Proxy(target, handler); try { // 7.3.14 Object.freeze(proxy) assert(false); } catch (e) { assert(e === 42); } try { // 7.3.14 Object.seal(proxy) assert(false); } catch (e) { assert(e === 42); } // test with no trap var target = {}; var handler = {}; var proxy = new Proxy(target, handler); assert(Object.isExtensible(target) === true); assert(Object.isExtensible(proxy) === true); Object.preventExtensions(proxy); assert(Object.isExtensible(target) === false); assert(Object.isExtensible(proxy) === false); // test with "undefined" trap var target = {}; var handler = { preventExtensions: null }; var proxy = new Proxy(target, handler); assert(Object.isExtensible(target) === true); assert(Object.isExtensible(proxy) === true); Object.preventExtensions(proxy); assert(Object.isExtensible(target) === false); assert(Object.isExtensible(proxy) === false); // test with invalid trap var target = {}; var handler = { preventExtensions: 42 }; var proxy = new Proxy(target, handler); try { Object.preventExtensions(proxy); assert(false); } catch (e) { assert(e instanceof TypeError); } // test with valid trap var target = { foo: "bar" }; var handler = { preventExtensions(target) { target.foo = "foo" Object.preventExtensions(target); return true; } } var proxy = new Proxy(target, handler); assert(Object.isExtensible(target) === true); assert(Object.isExtensible(proxy) === true); assert(target.foo === "bar"); Object.preventExtensions(proxy); assert(Object.isExtensible(target) === false); assert(Object.isExtensible(proxy) === false); assert(target.foo === "foo"); // test when invariants gets violated var target = {}; var handler = { preventExtensions(target) { return true; } } var proxy = new Proxy(target, handler); try { Object.preventExtensions(proxy); assert(false); } catch (e) { assert(e instanceof TypeError); } // test when target is proxy var target = {}; var handler = { preventExtensions(target) { Object.preventExtensions(target); return true; } } var proxy1 = new Proxy(target, handler); var proxy2 = new Proxy(proxy1, handler); assert(Object.isExtensible(target) === true); assert(Object.isExtensible(proxy1) === true); assert(Object.isExtensible(proxy2) === true); Object.preventExtensions(proxy2); assert(Object.isExtensible(target) === false); assert(Object.isExtensible(proxy1) === false); assert(Object.isExtensible(proxy2) === false); var target = {}; var handler = { preventExtensions(target) { return true; } } var proxy1 = new Proxy(target, handler); var proxy2 = new Proxy(proxy1, handler); try { Object.preventExtensions(proxy2); assert(false); } catch (e) { assert(e instanceof TypeError); }