| // Copyright (C) 2020 Alexey Shvayka. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| esid: sec-proxy-object-internal-methods-and-internal-slots-defineownproperty-p-desc |
| description: > |
| If "defineProperty" trap is null or undefined, [[DefineOwnProperty]] call |
| is properly forwarded to [[ProxyTarget]] (which is also a Proxy object). |
| info: | |
| [[DefineOwnProperty]] (P, Desc) |
| |
| [...] |
| 5. Let target be O.[[ProxyTarget]]. |
| 6. Let trap be ? GetMethod(handler, "defineProperty"). |
| 7. If trap is undefined, then |
| a. Return ? target.[[DefineOwnProperty]](P, Desc). |
| features: [Proxy, Reflect] |
| includes: [propertyHelper.js] |
| ---*/ |
| |
| var plainObject = Object.create(null); |
| Object.defineProperty(plainObject, "foo", { |
| configurable: false, |
| }); |
| |
| var plainObjectTarget = new Proxy(plainObject, {}); |
| var plainObjectProxy = new Proxy(plainObjectTarget, { |
| defineProperty: null, |
| }); |
| |
| assert.throws(TypeError, function() { |
| Object.defineProperty(plainObjectProxy, "foo", { |
| configurable: true, |
| }); |
| }); |
| |
| Object.defineProperty(plainObjectProxy, "bar", { |
| get: function() { |
| return 2; |
| }, |
| }); |
| assert.sameValue(plainObject.bar, 2); |
| |
| |
| var regExp = /(?:)/g; |
| var regExpTarget = new Proxy(regExp, {}); |
| var regExpProxy = new Proxy(regExpTarget, { |
| defineProperty: null, |
| }); |
| |
| assert( |
| Reflect.defineProperty(regExpProxy, "lastIndex", { |
| writable: false, |
| }) |
| ); |
| |
| verifyNotWritable(regExp, "lastIndex"); |