| // Copyright (C) 2015 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| es6id: 9.5.5 |
| description: > |
| Throws a TypeError exception if trap result is not configurable but target |
| property descriptor is undefined. |
| info: | |
| [[GetOwnProperty]] (P) |
| |
| ... |
| 2. Let handler be the value of the [[ProxyHandler]] internal slot of O. |
| ... |
| 5. Let target be the value of the [[ProxyTarget]] internal slot of O. |
| 6. Let trap be GetMethod(handler, "getOwnPropertyDescriptor"). |
| ... |
| 9. Let trapResultObj be Call(trap, handler, «target, P»). |
| ... |
| 12. Let targetDesc be target.[[GetOwnProperty]](P). |
| ... |
| 17. Let resultDesc be ToPropertyDescriptor(trapResultObj). |
| ... |
| 22. If resultDesc.[[Configurable]] is false, then |
| a. If targetDesc is undefined or targetDesc.[[Configurable]] is true, then |
| i. Throw a TypeError exception. |
| |
| features: [Proxy] |
| ---*/ |
| |
| var target = {}; |
| |
| var p = new Proxy(target, { |
| getOwnPropertyDescriptor: function(t, prop) { |
| var foo = {}; |
| |
| Object.defineProperty(foo, "bar", { |
| configurable: false, |
| enumerable: true, |
| value: 1 |
| }); |
| |
| return Object.getOwnPropertyDescriptor(foo, prop); |
| } |
| }); |
| |
| assert.throws(TypeError, function() { |
| Object.getOwnPropertyDescriptor(p, "bar"); |
| }); |