| // 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. |
| |
| // Flags: --harmony-proxies |
| |
| var target = { |
| target: 1 |
| }; |
| target.__proto__ = { |
| target_proto: 2 |
| }; |
| |
| var handler = { |
| ownKeys: function(target) { |
| return ["foo", "bar", Symbol("baz"), "non-enum", "not-found"]; |
| }, |
| getOwnPropertyDescriptor: function(target, name) { |
| if (name == "non-enum") return {configurable: true}; |
| if (name == "not-found") return undefined; |
| return {enumerable: true, configurable: true}; |
| } |
| } |
| |
| var proxy = new Proxy(target, handler); |
| |
| // Object.keys() ignores symbols and non-enumerable keys. |
| assertEquals(["foo", "bar"], Object.keys(proxy)); |
| |
| // Edge case: no properties left after filtering. |
| handler.getOwnPropertyDescriptor = undefined; |
| assertEquals([], Object.keys(proxy)); |
| |
| // Throwing shouldn't crash. |
| handler.getOwnPropertyDescriptor = function() { throw new Number(1); }; |
| assertThrows("Object.keys(proxy)", Number); |
| |
| // Fall through to target if there is no trap. |
| handler.ownKeys = undefined; |
| assertEquals(["target"], Object.keys(proxy)); |
| assertEquals(["target"], Object.keys(target)); |