40 lines
1.1 KiB
JavaScript
40 lines
1.1 KiB
JavaScript
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// Copyright 2015 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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var target = {
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target: 1
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};
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target.__proto__ = {
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target_proto: 2
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};
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var handler = {
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ownKeys: function(target) {
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return ["foo", "bar", Symbol("baz"), "non-enum", "not-found"];
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},
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getOwnPropertyDescriptor: function(target, name) {
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if (name == "non-enum") return {configurable: true};
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if (name == "not-found") return undefined;
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return {enumerable: true, configurable: true};
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}
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}
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var proxy = new Proxy(target, handler);
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// Object.keys() ignores symbols and non-enumerable keys.
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assertEquals(["foo", "bar"], Object.keys(proxy));
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// Edge case: no properties left after filtering.
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handler.getOwnPropertyDescriptor = undefined;
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assertEquals([], Object.keys(proxy));
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// Throwing shouldn't crash.
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handler.getOwnPropertyDescriptor = function() { throw new Number(1); };
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assertThrows("Object.keys(proxy)", Number);
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// Fall through to target if there is no trap.
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handler.ownKeys = undefined;
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assertEquals(["target"], Object.keys(proxy));
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assertEquals(["target"], Object.keys(target));
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