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30 lines
692 B
JavaScript
30 lines
692 B
JavaScript
// Copyright (C) 2015 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-proxy-object-internal-methods-and-internal-slots-ownpropertykeys
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description: >
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If target is not extensible, the result can't contain keys names not
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contained in the target object.
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info: |
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[[OwnPropertyKeys]] ( )
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...
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20. If uncheckedResultKeys is not empty, throw a TypeError exception.
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---*/
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var target = {
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foo: 1
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};
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var p = new Proxy(target, {
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ownKeys: function() {
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return ["foo", "bar"];
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}
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});
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Object.preventExtensions(target);
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assert.throws(TypeError, function() {
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Object.keys(p);
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});
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