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// Copyright (C) 2015 the V8 project authors. 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-ownpropertykeys
description: >
If target is not extensible, the result can't contain keys names not
contained in the target object.
info: |
[[OwnPropertyKeys]] ( )
...
20. If uncheckedResultKeys is not empty, throw a TypeError exception.
---*/
var target = {
foo: 1
};
var p = new Proxy(target, {
ownKeys: function() {
return ["foo", "bar"];
}
});
Object.preventExtensions(target);
assert.throws(TypeError, function() {
Object.keys(p);
});
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