mirror of https://github.com/tc39/test262.git
32 lines
877 B
JavaScript
32 lines
877 B
JavaScript
// Copyright (C) 2020 Alexey Shvayka. 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-isextensible
|
|
description: >
|
|
If "isExtensible" trap is null or undefined, [[IsExtensible]] call is
|
|
properly forwarded to [[ProxyTarget]] (which is also a Proxy object).
|
|
info: |
|
|
[[IsExtensible]] ( )
|
|
|
|
[...]
|
|
4. Let target be O.[[ProxyTarget]].
|
|
5. Let trap be ? GetMethod(handler, "isExtensible").
|
|
6. If trap is undefined, then
|
|
a. Return ? IsExtensible(target).
|
|
|
|
IsExtensible ( O )
|
|
|
|
1. Assert: Type(O) is Object.
|
|
2. Return ? O.[[IsExtensible]]().
|
|
features: [Proxy]
|
|
---*/
|
|
|
|
var regExp = /(?:)/g;
|
|
Object.preventExtensions(regExp);
|
|
|
|
var regExpTarget = new Proxy(regExp, {});
|
|
var regExpProxy = new Proxy(regExpTarget, {});
|
|
|
|
assert(!Object.isExtensible(regExpProxy));
|