tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
Log | Files | Refs | README | LICENSE

trap-is-null-target-is-proxy.js (900B)

      1 // Copyright (C) 2020 Alexey Shvayka. All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 
      4 /*---
      5 esid: sec-proxy-object-internal-methods-and-internal-slots-preventextensions
      6 description: >
      7  If "preventExtensions" trap is null or undefined, [[PreventExtensions]] call
      8  is properly forwarded to [[ProxyTarget]] (which is also a Proxy object).
      9 info: |
     10  [[PreventExtensions]] ( )
     11 
     12  [...]
     13  4. Let target be O.[[ProxyTarget]].
     14  5. Let trap be ? GetMethod(handler, "preventExtensions").
     15  6. If trap is undefined, then
     16    a. Return ? target.[[PreventExtensions]]().
     17 features: [Proxy]
     18 ---*/
     19 
     20 var plainObject = {};
     21 var plainObjectTarget = new Proxy(plainObject, {});
     22 var plainObjectProxy = new Proxy(plainObjectTarget, {
     23  preventExtensions: null,
     24 });
     25 
     26 Object.preventExtensions(plainObjectProxy);
     27 assert(!Object.isExtensible(plainObject));
     28 
     29 reportCompare(0, 0);