tor-browser

The Tor Browser
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proxy-invariant-absent-not-configurable-symbol-key.js (1556B)

      1 // Copyright (C) 2019 Alexey Shvayka. All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 
      4 /*---
      5 esid: sec-object.getownpropertynames
      6 description: >
      7  Proxy [[OwnPropertyKeys]] trap does not skip symbol keys when validating invariant:
      8  * The result List must contain the keys of all non-configurable own properties of
      9    the target object.
     10 info: |
     11  Object.getOwnPropertyNames ( O )
     12 
     13  1. Return ? GetOwnPropertyKeys(O, String).
     14 
     15  GetOwnPropertyKeys ( O, type )
     16 
     17  ...
     18  2. Let keys be ? obj.[[OwnPropertyKeys]]().
     19 
     20  [[OwnPropertyKeys]] ( )
     21 
     22  ...
     23  11. Let targetKeys be ? target.[[OwnPropertyKeys]]().
     24  ...
     25  15. Let targetNonconfigurableKeys be a new empty List.
     26  16. For each element key of targetKeys, do
     27    a. Let desc be ? target.[[GetOwnProperty]](key).
     28    b. If desc is not undefined and desc.[[Configurable]] is false, then
     29      i. Append key as an element of targetNonconfigurableKeys.
     30  ...
     31  18. Let uncheckedResultKeys be a new List which is a copy of trapResult.
     32  19. For each key that is an element of targetNonconfigurableKeys, do
     33    a. If key is not an element of uncheckedResultKeys, throw a TypeError exception.
     34 features: [Proxy, Symbol]
     35 ---*/
     36 
     37 var target = {};
     38 var symbol = Symbol();
     39 Object.defineProperty(target, symbol, {
     40  value: 1,
     41  writable: true,
     42  enumerable: true,
     43  configurable: false,
     44 });
     45 
     46 var proxy = new Proxy(target, {
     47  ownKeys: function() {
     48    return [];
     49  },
     50 });
     51 
     52 assert.throws(TypeError, function() {
     53  Object.getOwnPropertyNames(proxy);
     54 });
     55 
     56 reportCompare(0, 0);