tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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targetdesc-is-configurable-target-is-not-extensible.js (942B)

      1 // Copyright (C) 2019 Aleksey Shvayka. All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 /*---
      4 esid: sec-proxy-object-internal-methods-and-internal-slots-delete-p
      5 description: >
      6    Throw a TypeError exception if trap result is true, targetDesc is configurable,
      7    and target is not extensible.
      8 info: |
      9    [[Delete]] (P)
     10 
     11    ...
     12    13. Let extensibleTarget be ? IsExtensible(target).
     13    14. If extensibleTarget is false, throw a TypeError exception.
     14    ...
     15 features: [Proxy, Reflect, proxy-missing-checks]
     16 ---*/
     17 
     18 var trapCalls = 0;
     19 var p = new Proxy({prop: 1}, {
     20  deleteProperty: function(t, prop) {
     21    Object.preventExtensions(t);
     22    trapCalls++;
     23    return true;
     24  },
     25 });
     26 
     27 assert.throws(TypeError, function() {
     28  Reflect.deleteProperty(p, "prop");
     29 });
     30 assert.sameValue(trapCalls, 1);
     31 
     32 assert(Reflect.deleteProperty(p, "nonExistent"));
     33 assert.sameValue(trapCalls, 2);
     34 
     35 reportCompare(0, 0);