tor-browser

The Tor Browser
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targetdesc-not-configurable-writable-desc-not-writable.js (1188B)

      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-defineownproperty-p-desc
      5 description: >
      6    Throw a TypeError exception if trap result is true, targetDesc is not configurable
      7    and writable, while Desc is not writable.
      8 info: |
      9    [[DefineOwnProperty]] (P, Desc)
     10 
     11    ...
     12    16. Else targetDesc is not undefined,
     13        ...
     14        c. If IsDataDescriptor(targetDesc) is true, targetDesc.[[Configurable]] is
     15        false, and targetDesc.[[Writable]] is true, then
     16            i. If Desc has a [[Writable]] field and Desc.[[Writable]] is
     17            false, throw a TypeError exception.
     18    ...
     19 features: [Proxy, Reflect, proxy-missing-checks]
     20 ---*/
     21 
     22 var trapCalls = 0;
     23 var p = new Proxy({}, {
     24  defineProperty: function(t, prop, desc) {
     25    Object.defineProperty(t, prop, {
     26      configurable: false,
     27      writable: true,
     28    });
     29 
     30    trapCalls++;
     31    return true;
     32  },
     33 });
     34 
     35 assert.throws(TypeError, function() {
     36  Reflect.defineProperty(p, "prop", {
     37    writable: false,
     38  });
     39 });
     40 assert.sameValue(trapCalls, 1);
     41 
     42 reportCompare(0, 0);