tor-browser

The Tor Browser
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target-property-is-not-configurable-not-writable-not-equal-to-v.js (1033B)

      1 // Copyright (C) 2015 the V8 project authors. All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 /*---
      4 es6id: 9.5.9
      5 description: >
      6    [[Set]] ( P, V, Receiver)
      7 
      8    Throws a TypeError when target property is not configurable neither writable
      9    and its value is not strictly equal to V.
     10 info: |
     11    14. If targetDesc is not undefined, then
     12        a. If IsDataDescriptor(targetDesc) and targetDesc.[[Configurable]] is
     13        false and targetDesc.[[Writable]] is false, then
     14            i. If SameValue(V, targetDesc.[[Value]]) is false, throw a TypeError
     15            exception.
     16 features: [Proxy]
     17 ---*/
     18 
     19 var target = {};
     20 var handler = {
     21  set: function(t, prop, value, receiver) {
     22    return true;
     23  }
     24 };
     25 var p = new Proxy(target, handler);
     26 
     27 Object.defineProperty(target, 'attr', {
     28  configurable: false,
     29  writable: false,
     30  value: 'foo'
     31 });
     32 
     33 assert.throws(TypeError, function() {
     34  p.attr = 'bar';
     35 });
     36 
     37 assert.throws(TypeError, function() {
     38  p['attr'] = 'bar';
     39 });
     40 
     41 reportCompare(0, 0);