The Tor Browser: js/src/jit-test/tests/proxy/testDirectProxyValidateProperty5.js@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 load(libdir + "asserts.js");

     3 /*

     4  * Throw a TypeError if both the current descriptor and the descriptor returned

     5  * by the trap are data descriptors, the current descriptor is non-configurable

     6  * and non-writable, and the descriptor returned by the trap does not have the

     7  * same value.

     8  */

     9 var target = {};

    10 Object.defineProperty(target, 'foo', {

    11     value: 'bar',

    12     writable: false,

    13     configurable: false

    14 });

    15 var caught = false;

    16 assertThrowsInstanceOf(function () {

    17     Object.getOwnPropertyDescriptor(new Proxy(target, {

    18         getOwnPropertyDescriptor: function (target, name) {

    19             return {

    20                 value: 'baz',

    21                 writable: false,

    22                 configurable: false

    23             };

    24         }

    25     }), 'foo');

    26 }, TypeError);

The Tor Browser / file revision