tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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target-is-sealed-property-creation-throws.js (1644B)

      1 // Copyright (C) 2021 Alexey Shvayka. All rights reserved.
      2 // This code is governed by the license found in the LICENSE file.
      3 
      4 /*---
      5 esid: sec-object.assign
      6 description: >
      7  [[Set]] to non-existing property of sealed `target` fails with TypeError.
      8 info: |
      9  SetIntegrityLevel ( O, level )
     10 
     11  [...]
     12  3. Let status be ? O.[[PreventExtensions]]().
     13  [...]
     14 
     15  Object.assign ( target, ...sources )
     16 
     17  [...]
     18  3. For each element nextSource of sources, do
     19    a. If nextSource is neither undefined nor null, then
     20      [...]
     21      iii. For each element nextKey of keys, do
     22        1. Let desc be ? from.[[GetOwnProperty]](nextKey).
     23        2. If desc is not undefined and desc.[[Enumerable]] is true, then
     24          [...]
     25          b. Perform ? Set(to, nextKey, propValue, true).
     26 
     27  OrdinarySetWithOwnDescriptor ( O, P, V, Receiver, ownDesc )
     28 
     29  [...]
     30  3. If IsDataDescriptor(ownDesc) is true, then
     31    [...]
     32    c. Let existingDescriptor be ? Receiver.[[GetOwnProperty]](P).
     33    d. If existingDescriptor is not undefined, then
     34      [...]
     35    e. Else,
     36      i. Assert: Receiver does not currently have a property P.
     37      ii. Return ? CreateDataProperty(Receiver, P, V).
     38 
     39  ValidateAndApplyPropertyDescriptor ( O, P, extensible, Desc, current )
     40 
     41  [...]
     42  2. If current is undefined, then
     43    a. If extensible is false, return false.
     44 features: [Symbol, Reflect]
     45 ---*/
     46 
     47 var target1 = Object.seal({ foo: 1 });
     48 
     49 assert.throws(TypeError, function() {
     50  Object.assign(target1, { get bar() {} });
     51 });
     52 
     53 
     54 var target2 = {};
     55 
     56 Object.seal(target2);
     57 assert.throws(TypeError, function() {
     58  Object.assign(target2, { [Symbol()]: 1 });
     59 });
     60 
     61 reportCompare(0, 0);