tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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instn-local-bndng-const.js (1297B)

      1 // |reftest| module
      2 // Copyright (C) 2016 the V8 project authors. All rights reserved.
      3 // This code is governed by the BSD license found in the LICENSE file.
      4 /*---
      5 description: >
      6    Mutable bindings are created in the lexical environment record prior to
      7    execution for `const` declarations
      8 esid: sec-moduledeclarationinstantiation
      9 info: |
     10    [...]
     11    17. For each element d in lexDeclarations do
     12        a. For each element dn of the BoundNames of d do
     13           i. If IsConstantDeclaration of d is true, then
     14              1. Perform ! envRec.CreateImmutableBinding(dn, true).
     15    [...]
     16 includes: [fnGlobalObject.js]
     17 flags: [module]
     18 ---*/
     19 
     20 var global = fnGlobalObject();
     21 
     22 assert.throws(ReferenceError, function() {
     23  typeof test262;
     24 }, 'Binding is created but not initialized.');
     25 assert.sameValue(
     26  Object.getOwnPropertyDescriptor(global, 'test262'), undefined
     27 );
     28 
     29 const test262 = 23;
     30 
     31 assert.sameValue(test262, 23);
     32 assert.sameValue(
     33  Object.getOwnPropertyDescriptor(global, 'test262'), undefined
     34 );
     35 
     36 assert.throws(TypeError, function() {
     37  test262 = null;
     38 });
     39 
     40 assert.sameValue(test262, 23, 'binding is not mutable');
     41 assert.sameValue(
     42  Object.getOwnPropertyDescriptor(global, 'test262'),
     43  undefined,
     44  'global binding is not effected by attempts to modify'
     45 );
     46 
     47 reportCompare(0, 0);