tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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private-field-presence-field-shadowed.js (902B)

      1 // Copyright 2021 the V8 project authors.  All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 
      4 /*---
      5 description: Value when private name describes a field
      6 info: |
      7  7. Let privateName be ? GetValue(privateNameBinding).
      8  8. Assert: privateName is a Private Name.
      9  9. If privateName.[[Kind]] is "field",
     10     a. If ! PrivateFieldFind(privateName, rval) is not empty, then return true.
     11  [...]
     12  11. Return false.
     13 esid: sec-relational-operators-runtime-semantics-evaluation
     14 features: [class-fields-private, class-fields-private-in]
     15 ---*/
     16 
     17 let Child;
     18 
     19 class Parent {
     20  #field;
     21 
     22  static init() {
     23    Child = class {
     24      #field;
     25 
     26      static isNameIn(value) {
     27        return #field in value;
     28      }
     29    };
     30  }
     31 }
     32 
     33 Parent.init();
     34 
     35 assert.sameValue(Child.isNameIn(new Parent()), false);
     36 assert.sameValue(Child.isNameIn(new Child()), true);
     37 
     38 reportCompare(0, 0);