tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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private-field-rhs-await-absent.js (972B)

      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: Parsing observes the `Await` production parameter when absent
      6 info: |
      7  Syntax
      8    RelationalExpression[In, Yield, Await]:
      9    [...]
     10    [+In]PrivateIdentifier in ShiftExpression[?Yield, ?Await]
     11 
     12  [...]
     13 
     14  1. Let privateIdentifier be the StringValue of PrivateIdentifier.
     15  2. Let rref be the result of evaluating ShiftExpression.
     16  3. Let rval be ? GetValue(rref).
     17  4. If Type(rval) is not Object, throw a TypeError exception.
     18 esid: sec-relational-operators-runtime-semantics-evaluation
     19 features: [class-fields-private, class-fields-private-in]
     20 ---*/
     21 
     22 let value;
     23 function await() {
     24  return value;
     25 }
     26 
     27 class C {
     28  #field;
     29 
     30  static isNameIn() {
     31    return #field in await(null);
     32  }
     33 }
     34 
     35 value = new C();
     36 assert.sameValue(C.isNameIn(), true);
     37 
     38 value = {};
     39 assert.sameValue(C.isNameIn(), false);
     40 
     41 reportCompare(0, 0);