tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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class-definition-null-proto-this.js (1068B)

      1 // Copyright (C) 2014 the V8 project authors. All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 /*---
      4 esid: sec-runtime-semantics-classdefinitionevaluation
      5 description: >
      6  The `this` value of a null-extending class isn't automatically initialized
      7 info: |
      8  Runtime Semantics: ClassDefinitionEvaluation
      9 
     10  [...]
     11  15. If ClassHeritageopt is present, then set F's [[ConstructorKind]] internal slot to "derived".
     12  [...]
     13 
     14  12.2.2.1 Runtime Semantics: Evaluation
     15  PrimaryExpression : this
     16  1. Return ? ResolveThisBinding( ).
     17 
     18  8.3.4 ResolveThisBinding ( )
     19  [...]
     20  2. Return ? envRec.GetThisBinding().
     21  
     22  8.1.1.3.4 GetThisBinding ( )
     23  [...]
     24  3. If envRec.[[ThisBindingStatus]] is "uninitialized", throw a ReferenceError exception.
     25  [...]
     26 ---*/
     27 
     28 class C extends null {
     29  constructor() {
     30    // Use an arrow function to access the `this` binding of the class constructor.
     31    assert.throws(ReferenceError, () => {
     32      this;
     33    });
     34  }
     35 }
     36 
     37 assert.throws(ReferenceError, function() {
     38  new C();
     39 });
     40 
     41 reportCompare(0, 0);