tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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unscopables-with.js (2561B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/function-forms/unscopables-with.case
      3 // - src/function-forms/default/arrow-function.template
      4 /*---
      5 description: Symbol.unscopables behavior across scope boundaries (arrow function expression)
      6 esid: sec-arrow-function-definitions-runtime-semantics-evaluation
      7 features: [globalThis, Symbol.unscopables]
      8 flags: [generated, noStrict]
      9 info: |
     10    ArrowFunction : ArrowParameters => ConciseBody
     11 
     12    [...]
     13    4. Let closure be FunctionCreate(Arrow, parameters, ConciseBody, scope, strict).
     14    [...]
     15 
     16    9.2.1 [[Call]] ( thisArgument, argumentsList)
     17 
     18    [...]
     19    7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
     20    [...]
     21 
     22    9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
     23 
     24    1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
     25    [...]
     26 
     27    9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
     28 
     29    [...]
     30    23. Let iteratorRecord be Record {[[iterator]]:
     31        CreateListIterator(argumentsList), [[done]]: false}.
     32    24. If hasDuplicates is true, then
     33        [...]
     34    25. Else,
     35        b. Let formalStatus be IteratorBindingInitialization for formals with
     36           iteratorRecord and env as arguments.
     37    [...]
     38 
     39    ...
     40    Let envRec be lex's EnvironmentRecord.
     41    Let exists be ? envRec.HasBinding(name).
     42 
     43    HasBinding
     44 
     45    ...
     46    If the withEnvironment flag of envRec is false, return true.
     47    Let unscopables be ? Get(bindings, @@unscopables).
     48    If Type(unscopables) is Object, then
     49       Let blocked be ToBoolean(? Get(unscopables, N)).
     50       If blocked is true, return false.
     51 
     52    (The `with` Statement) Runtime Semantics: Evaluation
     53 
     54    ...
     55    Set the withEnvironment flag of newEnv’s EnvironmentRecord to true.
     56    ...
     57 
     58 ---*/
     59 let count = 0;
     60 var v = 1;
     61 globalThis[Symbol.unscopables] = {
     62  v: true,
     63 };
     64 
     65 {
     66  count++;
     67 
     68 var callCount = 0;
     69 // Stores a reference `ref` for case evaluation
     70 var ref;
     71 ref = (x) => {
     72  count++;
     73  with (globalThis) {
     74    count++;
     75    assert.sameValue(v, undefined, 'The value of `v` is expected to equal `undefined`');
     76  }
     77  count++;
     78  var v = x;
     79  with (globalThis) {
     80    count++;
     81    assert.sameValue(v, 10, 'The value of `v` is 10');
     82    v = 20;
     83  }
     84  assert.sameValue(v, 20, 'The value of `v` is 20');
     85  assert.sameValue(globalThis.v, 1, 'The value of globalThis.v is 1');
     86  callCount = callCount + 1;
     87 };
     88 
     89 ref(10);
     90 assert.sameValue(callCount, 1, 'arrow function invoked exactly once');
     91 
     92  count++;
     93 }
     94 assert.sameValue(count, 6, 'The value of `count` is 6');
     95 
     96 reportCompare(0, 0);