Source code
Revision control
Copy as Markdown
Other Tools
// |reftest| async
// This file was procedurally generated from the following sources:
// - src/function-forms/dflt-params-trailing-comma.case
// - src/function-forms/default/cls-decl-async-meth.template
/*---
description: A trailing comma should not increase the respective length, using default parameters (class declaration async method)
esid: sec-class-definitions-runtime-semantics-evaluation
features: [async-functions]
flags: [generated, async]
info: |
ClassDeclaration : class BindingIdentifier ClassTail
1. Let className be StringValue of BindingIdentifier.
2. Let value be the result of ClassDefinitionEvaluation of ClassTail with
argument className.
[...]
14.5.14 Runtime Semantics: ClassDefinitionEvaluation
21. For each ClassElement m in order from methods
a. If IsStatic of m is false, then
i. Let status be the result of performing
PropertyDefinitionEvaluation for m with arguments proto and
false.
[...]
Runtime Semantics: PropertyDefinitionEvaluation
AsyncMethod : async PropertyName ( UniqueFormalParameters ) { AsyncFunctionBody }
1. Let propKey be the result of evaluating PropertyName.
2. ReturnIfAbrupt(propKey).
3. If the function code for this AsyncMethod is strict mode code, let strict be true. Otherwise
let strict be false.
4. Let scope be the LexicalEnvironment of the running execution context.
5. Let closure be ! AsyncFunctionCreate(Method, UniqueFormalParameters, AsyncFunctionBody,
scope, strict).
[...]
Trailing comma in the parameters list
14.1 Function Definitions
FormalParameters[Yield, Await] : FormalParameterList[?Yield, ?Await] ,
---*/
var callCount = 0;
class C {
async method(a, b = 39,) {
assert.sameValue(a, 42);
assert.sameValue(b, 39);
callCount = callCount + 1;
}
}
// Stores a reference `ref` for case evaluation
var ref = C.prototype.method;
ref(42, undefined, 1).then(() => {
assert.sameValue(callCount, 1, 'method invoked exactly once');
}).then($DONE, $DONE);
assert.sameValue(ref.length, 1, 'length is properly set');