Source code
Revision control
Copy as Markdown
Other Tools
// |reftest| shell-option(--enable-explicit-resource-management) skip-if(!(this.hasOwnProperty('getBuildConfiguration')&&getBuildConfiguration('explicit-resource-management'))||!xulRuntime.shell) async -- explicit-resource-management is not enabled unconditionally, requires shell-options
// Copyright (C) 2023 Ron Buckton. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-let-and-const-declarations-runtime-semantics-evaluation
description: Throws if initialized value's Symbol.asyncDispose property is undefined and Symbol.dispose is not present
info: |
RS: Evaluation
AwaitUsingDeclaration : CoverAwaitExpressionAndAwaitUsingDeclarationHead BindingList ;
1. Perform ? BindingEvaluation of BindingList with argument async-dispose.
2. Return empty.
RS: BindingEvaluation
LexicalBinding : BindingIdentifier Initializer
...
5. Return ? InitializeReferencedBinding(lhs, value, hint).
InitializeReferencedBinding ( V, W )
...
4. Return ? base.InitializeBinding(V.[[ReferencedName]], W).
InitializeBinding ( N, V, hint )
...
2. If hint is not normal, perform ? AddDisposableResource(envRec.[[DisposeCapability]], V, hint).
...
AddDisposableResource ( disposeCapability, V, hint [, method ] )
1. If method is not present then,
a. If V is either null or undefined and hint is sync-dispose, then
i. Return unused.
b. Let resource be ? CreateDisposableResource(V, hint).
2. Else,
...
3. Append resource to disposeCapability.[[DisposableResourceStack]].
4. Return unused.
CreateDisposableResource ( V, hint [ , method ] )
1. If method is not present, then
a. If V is either null or undefined, then
...
b. Else,
i. If V is not an Object, throw a TypeError exception.
ii. Set method to ? GetDisposeMethod(V, hint).
iii. If method is undefined, throw a TypeError exception.
...
GetDisposeMethod ( V, hint )
1. If hint is async-dispose, then
a. Let method be ? GetMethod(V, @@asyncDispose).
b. If method is undefined, then
i. Set method to ? GetMethod(V, @@dispose).
2. Else,
a. Let method be ? GetMethod(V, @@dispose).
3. Return method.
GetMethod ( V, P )
1. Let func be ? GetV(V, P).
2. If func is either undefined or null, return undefined.
3. ...
flags: [async]
includes: [asyncHelpers.js]
features: [explicit-resource-management]
---*/
asyncTest(async function () {
await assert.throwsAsync(TypeError, async function () {
await using x = { [Symbol.asyncDispose]: undefined };
});
});