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// |reftest| async
// Copyright (C) 2023 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-%asyncfromsynciteratorprototype%.throw
description: >
If syncIterator's "throw" method is `undefined`,
and its "return" method returns `undefined`,
the iterator will close returning the `undefined` value,
which will be ignored and instead a rejected Promise with a new TypeError is returned.
info: |
%AsyncFromSyncIteratorPrototype%.throw ( value )
...
2. Let promiseCapability be ! NewPromiseCapability(%Promise%).
...
5. Let return be GetMethod(syncIterator, "throw").
6. IfAbruptRejectPromise(throw, promiseCapability).
7. If throw is undefined, then
a. NOTE: If syncIterator does not have a throw method, close it to give it a chance to clean up before we reject the capability.
b. Let closeCompletion be Completion { [[Type]]: normal, [[Value]]: empty, [[Target]]: empty }.
c. Set result to IteratorClose(syncIteratorRecord, closeCompletion).
d. IfAbruptRejectPromise(result, promiseCapability).
...
IteratorClose ( iterator, completion )
...
2. Let iterator be iteratorRecord.[[Iterator]].
3. Let innerResult be Completion(GetMethod(iterator, "return")).
4. If innerResult.[[Type]] is normal, then
a. Let return be innerResult.[[Value]].
...
c. Set innerResult to Completion(Call(return, iterator)).
...
7. If innerResult.[[Value]] is not an Object, throw a TypeError exception.
...
IfAbruptRejectPromise ( value, capability )
1. Assert: value is a Completion Record.
2. If value is an abrupt completion, then
a. Perform ? Call(capability.[[Reject]], undefined, « value.[[Value]] »).
b. Return capability.[[Promise]].
...
flags: [async]
features: [async-iteration]
includes: [asyncHelpers.js]
---*/
var returnCount = 0;
const obj = {
[Symbol.iterator]() {
return {
next() {
return {value: 1, done: false};
},
return() {
returnCount += 1;
return 2;
}
};
}
};
async function* wrapper() {
yield* obj;
}
var iter = wrapper();
asyncTest(async function () {
await assert.throwsAsync(TypeError, async () => {
await iter.next();
return iter.throw();
}, "Promise should be rejected");
assert.sameValue(returnCount, 1, 'iterator closed properly');
const result = await iter.next();
assert(result.done, "the iterator is completed");
assert.sameValue(result.value, undefined, "value is undefined");
})
|
