1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
// |reftest| shell-option(--enable-array-from-async) skip-if(!Array.fromAsync||!xulRuntime.shell) async -- Array.fromAsync is not enabled unconditionally, requires shell-options
// Copyright (C) 2023 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-array.fromasync
description: >
The iterator of an asynchronous iterable is closed when the synchronous
mapping function throws.
info: |
3.j.ii.6. If _mapping_ is *true*, then
a. Let _mappedValue_ be Call(_mapfn_, _thisArg_, « _nextValue_, 𝔽(_k_) »).
b. IfAbruptCloseAsyncIterator(_mappedValue_, _iteratorRecord_).
...
flags: [async]
includes: [asyncHelpers.js]
features: [Array.fromAsync]
---*/
let closed = false;
const iterator = {
next() {
return Promise.resolve({ value: 1, done: false });
},
return() {
closed = true;
return Promise.resolve({ done: true });
},
[Symbol.asyncIterator]() {
return this;
}
}
asyncTest(async () => {
await assert.throwsAsync(Error, () => Array.fromAsync(iterator, (val) => {
assert.sameValue(val, 1, "mapfn receives value from iterator");
throw new Error("mapfn throws");
}), "sync mapfn throwing should cause fromAsync to reject");
assert(closed, "sync mapfn throwing should close iterator")
});
|
