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// |reftest| skip-if(!this.hasOwnProperty('AsyncIterator'))
//
//
/*---
esid: pending
description: Lazy %AsyncIterator.prototype% methods close the iterator if `yield` throws.
info: >
AsyncIterator Helpers proposal 2.1.6
features: [iterator-helpers]
---*/
class TestError extends Error {}
class TestAsyncIterator extends AsyncIterator {
async next() {
return {done: false, value: 1};
}
closed = false;
async return(value) {
this.closed = true;
return {done: true, value};
}
}
async function* gen(x) { yield x; }
const methods = [
iter => iter.map(x => x),
iter => iter.filter(x => true),
iter => iter.take(1),
iter => iter.drop(0),
iter => iter.asIndexedPairs(),
iter => iter.flatMap(gen),
];
for (const method of methods) {
const iterator = new TestAsyncIterator();
const iteratorHelper = method(iterator);
assertEq(iterator.closed, false);
iteratorHelper.next().then(
_ => iteratorHelper.throw(new TestError()).then(
_ => assertEq(true, false, 'Expected reject'),
err => {
assertEq(err instanceof TestError, true);
assertEq(iterator.closed, true);
},
),
);
}
if (typeof reportCompare == 'function')
reportCompare(0, 0);
|
