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// |reftest| skip-if(!this.hasOwnProperty('AsyncIterator'))
//
/*---
esid: pending
description: Lazy %AsyncIterator.prototype% methods access specified properties only.
info: >
Iterator Helpers proposal 2.1.6
features: [iterator-helpers]
---*/
let log;
const handlerProxy = new Proxy({}, {
get: (target, key, receiver) => (...args) => {
log.push(`${key}: ${args.filter(x => typeof x != 'object').map(x => x.toString())}`);
return Reflect[key](...args);
},
});
class TestIterator extends AsyncIterator {
value = 0;
async next() {
if (this.value < 1)
return new Proxy({done: false, value: this.value++}, handlerProxy);
return new Proxy({done: true, value: undefined}, handlerProxy);
}
}
const methods = [
['map', x => x],
['filter', x => true],
['take', 4],
['drop', 0],
['asIndexedPairs', undefined],
['flatMap', async function*(x) { yield x; }],
];
(async () => {
for (const [method, argument] of methods) {
log = [];
const iteratorProxy = new Proxy(new TestIterator(), handlerProxy);
const iteratorHelper = iteratorProxy[method](argument);
await iteratorHelper.next();
await iteratorHelper.next();
const {done} = await iteratorHelper.next();
assertEq(done, true);
assertEq(
log.join('\n'),
`get: ${method}
get: next
get: value
get: value
set: value,1
getOwnPropertyDescriptor: value
defineProperty: value
get: then
get: done
get: value
get: value
get: then
get: done`
);
}
})();
if (typeof reportCompare == 'function')
reportCompare(0, 0);
|
