Strict mode Failing
Expected no error, got SyntaxError: async generators are unsupported
non-Strict mode Failing
Expected no error, got SyntaxError: async generators are unsupported
Features:
- async-iteration
Expected no error, got SyntaxError: async generators are unsupported
Expected no error, got SyntaxError: async generators are unsupported
// Copyright (C) 2020 Alexey Shvayka. 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 `null`, a Promise rejected with provided value is returned. info: | %AsyncFromSyncIteratorPrototype%.throw ( value ) [...] 6. Let throw be GetMethod(syncIterator, "throw"). [...] 8. If throw is undefined, then ... g. Perform ! Call(promiseCapability.[[Reject]], undefined, « a newly created TypeError object »). h. Return promiseCapability.[[Promise]]. GetMethod ( V, P ) [...] 2. Let func be ? GetV(V, P). 3. If func is either undefined or null, return undefined. flags: [async] features: [async-iteration] includes: [asyncHelpers.js] ---*/ var throwGets = 0; var syncIterator = { [Symbol.iterator]() { return this; }, next() { return {value: 1, done: false}; }, get throw() { throwGets += 1; return null; }, }; async function* asyncGenerator() { yield* syncIterator; } var asyncIterator = asyncGenerator(); var thrownError = { name: "err" }; asyncTest(async function () { await assert.throwsAsync(TypeError, async () => { await asyncIterator.next(); return asyncIterator.throw(thrownError); }, "Promise should be rejected"); const result = await asyncIterator.next(); assert(result.done, "the iterator is completed"); assert.sameValue(result.value, undefined, "value is undefined"); })