ac6ed35a31
Per https://github.com/tc39/proposal-async-iteration/pull/102/files: AsyncGeneratorResolve no longer unwraps a value component. Instead, the value is unwrapped before the builtin call via Await, allowing Promise rejections to affect the generator control flow. Thus, all `yield <expr>` implicitly become `yield await <expr>`. Additionally, `return <expr>` becomes `return await <expr>`. Finally, when the generator is resumed with `.return()`, the parameter passed to .return() is awaited before generator execution properly continues). BUG=v8:6187, v8:5855 R=littledan@chromium.org, neis@chromium.org, adamk@chromium.org TBR=rmcilroy@chromium.org, neis@chromium.org Cq-Include-Trybots: master.tryserver.v8:v8_linux_noi18n_rel_ng Change-Id: Id7718028fd555481f9f4ca0dbecfa788e3057c48 Reviewed-on: https://chromium-review.googlesource.com/594500 Reviewed-by: Caitlin Potter <caitp@igalia.com> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org> Reviewed-by: Jakob Gruber <jgruber@chromium.org> Commit-Queue: Caitlin Potter <caitp@igalia.com> Cr-Commit-Position: refs/heads/master@{#47058}
69 lines
1.6 KiB
JavaScript
69 lines
1.6 KiB
JavaScript
// Copyright 2017 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --harmony-async-iteration --allow-natives-syntax
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// Yield a thenable which is never settled
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testAsync(test => {
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test.plan(0);
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let awaitedThenable = { then() { } };
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async function* gen() {
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yield awaitedThenable;
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test.unreachable();
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}
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gen().next().then(
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(iterResult) => test.unreachable(),
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test.unexpectedRejection());
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}, "yield-await-thenable-pending");
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// Yield a thenable which is fulfilled later
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testAsync(test => {
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test.plan(1);
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let resolve;
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let awaitedThenable = { then(resolveFn) { resolve = resolveFn; } };
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async function* gen() {
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let input = yield awaitedThenable;
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test.equals("resolvedPromise", input);
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}
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gen().next().then(
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(iterResult) => {
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test.equals({ value: "resolvedPromise", done: false }, iterResult);
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},
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test.unexpectedRejection());
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test.drainMicrotasks();
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resolve("resolvedPromise");
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}, "yield-await-thenable-resolved");
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// Yield a thenable which is rejected later
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testAsync(test => {
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test.plan(2);
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let reject;
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let awaitedThenable = { then(resolveFn, rejectFn) { reject = rejectFn; } };
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async function* gen() {
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try {
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yield awaitedThenable;
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} catch (e) {
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test.equals("rejection", e);
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return e;
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}
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}
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gen().next().then(
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(iterResult) => {
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test.equals({ value: "rejection", done: true }, iterResult);
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},
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test.unexpectedRejection());
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test.drainMicrotasks();
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reject("rejection");
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}, "yield-await-thenable-rejected");
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