Add self.queueMicrotask() #2789
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| @@ -89383,7 +89394,7 @@ dictionary <dfn>PromiseRejectionEventInit</dfn> : <span>EventInit</span> { | |||
| <p>To affect the world of observable JavaScript objects, then, you must <span>queue a task</span> | |||
| to perform any such manipulations. This ensures your steps are properly interleaved with respect | |||
| to other things happening on the <span>event loop</span>. Furthermore, you must choose a | |||
| <span>task source</span> when <span data-x="queue a task">queueing a task</span>; this governs the | |||
| <span>task source</span> when <span data-x="queue a task">queuing a task</span>; this governs the | |||
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Both are correct so we should add this to the Style Guide.
| @@ -90402,6 +90413,9 @@ interface mixin <dfn>WindowOrWorkerGlobalScope</dfn> { | |||
| long <span data-x="dom-setInterval">setInterval</span>(<span>TimerHandler</span> handler, optional long timeout = 0, any... arguments); | |||
| void <span data-x="dom-clearInterval">clearInterval</span>(optional long handle = 0); | |||
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| // microtask queuing | |||
| void <span data-x="dom-queueMicrotask">queueMicrotask</span>(<span data-x="idl-Function">Function</span> <var>callback</var>); | |||
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I can't see a reason why they wouldn't have this.
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I'd like to explore that separately, if so. There is no shared mixin right now so doing so is not straightforward. And from what I understand not all worklets have event loops?
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They all have an event loop I believe. They just don't queue new tasks, but that doesn't matter here.
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But also, wouldn't that mean we'd add a new mixin that encompasses all? Or would we solve it differently?
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Yeah, I don't know what the right solution is. I'd like to work on such an expansion in collaboration with the worklets editors, as a new feature, instead of holding up this (implementer consensus/tests ready/spec ready) feature on figuring out the details.
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I guess I'm okay with that, provided there's a follow-up issue. I do think it'll result in this method being moved to a new mixin, but so be it.
| <h3>Microtask queuing</h3> | ||
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| <p>The <code data-x="dom-queueMicrotask">queueMicrotask()</code> method allows authors to schedule | ||
| a callback on the <span>microtask queue</span>. This allows their code to run after the |
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Technically it's at the end of the task, no?
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I'd call step 6 "after" step 3 in https://html.spec.whatwg.org/#event-loop-processing-model
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| browser's <span>event loop</span>, as would be the case when using, for example, <code | ||
| data-x="dom-setTimeout">setTimeout(<var>f</var>, 0)</code>.</p> | ||
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| <p>Authors should be aware that scheduling a lot of microtasks has the same performance downsides |
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(This also still needs implementation bugs.) |
…stonly Automatic update from web-platform-testsAdd tests for self.queueMicrotask() Follows whatwg/html#2789. -- wpt-commits: 0c3bed38df6d9dcd1441873728fb5c1bb59c92df wpt-pr: 6334
…stonly Automatic update from web-platform-testsAdd tests for self.queueMicrotask() Follows whatwg/html#2789. -- wpt-commits: 0c3bed38df6d9dcd1441873728fb5c1bb59c92df wpt-pr: 6334
…stonly Automatic update from web-platform-testsAdd tests for self.queueMicrotask() Follows whatwg/html#2789. -- wpt-commits: 0c3bed38df6d9dcd1441873728fb5c1bb59c92df wpt-pr: 6334 UltraBlame original commit: 141be436c496b0715eac4f3a7c0c6a0c25392a59
…stonly Automatic update from web-platform-testsAdd tests for self.queueMicrotask() Follows whatwg/html#2789. -- wpt-commits: 0c3bed38df6d9dcd1441873728fb5c1bb59c92df wpt-pr: 6334 UltraBlame original commit: 141be436c496b0715eac4f3a7c0c6a0c25392a59
…stonly Automatic update from web-platform-testsAdd tests for self.queueMicrotask() Follows whatwg/html#2789. -- wpt-commits: 0c3bed38df6d9dcd1441873728fb5c1bb59c92df wpt-pr: 6334 UltraBlame original commit: 141be436c496b0715eac4f3a7c0c6a0c25392a59
Closes #512.
Tests: web-platform-tests/wpt#6334
Chrome is tentatively interested in implementing this, so I'm getting a spec and tests up for review. The actual spec is a one-liner that does what you expect, but I tried to capture some of the discussions from #512 about when this is and isn't appropriate.
Let's continue using #512 for discussion on the merits of this feature, instead of forking the discussion into this PR.
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