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SlotFill: some code cleanups of the bubblesVirtually version #50133

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merged 4 commits into from
May 2, 2023

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@jsnajdr jsnajdr commented Apr 27, 2023

After the successful #50098, here are some more code improvements in the bubblesVirtually version of SlotFill:

  • when creating the registry for the context, we can save many useRefs and useCallbacks by creating the registry as a constant object and then storing it, forever, in provider's state.
  • similarly, we can save many useCallbacks in useSlot by creating the bound API object as a single api object, with useMemo.
  • finally there's a tiny change in Fill to move hook call into a separate statement, as is the common custom.

@jsnajdr jsnajdr added [Type] Code Quality Issues or PRs that relate to code quality [Package] Components /packages/components labels Apr 27, 2023
@jsnajdr jsnajdr requested review from youknowriad and tyxla April 27, 2023 12:16
@jsnajdr jsnajdr requested a review from ajitbohra as a code owner April 27, 2023 12:16
@jsnajdr jsnajdr self-assigned this Apr 27, 2023
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Size Change: -33 B (0%)

Total Size: 1.37 MB

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@Mamaduka Mamaduka left a comment

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The SlotFills "package" also has two hooks named useSlot one is a public API and another used internally. It would be nice to rename latter and avoid confusion.

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The cleanup looks good IMHO 👍 Thanks!

I agree with @Mamaduka that the naming conflict can be confusing, but I'd say that the entire situation with the two "standard" and "bubbles virtually" versions is a bit awkward too. Ideally, we'd have a single version that we could just configure.

Optionally, this could have a CHANGELOG entry, but up to you really.

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jsnajdr commented Apr 29, 2023

two hooks named useSlot one is a public API

There are just two usages of useSlot, one of them I'm removing in #50198. The other is in Popover, and I suspect it's removable, too. Then we could deprecate this public API, and make useSlot an internal helper again.

I'm also wondering if we can somehow get rid of useSlotFills, too. The only use case for it is to check whether a slot has any registered fills, looking just at the yes/no boolean information, never using the actual fills data. This information is then used to conditionally render the Slot.

@jsnajdr jsnajdr force-pushed the cleanup/bubbling-slot-fills branch from 6494585 to 7818c26 Compare April 29, 2023 06:31
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jsnajdr commented Apr 29, 2023

Optionally, this could have a CHANGELOG entry

Added the changelog entry in 7818c26, both for this PR and the related #50098.

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Flaky tests detected in 7818c26.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/4837403363
📝 Reported issues:

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tyxla commented May 1, 2023

I'm also wondering if we can somehow get rid of useSlotFills, too. The only use case for it is to check whether a slot has any registered fills, looking just at the yes/no boolean information, never using the actual fills data. This information is then used to conditionally render the Slot.

Well, registry.fills is a Map (ProxyMap to be precise) and while we could theoretically use registry.fills.size, I think there's a value in using the hook, since it uses useSnapshot to optimize for updates only when necessary - as per docs:

useSnapshot wraps the Valtio snapshot in an access-tracking proxy, so your component is render optimized, i.e. it will only re-render if keys that it (or its child components) specifically accessed have changed, and not on every single change to the proxy.

That being said, I'd rather keep the hook and benefit from the pre-existing performance optimizations. We could of course do some measurements.

@jsnajdr jsnajdr force-pushed the cleanup/bubbling-slot-fills branch from 7818c26 to 9a7587a Compare May 2, 2023 10:59
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jsnajdr commented May 2, 2023

there's a value in using the hook, since it uses useSnapshot to optimize for updates only when necessary

Yes, I'd like to keep all performance benefits, I'm just thinking aloud about what we really need useSlotFills for, and if it has the ideal API for that. It seems that the sole use case is to render a Slot or some other UI (inspector tab) only if we have any actual fills to fill the UI with. For that purpose, returning a boolean would be enough. Also, this use case is valid also for the v1 slots, with bubblesVirtually=false, so useSlotFills should work for both versions.

About valtio usage: I think that with modern useSyncExternalStore, we could implement the "trigger rerenders only when actually accessed keys change" optimization also in vanilla JS/React. It's much easier now than it was before.

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jsnajdr commented May 2, 2023

The "Verify changelog update" CI check is still unhappy about the changelog. Tt's because I added an entry for two PRs at once, referencing both of them:

- `SlotFill`: simplified the implementation and removed unused code (#50098 and #50133)

But the regexp in the check is more strict about parentheses, accepting only the (#50098) form. Cc @chad1008 -- maybe we want to relax the rules a bit? Not sure how frequently such changelog entries are done.

@jsnajdr jsnajdr merged commit f795ebe into trunk May 2, 2023
@jsnajdr jsnajdr deleted the cleanup/bubbling-slot-fills branch May 2, 2023 11:33
@github-actions github-actions bot added this to the Gutenberg 15.8 milestone May 2, 2023
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chad1008 commented May 2, 2023

Good point @jsnajdr, thanks for the ping. I see why it's confused and it'll be an easy enough fix. I'll get a PR together.

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4 participants