idea2: add getParams to createAtom

[dmaskasky]

Related Bug Reports or Discussions

idea1: #2678
Discussion: #2056

Fixes #
jotaijs/jotai-scope#50

Summary

jotai-scope is trying to support scoping atomFamily.

const fooFamily = atomFamily((id) => atom(id))
<ScopedProvider atoms={[fooFamily]}>{children}</ScopeProvider>

This PR demonstrates one approach in which the atomFamily supports a new getParams function.
The following pseudo code represents logic that would live in jotai-scope. For obvious complexity reasons, I find this solution less favorable to #2678.

const isExplicitlyScoped = atomSet.has(atom) || 
  Array.from(atomSet)
    .filter(isAtomFamily)
    .some((af) => af.getParams().map(af).includes(atom))

Check List

• pnpm run prettier for formatting code and docs

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Name	Status	Preview	Comments	Updated (UTC)
jotai	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 29, 2024 3:27am

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Preview in LiveCodes

Latest commit: 6008aa7
Last updated: Jul 29, 2024 3:27am (UTC)

Playground	Link
React demo	https://livecodes.io?x=id/DYPJ8VT87

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See documentations for usage instructions.

[dai-shi]

This looks good as it's sometimes requested.

[dai-shi]

Maybe we should just return the iterator:

Suggested change

	return Array.from(atoms.keys())
	return atoms.keys()

[dmaskasky]

I don't think this change will satisfy jotai-scope's use-case. Closing this PR for now, we can reopen when a community need arises.

[dai-shi]

I think this should be reopened and we consider merging, even if it doesn't work for jotai-scope. But, yeah, we can do it when there's a need.