Add preact integration for tanstack form

[JoviDeCroock]

🎯 Changes

• Add new @tanstack/preact-form package to the monorepo.
• Use @tanstack/preact-store instead of @tanstack/react-store.
• Use useId from preact/hooks for form ID generation.
• Set preact peer dependency to >10.11.0 for useId support.

[changeset-bot]

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Latest commit: 946e68a

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[nx-cloud]

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---

☁️ Nx Cloud last updated this comment at 2026-02-24 15:05:21 UTC

[theVedanta]

compat and use-client are the only things I wanna flag, since they're in multiple files. Apart from that, looks okay. The onInput prop isn't important as such, but would be a nice-to-have.

[theVedanta]

I feel like fields should have an onInput prop instead of onChange for it to be consistent with Preact. If we can do that, it'd be awesome

[JoviDeCroock]

I don't think anyone would benefit from that, the end-user is still free to use onInput in exchange for onChange at their disposal

[theVedanta]

Oh, gotcha. But how would users use onInput in parts of the API that are not the children?

          <form.Field
            name="firstName"
            validators={{
              onInput: ({ value }) =>
                !value
                  ? 'A first name is required'
                  : value.length < 3
                    ? 'First name must be at least 3 characters'
                    : undefined,
            }}
            ...

I can understand if you feel like they don't, I was only thinking about it because of consistency with Preact's naming.

[JoviDeCroock]

Ah I see what you mean now, sorry I didn't derive the validator enforcement from the comment

[crutchcorn]

Validators should use onChange even on adapters that use onInput. That comes from core. No need to change :)

[theVedanta]

Once we can finalize this, let's get the docs in place and merge! Super excited to use preact-form 🔥

[theVedanta]

Oh, gotcha. But how would users use onInput in parts of the API that are not the children?

          <form.Field
            name="firstName"
            validators={{
              onInput: ({ value }) =>
                !value
                  ? 'A first name is required'
                  : value.length < 3
                    ? 'First name must be at least 3 characters'
                    : undefined,
            }}
            ...

I can understand if you feel like they don't, I was only thinking about it because of consistency with Preact's naming.

[sentry]

Codecov Report

❌ Patch coverage is 95.77465% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.31%. Comparing base (6892ed0) to head (946e68a).
⚠️ Report is 141 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/preact-form/src/useForm.tsx	86.48%	4 Missing and 1 partial ⚠️
packages/preact-form/src/createFormHook.tsx	97.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2043      +/-   ##
==========================================
- Coverage   90.35%   90.31%   -0.04%     
==========================================
  Files          38       55      +17     
  Lines        1752     2148     +396     
  Branches      444      522      +78     
==========================================
+ Hits         1583     1940     +357     
- Misses        149      186      +37     
- Partials       20       22       +2     

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