docs: add Valibot examples to validation guide

[fabian-hiller]

The validation guide names Valibot as a supported Standard Schema library but there are no code examples for it. This adds a Valibot example based on the existing Zod one. The snippet is type-checked against the latest @tanstack/react-form and valibot. I'm the author of Valibot.

Summary by CodeRabbit

• Documentation
  • Added a React guide example showing how to validate an age field with Valibot.
  • Demonstrated integrating Standard Schema validation with form fields and form state.

[coderabbitai]

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 4d3047c and 185aebe.

📒 Files selected for processing (1)

• docs/framework/react/guides/validation.md

🚧 Files skipped from review as they are similar to previous changes (1)

• docs/framework/react/guides/validation.md

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📝 Walkthrough

Walkthrough

The validation guide adds a Valibot example for Standard Schema validation. The example validates an age field with a minimum value of 13 and connects the schema to useForm and form.Field.

Changes

Valibot validation example

Layer / File(s)	Summary
Add Valibot form validation example docs/framework/react/guides/validation.md	Adds a Valibot schema with v.object, v.pipe, v.number, and v.minValue. The example connects the schema to the form’s onChange validator.

Estimated code review effort: 1 (Trivial) | ~3 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description explains the Valibot documentation change but omits the required Changes, Checklist, and Release Impact sections.	Add the required template sections, complete both checklist items, and indicate that this documentation-only change has no release impact.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely identifies the documentation change and the added Valibot examples.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[fabian-hiller]

I try to improve the visibility and adoption of Valibot and am therefore thankful for code examples in other docs but if this is the wrong place for it, feel free to close this PR.

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 4d3047c

Command	Status	Duration	Result
nx affected --targets=test:sherif,test:knip,tes...	✅ Succeeded	39s	View ↗
nx run-many --target=build --exclude=examples/**	✅ Succeeded	1s	View ↗

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☁️ Nx Cloud last updated this comment at 2026-08-11 20:20:48 UTC

[LeCarbonator]

LGTM! Thanks for the docs snippet!

[pkg-pr-new]

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commit: 185aebe