refactor: valibot plugin nullish

[mrlubos]

Related #2323

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🦋 Changeset detected

Latest commit: ea6f386

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@hey-api/shared	Patch
@hey-api/openapi-ts	Minor
@hey-api/openapi-python	Patch

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Project	Deployment	Actions	Updated (UTC)
hey-api-docs	Ready	Preview, Comment	Feb 15, 2026 10:04am

[codecov]

Codecov Report

❌ Patch coverage is 0% with 155 lines in your changes missing coverage. Please review.
✅ Project coverage is 39.50%. Comparing base (a55a5e1) to head (ea6f386).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...ckages/openapi-ts/src/plugins/valibot/v1/walker.ts	0.00%	103 Missing and 18 partials ⚠️
.../openapi-ts/src/plugins/valibot/v1/toAst/object.ts	0.00%	15 Missing and 2 partials ⚠️
...ges/openapi-ts/src/plugins/valibot/v1/processor.ts	0.00%	5 Missing and 2 partials ⚠️
...s/openapi-ts/src/plugins/valibot/v1/toAst/array.ts	0.00%	4 Missing and 1 partial ⚠️
...s/openapi-ts/src/plugins/valibot/v1/toAst/tuple.ts	0.00%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3396      +/-   ##
==========================================
- Coverage   39.59%   39.50%   -0.10%     
==========================================
  Files         473      473              
  Lines       17080    17119      +39     
  Branches     5224     5211      -13     
==========================================
  Hits         6763     6763              
- Misses       8266     8301      +35     
- Partials     2051     2055       +4     

Flag	Coverage Δ
unittests	39.50% <0.00%> (-0.10%)	⬇️

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commit: ea6f386