chore: write output to disk when testing codemod

[paoloricciuti]

I'm working on fixing the codemod and while doing so I found pretty hard working with it because you are going off the diff in the console (also since whitespace counts you can't even copy the new output if it's meant to change).

This is a small chore that makes everything easier to reason and work with: when we test something we also write the _actual transform to disk so that you can open it with your editor of choice, look at the diff and even copy paste the result once you are satisfied with it.

Obviously it's git-ignored so we don't flood the repo, it's just for debugging purpose.

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Name	Status	Preview	Comments	Updated (UTC)
valibot	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 24, 2025 2:44pm

[Copilot]

Pull Request Overview

This PR adds development tooling to improve the debugging experience when working on the zod-to-valibot codemod by writing transformed output to disk during testing.

• Adds file system write operation to save actual transform output as _actual.ts files during test execution
• Updates .gitignore to exclude the generated _actual.ts files from version control

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
codemod/zod-to-valibot/src/utils.ts	Adds fs.writeFileSync call to save transform output to disk for debugging
codemod/zod-to-valibot/.gitignore	Excludes generated _actual.ts files from git tracking

Comments suppressed due to low confidence (1)

codemod/zod-to-valibot/src/utils.ts:69

• The writeFileSync operation could fail due to file system permissions or disk space issues, but there's no error handling. Consider wrapping this in a try-catch block to prevent test failures when the debugging file cannot be written.

      fs.writeFileSync(path.join(testPath, '_actual.ts'), output?.trim() ?? '');

[fabian-hiller]

Great idea!

[fabian-hiller]

Feel free to reach out to me on Discord if you want to chat with me directly when working on the codemod!

[paoloricciuti]

Feel free to reach out to me on Discord if you want to chat with me directly when working on the codemod!

Just sent you a friend request, I also commented back on the bsky thread but discord will be faster 🤟🏻