fix: Refactor ValueToResponseSchema type logic to account for return type something | undefined

[deadlinecode]

Refactor ValueToResponseSchema type to ensure only returning empty 200 schema on undefined or void. If it is something | undefined type response as infered return type.

Should fix #1762

Summary by CodeRabbit

• Refactor
  • Improved internal type handling logic for response schema generation to ensure more precise type definitions.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between bbaf6b7 and e03ae05.

📒 Files selected for processing (1)

• src/types.ts

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Walkthrough

A conditional type in ValueToResponseSchema<Value> has been refined to properly handle response types that are unions with undefined or void. The new logic excludes these values and only includes the 200 status when a concrete, non-never type remains, fixing type inference in client-server interactions.

Changes

Cohort / File(s)	Summary
Response Schema Type Logic src/types.ts	Updated R200 conditional type handling to use `Exclude<R200, undefined

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~35 minutes

Poem

🐰 When types with undefined did wrongly fade,
To unknown mists in schemas strayed,
A clever Exclude came out to play,
Now concrete types shine bright of day! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically describes the main change: refactoring ValueToResponseSchema type logic to handle return types that are unions with undefined.
Linked Issues check	✅ Passed	The code changes directly address issue #1762 by refactoring ValueToResponseSchema to correctly infer 200 response schemas when return types include undefined unions.
Out of Scope Changes check	✅ Passed	The change is a minimal, focused fix to src/types.ts that directly addresses the linked issue with no unrelated modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[deadlinecode]

Return type something | undefined is now actually typed as something | undefined | null but i think this comes from elysia because of the json stringification and should be correct like this?