fix(Watch): correct render function parameter typing

[dusan233]

fixes #13105

[bluebill1049]

could you include some tests?

[dusan233]

could you include some tests?

I moved the type assertions into a .test-d.ts file. Previously they existed in watch.test.tsx but didn’t run because expectType was used outside a .test-d.ts file.

[Copilot]

Pull Request Overview

This PR fixes a TypeScript typing issue in the Watch component by adding the const modifier to the TFieldNames generic parameter. This change enables TypeScript to infer the exact tuple type of field names rather than widening them to a general array type, which improves type safety for the render function parameters.

• Added const type parameter modifier to TFieldNames generic in the Watch component
• Moved type tests from runtime test file to a dedicated TypeScript test file
• Updated API documentation to reflect the signature change

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/watch.tsx	Added const modifier to TFieldNames generic parameter to preserve literal tuple types
src/typetest/watch.test-d.ts	Added new TypeScript-specific type test for verifying render function parameter types
src/tests/watch.test.tsx	Removed runtime type test that was moved to dedicated type test file
reports/api-extractor.md.api.md	Updated API signature documentation to reflect the const modifier addition

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[mamlzy]

@bluebill1049 Could you publish this pr? this issue is a blocker for me to use Watch component🙏