convert testUtils to ts

[AbanoubGhadban]

Summary

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• Add/update test to cover these changes
• Update documentation
• Update CHANGELOG file

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Summary by CodeRabbit

• Refactor
  • Internal improvements to type safety and control flow handling in test utilities. No changes to public APIs or user-facing functionality.

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[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

Refactors type safety in createNodeReadableStream test utility by introducing explicit typing for internal state: pendingChunks becomes Buffer[], and pushFn becomes a nullable function type with tightened Buffer-only signatures and guarded invocations.

Changes

Cohort / File(s)	Change Summary
Type refinement for stream state management packages/react-on-rails-pro/tests/testUtils.ts	Introduces explicit typing: pendingChunks as Buffer[], pushFn as ((chunk: Buffer | undefined) => void) | null. Tightens push function signature to accept only Buffer type. Updates read lifecycle to initialize pushFn with this.push.bind(this) and guards chunk pushes with nullable checks.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

• Verify nullable handling logic for pushFn is correct and prevents runtime errors
• Confirm Buffer type alignment throughout the stream's push/read lifecycle
• Validate that type narrowing guards properly protect against undefined scenarios

Poem

🐰 With types now clear as morning dew,
Buffer arrays shine bright and true,
No more generic, vague, or loose,
Our streams now type-safe, no excuse!
Nullable guards and bindings tight—
Test utils gleam with typed delight! ✨

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch convert-test-utils-to-ts

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 840f9c7 and fa5164e.

📒 Files selected for processing (1)

• packages/react-on-rails-pro/tests/testUtils.ts (2 hunks)

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