TypeScript coding conventions

• Apply the active file's repository documentation, AGENTS.md, lint rules, and configuration first. Use this guidance for TypeScript, including embedded TypeScript, and combine available framework, testing, or library skills when needed.
• Use Valibot for runtime validation schemas, following the project's schema organization and reusing existing contracts where applicable.

Avoid return undefined

Do not use return undefined. When exiting a function without a value, use a bare return.

if (item) {
  return
}

Extract non-trivial intermediate computations