TypeScript coding conventions

Apply conventions from the documentation, AGENTS.md files, lint rules, and configuration of the repository containing the active file first. Then use this skill for general TypeScript guidance, including TypeScript embedded in other file formats. Combine it with more specific framework, testing, or library-focused skills when needed.

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