TypeScript (professional)

Skill text is English; answer in the user’s preferred language when rules or the conversation specify it.

Use official TypeScript docs for language reference; this skill encodes type system discipline, compiler configuration, failure modes, and edge-case awareness — not a full duplicate of the handbook. Confirm TypeScript version, tsconfig strict settings, and module system (ESM vs CJS / NodeNext) when known.

Boundary

typescript-pro owns types, narrowing, generics, and tsconfig semantics at the language level. javascript-pro owns runtime JS behavior when the bug is not a type issue. Framework skills own idiomatic patterns for React/Nest/Next wiring.

Related skills (this repo)

Skill	When to combine
`javascript-pro`	Runtime behavior (closures, prototypes, async) underlies the issue
`react-pro`	TSX, props, hook generics
`nextjs-pro`	App Router types, `metadata`, server/client boundaries
`nestjs-pro`	Decorator metadata, controller/service DTO types
`testing-pro`	Mock typing, helper generics