JavaScript (professional)

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

Use official MDN JavaScript docs, ECMAScript specification, and Node.js docs for API truth; this skill encodes predictable runtime behavior, explicit contracts, and failure-aware patterns — not syntax trivia alone.

Boundary

javascript-pro owns language and runtime semantics (execution order, coercion, modules, async). typescript-pro owns static types configuration; react-pro / nestjs-pro own framework lifecycles; security-pro owns threat modeling beyond language hygiene.

Related skills (this repo)