This is a comprehensive reference for writing TypeScript the right way. It pushes type safety over convenience (unknown instead of any, explicit return types, readonly by default), includes a Result type pattern for error handling, and comes with Deno scripts to analyze code quality and generate types from JSON. The quick reference table is genuinely useful when you're in the middle of code and need to remember whether to use a type guard or an assertion. It won't teach you TypeScript from scratch, but if you're already writing it and want to stop cutting corners, this codifies the discipline.
npx skills add https://github.com/jwynia/agent-skills --skill typescript-best-practices