TypeScript Advanced: Patterns, Pitfalls & type-fest

This skill defines the rules, conventions, and architectural decisions for writing advanced TypeScript. It is intentionally opinionated to prevent common type-level bugs and enforce patterns that produce safe, maintainable code.

For detailed API documentation of TypeScript features, use other appropriate tools (documentation lookup, web search, etc.) — this skill focuses on when, why, and how to use advanced type features correctly.

Type Safety Philosophy

any vs unknown vs never — the only rule you need