TypeScript Type Safety Audit Skill

Purpose

Audit TypeScript code for type safety best practices. This skill ensures the type system is leveraged correctly to catch bugs at compile-time, prevent runtime type errors, and maintain type safety across API boundaries.

What This Skill Checks

Critical Violations (Block Commit)

1. Any Type Usage - Zero tolerance policy
2. Missing Branded Types - IDs must be branded
3. Missing Runtime Validation - API boundaries need validation
4. Type Assertions - Prefer type guards
5. Unsafe Null Handling - Check for null/undefined
6. Weak Generic Constraints - Generics need constraints
7. Non-Strict tsconfig - Must have strict mode

For detailed checks with code examples and rationale, see references/CHECKS-REFERENCE.md.

• Hermes Code Reviewer: Type Safety Patterns