Critical Rules

MANDATORY rules that must NEVER be violated. These prevent common bugs and ensure code quality.

Checklist

Rule 1: TypeScript Type Safety

• NEVER use any type - no exceptions, including tests
  • ❌ const data: any = response
  • ✅ const data: unknown = response
  • ✅ const data = response as UserData
  • ✅ For test mocks: as unknown as Type

Why: any disables all type checking and hides bugs. Use proper types, unknown, or type assertions instead.

Examples: