TypeScript Patterns

TypeScript patterns and strict typing rules.

Quick Reference

• Imports: See imports.md for path aliases (~/@, ~~/, #shared, #server)
• Types: See types.md for interfaces and when to use interface vs type
• Type Guards: See guards.md for type predicates and runtime type checking
• Type Assertions: See type-assertions.md for avoiding as keyword
• Validation: See validation.md for Valibot validation patterns

Strict Typing Rules

• NO any types - always use proper types or unknown
• Explicit return types on exported functions
• Use unknown for uncertain types, then narrow with type guards
• Import types separately: import type { ... } when only importing types