TypeScript's type system is powerful enough to catch bugs at compile time that would otherwise reach production. Here are advanced patterns that make your code safer and more expressive.
Discriminated Unions
Loading code block...
Template Literal Types
Loading code block...
Conditional Types
Loading code block...
Mapped Types
Loading code block...
Type-Safe Builder Pattern
Loading code block...
Type-Safe API Client
Loading code block...
Branded Types
Loading code block...
Type Guards
Loading code block...
Utility Types
Loading code block...
Best Practices
DO:
✓ Use discriminated unions for state
✓ Prefer type inference where clear
✓ Use branded types for domain safety
✓ Write custom type guards
✓ Use template literals for patterns
DON'T:
✗ Overuse 'any' or 'as'
✗ Create overly complex types
✗ Ignore compiler errors
✗ Skip type documentation
Conclusion
Advanced TypeScript patterns encode business logic in the type system. Discriminated unions handle state, branded types prevent mixing, and conditional types enable flexible APIs.
The goal is catching bugs at compile time—before they reach production.