type-safety-patterns

Type guards in TypeScript enable runtime checks for complex types, ensuring data integrity when handling unknown inputs. You can use user-defined type guards to narrow down types and validate external data structures dynamically.

Branded types in TypeScript prevent accidental mixing of types sharing the same underlying representation, such as UserId and OrderId. You need them when designing public APIs to ensure consumers use identifiers correctly and safely.

Discriminated unions model API responses with clear, type-safe variants in TypeScript. They allow you to define state machines and handle different response states by checking a shared discriminant property at compile time.

Generics are the best way to create reusable, type-safe functions and classes in TypeScript that work with various data types. They allow you to write flexible utilities while maintaining strict compile-time error prevention.

You can prevent compile-time errors in TypeScript by leveraging advanced type system features like branded types, discriminated unions, and generics. Adhering to strict type definitions ensures robust API design and early error detection.