Using TypeScript the right way
TypeScript has become the standard in professional web development. But there is a big difference between "using TypeScript" and "using TypeScript well." This article summarizes the key best practices for 2025.
Key recommendations
- Strict mode is mandatory — no exceptions
- Discriminated unions over broad union types
- Zod or Valibot for runtime validation at system boundaries
- No any types — unknown as a safe alternative
- Template literal types for type-safe string patterns
Common pitfalls
Type assertions (as) bypass the compiler and are a common source of errors. Generics are often used with excessive complexity where simple types would suffice. Less is more.