Article

TypeScript Best Practices for Frontend Developers

DevNotes Team

📅 February 13, 2026

⏱️ 12 min

TypeScript is more than just “JavaScript + types”. When used correctly, it helps you write safer, more maintainable code with significantly fewer bugs.

1. Use `interface` for Objects, `type` for Everything Else


// ✅ Interface for object shapes
interface User {
  id: string;
  name: string;
}
 
// ✅ Type for unions, intersections
type Status = 'active' | 'inactive';

2. Avoid `any` — Use `unknown` Instead


// ❌ any — disables type checking
function parse(text: string): any {
  return JSON.parse(text);
}
 
// ✅ unknown — requires type check before use
function parse(text: string): unknown {
  return JSON.parse(text);
}

3. Discriminated Unions — The Most Powerful Pattern


type AsyncState<T> = { status: 'loading' } | { status: 'success'; data: T } | { status: 'error'; error: string };

Conclusion

Applying these practices will make your TypeScript code more reliable and your team happier. 🎯

1. Use interface for Objects, type for Everything Else

2. Avoid any — Use unknown Instead

3. Discriminated Unions — The Most Powerful Pattern

Conclusion

1. Use `interface` for Objects, `type` for Everything Else

2. Avoid `any` — Use `unknown` Instead