Mastering TypeScript: A Guide to Better JavaScript

TypeScript has become the gold standard for building robust web applications. But many developers only scratch the surface.

Why TypeScript Matters

JavaScript is dynamic. TypeScript adds static typing, catching bugs before production. Teams report 15-20% fewer bugs.

Advanced Patterns

Utility Types

interface User { id: number; name: string; }
type UpdateUser = Partial<User>;
type UserCredentials = Pick<User, 'email' | 'role'>;

Discriminated Unions

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

Best Practices

1. Avoid any - Use unknown instead
2. Enable strict mode in tsconfig.json
3. Use branded types for IDs
4. Type your environment variables