TypeScript Best Practices for Large Scale Applications

Project Structure

When working on large scale TypeScript applications, having a well-defined project structure is crucial. Consider organizing your codebase as follows:

• src/components - Reusable UI components
• src/services - API calls and data fetching
• src/utils - Helper functions
• src/types - Shared TypeScript interfaces and types

Strong Typing

One of the main benefits of TypeScript is static typing. Use it to its full potential:

// Good
interface User {
  id: string;
  name: string;
  email: string;
}

function getUserById(id: string): User {
  // Implementation
}

// Avoid
function getUserById(id: any): any {
  // Implementation
}

Use Enums for Constants

Instead of using string literals throughout your code, consider using enums:

enum UserRole {
  ADMIN = 'admin',
  USER = 'user',
  GUEST = 'guest'
}

function checkPermission(role: UserRole) {
  // Implementation
}

Advanced TypeScript Features

For complex applications, leverage advanced TypeScript features:

• Generics
• Type guards
• Intersection types
• Union types
• Conditional types