TypeScript Best Practices for Modern Development

TypeScript has become the standard for large-scale JavaScript applications. Let's explore the best practices and patterns that will help you write better TypeScript code in 2024.

1. Type Safety First

Always strive for maximum type safety:

2. Use Strict Mode

Enable strict mode in your tsconfig.json to catch potential issues early:

This enforces stricter type checks, reducing runtime errors and improving code quality.

3. Prefer Type Inference

TypeScript has powerful type inference, so avoid unnecessary type annotations:

However, explicitly defining types is recommended for function parameters and return types.

4. Use Union & Intersection Types

Leverage union (|) and intersection (&) types for better flexibility:

5. Leverage Utility Types

TypeScript provides built-in utility types for common scenarios:

6. Avoid any, Prefer unknown

Using any defeats the purpose of TypeScript. Prefer unknown when dealing with unknown types:

7. Use Generics for Reusability

Generics enhance flexibility while maintaining type safety:

8. Avoid Overusing Enums, Use as const

Instead of enum, prefer as const for better optimization:

9. Handle Errors with never

Use never to ensure exhaustive type checks in switch statements:

10. Testing with TypeScript

Use Jest or Vitest with TypeScript for unit tests:

Conclusion

Following these best practices will help you write scalable, maintainable, and error-free TypeScript applications.