TypeScript Best Practices for 2024

## Introduction

TypeScript continues to evolve, and staying up-to-date with best practices is essential for writing maintainable code.

Use Strict Mode

Always enable strict mode in your tsconfig.json:

{
  "compilerOptions": {
    "strict": true,
    "noUncheckedIndexedAccess": true,
    "noImplicitReturns": true
  }
}

Prefer Type Inference

Let TypeScript infer types when possible:

// ❌ Unnecessary type annotation

// ✅ Let TypeScript infer const name = "John"; ```

Use Utility Types

TypeScript provides powerful utility types:

interface User {
  id: string;
  name: string;
  email: string;
  password: string;

// Partial makes all properties optional type UpdateUser = Partial<User>;

// Omit removes specific properties type PublicUser = Omit<User, 'password'>;

// Pick selects specific properties type UserCredentials = Pick<User, 'email' | 'password'>; ```

Discriminated Unions

Use discriminated unions for type-safe handling of different cases:

type Result<T> =
  | { success: true; data: T }

function handleResult<T>(result: Result<T>) { if (result.success) { console.log(result.data); // TypeScript knows data exists } else { console.error(result.error); // TypeScript knows error exists } } ```

Conclusion

Following these practices will help you write more robust and maintainable TypeScript code.