TypeScript Best Practices for 2024

TypeScript has become the standard for building large-scale JavaScript applications. Here are the best practices you should follow in 2024.

Use Strict Mode

Always enable strict mode in your tsconfig.json:

{
  "compilerOptions": {
    "strict": true
  }
}

Prefer Interfaces for Object Types

Use interfaces for object shapes that might be extended:

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

interface AdminUser extends User { permissions: string[]; } ```

Use Type Inference

Let TypeScript infer types when obvious:

// Good - type is inferred

// Unnecessary - explicit type const name: string = 'Krishna'; ```

Avoid 'any' Type

Never use any. Use unknown instead and narrow the type:

function processData(data: unknown) {
  if (typeof data === 'string') {
    return data.toUpperCase();
  }
  throw new Error('Expected string');
}

Use Discriminated Unions

For complex state management:

type State =
  | { status: 'loading' }
  | { status: 'success'; data: User[] }
  | { status: 'error'; error: string };

Conclusion

Following these TypeScript best practices will help you write more maintainable, type-safe code that catches errors at compile time rather than runtime.