TypeScript Best Practices

TypeScript adds static typing to JavaScript, making code more maintainable and less error-prone.

Use Strict Mode

Always enable strict mode in your tsconfig.json:

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

Prefer Interfaces for Objects

Use interfaces to define object shapes:

interface User {
  id: number
  name: string
  email: string
}

const user: User = {
  id: 1,
  name: "John",
  email: "john@example.com"
}

Use Type Inference

Let TypeScript infer types when possible:

const numbers = [1, 2, 3]
const doubled = numbers.map(n => n * 2)

Avoid any

Never use any unless absolutely necessary. Use unknown instead:

function processData(data: unknown) {
  if (typeof data === 'string') {
    return data.toUpperCase()
  }
}

Conclusion

These practices will help you write better TypeScript code that's easier to maintain and less prone to bugs.