TypeScript for React Developers: A Practical Guide

Adding TypeScript to your React project catches bugs before they happen. Here's everything you need to get started.

Typing Props

type ButtonProps = {
  label: string;
  onClick: () => void;
  variant?: 'primary' | 'secondary';
};

function Button({ label, onClick, variant = 'primary' }: ButtonProps) {
  return <button onClick={onClick} className={variant}>{label}</button>;
}

Typing useState

const [count, setCount] = useState<number>(0);
const [user, setUser] = useState<User | null>(null);

Typing Events

function handleChange(e: React.ChangeEvent<HTMLInputElement>) {
  setValue(e.target.value);
}

Final Thoughts

TypeScript pays dividends on large codebases. The initial learning curve is worth it. Start by typing props and work your way deeper.

Happy Coding!