ts-react-proptypes.tsx

// without TypeScript

import PropTypes from 'prop-types';

class Greeting extends React.Component {
  render() {
    return (
      <h1>Hello, {this.props.name}</h1>
    );
  }
}

Greeting.propTypes = {
  name: PropTypes.string
};

// With TypeScript (no 'prop-types' import needed, and no config)
type Props = { name: string };
class Greeting extends React.Component<Props> {
  render() {
    return (
      <h1>Hello, {this.props.name}</h1>
    );
  }
}