react declare custom proptypes code example
Example 1: install proptypes react
npm install --save prop-types
Example 2: react proptypes
import PropTypes from 'prop-types';
class Greeting extends React.Component {
render() {
return (
<h1>Hello, {this.props.name}</h1>
);
}
}
Greeting.propTypes = {
name: PropTypes.string
};