Prop validation in React code example

Example 1: 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
};

Example 2: react propthpes or

size: PropTypes.oneOfType([
  PropTypes.string,
  PropTypes.number
]),