Код для статьи A Comprehensive Guide to React.js in 2018 2

comprehensive-guide-tyler-2.js

import React from 'react'
import ReactDOM from 'react-dom'
class HelloWorld extends React.Component {
  render() {
    return (
      <div>Hello World!</div>
    )
  }
}
ReactDOM.render(<HelloWorld />, document.getElementById('root'));