scinote-web/app/javascript/packs/settings/index.jsx

// Run this example by adding <%= javascript_pack_tag 'hello_react' %> to the head of your layout file,
// like app/views/layouts/application.html.erb. All it does is render <div>Hello React</div> at the bottom
// of the page.

import React from 'react'
import ReactDOM from 'react-dom'

const Settings = () => (
  <div>Settings page</div>
)

document.addEventListener('DOMContentLoaded', () => {
  ReactDOM.render(
    <Settings />,
    document.getElementById('root')
  )
})