stencil-in-react.js

import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';

// my-component-library is the name of our made up Web Component library
// that we have published on npm
import { applyPolyfills, defineCustomElements } from 'my-component-library/loader';

ReactDOM.render(<App />, document.getElementById('root'));

applyPolyfills().then(() => {
  defineCustomElements(window);
})