content: import React from 'react';
  import ReactDOM from 'react-dom';
  import App from './App';
  
  console.log('QQQQ: index.js');
  ReactDOM.render(
    <React.StrictMode>
      <App />
    </React.StrictMode>,
    document.getElementById('root')
  );
  
  
  // import React from 'react';
  // import SparseDoc from './stories/doc1.sparse';
  // import {hydrate} from './tools/extract-doc';
  
  // console.log('QQQQ: index.sparse.js');
  // hydrate(<SparseDoc />, document.body);
  