title: React Data Grid failing to compile
body: <p>I recently install react-data-grid component, and started to try to test it out. It should work from the documentation but I get a compilation error that I am not understanding. I would appreciate some help. Thanks.</p>
  <p>Below is the error. I am getting</p>
  <pre><code>./node_modules/react-data-grid/lib/DataGrid.js 102:37
  Module parse failed: Unexpected token (102:37)
  File was processed with these loaders:
   * ./node_modules/babel-loader/lib/index.js
  You may need an additional loader to handle the result of these loaders.
  |   const totalHeaderHeight = headerRowHeight + (enableFilters ? headerFiltersHeight : 0);
  |   const clientHeight = height - 2 // border width
  &gt;   - totalHeaderHeight - (summaryRows?.length ?? 0) * rowHeight - (totalColumnWidth &gt; viewportWidth ? getScrollbarSize() : 0);
  |   const [rowOverscanStartIdx, rowOverscanEndIdx] = getVerticalRangeToRender(clientHeight, rowHeight, scrollTop, rows.length);
  |   /**
  </code></pre>
  <p>This is my code :</p>
  <pre><code>import React from 'react';
  import ReactDataGrid from 'react-data-grid';
  import './App.css';
  
  const columns = [
    { key: 'id', name: 'ID' },
    { key: 'title', name: 'Title' },
    { key: 'count', name: 'Count' }];
  
  const rows = [{ id: 0, title: 'row1', count: 20 }, { id: 1, title: 'row1', count: 40 }, { id: 2, title: 'row1', count: 60 }];
  
  function App() {
    return (
      &lt;ReactDataGrid
        columns={columns}
        rowGetter={i =&gt; rows[i]}
        rowsCount={3}
        minHeight={150} /&gt;
    );
  }
  
  export default App;
  </code></pre>
  <p>Thanks!</p>