JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jszip/2.5.0/jszip.min.js"></script>
<script src="https://cdn.rawgit.com/bpampuch/pdfmake/0.1.18/build/pdfmake.min.js"></script>
<script src="https://cdn.rawgit.com/bpampuch/pdfmake/0.1.18/build/vfs_fonts.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<link rel="stylesheet" href="https://cdn.datatables.net/1.10.15/css/jquery.dataTables.min.css">
<script src="https://cdn.datatables.net/1.10.15/js/jquery.dataTables.min.js"></script>
<script src="https://cdn.datatables.net/buttons/1.3.1/js/dataTables.buttons.min.js"></script>
<link rel="stylesheet" href="https://cdn.datatables.net/buttons/1.3.1/css/buttons.dataTables.min.css">
<script src="https://cdn.datatables.net/buttons/1.3.1/js/buttons.print.min.js"></script>
<script src="https://cdn.datatables.net/buttons/1.3.1/js/buttons.html5.min.js"></script>
<table id="example" class="table table-striped" data-export-title="test">
        <thead>
             <tr>
                <th>Name</th>
                <th>Position</th>
                <th>Office</th>
                <th>Age</th>
                <th> date</th>
                <th>Salary</th>
            </tr>
        </thead>
        <tfoot>
            <tr>
                <th>Name</th>
                <th>Position</th>
                <th>Office</th>
                <th>Age</th>
                <th>Start date</th>
                <th>Salary</th>
            </tr>
        </tfoot>
        <tbody>
            <tr>
                <td>Tiger Nixon</td>
                <td>System Architect</td>
                <td>Edinburgh</td>
                <td>61</td>
                <td>2011/04/25</td>
                <td>$320,800</td>
            </tr>
            <tr>
                <td>Garrett Winters</td>
                <td>Accountant</td>
                <td>Tokyo</td>
                <td>63</td>
                <td>2011/07/25</td>
               ...

JavaScript

/*$.extend( $.fn.dataTable.defaults, {
  buttons: [{ 
     extend: 'pdfHtml5',
     customize: function(doc) {
        doc.defaultStyle.fontSize = 40; 
     }   
   }]  
});
*/
$.extend($.fn.dataTable.defaults, { buttons: [{ 
  extend: 'excelHtml5', 
  text: 'test',
  title: 'abcd', 
  customize: function (xlsx) { 
    console.log('customize called', xlsx)
    var sheet = xlsx.xl.worksheets['sheet1.xml']; 
    $('row:first c', sheet).attr('s', '42'); 
  } 
  }] 
}); 
  
$('#example').DataTable( {
  dom: 'Bfrtip',
  buttons: {
    buttons: [{
      extend: 'excelHtml5',
      title: 'custom',
      customize: function (xlsx) {
        var sheet = xlsx.xl.worksheets['sheet1.xml'];
       // $('row:first c', sheet).attr('s', '42');
      }
    }]
  }
});