javascript - pdfmakeの列の背景色をfillColorで塗りつぶす方法は?

Question

列の背景色を で塗りつぶすオプションはありますfillColor: '#dedede'か? fillColorは tablecell で非常にうまく機能しますが、同時に列では機能しません:(

<script src="https://rawgit.com/bpampuch/pdfmake/master/build/vfs_fonts.js"></script>
<script src="https://rawgit.com/yelouafi/pdfmake/master/build/pdfmake.js"></script>
<script>
  function print(argument) {
    // open the PDF in a new window
    pdfMake.createPdf(docDefinition).open();
  }
</script>
<button onclick="print()" style="display:block; margin: 10px auto;padding: 20px 50px;">Print</button>
<hr>
<script>
  var docDefinition = {
    content: [
      'This paragraph fills full width, as there are no columns. Next paragraph however consists of three columns', {
        columns: [{
          // auto-sized columns have their widths based on their content
          width: 'auto',
          text: 'First column',
          fontSize: 30,
          fillColor: '#dedede'
        }, {
          // star-sized columns fill the remaining space
          // if there's more than one star-column, available width is divided equally
          width: '*',
          text: 'Second column'
        }, {
          // fixed width
          width: 100,
          text: 'Third column'
        }, {
          // percentage width
          width: '10%',
          text: 'Last column'
        }],
        // optional space between columns
        columnGap: 10
      },
      'This paragraph goes below all columns and has full width'
    ]
  };
</script>