text: import xlsx from 'node-xlsx';
  // Or var xlsx = require('node-xlsx').default;
  
  const dataSheet1 = [[1, 2, 3], [true, false, null, 'sheetjs'], ['foo', 'bar', new Date('2014-02-19T14:30Z'), '0.3'], ['baz', null, 'qux']];
  const dataSheet2 = [[4, 5, 6], [7, 8, 9, 10], [11, 12, 13, 14], ['baz', null, 'qux']];
  const range = {s: {c: 0, r:0 }, e: {c:0, r:3}}; // A1:A4
  const sheetOptions = {'!merges': [ range ]};
  
  var buffer = xlsx.build([{name: "myFirstSheet", data: dataSheet1}, {name: "mySecondSheet", data: dataSheet2, options: sheetOptions}]); // Returns a buffer
  