I followed the documentation
var workbook = createAndFillWorkbook();
and I get this error Object # has no method 'createAndFillWorkbook'
even if I required exceljs already
var Excel = require("exceljs");
What I wanted to do was to create a report but I am somehow confused on the documentation because it does not say here how to use the createAndFillWorkbook() method it just says here to use it right away.
I referred here in the documentation: https://github.com/guyonroche/exceljs#writing-xlsx