Sailsjs download a stream of data

Question

I have a sails application that I'm using exceljs to generate an excel file. Looking at their documenatation:

https://www.npmjs.com/package/exceljs#writing-xlsx

It appears they allow writing to a stream.

// write to a stream 
workbook.xlsx.write(stream)
    .then(function() {
        // done 
    });

How can I do this when the user is expecting a response?

I read the below:

http://sailsjs.org/documentation/concepts/custom-responses/adding-a-custom-response

http://sailsjs.org/documentation/concepts/custom-responses/default-responses

I also tried res.attachment() after saving the file and was not successful. Is there something i'm missing?

EDIT

The answer below is almost right. I did the following and it worked. The previous solution had sometimes corrupt files.

    res.setHeader('Content-Type', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
    res.setHeader("Content-Disposition", "attachment; filename=" + "Report.xlsx");
    return workbook.xlsx.write(res)
      .then(function() {
        res.end();
      });

This worked on my EC2 instance and locally.

Answer 1

Solution: https://github.com/guyonroche/exceljs/issues/37 write the workbook to the response.

var Excel = require('exceljs');
var workbook = new Excel.Workbook();
var sheet = workbook.addWorksheet("My Sheet");
res.setHeader('Content-Type', 'application/vnd.openxmlformats');
res.setHeader("Content-Disposition", "attachment; filename=" + "Report.xlsx");
workbook.xlsx.write(res);
res.end();