I had the same problem.
I Checked the /lib I have in my node_modules got from npm install exceljs and the git here. On the local /lib/worksheet.js the "addRows" function is simply not part of the Worksheet.prototype .
Before a fix is found you can add this after line 174:
addRows: function(value) { var self = this; value.forEach(function(row) { self.addRow(row); }); }

Any updates on this?

Bump, same here.

bump, i added bluedge's line of code to \exceljs\lib\stream\xlsx\worksheet-writer.js, however trying to stream it doesn't recognize the commit() method

How has this not been fixed yet?

i have the same problem,worksheet.addRows is not a function,do you deal it?

Any Solutions for this issue?

Facing this issue in 3.4.0 version. Any solution?

#569