How to add cell border to SheetJS .xlsx generated file?

Question

I have a SheetJS .xlsx generated file, but I have not been able to put border to the cells.

I have this:

And I need this:

Is there a way to do it with SheetJS? It will be cool if there's a way to apply another cell styles, like background color.

EDIT:

I'm making the sheets with this function:

function makeSheet(wb, day){        //sheet for a specific day
    var ws = XLSX.utils.table_to_sheet(document.getElementById("table"+day));
    wb.SheetNames.push(day);
    wb.Sheets[day] = ws;
    //columns width working ok
    wb["Sheets"][day]["!cols"] = [{ wpx : 70 },{ wpx : 121 }];
    //wb["Sheets"][day]["A1"]["s"] = {"border":"1px"};  //I've tried this but doesn't work
  return wb;
}

EDIT 2

I've created this example snippet, if you can put borders and/or another cell style here, that's going to be a victory:

Answer 1

You are using community version of SheetJS library and with this version can not do styling. BUT in Pro Version styling feature is available.

Checkout this official comment:

This is the community version. We also offer a pro version with performance enhancements, additional features like styling, and dedicated support.

For more information about Pro Version visit their official site: http://sheetjs.com/pro