Hi,
just had the time to test 0.18.2 and in runs into a "Range Error: Invalid array length" issue when doing a "XLSX.writeFile(wb, args.fileName)" on a workbook which perfectly works fine with 0.17.5 (we're talking about one sheet with 25000 rows * 186 columns). Replacing xlsx.full.min.js with the 0.17.5 version and it is running and saving fine. 0.18.2 creates the problem.

Only had a quick look at the minimized code (sorry): The error is happening in xlsx.full.min.js at pos 9:22755 (corresponds to function z(e){var r=new Array(e.length);for(var t=0;t<e.length;++t)r[t]=String.fromCharCode(e[t]);return r.join("")} This is most likely the "a2s" function
....so maybe another unicode issue? Would be great if you can check it. In the meantime I try to do more tests on my side checking which data is actually used there.

Small update: Use xlsx.js and it is indeed the a2s(o) function (line 2124). The o.length is in my crashing case 181579121 but when reaching already i=11184812 and setting out[i] to whatever leads to the invalid array length error. Call stack comes from write, write_zip_denouement, write_zip_type....

Using Win11 with Edge 98.0.1108.62 by the way