there is no ['!col'] in my worksheet.
var workbook = XLSX.readFile('inputFiles/data.xls');
const worksheet = workbook.Sheets.Sheet1;
Column widths are currently calculated only for XLSX and they are available at the key '!cols'.
Thanks.
After save to XLSX, still no ['!cols'] in my worksheet.

@sheeeeep can you change the read line to:
var workbook = XLSX.readFile('inputFiles/data.xlsx', {cellStyles:true});
It's ok, thank you very much.
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@sheeeeep can you change the read line to: