width attribute not working

[Spandana-Gajangi]

column width is not increasing. here I'm attaching sample code and output file.

let workSheet={}
//workSheet.stylesXmlFile = "styles.xml";
workSheet.cols=[{
caption:'key',
type:'string',
width:50,
},
{
caption:'buyerKey',
type:'string',
width:100,
},
{
caption:'buyerName',
type:'string',
width:100,
},
{
caption:'invoiceNumber',
type:'string',
width:500,
},
{
caption:'amount',
type:'string',
width:100,
},
{
caption:'id',
type:'string',
},
{
caption:'originalDueDate',
type:'string',
width:200,
},
{
caption:'generatedAtUtc',
type:'string',
width:200,
},
{
caption:'requestStatus',
type:'string',
width:500,
},
];
let values = [];
data.forEach(value => {
values.push([value.key,
value.buyerKey,
value.buyerName,
value.invoiceNumber,
Math.round(value.amount).toString().replace(/(\d)(?=(\d\d)+\d$)/g, '$1,'),
value.id,
dateFormat(value.originalDueDate, 'dd-mmm-yy'),
dateFormat(value.generatedAtUtc, 'dd-mmm-yy'),
value.requestStatus,
]);
});
workSheet.rows=values;
download19.xlsx