How to set cell width when export .xlsx files with js-xlsx

Question

I am trying to set a fixed column/cell width to my exported excel files with js-xlsx.

EDIT:

Here is the source of js-xlsx: https://github.com/SheetJS/js-xlsx

Answer 1

I used @Icycool 's answer as great example. I also upvoted that one as it was very useful for me.

I enhanced it a bit with a configurable default width if the content is smaller than the title and added a buffer so that it doesn't look crammed together.

Added comments and expanded to increase readability

 return Object.keys(dataSource[0][0]).map((key) => {
  return ({
    //pick the data value that has the most content
    wch: Math
      .max(...dataSource[0]

        //Iterate over the column object and return a width for each one
        .map((dataObj: any) => {

          //Return the width as the number of chars with a buffer
          let keyWidth = key.toString().length
          let width = dataObj[key]?.toString().length ?? defaultColumnWidth
          width = width + columnWidthBuffer

          //use a default with if it's smaller than the title
          if (width < keyWidth) {
            width = keyWidth
          }
          return width
        })
      )
  })
});