const reader = new FileReader()
reader.onload = (event) => {
  const data = event.target?.result
  if (data instanceof ArrayBuffer) {
    const workbook = new ExcelJS.Workbook()
    workbook.xlsx
      .load(data)
      .then(() => {
        const worksheet = workbook.getWorksheet(1)
        // ...
        resolve(true)
      })
      .catch((err) => {
        console.error('Error loading file data.', err)
        resolve(false)
      })