text: class SheetUtils {
    static columnToLetter (columnNumber) {
      let temp = ''
      let letter = ''
      while (columnNumber > 0) {
        temp = (columnNumber - 1) % 26
        letter = String.fromCharCode(temp + 65) + letter
        columnNumber = (columnNumber - temp - 1) / 26
      }
      return letter
    }
  }
  
  module.exports = SheetUtils
  