text: module.exports = function (delta) {
      if(!delta) return "";
  
      const color = delta.isPositive ? "green" : "red";
  
      return "<span style='color:" 
          + color 
          + "'>("
          + (delta.isPositive ? "+" : "")
          + (delta ? delta.value : 0)
          + ")</span>";
  };