code: function(delta) {
      var color = "green";
  
      if (delta > 0) {
        delta = "+" + delta;
        color = "red";
      } else if (!delta) {
        delta = delta === 0 ? "=" : "?";
        color = "grey";
      }
  
      return chalk[color](delta);
    }
docs: Color-coded size difference