code: function calculateTextStyle(helper, item)
  {
      if (item instanceof TextStyle)
      {
          const font = item.toFontString();
  
          TextMetrics.measureFont(font);
  
          return true;
      }
  
      return false;
  }
docs: Built-in hook to calculate a text style for a PIXI.Text object.
  
  @private
  @param {PIXI.Renderer|PIXI.CanvasPrepare} helper - Not used by this upload handler
  @param {PIXI.DisplayObject} item - Item to check
  @return {boolean} If item was uploaded.