code: function () {
  		var bBox = this.labelBBox, // assume getLabelSize has run at this point
  			axis = this.axis,
  			options = axis.options,
  			labelOptions = options.labels,
  			width = bBox.width,
  			leftSide = width * { left: 0, center: 0.5, right: 1 }[axis.labelAlign] - labelOptions.x;
  
  		return [-leftSide, width - leftSide];
  	}
docs: Find how far the labels extend to the right and left of the tick's x position. Used for anti-collision
  detection with overflow logic.