message: let to const, tab removed
diff: @@ -81,7 +81,7 @@ export default class Gallery extends Component {
  return viewportWidth - layerWidth;
  case 'center':
  if (this.isCenterWithCustomWidth && slides.length) {
  - let { coordX, width } = slides[slides.length - 1];
  + const { coordX, width } = slides[slides.length - 1];
  return (viewportWidth / 2) - coordX - (width / 2);
  } else {
  return viewportWidth - (containerWidth - viewportWidth) / 2 - layerWidth;
  @@ -91,7 +91,7 @@ export default class Gallery extends Component {
  calcMax ({ viewportWidth, slides }) {
  if (this.isCenterWithCustomWidth && slides.length) {
  - let { width, coordX } = slides[0];
  + const { width, coordX } = slides[0];
  return (viewportWidth / 2) - coordX - (width / 2);
  } else {
  return 0;
  @@ -110,10 +110,10 @@ export default class Gallery extends Component {
  return 0;
  }
  - let targetSlide = slides.length ? slides[targetIndex] : null;
  + const targetSlide = slides.length ? slides[targetIndex] : null;
  if (targetSlide) {
  - let { coordX, width } = targetSlide;
  + const { coordX, width } = targetSlide;
  if (this.isCenterWithCustomWidth) {
  const viewportWidth = this.viewport.offsetWidth;
  