onSlide
onSlide method allows you to subscribe to the slide event
Example
const blazeSlider = new BlazeSlider(el, options?)
// subscribe to the slide event
const unsubscribe = blazeSlider.onSlide(
  (pageIndex, firstVisibleSlideIndex, lastVisibleSlideIndex) => {
    // index of the current page ( pagination index )
    console.log(pageIndex);
    // first and last visible slide index
    console.log(firstVisibleSlideIndex, lastVisibleSlideIndex);
  });
// when you want to unsubscribe - call the returned `unsubscribe` function