JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="//cdn.jsdelivr.net/jquery.slick/1.6.0/slick.css">
<script src="//cdn.jsdelivr.net/jquery.slick/1.6.0/slick.min.js"></script>
<div class="slider">
  <div>111</div>
  <div>222</div>
  <div>333</div>
</div>

<div class="count"></div>

JavaScript

$('.slider').slick();

$('.slider').on('beforeChange', function(event, slick, currentSlide, nextSlide){
  $('.count').text(currentSlide);
});