JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdn.jsdelivr.net/kefir/3.1.0/kefir.js"></script>
<button id="btn1">Click me twice or more</button>
<span id="output"></span>

JavaScript

var rawClicks = Kefir.fromEvents(document.querySelector('#btn1'), 'click');
var result = rawClicks.bufferBy(rawClicks.debounce(500));

result.onValue(function(events) {
  document.querySelector('#output').innerHTML = events.length + 'x clicks';
});