Run this code in an html script with an index element in the body, type anything into the input and see an alert after two seconds of inactivity

pureBounce.js

const debounce = (callback, wait) => {
  let timeout = null
  return (...args) => {
    const next = () => callback(...args)
    clearTimeout(timeout)
    timeout = setTimeout(next, wait)
  }
}

const inputEl = document.getElementsByTagName('input')[0]
inputEl.addEventListener('input', debounce(e => alert(`value updated: ${ e.target.value }`), 2000))