As used in here https://codepen.io/onurkerimov/pen/aQJeyg

debounce.js

window.addEventListener("mousemove", function(e) {
  debounce(200, fn.bind(this,e))
});

var waitFlag = false

function debounce(time,fn) {
  if (!waitFlag) {
    fn()    
    waitFlag = true
    setTimeout(function() {
      waitFlag = false
    }, time)   
  }
}

function fn(e) {
  // Something computationally expensive
}