simple implementation debounce

debounce.js

function debounce(fn, wait) {
  let cancelId = null
  const hasWait = Number.isSafeInteger(wait)
  const [timer, cancel] =
    hasWait
      ? [setTimeout, clearTimeout]
      : [requestAnimationFrame, cancelAnimationFrame]
  return function debounced(...args) {
    cancel(cancelId)
    cancelId = timer(fn.bind(this, ...args), wait)
  }
}