debounce.js

const debounce = (fn, time) => {
    let timerId = null
    return (...args) => {
        if (timerId) {
            clearTimeout(timeId)
        }
        timeId = setTimeout(() => {
	    fn(...args)
	}, time)
    }
}

input.addEventListener('keyup', debounce(e => console.log(e), 1000))