Very simple and functional keyboard listener sinppet

index.js

class KeyListener {
    constructor(obj ,element = window){
        element.addEventListener('keyup', this.keyUp.bind(this), false);
        element.addEventListener('keydown', this.keyDown.bind(this), false);
        this.elememt = element
        this.keys = {}
        for(let key in obj){
            this.keys[key] = {
                isDown:false,
                press:obj[key].press,
                release:obj[key].release
            }
        }
    }
    keyUp(e){
        if(this.keys[e.code] && this.keys[e.code].isDown){
            e.preventDefault()
            this.keys[e.code].isDown = false
            this.keys[e.code].release && this.keys[e.code].release(e)
        }
    }
    keyDown(e){
        if(this.keys[e.code] && ! this.keys[e.code].isDown){
            e.preventDefault()
            this.keys[e.code].isDown = true
            this.keys[e.code].press && this.keys[e.code].press(e)
        }
    }
    detach(){
        this.elememt.removeEventListener('keydown',this.keyDown,false)
        this.elememt.removeEventListener('keyup',this.keyUp,false)
    }
}