//domEventPromise
{
    let knopka = document.createElement('button')
    knopka.innerText='Кнопка'
    document.body.append(knopka)
    function domEventPromise(element, eventName) {
        function executor(resolve) {
            function handler(event) {
                element.removeEventListener(eventName, handler);
                resolve(event);
            }
            element.addEventListener(eventName, handler);
        }
        return new Promise(executor);
    }
    domEventPromise(knopka, 'click').then(e => console.log('event click happens', e));
}