Conventional subscription API for DOM events. Subscriber returns an unsubscribe callback that once called, will detach the event handler.

index.js

// ...args: [event, handler, capture]
function onEvent(element, ...args) {
	element.addEventListener(...args);
  	return () => {
    	element.removeEventListener(...args);
    }
}

const form = $('#form');
const detachSubmit = onEvent(form, 'submit', submitForm});

// need to detach?
detachSubmit();