eventlisterer-finder.js

    Array.prototype.slice.call(document.querySelectorAll('*')).reduce(
        (acc, el) => { 
            let listeners = getEventListeners(el);
            if(Object.keys(listeners).length) { 
                acc[el.nodeName + el.className] = (acc[el.nodeName + el.className] ?? 0) + Object.keys(listeners).length
            }; 
            return acc;
            }, 
        {}
    );