Wrapper for addEventListener(), allow to set callback for NodeList, single element, and by selector string

addListener.js

function addListener(what, cbk, action, deferred, deferred_listener, onAddCallback){
    var what = what || false;
    var cbk = cbk || false;
    var action = action || 'click';
    var deferred = deferred || false;
    var deferred_listener = deferred_listener || document.documentElement;
    var onAddCallback = onAddCallback || false;

    if (!action){
        action = 'click'; // тут не уверен, если пробросим false или null как будет себя вести, потому такая доп. проверка
    }

    if (what && cbk){
        if (typeof what === 'string'){

            if (deferred){
                if (typeof deferred_listener === 'string'){
                    deferred_listener = document.querySelector('deferred_listener');
                } else if (deferred_listener instanceof HTMLElement){
                    //deferred_listener = deferred_listener;
                } else {
                    deferred_listener = false;
                }

                // проверяем наличие
                if (!deferred_listener){
                    deferred_listener = document.documentElement;
                }

                // назначаем
                deferred_listener.addEventListener(action, function(e){
                    if (e.target.closest(what)){
                        cbk(e);
                    }
                });

            } else {
                var el = document.querySelectorAll(what);
                var length = el.length;
                if (length){
                    for (var i = 0; i < length; i++){
                        el[i].addEventListener(action, cbk);
                        if (onAddCallback){
                            onAddCallback(el[i]);
                        }
                    }
                }
                return el;
            }

        } else if (what instanceof HTMLElement){

            what.addEventListener(action, cbk);
            if (onAddCallback){
                onAddCallback(what);
            }
            return [what]; // вернём просто массив - не NodeList

        } else if (what instanceof HTMLCollection){

            var length = what.length;
            if (length){
                for (var i = 0; i < length; i++){
                    what[i].addEventListener(action, cbk);
                    if (onAddCallback){
                        onAddCallback(what[i]);
                    }
                }
            } else {
                console.log('addListener(): передан пустой NodeList, ничего не назначено');
                return what;
            }

        }
    } else {
        if (!cbk){
            console.log('addListener(): коллбэк не передан');
        }
        if (!what){
            console.log('addListener(): не передан ни селектор, ни элементы');
        }
        return new Array();
    }
}

function addListener(what,cbk,action,deferred,deferred_listener,onAddCallback){what=what||!1,cbk=cbk||!1,action=action||"click",deferred=deferred||!1,deferred_listener=deferred_listener||document.documentElement,onAddCallback=onAddCallback||!1;if(action||(action="click"),!what||!cbk)return cbk||console.log("addListener(): коллбэк не передан"),what||console.log("addListener(): не передан ни селектор, ни элементы"),new Array;if("string"==typeof what){if(!deferred){var el=document.querySelectorAll(what);if(length=el.length)for(var i=0;i<length;i++)el[i].addEventListener(action,cbk),onAddCallback&&onAddCallback(el[i]);return el}"string"==typeof deferred_listener?deferred_listener=document.querySelector("deferred_listener"):deferred_listener instanceof HTMLElement||(deferred_listener=!1),deferred_listener||(deferred_listener=document.documentElement),deferred_listener.addEventListener(action,(function(e){e.target.closest(what)&&cbk(e)}))}else{if(what instanceof HTMLElement)return what.addEventListener(action,cbk),onAddCallback&&onAddCallback(what),[what];if(what instanceof HTMLCollection){var length;if(!(length=what.length))return console.log("addListener(): передан пустой NodeList, ничего не назначено"),what;for(i=0;i<length;i++)what[i].addEventListener(action,cbk),onAddCallback&&onAddCallback(what[i])}}}