index.js

/*
* this module observe parameters of w object .
* screenLeft, screenTop, innerWidth, innerHeight
* if one of this parameters was changed module dispatch CustomEvent "moveOrResize"
*/
module.exports = function(w){
    if(!w._moveOrResizeObserver){
        w._moveOrResizeObserver = true;

        var oldX = w.screenLeft,
            oldY = w.screenTop,
            oldWidth = w.innerWidth,
            oldHeight = w.innerHeight;

        var interval = setInterval(function(){
            if(w.closed && interval){
                clearInterval(interval);
                interval = null;
                return;
            }

            if(oldX !== w.screenLeft || oldY !== w.screenTop || oldWidth !== w.innerWidth || oldHeight !== w.innerHeight){
                w.dispatchEvent(new CustomEvent('moveOrResize'));
            }

            oldX = w.screenLeft;
            oldY = w.screenTop;
            oldWidth = w.innerWidth;
            oldHeight = w.innerHeight;
        }, 500);
    }
};