Scans an object tree looking for references to Windows or DOM Nodes. TODO: handle stack overflows, function scope?

FindWindowReferences.js

var isWindowOrNode = function (obj, callback, callbackArg) {
	var result = false;
	if (obj != null) {
		if (obj instanceof Window) {
			callback(obj, callbackArg);
			result = true;
		} else if (obj instanceof HTMLDocument) {
			callback(obj.defaultView, callbackArg);
			result = true;
		} else if (obj instanceof HTMLElement) {
			callback(obj.ownerDocument.defaultView, callbackArg);
			result = true;
		}
	}
	return result;
};

var logWindowInfo = function(window, propName) {
	console.log(propName + ' references window ' + window.name);
};

var findWindowRefs = function (obj, keyFilter, _parentKey) {
	var propName = _parentKey === undefined ? '' : _parentKey
		winOrNode = isWindowOrNode(obj, logWindowInfo, propName);
	if (!winOrNode && ((typeof obj) === 'object')) {
		Object.keys(obj).forEach(function (key) {
			var fqKey = propName === '' ? key : propName + '.' + key,
				val;
			if (!keyFilter || (keyFilter && keyFilter(key, fqKey))) {
				try {
					val = obj[key];
				} catch (e) {
					console.log('unable to read value of ' + fqKey);	
				}
				if (val != null) {
					findWindowRefs(val, keyFilter, fqKey);
				}
			}
		});
	}
};