RxJS Delegate

rxjs delegate, handles multiple events

function delegate(wrapper, selector, eventNames) {
	return Rx.Observable.from(eventNames.split(",")).mergeMap(eventName => {
		return Rx.Observable.fromEvent(
			wrapper,
			eventName.replace(/\s/g, ""),
			function (e) {
				return {event: e, delegate: e.target.closest(selector)};
			});
	}).filter(function (x) {
		return x.delegate !== null;
	});
}