Lots of things are happening there. As of today it’s the liveliest software ecosystem. The last time I’ve seen such an interesting gathering was 15 years ago in Java.
Fifteen years ago Java developers were looking down on the JavaScript folks. It was assumed that JavaScript was only good for highlighting menus and making an impression that the Web site is current by displaying a running clock on the page. Mobile phones still had buttons with one digits and three letters. There were no App stores. Java was promising “Write once run everywhere”, but now we can see that JavaScript actually delivered on this promise.