You should learn how to monetize your skills and avoid being judged or scored by any employer. Your bonus could be much higher.

I can't quite figure out what you are getting it. It sounded like you were suggesting OP consider freelancing. But then you suggest his/her bonus could be much higher.

How would one earn a very high bonus while not being judged or scored by any employer?

how about some more core Javascript

https://github.com/getify/You-Dont-Know-JS

Solid chapter on asynchrony! I really find the "Review" section at the end to be useful and tying concepts together. Yeah, I need to learn more core JavaScript.

If you haven't done much on the backend (databases, web servers, server-side web frameworks, etc.), then taking some time to familiarize yourself with what is going on there might be worth it. Even if you don't end up doing any work on the backend, you will have a better understanding of what is going on. I would start with the technologies in use at your current company.

Edit: clarification

Tools are temporary, foundations are timeless.

You might be already doing this with your React/Webpack, but picking up some ES6 might be a good thing to do.

I've slowly been adding some ES6 into my code and there are some really nice things.

I concur with TurboHaskai, stop worrying about the next hot thing, focus on building solid applications that are flexible, maintaining, user friendly and solves a business problem.

Swift -- but not just on client side, Swift on server side.

Functional Programming.

The language does't matter but learning the concepts challenges you to think in different terms.

I second that. Learn Clojure! =)

React

How has React been for you? Have you had to rewrite a Rails or PHP app in React?

Are you using React in production, or limited to side projects?

Babel