I didn’t take his JS course, neither did I take any Node.js course but I basically know what it is.
I took Mosh’s React course though. I can tell you there is a part with the essentials of ES6. I just checked the JS course curriculum and you know way more than what is presented in React course.
It was created so that you do not need prior knowledge of JS (because of the ES6 refresher part I told above).
Like many of Mosh courses though the content is a bit outdated and many complains about it. But it is still relevant.
Overall you can easily overcome problems you may meet but there is one that had me ask and the answer was actually in the next video.
You will have a circular reference between services you’ll make. At that point just watch the next video.