If you're a React programmer, this book is for you. I aim to show you how TDD can improve your work.
If you're already knowledgeable with TDD, I hope there's still a lot you can learn from comparing your own process with mine.
If you don't know already know React, you will benefit from spending some time running through the Getting Started guide on the React website. That being said, TDD is a wonderful platform for explaining new technologies, and it's entirely plausible that you'll be able to pick up React simply by following this book.
This book covers in-depth usage of React hooks, which are very new at the time of writing. If you're a React developer and hoping to learn how to use React without classes, then you will indeed learn that by reading this book.