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For reasons that are not clear, this book was started in 2016 and is still not finished. Those people who paid for printed books have been left in the lurch and will justifiably be upset. It doesn't take 18 months to write a book of this length.

More importantly, the book contains a lot of outdated code. It's not enough to add an appendix covering React-Router 4: the entire section needs to be re-written. People buy a new book expecting to get up-to-date code, and don't want to confuse themselves learning something which needs to be unlearned later. With respect to React, you claim that 'version 16 came out right as this book was going to print'. It actually came out in September 2017. The code was tested on Node 6: node 8 is now the LTS version.

Don't expect good reviews.