I think the question is will the time spent reading this book increase my productivity (or perceived productivity, if that is what you're after) more than the time it took to read the book. There are definitely books that will make you more productive. I believe this because I've read hooks which have helped me a lot. A lot can be learned from Stack overflow but sometimes a book is needed to explain a topic in depth. I think this was the case for me with learning about how to write thread safe code, where Java Concurrency in Practice helped. I do not know many JavaScript books but I'm sure they exist. On the other hand some books you may not learn much from or will take longer to read than you'll get back in productivity.
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I think the question is will the time spent reading this book increase my productivity (or perceived productivity, if that is what you're after) more than the time it took to read the book. There are definitely books that will make you more productive. I believe this because I've read hooks which have helped me a lot. A lot can be learned from Stack overflow but sometimes a book is needed to explain a topic in depth. I think this was the case for me with learning about how to write thread safe code, where Java Concurrency in Practice helped. I do not know many JavaScript books but I'm sure they exist. On the other hand some books you may not learn much from or will take longer to read than you'll get back in productivity.