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Without a preview of what’s inside the book, it seems kind of strange to just spend $35

I don't disagree, the author should have included the current table of contents on the Shopify page (or anywhere really).

There is a short description here: https://youtu.be/f3Cn0CGytSQ?t=37

The code examples for each of the chapters are on GitHub here: https://github.com/jherr/no-bs-ts