Even though I've been using TypeScript for a number of years in Angular, Vue and even React, I felt like I needed some leveling up to say I was a Pro.
This book delivered the skills and then some. It brought you along slowly introducing you to the things you need in order to level up your skills.
One thing I could have done without was the last 6 chapters that went through adding TypeScript to Angular (which it is the default), Vue and React. I feel like these could be shorter or even removed in favor a few paragraphs perhaps.