I used Typescript from the get-go on a new project recently and it's slowed down both mine and my team's development velocity a lot. Time will tell if it's a smart decision but in terms of prototyping or spiking something, I'm picking Rails every time and I think based on my current experience I'd be apt to retrofit Typescript to an existing project rather than integrate it from the beginning. I don't suppose you could recommend any good resources for better learning Typescript? The docs are OK but if there's a book or anything you'd recommend, I'd certainly appreciate it.