The last large project I added Typescript, it took several weeks to add types. It took another year to learn how to write code in a way that is more likely to b

The last large project I added Typescript, it took several weeks to add types. It took another year to learn how to write code in a way that is more likely to be successful in Typescript. If you have a ton of state, classes, high coupling and a lot of variance in your data structures (which Javascript really easily allows), Typescript is not an instant game-changer. This is not that different from having good test coverage is easier during development than adding it later, as you will end up writing your code in a way that makes things more decoupled and testable. It was way easier to get to that sweet spot with our Node.js code vs. our React code. React code is still more of a battle than non-React code, although functional components has made this better. Class based components suck the most and we just opt for using "any" instead of fighting it. Don't get me started about HoC.