[mattetti]

Progressive switch, we use TypeScript for new code and everything we touch old code, we try to convert from JS to TS. The tooling is amazing, even the skeptics in the team wouldn't go back to js now. Defining interfaces, using types really reduced the feedback loop and sped up our dev time. The one thing that is wish is that templates could verified by the compiler instead of waiting for runtime (react uses views written in code and therefore you get that for free when using react + TS)