[andreygrehov]

Thanks a lot. This is helpful. I know that you better not avoid type checking, but just curious, when it comes to 3rd party non-TS libraries, I suspect a definition file is just a beneficial option and you can still live without it, is this correct?

[matchbok]

Correct. Most popular libraries have them, though. Even if they aren't TS.

Speeds up development a lot when you have them, though!