Mastodon is written in Ruby. Nowhere near as big as Facebook or the ML field yet

FTFY ;)

Like I said in my other replies: I am not attempting to skirt around JS. If TS is a superset of JS, it would obviously make no sense to try to avoid JS. What I’m looking for is a book/tutorial/… that is structured in a way that it teaches the most important parts the way they are used in TS (including JS) first.

Example: when functions are taught it would explain the basics of JS functions along with the parameter type annotations of TS, because that’s the way functions are used in TS.

Please see my other replies.

Yes, and I would like to learn the tightened up version rightaway ;-) When I want to learn e.g. about functions, I want to have a chapter “Fundamentals of functions” or something (and probably another chapter for advanced stuff about functions, edge cases etc.). Right now it seems like I would have to first read about functions in a JS book without knowing how they will be used best in TS). And then I would take another book and read about the modifications that TS makes to them.

I get that in order to “fully understand” TS I need to “fully understand” JS. But in the beginning I would like something that explains the core concepts of TS (which of course may and often will include JS concepts).

I know TS doesn’t remove that much from JS, but I expect the typing, structuring etc. to prevent some behavior that can occur in JS - otherwise what would be the point of e.g. the typing system? So that are the parts I don’t need to learn (at least not at first).

I think an important point for me is that I’d rather learn “from a TS perspective”, that is starting with best practices and common use cases as they appear in a TS environment. Right now it sounds to me that the usual way would be to read some JS book, where I learn e.g. about functions or objects. And then I would read another book with all the modifications that TS makes to e.g. functions or objects.

Yes, that I need to learn some amount of Javascript is a given. But I would rather not learn some JS aspects that I won’t need anyway, because TS prevents me from using them or has other best practices.