flow vs. TS? Do you need them for React?

Question

typescript

Hello everyone
On upworks, more and more often they began to require knowledge of TS and / or Flow. Yesterday I saw this creation for the first time. That is, this is a new syntax, new subsets in webpack, and so on. React has not yet been fully mastered. Should I be distracted by Flow/TS now, and if so, what should I choose? It seems like TS is more popular, but Flow is made by Facebook, that is, the creator of React (is there some kind of ecosystem there?).
Thanks

Answer 1

Flow is user-friendly and minimalist*, I enjoy working with it. It helps to write code "a little stricter", in total, in a bunch of eslint + flow, you get clean and "stable" code. In addition to this, many editors immediately highlight what is wrong.
* - minimalistic, it seems so to me compared to TS. TS needs to be dealt with longer than with Flow, although this opinion may be erroneous, since I actively use flow, but did not work with TS.

Answer 2

Do not forget about the fundamental difference. TypeScript is another language that can now be compiled into Javascript.
Where this language will lead Microsoft is a difficult question.