I think people on our team use VSCode, Sublime Text, and Vim. Almost all editors these days have good support for React, so we don't have any official one (nor do we feel the need to).
VSCode has particularly good integration with TypeScript, so perhaps choose it if you are otherwise undecided.
I’m not questioning typed JS, 100% behind that, we regrettably use flow, partly because React Native Typescript support wasn’t great (so I am told).
I guess I should have asked if FB recommended TS over flow nowadays
VSCode is also written in Typescript. I believe the teams work closely to ensure that new versions of TS are supported right away, and features are added to take advantage of them.
VSCode has particularly good integration with TypeScript, so perhaps choose it if you are otherwise undecided.