Facebook has not made any meaningful changes in its OSS strategy. It has always been the case that it takes energy to maintain projects in OSS and that for projects that are not used much by external folks it might not be worth the energy.
However, we are continuing to develop React with OSS as a first class citizen, doubling down on our investment in React Native in open source, and likely to still open source new projects as they make sense.
VSCode has particularly good integration with TypeScript, so perhaps choose it if you are otherwise undecided.
But it is another tool for large codebases that requires more work, like tests. If it's a small web project, it's probably overkill.
It still needs your requisite that contribs are of high quality.