> I think it was the combination of Flow being from Facebook, and the “no build step/its just JS with annotations” thing which people made a big deal out of, bu

> I think it was the combination of Flow being from Facebook, and the “no build step/its just JS with annotations” thing which people made a big deal out of, but I never saw as a big differentiator. I put quite some time into evaluating Flow vs Typescript around 2016, and preferred Flow mostly because its type checking was more correct, and its bugs more straightforward. Typescript would happily compile all sorts of incorrect code even with its strictest configs, it was insane. I eventually found my happy place with Scala.js.