Flow gets a good amount of the way there; it doesn't have quite the tooling of TypeScript but VSCode is actually able to bring a lot of that tooling to a Flow-t

Flow gets a good amount of the way there; it doesn't have quite the tooling of TypeScript but VSCode is actually able to bring a lot of that tooling to a Flow-typed codebase. Just yesterday I finished a major refactor that I'm not even sure I'd have attempted if we weren't using Flow. One giant action file feeding three insane reducers – yet I'm confident (with some testing) that it'll still work when I deploy today.