flow VS node-lru-cache

It's not as popular as typescript but not dead, it's consistently active [0] for a decade.

[0] https://github.com/facebook/flow/graphs/contributors

One alternative that I found was flow, thought haven't used it. There is a bevy of languages that transpiles to JS, though some seemingly lost their attention over time. Can the bridge to WASM contribute to this or is that digressing from the topic?

I think you are mistaking Flow unmaintained for Flow actively maintained.

Hack and Flow are also written in OCaml.

So... you're referring to flow?

It seems like Facebook doesn't have problem with releasing open source project [0] while keeping centralised control over it.

[0] https://github.com/facebook/flow

Facebook uses OCaml professionally, for [Flow](https://github.com/facebook/flow), their typechecker for JavaScript, and [Pyre](https://github.com/facebook/pyre-check), their typechecker for Python.

Personally love the type system and its relationship with the dev. tools; feel naked without the dealing with the compiler's panic attacks by now. Several influential libraries and packages (babel, caches, sentry, to name a few from the many) seemingly bolted the superset into their backbone so far. Also read dev. logs from people and companies like AirBnB who claim that the TypeScript was a good influence for productivity and documentation to their codebases.