Still Hack and HVVM are open source and anyone who cares can use them.

Go was also created at Google and for Google first and foremost, but ended up wildly popular in general.

(React was also created at Meta and for Meta. Same with Pytorch.)

cmon. nobody in their right mind is using hack outside of Meta

at least single example in open source or in enterprise who is running Hack? haven't seen even one in 8 years

> which is especially useful when writing strongly-typed code to support variable payload structures in API calls.

I shouldn't be surprised, that's like the ideal scenario for PHP. So of course they added strong typing to it.

wow. no way... slack is on hack! is this toy project for them or some sub-system? hard to believe. interesting if this is true!

My point exactly.