Comment by team_pyrefly

Comment by team_pyrefly a day ago

Hi folks, I work on the Pyrefly team at Meta. Our FAQ covers a good number of the questions raised here: https://pyrefly.org/en/docs/pyrefly-faq/. I can also try to answer some of your questions. Thanks for taking a look!

muglug 18 hours ago

At Slack we have an internal Rust-based Hack typechecker that’s about 20% faster than the OCaml one (we use both)

Did you see better speedups over Pyre? Aka did I leave stuff on the table…

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samwgoldman 6 hours ago

Hack is quite a bit more optimized than Pyre was, but Pyrefly is at least 10x faster than Pyre on the IG codebase.
I didn’t know about the Rust-based Hack checker— that’s really cool!

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