Meta Open Sources Pyrefly: A Rust-Powered Python Type Checker

Meta has released an alpha version of Pyrefly, an open-source Python type checker and IDE extension built in Rust. Pyrefly aims to improve type consistency in Python code, helping catch errors early before runtime. It supports IDE integration and CLI usage, prioritizing performance and type inference, working effectively even on unannotated code. Evolving from Meta's Pyre, Pyrefly strives to be a more powerful and extensible type checker, collaborating with the Python community to improve the Python type system.