https://engineering.fb.com/2025/05/15/developer-tools/open-sourcing-pyrefly-a-faster-python-type-checker-written-in-rust/
Open-sourcing Pyrefly: A faster Python type checker written in Rust - Engineering at Meta
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https://www.opensourceforu.com/2025/11/meta-open-sources-pyrefly-beta-with-95-faster-python-type-checking/
Meta Open Sources Pyrefly Beta With 95% Faster Python Type-Checking - Open Source For You
Nov 25, 2025 - Meta has released Pyrefly as an open source Beta, offering up to 95% faster type-checking and inviting global developers to contribute to the future of Python
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