"Python typing got fast enough to feel invisible. Pyrefly is a new, open source type checker and IDE language server from Meta, written in Rust, with a focus on instant feedback and real-world DX. Today, we will dig into what it is, why it exists, and how it plays with the rest of the typing ecosystem. We have Abby Mitchell, Danny Yang, and Kyle Into from Pyrefly here to dive into the project."
"Pyrefly = fast type checker plus full IDE language server, built in Rust Pyrefly is both a static type checker and a language server designed together from day one. It targets instant feedback in editors and CI and works cross platform, including Windows. The project is open source and currently in an active alpha with weekly releases. Why speed matters: IDE feel and developer flow Speed matters most while typing and navigating."
Pyrefly is a Rust-based, open-source project that combines a static Python type checker with a full IDE language server to provide instant feedback in editors and CI. The project targets real-world developer experience and cross-platform support, including Windows, and is in active alpha with weekly releases. A developer advocate maintains weekly release notes and works with community contributors. One engineer focuses on the type checker implementation while another focuses on the IDE and language-server experience, leveraging experience from Pyre. The project emphasizes low-latency responses so editor features like go-to-definition feel immediate and supports gradual typing and inference for lightly annotated codebases.
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