Pyrefly
Open-source Python type checker and language server written in Rust by Meta.
0 members list Pyrefly, unchanged over the last 12 weeks, data as of 27 October 2026
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- Type Server Protocol: what it adds over LSP, and which slot it takes in a Python type checking stack
The Type Server Protocol lets Pylance in VS Code ask Pyright or Pyrefly for Python types as data. Version 0.4.1 changes the editor, not CI.