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providing IDE features like code completion, diagnostics, and go-to-definition with multi-editor support.",{"description":543,"readmeHtml":544},"Pyrefly is a fast Python type checker and language server written in Rust by Meta, serving as the default checker for Instagram's 20-million-line codebase.","\u003Ch2 id=\"project-overview\">Project Overview\u003C\u002Fh2>\u003Cp>Pyrefly is an open-source Python type checker and language server from Meta, written in Rust. It checks over 1.85 million lines of code per second, type checking projects like PyTorch 15x faster than Mypy and Pyright. It is the default type checker for Instagram's 20-million-line Python codebase and is adopted by large open-source projects including PyTorch and JAX. Beyond the CLI, it offers extensions for VS Code, Neovim, Zed, and more.\u003C\u002Fp>\n\u003Ctable>\n\u003Cthead>\n\u003Ctr>\n\u003Cth>Item\u003C\u002Fth>\n\u003Cth>Value\u003C\u002Fth>\n\u003C\u002Ftr>\n\u003C\u002Fthead>\n\u003Ctbody>\u003Ctr>\n\u003Ctd>Developer\u003C\u002Ftd>\n\u003Ctd>Meta\u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003Ctr>\n\u003Ctd>Language\u003C\u002Ftd>\n\u003Ctd>Rust\u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003Ctr>\n\u003Ctd>Status\u003C\u002Ftd>\n\u003Ctd>Stable (1.0+)\u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003Ctr>\n\u003Ctd>License\u003C\u002Ftd>\n\u003Ctd>MIT\u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003C\u002Ftbody>\u003C\u002Ftable>\n\u003Cblockquote>\n\u003Cp>Fast type checking proven on industrial-scale codebases.\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch2 id=\"key-features\">Key Features\u003C\u002Fh2>\u003Cul>\n\u003Cli>\u003Cstrong>Extremely fast\u003C\u002Fstrong>: over 1.85 million lines per second; rechecks after saving usually finish in under 10 milliseconds\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Full-featured language server\u003C\u002Fstrong>: navigation, autocomplete, hover info, inlay hints, semantic highlighting\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Understands frameworks\u003C\u002Fstrong>: built-in Pydantic, Django, and pytest support with model validation and fixture navigation out of the box\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Migration toolkit\u003C\u002Fstrong>: \u003Ccode>pyrefly init\u003C\u002Fcode> to move from Mypy\u002FPyright and \u003Ccode>pyrefly suppress\u003C\u002Fcode> to silence existing errors\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Type inference\u003C\u002Fstrong>: \u003Ccode>pyrefly infer\u003C\u002Fcode> generates type annotations automatically\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Editor integrations\u003C\u002Fstrong>: VS Code, Neovim, Zed, and more\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Consistent results\u003C\u002Fstrong>: the CLI and your editor agree on findings\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2 id=\"target-audience\">Target Audience\u003C\u002Fh2>\u003Cul>\n\u003Cli>Python developers\u003C\u002Fli>\n\u003Cli>Large codebase maintainers\u003C\u002Fli>\n\u003Cli>Teams migrating from Mypy or Pyright\u003C\u002Fli>\n\u003Cli>Projects using Pydantic or Django\u003C\u002Fli>\n\u003Cli>Heavy users who value instant IDE feedback\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2 id=\"quick-start\">Quick Start\u003C\u002Fh2>\u003Col>\n\u003Cli>Install the command-line tool\u003C\u002Fli>\n\u003C\u002Fol>\n\u003Cdiv class=\"code-block\">\u003Cpre>\u003Ccode class=\"hljs language-bash\">pip install pyrefly\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Col start=\"2\">\n\u003Cli>Initialize project configuration\u003C\u002Fli>\n\u003C\u002Fol>\n\u003Cdiv class=\"code-block\">\u003Cpre>\u003Ccode class=\"hljs language-bash\">pyrefly init\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Col start=\"3\">\n\u003Cli>Run type checking\u003C\u002Fli>\n\u003C\u002Fol>\n\u003Cdiv class=\"code-block\">\u003Cpre>\u003Ccode class=\"hljs language-bash\">pyrefly check\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Col start=\"4\">\n\u003Cli>With many legacy errors, silence them via suppress and address them gradually\u003C\u002Fli>\n\u003C\u002Fol>\n\u003Ch2 id=\"core-advantages\">Core Advantages\u003C\u002Fh2>\u003Cul>\n\u003Cli>\u003Cstrong>Proven at scale\u003C\u002Fstrong>: production use on a 20-million-line codebase at Instagram\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Leading speed\u003C\u002Fstrong>: over an order of magnitude faster than mainstream checkers\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Adoption friendly\u003C\u002Fstrong>: init, suppress, and infer make gradual migration easy\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Real-world frameworks\u003C\u002Fstrong>: built-in framework understanding reduces false positives\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch2 id=\"system-requirements\">System Requirements\u003C\u002Fh2>\u003Ctable>\n\u003Cthead>\n\u003Ctr>\n\u003Cth>Item\u003C\u002Fth>\n\u003Cth>Requirement\u003C\u002Fth>\n\u003C\u002Ftr>\n\u003C\u002Fthead>\n\u003Ctbody>\u003Ctr>\n\u003Ctd>OS\u003C\u002Ftd>\n\u003Ctd>Linux, macOS, Windows\u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003Ctr>\n\u003Ctd>Runtime\u003C\u002Ftd>\n\u003Ctd>Python (for pip install)\u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003Ctr>\n\u003Ctd>Editors\u003C\u002Ftd>\n\u003Ctd>VS Code, Neovim, Zed, and more\u003C\u002Ftd>\n\u003C\u002Ftr>\n\u003C\u002Ftbody>\u003C\u002Ftable>\n\u003Ch2 id=\"notes\">Notes\u003C\u002Fh2>\u003Cul>\n\u003Cli>\u003Cstrong>Version policy\u003C\u002Fstrong>: not strict semantic versioning; upgrades may introduce new type errors\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Suppressions\u003C\u002Fstrong>: after upgrading, use \u003Ccode>pyrefly suppress\u003C\u002Fcode> to handle newly reported errors in bulk\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Release cadence\u003C\u002Fstrong>: minor versions ship monthly, with patch releases for critical fixes\u003C\u002Fli>\n\u003C\u002Ful>\n",1793197853325]