facebook/pyrefly：README 來源編輯指南

facebook/pyrefly 的 README 將專案描述為「A fast type checker and language server for Python」。本文只整理倉庫可直接核對的內容，不把 star、Fork 或宣傳語當成品質證明。README 在「Pyrefly: A fast type checker and language server for Python with powerful IDE features」下寫到：Pyrefly is a type checker and language server for Python, which provides lightning-fast type checking along with IDE features such as code navigation, semantic highlighting, and code completion. It is available as a command-line tool.。這說明的是專案邊界，不是已完成的生產驗證。

從 README 的「Key Features」與相關條目，可以先判斷它是否處理你的實際問題：Production-proven at scale. Pyrefly is the default type checker for Instagram's 20-million-line Python codebase at Meta, and has been adopted by large open source projects including PyTorch and JAX.。若需求不同，不應只因專案熱度就採用。本文保留原始專案名、命令與元件名，方便回到一手來源核對。 README 另外列出一項可核對的資訊：Fast. Pyrefly checks over 1.85 million lines of code per second, type checking projects like PyTorch 15x faster than Mypy and Pyright. In the IDE, rechecks typically complete in under 10 milliseconds after saving a file.。這類原文條目可用來設計試跑步驟，但不能取代實際環境測試。

README 將運作方式分散在「Pyrefly: A fast type checker and language server for Python with powerful IDE features」等段落。可確認的線索包括：Pyrefly's current development status is stable.。本文不把未寫出的架構、效能或安全邊界補成結論；真正的執行鏈仍要配合目錄、設定檔與版本標籤檢查。

第一次安裝應從 README 指出的入口開始。目前可核對的命令是： README 没有给出可直接复制的安装命令。 如果倉庫沒有命令，本文不會自行編造步驟，而是建議先閱讀「Key Features」，確認系統依賴、預設埠與首次初始化。

日常使用取決於專案文件。README 的「Version Policy」段落提到：Pyrefly releases new minor versions (1.x.0) monthly and patch versions in between as-needed for critical fixes. Pyrefly does not follow strict semantic versioning: minor versions contain more significant changes than patch versions, but。設定檔、環境變數、權限與資料目錄只在來源明確時才會記錄；沒有寫出的預設值，應在測試環境驗證並保留回滾副本。 同一部分也提到：Full-featured language server. Code navigation, autocomplete, hover information, inlay hints, semantic highlighting, and more, with consistent results across the CLI and your editor of choice.。