basedpyright を Homebrew, Nix でインストール

プロジェクトリンク

• ホームページ
• リポジトリ
• 上流ドキュメント
• パッケージマネージャページ

コマンドとエイリアス

• basedpyright
• basedpyright-langserver

プロジェクトの歴史

The official documentation describes basedpyright as a Pyright fork with type-checking improvements, Pylance features, and more. Its documentation site and README both point to the GitHub repository and organize the project around benefits over upstream Pyright.

The release stream tracks upstream Pyright closely. The latest documentation canonical URL observed for this batch was v1.39.9, and GitHub release metadata for v1.39.9 names the paired Pyright version as 1.1.411.

採用の歴史

basedpyright is distributed through several developer channels: PyPI, the Visual Studio Marketplace, Open VSX, Sublime Text Package Control, Homebrew, and Nix according to the README badges and input metadata. That spread reflects its role as both a CLI checker and language server.

A major adoption hook is that users can install it from PyPI without Node.js, while the VS Code extension uses the same version to avoid different diagnostics between editor and CLI.

使われ方

Users run basedpyright as a command-line type checker or basedpyright-langserver as an editor language server. Configuration follows Pyright-style project configuration in pyrightconfig.json or pyproject.toml.

The docs emphasize stricter defaults, new diagnostic rules, baseline support for adopting those rules in existing projects, and Pylance-like language-server behavior outside Microsoft's closed-source Pylance extension.

パッケージ好きにとっての重要性

basedpyright is important in package-manager culture because it repackages a Node-centered Python type checker as a Python-installable tool and aligns editor and CLI versions. That solves a real packaging pain point for Python projects that want type checking without a JavaScript toolchain.

It also shows a common modern fork pattern: take a successful corporate-backed open-source core, add stricter defaults and features withheld in a closed extension, and distribute it through every editor/package channel where Python developers already work.

タイムライン

• 2020s: basedpyright forked Pyright to add stricter checks, Pylance-like features, and packaging changes.
• 2020s: Documentation organized a Benefits over Pyright section covering baselines, better defaults, new diagnostics, and language-server improvements.
• 2026: v1.39.9 was published with Pyright 1.1.411 alignment according to GitHub release metadata.

Related projects

• Pyright is the upstream Microsoft type checker that basedpyright forks.
• Pylance is Microsoft's closed-source VS Code extension whose features basedpyright reimplements for wider editor use.
• Mypy, Pyre, and pytype are related Python static type checkers, but basedpyright's direct lineage is Pyright.

ソース

• https://docs.basedpyright.com/latest
• https://docs.basedpyright.com/latest/benefits-over-pyright/
• https://github.com/DetachHead/basedpyright#readme
• https://github.com/DetachHead/basedpyright/releases
• source_facts.package-manager