lsp-mode client for the Pyrefly Python type checker.

This package is a fork of lsp-pyright.

• Emacs 28.1+
• lsp-mode
• Pyrefly installed and available on PATH

Install Pyrefly:

pip install pyrefly
# or
uv pip install pyrefly

(use-package lsp-pyrefly
  :ensure t
  :hook ((python-mode python-ts-mode) . lsp-deferred))

(require 'lsp-pyrefly)
(add-hook 'python-mode-hook #'lsp-deferred)
(add-hook 'python-ts-mode-hook #'lsp-deferred)

Pyrefly is configured via pyrefly.toml or [tool.pyrefly] in pyproject.toml. See the Pyrefly configuration docs.

All standard LSP features are supported via Pyrefly:

• Diagnostics (errors, warnings, hints)
• Go to definition / type definition / implementation
• Find references
• Hover information
• Completions
• Signature help
• Rename
• Document/workspace symbols
• Inlay hints
• Semantic highlighting
• Call hierarchy

GPL-3.0+