Run uv run --frozen lintrunner --all-files to reproduce CI lint locally before committing. Invoke lintrunner through uv run unless the project virtual environment is active; otherwise its Python-based linters may use a system Python without the development dependencies. To apply formatter fixes, run uv run --frozen lintrunner format --all-files, then rerun the full lint command. If lint fixes are needed after a commit, amend the commit rather than creating a separate lint fix commit.
The full test suite takes quite a long time to run. Prefer focused tests while iterating, and only run the full suite when the change is otherwise done.
When rewriting, splitting, rebasing, or autosquashing a ghstack stack, preserve existing ghstack-source-id, ghstack-comment-id, and Pull-Request trailers on each logical commit. Before submitting a rewritten stack, compare commit messages against the saved/pre-rewrite commits or search local history for an existing Pull-Request trailer with the same subject. If a logical commit was already submitted, keep its existing Pull-Request and ghstack-comment-id instead of letting ghstack create a new PR.