Lefthook

Add one command to the pre-commit hook in lefthook.yml, alongside any commands you already have:

lefthook.yml

pre-commit:
  commands:
    stagelint:
      run: stagelint

Then install the hooks as usual:

lefthook install

Leave {staged_files} and stage_fixed out, since stagelint finds the staged files itself and stages what its commands changed.

Do not set parallel: true on a hook that contains stagelint. It hides unstaged changes, writes to the git index and creates a stash ref while it runs, so other commands must not run at the same time.