Correct me if I'm wrong but lefthook doesn't run its hooks exclusively on the staged changes IIRC. pre-commit, and prek by extension, have a process to stash the unstaged changes using git and running the code only on the staged files. Last I used it, lefthook ran on every file regardless of git status. This annoyed me because I'd have a few stray files that were not ready to be checked in or tracked that would trigger failures in lefthook. At the time this also made some hooks run slower since it would run on every single file but I think most linters have become significantly faster now.

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mm263 5 hours ago | parent | next [-]

Please look at the example that is literally on the front page of the lefthook website: https://lefthook.dev/

	▲	aniforprez 4 hours ago \| parent [-]
		Ah ok the home page actually reminded me what the actual issue was. It can pass the list of staged files to the command but since it doesn't actually stash anything, it's not compatible with commands that don't accept a list of files. golangci-lint for example doesn't accept a list of files like this and will run on every single file in the repo. I don't know if this behaviour has changed in lefthook or golangci-lint now.

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jdxcode 4 hours ago | parent | prev [-]

in hk you can not only have a mix of staged/unstaged files but it even deals with staged/unstaged HUNKS in the same file (best it can at least)