docs: update lefthook example

[AkaraChen]

Summary

If the root of the lefthook command is not specified, biome check will not follow biome.json[overrides]

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[ematipico]

@nhedger is the change make sense to you? You used lefthook before

[nhedger]

I've never used root before, and I'm not sure what the issue is in the first place. I'd like to reproduce the issue to confirm that this is indeed a documentation issue, and not a bug in Biome itself.

Would you be willing to provide a reproduction @AkaraChen ?

[AkaraChen]

Here's the step by step guide to reproduce:

https://github.com/AkaraChen/biomejs-repro-662

@nhedger

[nhedger]

Thanks for the detailed reproduction; this helped a lot!

I can reproduce the issue by following your instructions, but I suspect that the pattern specified in includes does not match the files in dir-1, which would explain why the file still gets linted.

Using the following value as include seems to correctly prevent Biome from linting the files in dir-1: ./dir-1/*.

What I can't yet explain, though, is why setting the root setting in lefthook somehow makes it work.

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@ematipico do we allow specifying folders as-is in the includes, or is it mandatory to specify a glob that matches files.

[Sec-ant]

Here're some relative discussions on this glob match behavior: biomejs/biome#2131 (comment)

[ematipico]

What I can't yet explain, though, is why setting the root setting in lefthook somehow makes it work.

It's possible that with this setting, lefthook computes the paths differently, which results in matching the glob specified.

However, if there's an issue, it's definitely around globs and not how lefthook should be set up.