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What would you like to do?
Pre-commit hook for eslint, linting *only* staged changes.
#!/bin/bash
for file in $(git diff --cached --name-only | grep -E '\.(js|jsx)$')
do
git show ":$file" | node_modules/.bin/eslint --stdin --stdin-filename "$file" # we only want to lint the staged changes, not any un-staged changes
if [ $? -ne 0 ]; then
echo "ESLint failed on staged file '$file'. Please check your code and try again. You can run ESLint manually via npm run eslint."
exit 1 # exit with failure status
fi
done

gichuwil commented Sep 9, 2016

Thanks. Very helpful.

Fer0x commented Jan 20, 2017

Option --diff-filter=d should be specified in git diff to exclude deleted files.

@Fer0x Where would that go?

rashtay commented Apr 24, 2017

@alberth8 It'd be like this -> git diff --diff-filter=d --cached --name-only

Thanks @dahjelle! Great stuff :)

sagar12861 commented Aug 8, 2017

Thank you very much

eslint is quite slow when it runs against my entire project, this is much faster, thanks!!

SalTor commented Dec 19, 2017

Has anyone figured out a workflow for using the --fix flag during this pre-commit hook?

What I've come across is that when the pre-commit hook is triggered for files that are staged, the new changes aren't included in the commit.

It makes sense why it wouldn't be included: this is changing a staged file, and those changes would also have to be staged.

lint-staged has a partly-working fix for this, however, and as they note, this doesn't work for partially-staged files, AKA files whose changes have been cherry-picked for a commit.

@SalTor take a look at this. It works well for me.

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