Pre-commit hook for Linting JS with ESLint before commit.

pre-commit-eslint

#!/bin/sh

STAGED_FILES=$(git diff --cached --name-only --diff-filter=ACM | grep ".jsx\{0,1\}$")
ESLINT="$(git rev-parse --show-toplevel)/node_modules/.bin/eslint"

if [[ "$STAGED_FILES" = "" ]]; then
  exit 0
fi

PASS=true

printf "\nValidating Javascript:\n"

# Check for eslint
if [[ ! -x "$ESLINT" ]]; then
  printf "\t\033[41mPlease install ESlint\033[0m (npm i --save-dev eslint)"
  exit 1
fi

for FILE in $STAGED_FILES
do
  "$ESLINT" "$FILE"

  if [[ "$?" == 0 ]]; then
    printf "\t\033[32mESLint Passed: $FILE\033[0m"
  else
    printf "\t\033[41mESLint Failed: $FILE\033[0m"
    PASS=false
  fi
done

printf "\nJavascript validation completed!\n"

if ! $PASS; then
  printf "\033[41mCOMMIT FAILED:\033[0m Your commit contains files that should pass ESLint but do not. Please fix the ESLint errors and try again.\n"
  exit 1
else
  printf "\033[42mCOMMIT SUCCEEDED\033[0m\n"
fi

exit $?

It fails on error, but not on warnings. What to change in this script so that it fails on warnings too?

You should configure your .eslintrc to treat rules you consider important as errors. You can also change the command to "$ESLINT" "$FILE" --max-warnings 0 instead.

Hello Everyone,

I created this a long time ago and I no more write such manual scripts. I rely on husky for everything. So pardon me for my delayed response or if I am unable to help. I see there are a lot of helpful comments. I thank each and everyone for making this better. Cheers.

Hello Everyone,

I created this a long time ago and I no more write manual scripts. I rely on husky for everything. So pardon me for my delayed response or if I am unable to help. I see there are a lot of helpful comments. I thank each and everyone for making this better. Cheers.

Could you update this then? I think that's why you're still getting so much traffic here.
https://levelup.gitconnected.com/how-to-run-eslint-using-pre-commit-hook-25984fbce17e

Edit: nevermind :D lol big notice right at the top, I skimmed past it - my bad.

Could you update this then? I think that's why you're still getting so much traffic here.
https://levelup.gitconnected.com/how-to-run-eslint-using-pre-commit-hook-25984fbce17e

Edit: nevermind :D lol big notice right at the top, I skimmed past it - my bad.

Edited the notice to clearly indicate I am not maintaining this gist anymore. Thank you for the suggestion @julix-unity ;)