ESLint git pre-commit hook to check Javascript code quality

eslint-pre-commit

#!/bin/sh

# 1.
# Code Quality Check
# @scope ./react
#
STAGED_FILES=$(git diff --cached --name-only --diff-filter=ACM "src/react/*.js" "react/*.jsx" | tr '\n' ' ')
ESLINT="$(git rev-parse --show-toplevel)/react/node_modules/.bin/eslint"

[ -z "$STAGED_FILES" ] && exit 0

# Check if Eslint installed
[ ! -x "$ESLINT" ] && echo "\033[41m Please install ESlint \033[0m (cd react && npm i -D eslint)" && exit 1

# Start validation
VALIDATION_PASSED=true

echo "$STAGED_FILES \n Validating Javascript:"

for FILE in $STAGED_FILES
do
  "$ESLINT" "$FILE"
  if [ -n "$?" ]; then
    VALIDATION_PASSED=false
  fi
done

if ! $VALIDATION_PASSED; then
  echo "\033[41m COMMIT FAILED: \033[0m
        Your commit contains files that should pass ESLint but do not.
        Please fix the ESLint errors and try again."
  exit 1
fi

exit $?