Pre-commit to check tracked/commited js/jsx files with ESlint (node_modules)

pre-commit

#!/bin/bash

files=$(git diff --diff-filter=ACMRT --cached --name-only | grep '\.jsx\|\.js\?$')

# Prevent ESLint help message if no files matched
if [[ $files = "" ]] ; then
 exit 0
fi

failed=0
for file in ${files}; do
  git show :$file | node_modules/eslint/bin/eslint.js --stdin --stdin-filename $file
  if [[ $? != 0 ]] ; then
    failed=1
  fi
done;

if [[ $failed != 0 ]] ; then
  echo "ESLint check failed, commit denied"
  exit $failed
fi