Run eslint on all staged files before committing

pre-commit

#!/bin/bash

for file in $(git diff --diff-filter=d --cached --name-only | grep -E '\.js$')
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."
    exit 1 # exit with failure status
  fi
done