Do eslint only changed files

eslint.sh

# The regexp without escapse is ^[^D]{2}.*((.js)|/)$ with:
#     [^D]{2} means that's not a deleted file from git output
#     .* is the file name
#     ((.js)|/) means it's end with .js extension, or a slash (directory)
# To use in package.json, we need to double the escapse: ^[^D]\\{2\\}.*\\(\\(\\.js\\)\\|/\\)$ pretty neat huh?
git status --porcelain | grep '^[^D]\{2\}.*\(\(\.js\)\|/\)$' | cut -c 4- | xargs eslint