pre-commit hook to run prettier

pre-commit

#!/bin/sh
# Taken from https://prettier.io/docs/en/precommit.html#option-3-bash-script and added (s)css as target
jsfiles=$(git diff --cached --name-only --diff-filter=ACM "*.js" "*.jsx" "*.css" "*.scss" | tr '\n' ' ')
[ -z "$jsfiles" ] && exit 0

# Prettify all staged .js files
echo "$jsfiles" | xargs yarn run prettier --write

# Add back the modified/prettified files to staging
echo "$jsfiles" | xargs git add

exit 0