Git pre-commit hook to run ESlint

pre-commit

#!/bin/sh

STAGED_FILES=$(git diff --cached --name-only --dif-filter=ACM | grep ".jsx\{0,1\}$")

if [[ "$STAGED_FILES" = "" ]]; then
  exit 0
fi

PASS=true

echo "Validating Javascript:"

# Check for eslint
which eslint &> /dev/null
if [[ "$?" == 1 ]]; then
  echo "Please install ESlint"
  exit 1
fi

for FILE in $STAGED_FILES
do
  eslint "$FILE"
  
  if [[ "$?" == 0 ]]; then
    echo "ESlint passed: $FILE"
  else
    echo "$?"
    PASS=false
  fi
done

echo "Javascript validation completed!"

if ! $PASS; then
  echo "Commmit failed: your commit contains files that should pass ESlint but do not"
  exit 1
else
  echo "Commit succeeded"
fi

exit $?