Git Pre Commit Hook for ESLint and Jest

pre-commit

#!/usr/bin/env bash
 
 
STAGED_FILES=$(git diff --cached --name-only --diff-filter=ACM | grep '\.jsx\?$')
BIN_PATH="$(git rev-parse --show-toplevel)/node_modules/.bin"
 
eslint() {
  ESLINT="$BIN_PATH/eslint"
 
  # Check for eslint
  if [[ ! -x "$ESLINT" ]]; then
    printf "\t\033[41mPlease install ESLint\033[0m\n"
    exit 1
  fi
 
  echo "Linting modified files"
 
  echo $STAGED_FILES | xargs $ESLINT
 
  if [[ $? == 0 ]]; then
    printf "\n\033[1;32mLint Passed\033[0m\n"
  else
    printf "\n\033[41mLint Failed:\033[0m Fix lint errors and try again!\n"
    exit 1
  fi
}
 
jest() {
  JEST="$BIN_PATH/jest"
 
  # Check for jest
  if [[ ! -x "$JEST" ]]; then
    printf "\t\033[41mPlease install Jest\033[0m\n"
    exit 1
  fi
 
  echo "Testing related to modified files"
 
  $JEST --bail --findRelatedTests $STAGED_FILES
 
  if [[ $? == 0 ]]; then
    printf "\n\033[1;32mTest Passed\033[0m\n"
  else
    printf "\n\033[41mTest Failed:\033[0m Fix test errors and try again!\n"
    exit 1
  fi
}
 
# Exit if no files modified
if [[ "$STAGED_FILES" = "" ]]; then
  exit 0
fi
 
eslint
jest
 
exit $?

This gist helped me to write a new hook, thank you for sharing it, I really appreciate you doing that!!