set -e

if [ "$GITHUB_ACTIONS" = "true" ]; then

echo "Running in a GitHub Actions workflow; not running 'npm install'"

exit 0

if [ ! -d node_modules ]; then

echo "Running 'npm install' because 'node_modules' directory is missing."

npm install

elif [ package.json -nt package-lock.json ]; then

echo "Running 'npm install' because 'package-lock.json' appears to be outdated."

npm install

elif [ package-lock.json -nt node_modules/.package-lock.json ]; then

echo "Running 'npm install' because 'node_modules/.package-lock.json' appears to be outdated."

npm install

echo "Skipping 'npm install' because everything appears to be up-to-date."