This is the script to export the .jsbundle and import to Main Bundle of the app. It's necessary when you want to deploy an iOS with integrated React Native app on AppStore/TestFlight

exp-jsbundle.sh

# If on Release, must export js bundle to run

if [ "$CONFIGURATION" == "Debug" ]; then
  echo "Debug Configuration"
else
  echo "Release Configuration"
  # in my project "js/node_modules"
  cd js
  # Create a new .jsbundle  
  react-native bundle --platform ios --dev false --entry-file index.ios.js --bundle-output main.jsbundle
  RESOURCE_PATH=$SRCROOT/js
  FILENAME_IN_BUNDLE=main.jsbundle
  BUILD_APP_DIR=${BUILT_PRODUCTS_DIR}/${PRODUCT_NAME}.app
  cp $RESOURCE_PATH/$FILENAME_IN_BUNDLE $BUILD_APP_DIR/$FILENAME_IN_BUNDLE
  echo "Copied jsbundle √"
fi