Patch npm packages script using patch-package

patch-package.sh

#!/usr/bin/env sh

ROOT_DIR=$(cd "$(dirname "$0")/..";pwd -P)
PACKAGE_NAME=${1:-}
COMPLETE_FLAG="--complete"
if [ -z "$PACKAGE_NAME" ]; then
  echo "Usage ./`basename $0` <app-name> <package>"
  echo "  i.e. ./`basename $0` applicant-app react-native"
  exit 1
fi

APP_DIR=$ROOT_DIR
MAIN_PACKAGE_JSON=$APP_DIR/package.json
PACKAGE_VERSION=$(node -e "console.log(require('$MAIN_PACKAGE_JSON').dependencies['$PACKAGE_NAME'] || require('$MAIN_PACKAGE_JSON').devDependencies['$PACKAGE_NAME'])")

if [ $PACKAGE_VERSION == "undefined" ]; then
  echo ""
  echo "Package '$PACKAGE_NAME' does not appear to exist in $MAIN_PACKAGE_JSON"
  echo ""
  exit
fi
PACKAGE=$PACKAGE_NAME@$PACKAGE_VERSION
TEMP_DIR=$TMPDIR/patch-package-$PACKAGE_NAME
PATCHES_DIR=$APP_DIR/patches
COMPLETE=${2:-}

if [ $COMPLETE == $COMPLETE_FLAG ]; then
  echo ""
  echo "Creating patch for $PACKAGE..."
  echo ""
  mkdir -p $TEMP_DIR
  cd $TEMP_DIR
  ls -al
  npx patch-package $PACKAGE_NAME
  PATCH=$(ls patches/)
  cp patches/$PATCH $PATCHES_DIR
  cd $APP_DIR
  rm -rf $TEMP_DIR
  echo ""
  echo "Copied $PATCH to $PATCHES_DIR"
  echo ""
  exit
fi

echo ""
echo "Preparing patch for $PACKAGE..."
echo ""
mkdir -p $TEMP_DIR
cd $TEMP_DIR
yarn init -y
yarn add $PACKAGE

echo ""
echo "Now open $TEMP_DIR/node_modules/$PACKAGE_NAME and make the change you need. When complete, run:"
echo ""
echo "cd $ROOT_DIR && sh $0 $1 $2 $COMPLETE_FLAG"
echo ""