restore babel plugins

Author: andreadavanzo

package.json

@@ -56,6 +56,10 @@
   },
   "devDependencies": {
     "@babel/core": "^7.20.12",
+    "@babel/plugin-proposal-class-properties": "^7.18.6",
+    "@babel/plugin-proposal-object-rest-spread": "^7.20.7",
+    "@babel/plugin-proposal-private-methods": "^7.18.6",
+    "@babel/plugin-proposal-private-property-in-object": "^7.21.11",
     "@babel/plugin-transform-runtime": "^7.19.6",
     "@babel/preset-env": "^7.20.2",
     "@eslint/eslintrc": "3.3.1",
@@ -79,6 +83,7 @@
     "rails-erb-loader": "^5.5.2",
     "sass": "^1.57.1",
     "webpack": "^5.75.0",
-    "webpack-cli": "^6.0.1"
+    "webpack-cli": "^6.0.1",
+    "webpack-dev-server": "^5.2.2"
   }
 }