fix: babel

packages/medusa/package.json

@@ -19,6 +19,7 @@
     "@babel/node": "^7.7.4",
     "@babel/plugin-proposal-class-properties": "^7.7.4",
     "@babel/plugin-proposal-decorators": "^7.12.1",
+    "@babel/plugin-proposal-optional-chaining": "^7.14.2",
     "@babel/plugin-transform-classes": "^7.9.5",
     "@babel/plugin-transform-instanceof": "^7.8.3",
     "@babel/plugin-transform-runtime": "^7.7.6",