Adding fetch - see symfony/stimulus-bridge#15

Keeping webpackMode for support of people using an old Flex version

Author: weaverryan

Resources/assets/package.json

@@ -8,6 +8,7 @@
             "swup": {
                 "main": "dist/controller.js",
                 "webpackMode": "eager",
+                "fetch": "eager",
                 "enabled": true
             }
         }