def app_module(self) -> ModuleType | None:
        """Return the app module if `app_module_import` is set.

        Returns:
            The app module.
        """
        return (
            importlib.import_module(self.app_module_import)
            if self.app_module_import
            else None
        )
Return the app module if `app_module_import` is set.

        Returns:
            The app module.
        
reflex/config.py