def static_folder(self) -> str | None:
        """The absolute path to the configured static folder. ``None``
        if no static folder is set.
        """
        if self._static_folder is not None:
            return os.path.join(self.root_path, self._static_folder)
        else:
            return None
The absolute path to the configured static folder. ``None``
        if no static folder is set.
        
src/flask/sansio/scaffold.py