code: def get_flashed_messages(
          with_categories: bool=False,
          category_filter: List[str]=[],
  ) -> Union[List[str], List[Tuple[str, str]]]:
      
      flashes = session.pop('_flashes') if '_flashes' in session else []
      if category_filter:
          flashes = [flash for flash in flashes if flash[0] in category_filter]
      if not with_categories:
          flashes = [flash[1] for flash in flashes]
      return flashes
docs: Retrieve the flashed messages stored in the session.
  
      This is mostly useful in templates where it is exposed as a global
      function, for example
  
      .. code-block:: html+jinja
  
          <ul>
          {% for message in get_flashed_messages() %}
            <li>{{ message }}</li>
          {% endfor %}
          </ul>
  
      Note that caution is required for usage of ``category_filter`` as
      all messages will be popped, but only those matching the filter
      returned. See :func:`~quart.helpers.flash` for message creation.