code: def init_config(self, app):
          
          app.config.setdefault('REQUIREJS_BASEURL', app.static_folder)
          app.config.setdefault('COLLECT_STATIC_ROOT', app.static_folder)
          app.config.setdefault('COLLECT_STORAGE', 'flask_collect.storage.link')
          app.config.setdefault(
              'COLLECT_FILTER', partial(collect_staticroot_removal, app))
          app.config.setdefault(
              'WEBPACKEXT_PROJECT', 'invenio_assets.webpack:project')
docs: Initialize configuration.
  
          :param app: An instance of :class:`~flask.Flask`.