code: def create_assets_env(generator):
      
  
      theme_static_dir = generator.settings['THEME_STATIC_DIR']
      assets_destination = os.path.join(generator.output_path, theme_static_dir)
      generator.env.assets_environment = Environment(
          assets_destination, theme_static_dir)
  
      if 'ASSET_CONFIG' in generator.settings:
          for item in generator.settings['ASSET_CONFIG']:
              generator.env.assets_environment.config[item[0]] = item[1]
  
      if 'ASSET_BUNDLES' in generator.settings:
          for name, args, kwargs in generator.settings['ASSET_BUNDLES']:
              generator.env.assets_environment.register(name, *args, **kwargs)
  
      if 'ASSET_DEBUG' in generator.settings:
          generator.env.assets_environment.debug = generator.settings['ASSET_DEBUG']
      elif logging.getLevelName(logger.getEffectiveLevel()) == "DEBUG":
          generator.env.assets_environment.debug = True
  
      for path in (generator.settings['THEME_STATIC_PATHS'] +
                   generator.settings.get('ASSET_SOURCE_PATHS', [])):
          full_path = os.path.join(generator.theme, path)
          generator.env.assets_environment.append_path(full_path)
docs: Define the assets environment and pass it to the generator.