code: def setup(self):
          
          super(RequireJSFilter, self).setup()
  
          excluded_files = []
          for bundle in self.excluded_bundles:
              excluded_files.extend(
                  map(lambda f: os.path.splitext(f)[0],
                      bundle.contents)
              )
  
          if excluded_files:
              self.argv.append(
                  'exclude={0}'.format(','.join(excluded_files))
              )
docs: Setup filter (only called when filter is actually used).