code: def layers(self):
          
          extensions = ['*.%s' % f for f in EXTENSIONS]
          self.uri.setNameFilters(extensions)
          files = self.uri.entryList()
          self.uri.setNameFilters([])
          files = human_sorting([QFileInfo(f).baseName() for f in files])
          return files
docs: Return a list of layers available.
  
          :return: List of layers available in the datastore.
          :rtype: list
  
          .. versionadded:: 4.0