code: def in_dir(
      config_dir=os.path.expanduser('~/.tmuxp'), extensions=['.yml', '.yaml', '.json']
  ):
      
      configs = []
  
      for filename in os.listdir(config_dir):
          if is_config_file(filename, extensions) and not filename.startswith('.'):
              configs.append(filename)
  
      return configs
docs: Return a list of configs in ``config_dir``.
  
      Parameters
      ----------
      config_dir : str
          directory to search
      extensions : list
          filetypes to check (e.g. ``['.yaml', '.json']``).
  
      Returns
      -------
      list