docs: def extract_function_argument(text, f_name, f_argn, f_argt=asttypes.String):
      """
      Extract a specific argument from a specific function name.
  
      Arguments:
  
      text
          The source text.
      f_name
          The name of the function
      f_argn
          The argument position
      f_argt
          The argument type from calmjs.parse.asttypes;
          default: calmjs.parse.asttypes.String
      """
  
      tree = parse(text)
      return list(filter_function_argument(tree, f_name, f_argn, f_argt))