new_contents: """Pauses the execution."""
  import time
  
  
  class Decorator:  # noqa
      def add_arguments(self, decorated, parser):  # noqa
          parser.add_argument(
              '--pause-ms',
              type=int,
              help="Pause in milliseconds before continuing"
          )
  
      def handle(self, decorated, pause_ms, **kwargs):  # noqa
          if pause_ms:
              time.sleep(pause_ms / 1000)
  
      def modify_args(self, decorated, args, cwd):  # noqa
          return args, cwd
  
subject: Add pause decorator