from collections.abc import Callable


class UserInterface:
	def add_user(self, name: str):
		pass

	def add_user_info_listener(self, callback: Callable[[str, str], None]):
		pass

	def add_start_listener(self, callback: Callable[[list[str]], None]):
		pass

	def announce_recipient(self, name: str, other_info: str):
		pass