async def add_list_member(self, list_id: str, user_id: str) -> List:
        """
        Adds a user to a list.

        Parameters
        ----------
        list_id : :class:`str`
            The ID of the list.
        user_id : :class:`str`
            The ID of the user to add to the list.

        Returns
        -------
        :class:`List`
            The updated Twitter list.

        Examples
        --------
        >>> await client.add_list_member('list id', 'user id')
        """
        response, _ = await self.gql.list_add_member(list_id, user_id)
        return List(self, response['data']['list'])

        Adds a user to a list.

        Parameters
        ----------
        list_id : :class:`str`
            The ID of the list.
        user_id : :class:`str`
            The ID of the user to add to the list.

        Returns
        -------
        :class:`List`
            The updated Twitter list.

        Examples
        --------
        >>> await client.add_list_member('list id', 'user id')
        
twikit/client/client.py