def event(self, coro):
        """A decorator that registers an event to listen to.

        You can find more info about the events on the :ref:`documentation below <discord-api-events>`.

        The events must be a |corourl|_, if not, :exc:`TypeError` is raised.

        Example
        ---------

        .. code-block:: python3

            @client.event
            async def on_ready():
                print('Ready!')

        Raises
        --------
        TypeError
            The coroutine passed is not actually a coroutine.
        """

        if not asyncio.iscoroutinefunction(coro):
            raise TypeError('event registered must be a coroutine function')

        setattr(self, coro.__name__, coro)
        log.debug('%s has successfully been registered as an event', coro.__name__)
        return coro