lib/membrane/notification.ex
defmodule Membrane.Notification do
@moduledoc """
A notification is a message sent from `Membrane.Element` to a parent
via action `t:Membrane.Element.Action.notify_t/0` returned from any callback.
A notification can be handled in parent with
`c:Membrane.Parent.handle_notification/4` callback.
"""
@type t :: any
end