@type t() :: %{
  :children => %{required(Membrane.Child.name()) => Membrane.ChildEntry.t()},
  :clock => Membrane.Clock.t(),
  :module => module(),
  :playback => Membrane.Playback.t(),
  :resource_guard => Membrane.ResourceGuard.t(),
  :utility_supervisor => Membrane.UtilitySupervisor.t(),
  optional(:from) => [GenServer.from()],
  optional(:members) => [Membrane.Child.name()],
  optional(:crash_initiator) => Membrane.Child.name() | nil,
  optional(:crash_reason) => :normal | :shutdown | {:shutdown, term()} | term(),
  optional(:start_of_stream_received?) => boolean(),
  optional(:exit_reason) => :normal | :shutdown | {:shutdown, term()} | term(),
  optional(:group_name) => Membrane.Child.group() | nil
}