Returns a specification to start this module under a supervisor.

See Supervisor.

@spec start_link([DynamicSupervisor.option() | DynamicSupervisor.init_option()]) ::
  Supervisor.on_start()

Starts a distributor generator with Supervisor options.

@spec stop(Supervisor.supervisor()) :: :ok

Stops a distributor generator.

@spec subscribe(Yggdrasil.Channel.t(), nil | pid(), keyword()) ::
  :ok | {:error, term()}

Makes a pid subscribe to a channel.

@spec unsubscribe(Yggdrasil.Channel.t(), nil | pid()) :: :ok | {:error, term()}

Makes a pid unsubscribe from a channel.