Yggdrasil.handle_disconnect

You're seeing just the callback handle_disconnect, go back to Yggdrasil module for more information.
Link to this callback

handle_disconnect(arg1, state)

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Specs

handle_disconnect(Yggdrasil.Channel.t(), state) ::
  {:ok, state}
  | {:subscribe, [Yggdrasil.Channel.t()], state}
  | {:unsubscribe, [Yggdrasil.Channel.t()], state}
  | {:stop, reason, state}
when state: term(), reason: term()

Callback to handle disconnections from a channel.