Yggdrasil.handle_event

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

handle_event(arg1, message, state)

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Specs

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

Callback to handle incoming messages from a channel.