Yggdrasil.Subscriber.Generator.unsubscribe

You're seeing just the function unsubscribe, go back to Yggdrasil.Subscriber.Generator module for more information.
Link to this function

unsubscribe(channel, pid \\ nil)

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Specs

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

Makes a pid unsubscribe from a channel.