Yggdrasil.Subscriber.Generator.subscribe

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

subscribe(channel, pid \\ nil, options \\ [])

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Specs

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

Makes a pid subscribe to a channel.