Yggdrasil.publish

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

publish(channel, message, options \\ [])

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Specs

publish(map() | keyword() | Yggdrasil.Channel.t(), term(), Keyword.t()) ::
  :ok | {:error, term()}

Publishes a message in a channel with some optional options.