Yggdrasil.Transformer.encode

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

encode(channel, message)

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Specs

encode(channel :: Yggdrasil.Channel.t(), message :: term()) ::
  {:ok, term()} | {:error, term()}

Callback to define how to encode the messages going to a channel.