rabbitmq-server/deps/rabbitmq_cli/lib/rabbitmq/cli/formatter_behaviour.ex

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## The Original Code is RabbitMQ.
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# Formats returned values e.g. to human-readable text or JSON.
defmodule RabbitMQ.CLI.FormatterBehaviour do
  @callback format_output(any, map()) :: String.t | [String.t]
  @callback format_stream(Enumerable.t, map()) :: Enumerable.t
end