Rambla.publish

You're seeing just the function publish, go back to Rambla module for more information.
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publish(target, message)

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Publishes the message to the target pool. The message structure depends on the destination. For RabbitMQ is might be whatever, for Smtp it expects to have to:, subject: and body: fields.

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publish(target, message, opts)

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Publishes the message to the target pool, allowing additional options to be set.