Optionalconfirm?: booleanWait for broker confirmation. Defaults to true.
OptionalcontentType?: OOptionalmandatory?: booleanAsk the broker to return the message if it can't be routed to a queue.
Returned messages are delivered to the session-level onreturn handler
when one is configured; otherwise the default channel handler just
logs them. Defaults to false.
OptionalroutingKey?: stringRouting key. Defaults to "".
Options for AMQPExchange#publish.