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Arbitrary attributes can be sent with each message. Attributes support string | number | boolean values. These can be provided by using the attributes property when sending a message.
await bus.send(
new ChargeCreditCard(),
attributes: {
ip: '',
attempt: 0,
automatic: true
Attributes can be accessed as the second parameter of the handler.
import { MessageAttributes } from '@node-ts/bus-messages'
await Bus.configure()
async (_: ChargeCreditCard, { attributes }: MessageAttributes) => console.log(attributes)