Running this through the debugger, you can see that the

topicBus

environment only contains the two variables set in the

defaultFunctionProps

. It does not include

TOPIC_BUS_ARN

Hey @Jason S, try this:

this.topicBus.addSubscribers(this,
      [{
        // handler for creating a new brokerage
        function: {
          handler: "modules/brokerage/commands/create_brokerage/create_brokerage_notification_controller.main",
          functionName: "CreateBrokerageNotificationHandler",
          environment: {
            TOPIC_BUS_ARN: this.topicBus.topicArn
          },
          permissions: [this.topicBus],
        },
        subscriberProps: {
          filterPolicy: {
            event: SubscriptionFilter.stringFilter({
              allowlist: ["TRANSACTION_IMPORT_CREATED"],
            }),
          },
        },
      }]
     )

Crushing Frank thank you sir that sorted it

it’s really just that

functionName

,

environment

and

permissions

should all go under the

function

props.