Incomplete example of CDK code for deploying an Eventbridge-Bus with some basic routing capabilities

eventbridge-stack.ts

import * as cdk from 'aws-cdk-lib';
import * as eventbridge from 'aws-cdk-lib/aws-events';
import * as sns from 'aws-cdk-lib/aws-sns';
import * as iam from 'aws-cdk-lib/aws-iam';

export class EventBridgeStack extends cdk.Stack {
  constructor(scope: cdk.Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

    // Create EventBridge bus
    const bus = new eventbridge.EventBus(this, 'EventBus');

    // Create SNS topics
    const signupTopic = new sns.Topic(this, 'SignupTopic', {
      displayName: 'Signup Topic',
    });
    const updatedTopic = new sns.Topic(this, 'UpdatedTopic', {
      displayName: 'Updated Topic',
    });
    const deletedTopic = new sns.Topic(this, 'DeletedTopic', {
      displayName: 'Deleted Topic',
    });

    // Add outlets to the EventBridge bus
    bus.addTarget(new eventbridge.SnsTopic(signupTopic, {
      message: eventbridge.RuleTargetInput.fromEventPath('$.detail.action == "signup"'),
    }));
    bus.addTarget(new eventbridge.SnsTopic(updatedTopic, {
      message: eventbridge.RuleTargetInput.fromEventPath('$.detail.action == "updated"'),
    }));
    bus.addTarget(new eventbridge.SnsTopic(deletedTopic, {
      message: eventbridge.RuleTargetInput.fromEventPath('$.detail.action == "deleted"'),
    }));

    // Grant necessary permissions to publish to the topics
    const eventBridgePrincipal = new iam.ServicePrincipal('events.amazonaws.com');
    signupTopic.grantPublish(eventBridgePrincipal);
    updatedTopic.grantPublish(eventBridgePrincipal);
    deletedTopic.grantPublish(eventBridgePrincipal);
  }
}

const app = new cdk.App();
new EventBridgeStack(app, 'MyEventBridgeStack');
app.synth();