How to use the @aws-cdk/aws-ecs-patterns.ApplicationLoadBalancedFargateService function in @aws-cdk/aws-ecs-patterns

});

    // Configuration parameters
    const domainZone = HostedZone.fromLookup(this, 'Zone', { domainName: props.domainZone });
    const imageRepo = Repository.fromRepositoryName(this, 'Repo', 'reinvent-trivia-backend');
    const tag = (process.env.IMAGE_TAG) ? process.env.IMAGE_TAG : 'latest';
    const image = ContainerImage.fromEcrRepository(imageRepo, tag)

    // Lookup pre-existing TLS certificate
    const certificateArn = StringParameter.fromStringParameterAttributes(this, 'CertArnParameter', {
      parameterName: 'CertificateArn-' + props.domainName
    }).stringValue;
    const certificate = Certificate.fromCertificateArn(this, 'Cert', certificateArn);

    // Fargate service + load balancer
    new ApplicationLoadBalancedFargateService(this, 'Service', {
      cluster,
      taskImageOptions: { image },
      desiredCount: 3,
      domainName: props.domainName,
      domainZone,
      certificate
    });
  }
}

const taskDefinition = new ecs.TaskDefinition(this, 'orders-web-Task', {
            compatibility: ecs.Compatibility.FARGATE,
            memoryMiB: '512',
            cpu: '256',
        });

        taskDefinition.addContainer('defaultContainer', {
            image: ecs.ContainerImage.fromRegistry('amazon/amazon-ecs-sample'),
            logging: new ecs.AwsLogDriver({
                streamPrefix: 'coffeeshop',
            })
        }).addPortMappings({
            containerPort: 8080
        });

        const fargatesvc = new ecsPatterns.ApplicationLoadBalancedFargateService(this, 'AlbSvc', {
            cluster,
            taskDefinition,
        })

        const fargateTaskRole = fargatesvc.service.taskDefinition.taskRole;
        fargateTaskRole.addToPolicy(new iam.PolicyStatement({
            resources: ['*'],
            actions: ['events:*']
        }));
        const orderTable = new dynamodb.Table(this, 'Order', {
            partitionKey: { name: 'seqNo', type: dynamodb.AttributeType.NUMBER },
            billingMode: dynamodb.BillingMode.PAY_PER_REQUEST,
            tableName: 'Order',
        });

        orderTable.grantFullAccess(fargateTaskRole);