What is the AWS CDK?

export class MyEcsConstructStack extends Stack {
  constructor(scope: App, id: string, props?: StackProps) {
    super(scope, id, props);

    const vpc = new ec2.Vpc(this, "MyVpc", {
      maxAzs: 3, // Default is all AZs in region
    });

    const cluster = new ecs.Cluster(this, "MyCluster", {
      vpc: vpc,
    });

    // Create a load-balanced Fargate service and make it public
    new ecs_patterns.ApplicationLoadBalancedFargateService(
      this,
      "MyFargateService",
      {
        cluster: cluster, // Required
        cpu: 512, // Default is 256
        desiredCount: 6, // Default is 1
        taskImageOptions: {
          image: ecs.ContainerImage.fromRegistry("amazon/amazon-ecs-sample"),
        },
        memoryLimitMiB: 2048, // Default is 512
        publicLoadBalancer: true, // Default is false
      }
    );
  }
}