fix(ecs): autoscalingGroup attribute does not exist on ImportedCluster

packages/aws-cdk-lib/aws-ecs/lib/cluster.ts

@@ -858,6 +858,11 @@ class ImportedCluster extends Resource implements ICluster {
    */
   public readonly hasEc2Capacity: boolean;
 
+  /**
+   * Autoscaling group of the cluster
+   */
+  readonly autoscalingGroup?: autoscaling.IAutoScalingGroup;
+
   /**
    * Cloudmap namespace created in the cluster
    */
@@ -878,6 +883,7 @@ class ImportedCluster extends Resource implements ICluster {
     this.hasEc2Capacity = props.hasEc2Capacity !== false;
     this._defaultCloudMapNamespace = props.defaultCloudMapNamespace;
     this._executeCommandConfiguration = props.executeCommandConfiguration;
+    this.autoscalingGroup = props.autoscalingGroup;
 
     this.clusterArn = props.clusterArn ?? Stack.of(this).formatArn({
       service: 'ecs',

packages/aws-cdk-lib/aws-ecs/test/cluster.test.ts

@@ -1527,6 +1527,26 @@ describe('cluster', () => {
     expect(cluster.connections.securityGroups).toEqual([]);
   });
 
+  test('Can import autoscaling groups', () => {
+    // GIVEN
+    const stack = new cdk.Stack();
+    const vpc = new ec2.Vpc(stack, 'Vpc');
+    const autoscalingGroup = new autoscaling.AutoScalingGroup(stack, 'asgal2', {
+      vpc,
+      instanceType: new ec2.InstanceType('bogus'),
+      machineImage: ecs.EcsOptimizedImage.amazonLinux2(),
+    });
+
+    const cluster = ecs.Cluster.fromClusterAttributes(stack, 'Cluster', {
+      clusterName: 'cluster-name',
+      vpc,
+      autoscalingGroup,
+    });
+
+    // THEN
+    expect(cluster.autoscalingGroup).toEqual(autoscalingGroup);
+  });
+
   test('Metric', () => {
     // GIVEN
     const stack = new cdk.Stack();