defaultChild doesn't work for Autoscaling group

[SanderKnape]

• I'm submitting a ...

  • 🪲 bug report
  • 🚀 feature request
  • 📚 construct library gap
  • ☎️ security issue or vulnerability => Please see policy
  • ❓ support request => Please see note at the top of this template.

• What is the current behavior?
  If the current behavior is a 🪲bug🪲: Please provide the steps to reproduce

To get the underlying CFN resource for an Autoscaling group, node.tryFindChild('ASG') must be used instead of node.defaultChild(). This is because "ASG" is used instead of "Resource" within the construct:

aws-cdk/packages/@aws-cdk/aws-autoscaling/lib/auto-scaling-group.ts

Line 454 in f0fec54

this.autoScalingGroup = new CfnAutoScalingGroup(this, 'ASG', asgProps);

• What is the expected behavior (or behavior of feature suggested)?

To be able to simply use defaultChild.

• What is the motivation / use case for changing the behavior or adding this feature?

Ideally you wouldn't need access to the underlying CFN resource, but for an autoscaling group there is a use case when using cfn-init as described here: #1413

• Please tell us about your environment:

  • CDK CLI Version: 1.0.0
  • Module Version: 1.0.0
  • OS: [all]
  • Language: [all ]

[rix0rrr]

Fixed by #3572