[cloudformation] NestedStack doesn't have defaultChild

I get an undefined object when I access the attribute defaultChild from a NestedStack’s node.

Reproduction Steps

I tried this code on https://play-with-cdk.com/

import * as cdk from '@aws-cdk/core';

import { CfnStack, NestedStack } from '@aws-cdk/aws-cloudformation';

// Keep the class name stable please
export class AppStack extends cdk.Stack {
    constructor(scope: cdk.Construct, id: string, props?: cdk.StackProps) {
        super(scope, id, props);
    
        // Add your code here
        var nestedStack = new NestedStack(this, 'MyNestedStack');
        var cfn_nestedStack = (nestedStack.node.defaultChild) as CfnStack;
        cfn_nestedStack.addPropertyOverride('TemplateURL', 'http://my-url.com');
    }
}

What did you expect to happen?

The stack to be synthesized without errors and with the TemplateURL parameter of the stack overriden.

What actually happened?

The synth crashes with this error:

TypeError: Cannot read property 'addPropertyOverride' of undefined

Environment

I have also tried it with Python and the same error happens.

• CLI Version : 1.59.0
• Framework Version: 1.59.0
• Node.js Version:
• OS : Ubuntu 18.04
• Language (Version): all

Other

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This is 🐛 Bug Report

[edisongustavo]

I found the workaround for NestedStack. It is a simple matter of using the nestedStackResource property instead of node.defaultChild.

[github-actions[bot]]

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