[cloudformation] NestedStack doesn't have defaultChild

[edisongustavo]

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

[rix0rrr]

You are very correct. It needs to be assigned as it has a non-standard name.

[edisongustavo]

@rix0rrr is there a workaround in the mean time?

I'm confused from your answer because if I call the children property, then I get a list of length 0.

[edisongustavo]

I have also tried this on version 1.71.0 with the same result.

[edisongustavo]

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

[Jacco]

@rix0rrr created a PR for this (my first)

[github-actions]

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