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[cloudformation] NestedStack doesn't have defaultChild

See original GitHub issue

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

Reproduction Steps

I tried this code on

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', '');

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


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


This is 🐛 Bug Report

Issue Analytics

  • State:closed
  • Created 3 years ago
  • Comments:6 (2 by maintainers)

github_iconTop GitHub Comments

edisongustavocommented, Nov 2, 2020

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

github-actions[bot]commented, May 24, 2022


Comments on closed issues are hard for our team to see. If you need more assistance, please either tag a team member or open a new issue that references this one. If you wish to keep having a conversation with other community members under this issue feel free to do so.

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