❓ General Issue

I want to have a CodeCommit repository in one stack triggering a CodePipeline in another stack, both stacks being deployed to the same region.

When passing the repo as a prop to the stack containing the pipeline, I get a circular dependency error:
'RepoStack' depends on 'PipelineStack' (RepoStack -> PipelineStack/Pipeline/Resource.Ref, RepoStack -> PipelineStack/Pipeline/EventsRole/Resource.Arn). Adding this dependency (PipelineStack -> RepoStack/Repository/Resource.Name) would create a cyclic reference.

My code looks as follows:

const repoStack = new RepoStack(app, 'RepoStack', {
  env: envDevOps,
});
new PipelineStack(app, 'PipelineStack', {
  env: envDevOps,
  repo: repoStack.repo,
});

export class RepoStack extends cdk.Stack {
  public readonly repo: codecommit.Repository;

  constructor(scope: cdk.Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

    this.repo = new codecommit.Repository(this, 'Repository', {
      repositoryName: 'MyRepo',
    });
  }
}

export class PipelineStack extends cdk.Stack {
  constructor(scope: cdk.Construct, id: string, props: PipelineStackProps) {
    super(scope, id, props);

    const sourceAction = new codepipeline_actions.CodeCommitSourceAction({
      actionName: 'CodeCommit_Source',
      repository: props.repo,
      output: sourceOutput,
    });
    
    // ...
  }
}

The Question

How can I have a CodeCommit repository in one stack triggering a CodePipeline in another stack without introducing a circular dependency (both in the same account/region)?

When the RepoStack is deployed to another account, everything works fine. I suspect that, in this case, the cross-account support stacks do the magic.
Still, it comes to a surprise that support for cross-references across accounts is better than support for cross-references within the same account.

I think this problem can be generalized to many scenarios with circular dependencies.

Environment

• CDK CLI Version: 1.39.0 (build 5d727c1)
• OS: MacOS Catalina
• Language: all