reference resources between CDK stacks

CloudFormation supports the concept of exporting outputs from one stack and importing their values into another stack.

In CDK, you can export a resource's output by creating a cfnOutput with an exportName property. You can also use Fn.ImportValue to import an exported value to a stack from a different stack.

Here's a blog post that illustrates this concept in further detail.

Note that neither CDK nor CloudFormation support circular stack dependencies, so you can't have stack A depend on a resource in stack B while also having stack B depend on a resource in stack A. The stack dependency graph must be acyclical.

CDK can handle export/import of the resource variable automatically.

If you make a resource a member variable of the stack instance, and reference that stack member variable from the other stack by passing the variable as a property of stack props parameter, CDK will export the resource reference, and import it from the other stack automatically.

You can find more detailed information from https://docs.aws.amazon.com/cdk/v2/guide/resources.html#resource_stack.

Be aware that this operation only supported in a same region stacks. If you need to deploy the two stacks in two different regions, you need other mechanism.