fix(core): cross-stack references to NestedStack list values produces invalid outputs #32575
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… invalid outputs (aws#27233) Referencing a list attribute of a resource defined within a NestedStack synthesizes successfully but the nested stack will fail deployment with the error: ``` Template format error: Every Value member must be a string. ``` This prevents deploying resources such into NestedStack instances if a reference to that resource's list attribute needs to be referenced in a cross-stack context. For example, deploying a `InterfaceVpcEndpoint` instance in a nested stack and attempting to reference its `vpcEndpointDnsEntries` property within a different stack will cause this error. To fix this issue, a similar strategy to `exportStringListValue` is used to join the reference's values into a string and expose that value as the output from the nested stack. The reference to the serialized value is then re-exported as normally needed to hoist it to the top-level parent stack. The final reference that imports the value is then re-written to also deserialize the imported string back to the original list. fixes aws#27233 ---- *By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*
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Issue
Closes #27233.
Reason for this change
Referencing a list attribute of a resource defined within a
NestedStacksynthesizes successfully but the nested stack will fail deployment with the error:This prevents deploying resources into a
NestedStackinstance if a reference to one of that resource's list attribute exists within a cross-stack context. For example, deploying aInterfaceVpcEndpointinstance in a nested stack and attempting to reference itsvpcEndpointDnsEntriesproperty within a different stack will cause this error.See new integration test at
packages/@aws-cdk-testing/framework-integ/test/core/test/integ.nested-stack-references.tsfor minimal reproduction.Description of changes
A similar strategy to
exportStringListValueis used to serialized the reference's values into a string and expose that value as the output from the nested stack. The reference to the serialized value is then made exportable as normally needed to hoist it to the top-level parent stack. The final reference that imports the value is then re-written to also deserialize the imported string back to the original list.The return types of some internal methods were modified to handle the fact that core/lib/private/refs.ts's
getExportableno longer necessarily returns a Reference. This was needed because an exportable may now be a value derived from a reference instead of only a direct reference.Describe any new or updated permissions being added
N/A
Description of how you validated changes
Checklist
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license