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feat(core): add Fn::GetStackOutput for cross-region references - #37724
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Introduces a new feature flag `USE_GET_STACK_OUTPUT` that enables using the CloudFormation intrinsic function `Fn::GetStackOutput` for cross-region stack references instead of custom resources with SSM parameters. When `crossRegionReferences=true` and this flag is enabled, cross-region references are resolved using `Fn::GetStackOutput`, which directly retrieves outputs from other stacks without requiring custom resources. Changes: - Add `Fn.getStackOutput()` method and `FnGetStackOutput` class in cfn-fn.ts - Implement `createGetStackOutput()` in refs.ts to generate outputs and references - Add `USE_GET_STACK_OUTPUT` feature flag with recommended value `true` - Update feature flags documentation and recommended flags configuration - Add test coverage for the new functionality
mrgrain
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May 1, 2026
mrgrain
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May 1, 2026
aws-cdk-automation
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May 1, 2026 15:19
✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.
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mrgrain
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May 1, 2026
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By default, the CDK only allows references between resources if they are in the same environment (account and region). But users can opt in to an experimental feature that allows cross-region, same-account references, by setting the
crossRegionReferenceflag totruein the consumer stack. With this feature on, when there is a cross-region reference, the CDK generates two custom resources that communicate with each other via SSM parameters. A writer resource is deployed to the producer stack, and a reader resource is deployed to the consumer stack.So far, this was the best mechanism to "export" a value in the producer and "import" it in the consumer. But CloudFormation has now released a new intrinsic function,
Fn::GetStackOutput, which, as the name suggests, gets the value of a arbitrary output. This function works cross-region and cross-account. This PR introduces support for these two use cases.By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license