Motivation

The introduction of the CloudFormation v2 engine laid the foundation for a redesigned engine capable of accurately determining update requirements between CloudFormation deployments, while also enabling parallel execution during updates. However, the current implementation still lacks parity with AWS CloudFormation in several key areas. This set of changes addresses a number of those gaps by introducing parity improvements and establishing a structured approach for incrementally porting the existing test suite to the v2 engine.

Changes

• Added support for sampling runtime resource properties.
• Resolved issues where conditions could incorrectly be sampled via Ref intrinsic functions;
• Improved/simplified the logic associated with computing conditions.
• Fixed issues preventing bindings to empty data structures from being evaluated as Created or Removed during template updates.
• Added support for the Fn::Join intrinsic function.
• Addressed other minor parity issues
• Initiated porting of v1 tests to the v2 package, beginning with resources.apigateway. Added annotations explaining current test failures or limitations with the v2 engine.