Add Swift Macro Compatibility Check GitHub Action #307
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This pull request introduces the Swift Macro Compatibility Check GitHub Action into the CI workflow. This action verifies that the Swift package remains compatible with multiple versions of
swift-syntax, which is critical for macro-based functionality.Motivation for Adding This Check:
swift-syntax Versioning Complexity: As detailed by Point-Free in their article, "Being a good citizen in the land of SwiftSyntax", swift-syntax employs a versioning scheme where minor versions of Swift correspond to major versions of swift-syntax (e.g., SwiftSyntax 509.0 maps to Swift 5.9). This scheme introduces complexity in maintaining compatibility across versions.
Frequent Breaking Changes: Minor releases of swift-syntax have introduced breaking changes, which can cause issues with existing macros and dependencies. This action helps ensure that our macros remain functional across these versions.
Dependency Graph Resolution: By testing against multiple versions, we can prevent dependency conflicts in the broader Swift ecosystem. This is essential, especially as more libraries are adopting macros and using swift-syntax, increasing the likelihood of conflicting dependencies.
Proactive Development: Catching compatibility issues early in the development cycle allows us to resolve them before they become critical, reducing the risk of blocked releases or difficult debugging sessions later.
Important
To ensure the library can be used alongside others in the Swift packages, it need to support all versions of swift-syntax. Without this compatibility, users may face issues where they can't use several libraries together if they depend on different versions of swift-syntax.