Compilation error in rive_common-0.4.15 on Flutter 3.27.1 / Dart 3.6.0

[denisnadey]

Description

After updating to Flutter 3.27.1 and Dart 3.6.0, I encountered a compilation error when trying to build my Flutter project with rive_common-0.4.15. The error message indicates that _YGValue must be marked as base, final, or sealed because it extends Struct.

flutter pub-cache/hosted/pub.dev/rive_common-0.4.15/lib/src/layout_engine_ffi.dart:174:7: Error: The type '_YGValue' must be 'base', 'final' or 'sealed' because the supertype 'Struct' is 'base'.

This issue appears to be related to recent changes in Dart's handling of FFI structs.

Steps To Reproduce

1. Create a Flutter project with rive_common-0.4.15.
2. Run flutter build or flutter run.
3. Observe the compilation error in layout_engine_ffi.dart.

Expected behavior

The project should compile successfully without errors.

Workaround

I was able to resolve the issue locally by modifying _YGValue in layout_engine_ffi.dart and marking it as final:

final class _YGValue extends Struct {

After applying this change, the project compiled successfully without errors. However, this is just a temporary fix, and an official update in the package would be appreciated.

Device & Versions

• Device: MacBook M3 Pro
• OS: macOS 15.3
• Flutter Version:

  Flutter 3.27.1 • channel stable • https://github.com/flutter/flutter.git
  Framework • revision 17025dd882 (8 weeks ago) • 2024-12-17 03:23:09 +0900
  Engine • revision cb4b5fff73
  Tools • Dart 3.6.0 • DevTools 2.40.2
  

Additional context

This issue may be due to Dart 3.6 enforcing stricter constraints on FFI structures. It would be helpful if rive_common could update its codebase to be compatible with the latest Dart versions.

Would appreciate guidance on whether this fix should be incorporated officially.