ERROR : Sealed classes are not supported as program classes

[justin-prabhakaran]

🐞 Bug Report

Package version
record: ^6.0.0

Environment

OS: Android

Flutter 3.27.1 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 17025dd882 (5 months ago) • 2024-12-17 03:23:09 +0900
Engine • revision cb4b5fff73
Tools • Dart 3.6.0 • DevTools 2.40.2

Android Gradle Plugin: 7.3.0

Kotlin version: 1.8.x

minSdkVersion: 26

compileSdkVersion: 34

📄 Describe the bug
When building the project using the latest record plugin (^6.0.0), the following build error is thrown:

ERROR:/home/crazyshit/englishbhashi/app-fe/build/record_android/intermediates/runtime_library_classes_dir/debug/com/llfbandit/record/record/format/Format.class: D8: com.android.tools.r8.internal.Hc: Sealed classes are not supported as program classes

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:mergeLibDexDebug'.
> Could not resolve all files for configuration ':app:debugRuntimeClasspath'.
   > Failed to transform debug (project :record_android) to match attributes {artifactType=android-dex, asm-transformed-variant=NONE, com.android.build.api.attributes.AgpVersionAttr=7.3.0, com.android.build.api.attributes.BuildTypeAttr=debug, com.android.build.gradle.internal.attributes.VariantAttr=debug, dexing-enable-desugaring=true, dexing-enable-jacoco-instrumentation=false, dexing-is-debuggable=true, dexing-min-sdk=26, org.gradle.category=library, org.gradle.jvm.environment=android, org.gradle.libraryelements=classes, org.gradle.usage=java-runtime, org.jetbrains.kotlin.platform.type=androidJvm}.
      > Execution failed for DexingNoClasspathTransform: /home/crazyshit/englishbhashi/app-fe/build/record_android/intermediates/runtime_library_classes_dir/debug.
         > Error while dexing.

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.

⚙️ Configuration
The plugin is initialized with the following:

 RecordConfig(
            encoder: AudioEncoder.wav,
            sampleRate: 16000,
            numChannels: 1,
          ),

🚶 To Reproduce
Steps to reproduce the issue:

Add record: ^6.0.0 to pubspec.yaml

Set minSdkVersion 26 and enable coreLibraryDesugaring in build.gradle

Attempt to build or run the Flutter project on Android

See build error related to sealed class in Format.class

✅ Expected behavior
Build should succeed, or the library should avoid using Kotlin sealed class constructs that break compatibility with D8.

📎 Additional context
Tried both desugar_jdk_libs:1.2.3 and 2.0.3

flutter clean, invalidate caches, and rebuilding didn’t help

Verified the issue comes from record_android native code

If there’s a workaround like downgrading or modifying the sealed class usage, please let me know. Thanks!

[llfbandit]

Please read the docs.