Build Failure: Duplicate Resources Error During AAR Packaging with React Native Libraries

[hidaeraldo]

I'm experiencing a build failure when trying to create an AAR file using the React Native Brownfield plugin. The build process fails with a "Duplicate resources" error during the packageDebugResources task.

Error Details:
Execution failed for task ':rnbrownfieldLibrary:packageDebugResources'.

[color/red] */brownfield-test/react-native-brownfield/android/rnbrownfieldLibrary/build/intermediates/exploded-aar/rnbrownfield/react-native-video/unspecified/debug/res/values/values.xml
[color/red] */brownfield-test/react-native-brownfield/android/rnbrownfieldLibrary/build/intermediates/exploded-aar/rnbrownfield/react-native-firebase_messaging/unspecified/debug/res/values/values.xml: Error: Duplicate resources

Environment:

• React Native Brownfield Plugin: @callstack/react-native-brownfield@^1.2.0
• React Native Version: 0.77.2
• Android Compile SDK: 35
• Min SDK: 24
• Build Tool: Gradle with Kotlin DSL

Steps to Reproduce:

1. Clone this example repo https://github.com/hidaeraldo/brownfield-test
2. cd react-native-brownfield folder
3. Install react-native-video and @react-native-firebase/messaging as dependencies
4. Attempt to build the AAR file using ./gradlew publishToMavenLocal or similar command
5. Build fails during the packageDebugResources task

Current Configuration:
The issue occurs in the rnbrownfieldLibrary module with the following build.gradle.kts configuration:

plugins {
    id("com.android.library")
    id("org.jetbrains.kotlin.android")
    id("com.facebook.react")
    id("com.callstack.react.brownfield")
    `maven-publish`
}

react {
    autolinkLibrariesWithApp()
}

Dependencies Involved:

• react-native-video: ^6.16.1
• @react-native-firebase/messaging: ^21.4.1

Actual Behavior:
Build fails with duplicate resources error, preventing the AAR from being generated.

Workaround Attempts:

• Tried adding resource exclusions in the packaging block but the issue persists
• The error occurs even with the default autolinking configuration

[hurali97]

Thanks for raising this. I will look into this over a few days 👍

[VigneshPandianB25]

packaging {
jniLibs {
if (!hermesEnabled) {
excludes += "lib/x86/libjsctooling.so"
excludes += "lib/x86_64/libjsctooling.so"
excludes += "lib/armeabi-v7a/libjsctooling.so"
excludes += "lib/arm64-v8a/libjsctooling.so"
}

        // Pick first libworklets.so to resolve conflicts between
        // react-native-reanimated and react-native-worklets
        pickFirsts += "lib/armeabi-v7a/libworklets.so"
        pickFirsts += "lib/arm64-v8a/libworklets.so"
        pickFirsts += "lib/x86/libworklets.so"
        pickFirsts += "lib/x86_64/libworklets.so"
    }
}

in your build.gradle.kts add inside android
then add below code as your library name publishing inside
afterEvaluate {
listOf("mergeReleaseJniLibFolders", "mergeDebugJniLibFolders").forEach { taskName ->
tasks.named(taskName) {
doFirst {
// Remove duplicate libworklets.so from react-native-worklets to avoid conflicts
// with react-native-reanimated which also provides the same library
fileTree("$buildDir/intermediates/exploded-aar/Loyalty_Cobrand/react-native-worklets") {
include("/jni//libworklets.so")
}.forEach { file ->
println("Removing duplicate libworklets.so: ${file.path}")
file.delete()
}
}
}
}
}

[marcinszalski-callstack]

@hidaeraldo

would it help if you'd add the following snippet into .../apps/RNApp/android/BrownfieldLib/build.gradle.kts:

afterEvaluate {
    tasks.matching { it.name.startsWith("package") && it.name.endsWith("Resources") }.configureEach {
        doFirst {
            val buildDir = layout.buildDirectory.get().asFile
            val firebaseValuesFiles = fileTree("$buildDir/intermediates/exploded-aar") {
                include("**/react-native-firebase_messaging/**/res/values/values.xml")
            }.files

            firebaseValuesFiles.forEach { file ->
                if (file.exists()) {
                    println("Removing duplicate colors from: ${file.absolutePath}")
                    var content = file.readText()

                    content = content.replace(Regex("<color\\s+name=\"red\">[^<]*</color>"), "")
                    content = content.replace(Regex("<color\\s+name=\"white\">[^<]*</color>"), "")

                    file.writeText(content)
                }
            }
        }
    }
}