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)
                }
            }
        }
    }
}

[marcin-szalski-ridelink]

no updates here for more than 5 weeks already, @artus9033

[artus9033]

Thanks @marcinszalski-callstack . @hidaeraldo , we couldn't reproduce the issue on our end and since we don't have any reports of it in the newest version, I'll close this one. In case something new would pop out, please let us know.