[Bug]: Android build fails on AGP 8.9+ (RN 0.86): mapbox-v11-compat / rn-compat Kotlin sources not compiled

[joaquinvaz]

Mapbox Version

default

React Native Version

0.86.0

Platform

Android

@rnmapbox/maps version

10.3.2

Standalone component to reproduce

Summary

On AGP 8.9+ (pulled in by React Native 0.86 / Gradle 8.x), the Kotlin sources under android/src/main/mapbox-v11-compat/v11 and android/src/main/rn-compat/rn75 are silently excluded from compilation. android/build.gradle registers these directories only via java.srcDirs, and AGP 8.9+ no longer feeds extra java.srcDirs into the Kotlin compile task. The result is unresolved-reference build errors for the v11compat and rncompat packages.

Environment

• @rnmapbox/maps: 10.3.2
• React Native: 0.86.0 (New Architecture enabled)
• Gradle: 8.14.3 (AGP 8.9+)
• Kotlin Gradle Plugin: (AGP-bundled)

Current code

android/build.gradle:

sourceSets {
    main {
        java.srcDirs = ['src/main/java']
        java.srcDirs += 'src/main/mapbox-v11-compat/v11'
        java.srcDirs += 'src/main/rn-compat/rn75'
        ...
    }
}

Both appended directories contain .kt files (e.g. mapbox-v11-compat/v11/.../MapboxMap.kt, OfflineManager.kt; rn-compat/rn75/.../Dynamic.kt, ReadableMap.kt).

Root cause

With AGP 8.9+, appending a directory to java.srcDirs no longer implicitly adds it as a Kotlin source root for the compileKotlin task. The .kt files above are therefore never compiled, and any consumer of those packages fails to resolve.

Suggested fix

Also register the directories as Kotlin source dirs:

sourceSets {
    main {
        java.srcDirs = ['src/main/java']
        java.srcDirs += 'src/main/mapbox-v11-compat/v11'
        java.srcDirs += 'src/main/rn-compat/rn75'

        kotlin {
            srcDir 'src/main/mapbox-v11-compat/v11'
            srcDir 'src/main/rn-compat/rn75'
        }
        ...
    }
}

(The same likely applies to any other mapbox-v11-compat / rn-compat variant selected for a different RN/Mapbox combination.)

Workaround

Patching android/build.gradle with the kotlin { srcDir ... } block above (via yarn patch / patch-package) resolves the build for us on RN 0.86.

Observed behavior and steps to reproduce

No response

Expected behavior

No response

Notes / preliminary analysis

No response

Additional links and references

No response

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