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Expo Build Triage
Diagnose failed Expo and React Native builds: reads the build log and project config, classifies the failure, applies verified fixes, and escalates cleanly when it needs hands-on debugging.
Free
expo-build-triage
Example session with this skill installed
My EAS build failed with a Gradle error. Here is my package.json and the log showing 'duplicate-class' errors for some native libraries. How do I fix this?
- Read your context and instructions
- Compiled the expo-build-triage
The build failed during the native Android compilation phase. The log indicates a duplicate-class error caused by two native dependencies shipping the same .so or Java classes, which usually happens when multiple libraries include the same underlying SDK.
Build Diagnosis & Fix
| Metric | Details |
|---|---|
| SDK Version | Expo SDK 50 |
| Failing Phase | Native Build (gradlew) |
| Error Signature | mergeDebugNativeLibs / DuplicateRelativeFileException |
| Root Cause | Conflict between expo-notifications and a third-party analytics library |
To resolve this, we need to instruct Gradle to pick the first occurrence of the conflicting library rather than failing. Modify your app.json to use expo-build-properties:
{
"expo": {
"plugins": [
[
"expo-build-properties",
{
"android": {
"packagingOptions": {
"pickFirst": [
"**/libcrypto.so",
"**/libssl.so"
]
}
}
}
]
]
}
}
Next steps
- Run
npx expo-doctorto ensure no other version conflicts exist. - Run
npx expo prebuild --cleanlocally to verify the config plugin applies without errors. - Trigger a new build with
eas build --profile previewto verify the fix in the cloud environment.
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About this skill
Expo Build Triage is a diagnostic skill for failed Expo and React Native builds. Give your agent a build log and it works from evidence: runs expo-doctor first, matches the error against a known signature table (dependency drift, Gradle native-lib conflicts, Kotlin mismatches, CocoaPods failures, config plugin errors, signing and credential problems, EAS-cloud-only drift, SDK-upgrade breakage), applies one fix at a time with verification, and stops after three failed attempts instead of guessing. Includes a dedicated SDK upgrade mode. Free — and when a build needs hands-on native debugging, it hands off cleanly instead of burning your build minutes.
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