Looking at upgrading your react native project to fix Xcode 11 build issue, follow these simple steps: (this took me quite a while at first try 😞)

1. Upgrade react-native-community/cli by running npm install -g @react-native-community/cli or yarn add @react-native-community/cli

2. Then run react-native upgrade 0.59.10

3. Fix all conflicts and merge where necessary

4. In package.json file make sure react is at version 16.8.3 and react-native is 0.59.10

5. In android -> gradle.properties add android.useAndroidX=true and android.enableJetifier=true

6. For IOS, in Build Phases -> Link Binary With Libraries, add JavaScriptCore.framework

7. Clear node_modules(rm -rf node_modules) and run-react-native androidand react-native run-ios

8. If you're using AsyncStorage, ListView, Slider, make sure to install libraries

Possible Errors

1. Error: Command failed: ./gradlew app:installDebug -PreactNativeDevServerPort=8081 Fix In android -> app -> build.gradle paste this inside android{} such that you have

android{
    ...
   packagingOptions {
       pickFirst 'lib/x86/libc++_shared.so'
       pickFirst 'lib/x86_64/libjsc.so'
       pickFirst 'lib/arm64-v8a/libjsc.so'
       pickFirst 'lib/arm64-v8a/libc++_shared.so'
       pickFirst 'lib/x86_64/libc++_shared.so'
       pickFirst 'lib/armeabi-v7a/libc++_shared.so'
    }
}