Getting library "libjsc.so" not found after upgrading React Native to 0.60-RC2

What solved for me was change build.gradle updating packagingOptions to:

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

I encountered a slight variation of this bug, where I had added a third buildType to my gradle config, 'releaseStaging'

The fix in this instance was to add the following line to dependencies in app/build.gradle

releaseStagingImplementation files(hermesPath + "hermes-release.aar")

Add below in your app/build.gradle

// On top of the file

def useIntlJsc = false

//inside dependencies

 if (useIntlJsc) {
        implementation 'org.webkit:android-jsc-intl:+'
    } else {
        implementation 'org.webkit:android-jsc:+'
    }

I had this issue too. I needed to update the jscFlavor variable inside the build.gradle file from this:

def jscFlavor = 'org.webkit:android-jsc:+'

To this:

def jscFlavor = 'org.webkit:android-jsc-intl:+'

Cheers.