Disabling mapping file uploads with Crashlytics

One of the more famous crash reporting tools used in Android development is probably Crashlytics. It offers up a lot of insight into an app’s performance – from device characteristics to insights on issue commonalities. If, like my current project, obfuscation is enabled in an app, Crashlytics has a Gradle plugin that uploads the mapping file so that we end up with readable crash reports.

There are times though where I may not want to upload the mapping file, like if I am just debugging an issue locally. According to the official documentation, the way to do this is to add this configuration to the build.gradle.kts file:

firebaseCrashlytics {
    mappingFileUploadEnabled = false
}

However, when I tried it with v2.8.1 of the Crashlytics Gradle plugin, I get an unresolved reference error:

Unresolved reference error

The correct syntax for Kotlin Gradle DSL is somewhat buried in a comment in this Github issue:

import com.google.firebase.crashlytics.buildtools.gradle.CrashlyticsExtension

buildTypes{
    getByName("debug") {
        ...
        configure<CrashlyticsExtension> {
            mappingFileUploadEnabled = false 
        }
    }
}

It’s unfortunate that the official documentation hasn’t been updated in the eight months since this issue has been known (apparently it appeared in v2.6.0 of the plugin), but such is life.