A couple of years ago Google deprecated the support libraries in favor of the new AndroidX library. Jetifier is a tool to do this conversion for you if you are using libraries that still depend on those deprecated support libraries. However, doing this conversion every build might be time consuming and it might not even be needed anymore by this time.
Luckily it is very easy to get started! Just add the following dependency to your app
The version at the time of this writing was 1.2.0.
At the end of the same
build.gradle file, apply the plugin.
apply plugin: "com.dipien.byebyejetifier"
You’re all set. Now when you run the Gradle command
./gradlew canISayByeByeJetifier -Pandroid.enableJetifier=false in a terminal, you'll get an output telling you if your project is still depending on Jetifier or not. In my case I still have to do some more maintenance.