Why does the build.gradle file of react-native-gesture-handler not need androidx androidx.appcompat: appcompat

[Haibeike01]

I found the react-native-gesture-handler component on github, the version is 1.5.6, it itself supports androidx, some java files in the project (such as react-native-gesture-handler / android / src / main / java / com / swmansion / gesturehandler / react / RNGestureHandlerPackage.java), you can see androidx.annotation.Nullable and other androidx classes, but I installed this component into my project, and the error was: androidx.annotation was not found .Nullable, I am very confused. I looked at the official android / build.gradle and found that the implementation 'androidx.appcompat: appcompat: 1.0.2' is missing.

So I can only add implementation 'androidx.appcompat: appcompat: 1.0.2' to the build-gradle file of react-native-gesture-handler in my project, and the result compiles.
I'm curious, why the official does not introduce this 'androidx.appcompat: appcompat: 1.0.2' dependency, he can still run, but the official RNGestureHandlerPackage and other classes it does need Nullable and other classes that need androidx, does it not Is it wrong?