After cloning this repo, tried to compile and run the example on Windows 10 Android emulator:
git clone https://github.com/akshetpandey/react-native-cronet.git
cd react-native-cronet\example
yarn
yarn android
FAILURE: Build completed with 2 failures.
1: Task failed with an exception.
-----------
* Where:
Build file 'E:\Sandbox\react-native-cronet\example\node_modules\react-native\ReactAndroid\build.gradle' line: 220
* What went wrong:
A problem occurred evaluating project ':ReactAndroid'.
> extensionSupplier.get()!!.compileSdkVersion must not be null
2: Task failed with an exception.
-----------
* What went wrong:
A problem occurred configuring project ':ReactAndroid'.
> compileSdkVersion is not specified.