RequiresWindowSdkExtension

@MustBeDocumented
@Retention(value = AnnotationRetention.BINARY)
@Target(allowedTargets = [AnnotationTarget.CLASS, AnnotationTarget.FUNCTION, AnnotationTarget.PROPERTY_GETTER, AnnotationTarget.PROPERTY_SETTER, AnnotationTarget.CONSTRUCTOR, AnnotationTarget.FIELD, AnnotationTarget.PROPERTY])
annotation RequiresWindowSdkExtension

import androidx.window.RequiresWindowSdkExtension
import androidx.window.WindowSdkExtensions

// Given that there's an API required Window SDK Extension version 3
@RequiresWindowSdkExtension(3) fun coolFeature() {}

// Developers can use @RequiresWindowSdkExtension to annotate their own functions to document
// the required minimum API level.
@RequiresWindowSdkExtension(3)
fun useCoolFeatureNoCheck() {
    coolFeature()
}

// Then users know they should wrap the function with version check
if (WindowSdkExtensions.getInstance().extensionVersion >= 3) {
    useCoolFeatureNoCheck()
}