plugins {
    id("com.android.library")
    id("my.ext")
}

android {
	buildFeatures.buildConfig = true

    (this as ExtensionAware).configure<MyProjectExt> {
        envApiKey = "defaultKey"
    }
    buildTypes {
        getByName("debug") {
            configure<MyBuildTypeExt> {
                envApiKey = "debugKey"
            }
        }
        getByName("release") {
            configure<MyBuildTypeExt> {
                envApiKey = "releaseKey"
            }
        }
    }
}

androidComponents.onVariants { variant ->
    variant.buildConfigFields?.put(
        "ENV_API_KEY",
        variant.getExtension(MyVariantExt::class.java)!!.envApiKey.map {
            BuildConfigField("String", "\"$it\"", "env api key")
        }
    )
}