private
fun writeExtensionsTo(outputFile: File, packageName: String, targetType: ApiType, extensions: List<KotlinExtensionFunction>): Unit =
    outputFile.bufferedWriter().use { writer ->
        writer.write(fileHeaderFor(packageName, isIncubatingFileClass(targetType, extensions)))
        writer.write("\n")
        extensions.forEach {
            writer.write("\n${it.toKotlinString()}")
        }
    }


/**