in TransformCore/src/main/java/com/facebook/ads/injkit/AnnotationProcessorImpl.java [156:167]
private static void addRecursive(File file, List<File> files) {
if (file.isFile()) {
files.add(file);
} else if (file.isDirectory()) {
File[] contents = file.listFiles();
if (contents != null) {
for (File f : contents) {
addRecursive(f, files);
}
}
}
}