in src/main/java/lt/martynassateika/idea/codeigniter/helper/CiHelperUtil.java [95:99]
static List<PsiFileSystemItem> getHelperDirectories(Project project) {
GlobalSearchScope scope = GlobalSearchScope.allScope(project);
PsiFileSystemItem[] items = FilenameIndex.getFilesByName(project, "helpers", scope, true);
return Arrays.stream(items).filter(PsiFileSystemItem::isDirectory).collect(Collectors.toList());
}