void (@NotNull Module module, @NotNull List<? super PsiFile> files) { final ModuleFileIndex idx = ModuleRootManager.getInstance(module).getFileIndex(); final VirtualFile[] roots = ModuleRootManager.getInstance(module).getContentRoots(); for (final VirtualFile root : roots) { ApplicationManager.getApplication().runReadAction(() -> { idx.iterateContentUnderDirectory(root, dir -> { if (dir.isDirectory()) { final PsiDirectory psiDir = PsiManager.getInstance(module.getProject()).findDirectory(dir); if (psiDir != null) { findFiles(files, psiDir, false); } } return true; }); }); } }