getCoreNames example

  /** * Returns a map of all config object names and their folders. * * @return array * An array mapping config object names with directories. */
  protected function getAllFolders() {
    if (!isset($this->folders)) {
      $this->folders = [];
      $this->folders += $this->getCoreNames();
      // Perform an ExtensionDiscovery scan as we cannot use       // \Drupal\Core\Extension\ExtensionList::getPath() yet because the system       // module may not yet be enabled during install.       // @todo Remove as part of https://www.drupal.org/node/2186491       $listing = new ExtensionDiscovery(\Drupal::root());
      if ($profile = \Drupal::installProfile()) {
        $profile_list = $listing->scan('profile');
        if (isset($profile_list[$profile])) {
          // Prime the \Drupal\Core\Extension\ExtensionList::getPathname static           // cache with the profile info file location so we can use           // \Drupal\Core\Extension\ExtensionList::getPath() on the active

  protected function getAllFolders() {
    if (!isset($this->folders)) {
      $this->folders = [];
      $this->folders += $this->getCoreNames();

      $extensions = $this->configStorage->read('core.extension');
      // @todo Remove this scan as part of https://www.drupal.org/node/2186491       $listing = new ExtensionDiscovery(\Drupal::root());
      if (!empty($extensions['module'])) {
        $modules = $extensions['module'];
        // Remove the install profile as this is handled later.         unset($modules[$this->installProfile]);
        $profile_list = $listing->scan('profile');
        if ($this->installProfile && isset($profile_list[$this->installProfile])) {
          // Prime the \Drupal\Core\Extension\ExtensionList::getPathname()

class TestInstallStorage extends InstallStorage {

  /** * {@inheritdoc} */
  protected function getAllFolders() {
    if (!isset($this->folders)) {
      $this->folders = $this->getCoreNames();
      $listing = new ExtensionDiscovery(\Drupal::root());
      $listing->setProfileDirectories([]);
      $this->folders += $this->getComponentNames($listing->scan('profile'));
      $this->folders += $this->getComponentNames($listing->scan('module'));
      $this->folders += $this->getComponentNames($listing->scan('theme'));
    }
    return $this->folders;
  }

}