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class ExtensionDiscovery extends BaseExtensionDiscovery {

  /**
   * Overrides BaseExtensionDiscovery::scan().
   *
   * Compared to the parent method:
   * - doesn't scan core/ because composer_manager doesn't need to care about
   *   core extensions (core already ships with their dependencies).
   * - scans all sites (to accommodate the poor souls still using multisite).
   */
  public function scan($type, $include_tests = NULL) {
    $searchdirs[static::ORIGIN_SITES_ALL] = 'sites/all';
    $searchdirs[static::ORIGIN_ROOT] = '';
    // Add all site directories, so that in a multisite environment each site
    // gets the necessary dependencies.
    foreach ($this->getSiteDirectories() as $index => $siteDirectory) {
      // The indexes are used as weights, so start at 10 to avoid conflicting
      // with the ones defined in the constants (ORIGIN_CORE, etc).
      $index = 10 + $index;
      $searchdirs[$index] = 'sites/' . $siteDirectory;
    }

    // We don't care about tests.
    $include_tests = FALSE;

    // From this point on the method is the same as the parent.
    $files = [];
    foreach ($searchdirs as $dir) {