code: protected function loadBundles($bundles)
      {
          $this->stdout("Collecting source bundles information...\n");
  
          $am = $this->getAssetManager();
          $result = [];
          foreach ($bundles as $name) {
              $result[$name] = $am->getBundle($name);
          }
          foreach ($result as $bundle) {
              $this->loadDependency($bundle, $result);
          }
  
          return $result;
      }
docs: Creates full list of source asset bundles.
  @param string[] $bundles list of asset bundle names
  @return \yii\web\AssetBundle[] list of source asset bundles.