isInstallable example

$id = $entity_storage->getIDFromConfigName($name, $entity_storage->getEntityType()->getConfigPrefix());
        // It is possible that secondary writes can occur during configuration         // creation. Updates of such configuration are allowed.         if ($this->getActiveStorages($collection)->exists($name)) {
          $entity = $entity_storage->load($id);
          $entity = $entity_storage->updateFromStorageRecord($entity, $new_config->get());
        }
        else {
          $entity = $entity_storage->createFromStorageRecord($new_config->get());
        }
        if ($entity->isInstallable()) {
          $entity->trustData()->save();
          if ($id !== $entity->id()) {
            trigger_error(sprintf('The configuration name "%s" does not match the ID "%s"', $name, $entity->id()), E_USER_WARNING);
          }
        }
      }
      else {
        $new_config->save(TRUE);
      }
    }
  }

  

/** * {@inheritdoc} */
  public function addDisplay($plugin_id = 'page', $title = NULL, $id = NULL) {
    return $this->storage->addDisplay($plugin_id, $title, $id);
  }

  /** * {@inheritdoc} */
  public function isInstallable() {
    return $this->storage->isInstallable();
  }

  /** * {@inheritdoc} */
  public function setThirdPartySetting($module, $key, $value) {
    return $this->storage->setThirdPartySetting($module, $key, $value);
  }

  /** * {@inheritdoc} */