Issue #3261847: Add helpful methods to compute the difference between two ComposerUtility objects

src/Validator/StagedProjectsValidator.php

@@ -131,21 +131,6 @@ final class StagedProjectsValidator implements EventSubscriberInterface {
     }
   }
 
-  /**
-   * Checks if a given package is a Drupal package.
-   *
-   * @param \Composer\Package\PackageInterface $package
-   *   The package to check.
-   *
-   * @return bool
-   *   TRUE if the package is a recognized Drupal package type (drupal-module,
-   *   drupal-theme, drupal-custom-module, or drupal-custom-theme), otherwise
-   *   FALSE.
-   */
-  protected function isDrupalPackage(PackageInterface $package): bool {
-    return array_key_exists($package->getType(), $this->getTypeMap());
-  }
-
   /**
    * {@inheritdoc}
    */