Issue #2991232: Add hasRole method to AccountProxy and UserSession classes

core/lib/Drupal/Core/Session/AccountProxy.php

@@ -98,6 +98,22 @@ public function getRoles($exclude_locked_roles = FALSE) {
     return $this->getAccount()->getRoles($exclude_locked_roles);
   }
 
+  /**
+   * Whether a user has a certain role.
+   *
+   * @param string $rid
+   *   The role ID to check.
+   *
+   * @return bool
+   *   Returns TRUE if the user has the role, otherwise FALSE.
+   *
+   * @todo in Drupal 10, add method to Drupal\Core\Session\AccountInterface.
+   * @see https://www.drupal.org/node/3228209
+   */
+  public function hasRole(string $rid): bool {
+    return $this->getAccount()->hasRole($rid);
+  }
+
   /**
    * {@inheritdoc}
    */