Chris@0: /**
Chris@0:  * Implements hook_block_access().
Chris@0:  */
Chris@0: function {{ machine_name }}_block_access(\Drupal\block\Entity\Block $block, $operation, \Drupal\Core\Session\AccountInterface $account) {
Chris@0:   // Example code that would prevent displaying the 'Powered by Drupal' block in
Chris@0:   // a region different than the footer.
Chris@0:   if ($operation == 'view' && $block->getPluginId() == 'system_powered_by_block') {
Chris@0:     return AccessResult::forbiddenIf($block->getRegion() != 'footer')->addCacheableDependency($block);
Chris@0:   }
Chris@0: 
Chris@0:   // No opinion.
Chris@0:   return AccessResult::neutral();
Chris@0: }