AKHIL BABU
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityViewBuilderTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityViewBuilderTest.php
    $this->assertStringContainsString('Text in Spanish', (string) $rendered_reference_field_spanish);
  }

+  /**
+   * Tests a view mode alter on an entity.
+   */
+  public function testHookEntityTypeViewModeAlter() {
--- a/core/lib/Drupal/Core/Entity/entity.api.php
+++ b/core/lib/Drupal/Core/Entity/entity.api.php
  }
 }

+/**
+ * Change the view mode of a particular entity type that is being displayed.
+ *
+ * @param string $view_mode
+ *   The view_mode that is to be used to display the entity.
+ * @param \Drupal\Core\Entity\EntityInterface $entity
+ *   The entity that is being viewed.
+ *
+ * @ingroup entity_crud
+ */
+function hook_ENTITY_TYPE_view_mode_alter(&$view_mode, \Drupal\Core\Entity\EntityInterface $entity) {
--- a/core/modules/system/tests/modules/entity_test/entity_test.module
+++ b/core/modules/system/tests/modules/entity_test/entity_test.module
  }
 }

+/**
+ * Implements hook_ENTITY_TYPE_view_mode_alter().
+ */
+function entity_test_entity_test_view_mode_alter(&$view_mode, EntityInterface $entity) {
--- a/core/lib/Drupal/Core/Entity/EntityViewBuilder.php
+++ b/core/lib/Drupal/Core/Entity/EntityViewBuilder.php
   */
  protected function getBuildDefaults(EntityInterface $entity, $view_mode) {
    // Allow modules to change the view mode.
-    $this->moduleHandler()->alter('entity_view_mode', $view_mode, $entity);
+    $entityType = $this->entityTypeId;
+    $this->moduleHandler()->alter([$entityType . '_view_mode', 'entity_view_mode'], $view_mode, $entity);