Drush script to fix mismatch entity and/or field definitions

fix-mismatch-entities.php

<?php

/**
 * @file
 * Fix mismatch entity and/or field definitions.
 */

$entity_type_manager = \Drupal::entityTypeManager();
$entity_type_manager->clearCachedDefinitions();

$entity_type_ids = [];
$change_summary = \Drupal::service('entity.definition_update_manager')->getChangeSummary();

foreach ($change_summary as $entity_type_id => $change_list) {
  $entity_type = $entity_type_manager->getDefinition($entity_type_id);
  \Drupal::entityDefinitionUpdateManager()->installEntityType($entity_type);
  $entity_type_ids[] = $entity_type_id;
}

if (count($entity_type_ids)) {
  echo t("Installed/Updated the entity type(s): @entity_type_ids", [
    '@entity_type_ids' => implode(', ', $entity_type_ids),
  ]) . PHP_EOL;
}
else {
  echo t("[OK] No entity types were installed/updated.") . PHP_EOL;
}

Run with:

drush scr path/to/fix-mismatch-entities.php