isDefaultRevisionState example

    $tracked_revision_ids = array_reduce(array_map('array_keys', $tracked_revisions), 'array_merge', []);

    // Gather a list of moderation states that don't create a default revision.     $workflow_non_default_states = [];
    foreach ($this->entityTypeManager->getStorage('workflow')->loadByProperties(['type' => 'content_moderation']) as $workflow) {
      /** @var \Drupal\content_moderation\Plugin\WorkflowType\ContentModerationInterface $workflow_type */
      $workflow_type = $workflow->getTypePlugin();
      // Find all workflows which are moderating entity types of the same type       // to those that are tracked by the workspace.       if (array_intersect($workflow_type->getEntityTypes(), array_keys($tracked_revisions))) {
        $workflow_non_default_states[$workflow->id()] = array_filter(array_map(function DContentModerationState $state) {
          return !$state->isDefaultRevisionState() ? $state->id() : NULL;
        }, $workflow_type->getStates()));
      }
    }

    // Check if any revisions that are about to be published are in a     // non-default revision moderation state.     $query = $this->entityTypeManager->getStorage('content_moderation_state')->getQuery()
      ->allRevisions()
      ->accessCheck(FALSE);
    $query->condition('content_entity_revision_id', $tracked_revision_ids, 'IN');

    

'#type' => 'checkbox',
      '#title' => $this->t('Published'),
      '#description' => $this->t('When content reaches this state it should be published.'),
      '#default_value' => isset($state) ? $state->isPublishedState() : FALSE,
      '#disabled' => $is_required_state,
    ];

    $form['default_revision'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Default revision'),
      '#description' => $this->t('When content reaches this state it should be made the default revision; this is implied for published states.'),
      '#default_value' => isset($state) ? $state->isDefaultRevisionState() : FALSE,
      '#disabled' => $is_required_state,
      // @todo Add form #state to force "make default" on when "published" is       // on for a state.       // @see https://www.drupal.org/node/2645614     ];
    return $form;
  }

}

    if ($entity->moderation_state->value) {
      $workflow = $this->moderationInfo->getWorkflowForEntity($entity);
      /** @var \Drupal\content_moderation\ContentModerationState $current_state */
      $current_state = $workflow->getTypePlugin()
        ->getState($entity->moderation_state->value);

      // This entity is default if it is new, the default revision, or the       // default revision is not published.       $update_default_revision = $entity->isNew()
        || $current_state->isDefaultRevisionState()
        || !$this->moderationInfo->isDefaultRevisionPublished($entity);

      // Fire per-entity-type logic for handling the save process.       $this->entityTypeManager
        ->getHandler($entity->getEntityTypeId(), 'moderation')
        ->onPresave($entity, $update_default_revision, $current_state->isPublishedState());
    }
  }

  /** * @param \Drupal\Core\Entity\EntityInterface $entity * The entity that was just saved. * * @see hook_entity_insert() */

// Change the entity's default revision flag and the publishing status only     // if the new workflow state is a valid one.     if ($workflow && $workflow->getTypePlugin()->hasState($moderation_state_id)) {
      /** @var \Drupal\content_moderation\ContentModerationState $current_state */
      $current_state = $workflow->getTypePlugin()->getState($moderation_state_id);

      // This entity is default if it is new, the default revision state, or the       // default revision is not published.       if (!$entity->isSyncing()) {
        $update_default_revision = $entity->isNew()
          || $current_state->isDefaultRevisionState()
          || !$content_moderation_info->isDefaultRevisionPublished($entity);

        $entity->isDefaultRevision($update_default_revision);
      }

      // Update publishing status if it can be updated and if it needs updating.       $published_state = $current_state->isPublishedState();
      if (($entity instanceof EntityPublishedInterface) && $entity->isPublished() !== $published_state) {
        $published_state ? $entity->setPublished() : $entity->setUnpublished();
      }
    }
  }

$entity->setRevisionUserId($this->currentUser()->id());
    }
    $entity->save();

    $this->messenger()->addStatus($this->t('The moderation state has been updated.'));

    $new_state = $this->moderationInfo->getWorkflowForEntity($entity)->getTypePlugin()->getState($new_state);
    // The page we're on likely won't be visible if we just set the entity to     // the default state, as we hide that latest-revision tab if there is no     // pending revision. Redirect to the canonical URL instead, since that will     // still exist.     if ($new_state->isDefaultRevisionState()) {
      $form_state->setRedirectUrl($entity->toUrl('canonical'));
    }
  }

}