TriggerPreviewCommand.php

<?php

namespace Drupal\views\Ajax;

use Drupal\Core\Ajax\CommandInterface;

/**
 * Provides an AJAX command for triggering the views live preview.
 *
 * This command is implemented in Drupal.AjaxCommands.prototype.viewsTriggerPreview.
 */
class TriggerPreviewCommand implements CommandInterface {
    
    /**
     * {@inheritdoc}
     */
    public function render() {
        return [
            'command' => 'viewsTriggerPreview',
        ];
    }

}