class InsertCommand

class InsertCommand implements CommandInterface, CommandWithAttachedAssetsInterface {
    use CommandWithAttachedAssetsTrait;
    
    /**
     * A CSS selector string.
     *
     * If the command is a response to a request from an #ajax form element then
     * this value can be NULL.
     *
     * @var string|null
     */
    protected $selector;
    
    /**
     * The content for the matched element(s).
     *
     * Either a render array or an HTML string.
     *
     * @var string|array
     */
    protected $content;
    
    /**
     * A settings array to be passed to any attached JavaScript behavior.
     *
     * @var array
     */
    protected $settings;
    
    /**
     * Constructs an InsertCommand object.
     *
     * @param string|null $selector
     *   A CSS selector.
     * @param string|array $content
     *   The content that will be inserted in the matched element(s), either a
     *   render array or an HTML string.
     * @param array $settings
     *   An array of JavaScript settings to be passed to any attached behaviors.
     */
    public function __construct($selector, $content, ?array $settings = NULL) {
        $this->selector = $selector;
        $this->content = $content;
        $this->settings = $settings;
    }
    
    /**
     * Implements Drupal\Core\Ajax\CommandInterface:render().
     */
    public function render() {
        return [
            'command' => 'insert',
            'method' => NULL,
            'selector' => $this->selector,
            'data' => $this->getRenderedContent(),
            'settings' => $this->settings,
        ];
    }

}