save_widget example

/** * Creates a widget. * * @since 5.8.0 * * @param WP_REST_Request $request Full details about the request. * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure. */
    public function create_item( $request ) {
        $sidebar_id = $request['sidebar'];

        $widget_id = $this->save_widget( $request, $sidebar_id );

        if ( is_wp_error( $widget_id ) ) {
            return $widget_id;
        }

        wp_assign_widget_to_sidebar( $widget_id, $sidebar_id );

        $request['context'] = 'edit';

        $response = $this->prepare_item_for_response( compact( 'sidebar_id', 'widget_id' ), $request );