wp_enqueue_scripts example

protected function wp_die( $ajax_message, $message = null ) {
        if ( $this->doing_ajax() ) {
            wp_die( $ajax_message );
        }

        if ( ! $message ) {
            $message = __( 'Something went wrong.' );
        }

        if ( $this->messenger_channel ) {
            ob_start();
            wp_enqueue_scripts();
            wp_print_scripts( array( 'customize-base' ) );

            $settings = array(
                'messengerArgs' => array(
                    'channel' => $this->messenger_channel,
                    'url'     => wp_customize_url(),
                ),
                'error'         => $ajax_message,
            );
            ?> <script> ( function( api, settings ) { var preview = new api.Messenger( settings.messengerArgs ); preview.send( 'iframe-loading-error', settings.error ); } )( wp.customize,