add_action( 'vc_before_init', 'your_name_integrateWithVC' );
function your_name_integrateWithVC() {
 vc_map( array(
  "name" => __( "Bar tag test", "my-text-domain" ),
  "base" => "bartag",
  "class" => "",
  "category" => __( "Content", "my-text-domain"),
  'admin_enqueue_js' => array(get_template_directory_uri().'/vc_extend/bartag.js'),
  'admin_enqueue_css' => array(get_template_directory_uri().'/vc_extend/bartag.css'),
  "params" => array(
 array(
  "type" => "textarea_raw_html",
  "holder" => "div",
  "class" => "",
  "heading" => __( "Text", "my-text-domain" ),
  "param_name" => "content",
  "value" => __( "Default param value", "my-text-domain" ),
  "description" => __( "Description for foo param.", "my-text-domain" )
 )
  )
 ) );
}