fn.php

 function hl_theme_icons() {
    return array(
      array( 'hl-icon-commerce' => __( 'Commerce', 'js_composer' ) ),
      array( 'hl-icon-cup-and-plate' => __( 'cup and plate', 'js_composer' ) ),
      array( 'hl-icon-envelope2' => __( 'envelope2', 'js_composer' ) ),
      array( 'hl-icon-facebook2' => __( 'facebook2', 'js_composer' ) ),
      array( 'hl-icon-favorite' => __( 'favorite', 'js_composer' ) ),
    );
  }



  function hl_icon_library_style_enqueue()
  {
    wp_register_style( 'hlicon', get_template_directory_uri() . '/css/hlicon.css', array(), 'v1' );
    wp_enqueue_style( 'hlicon' );
  }
  add_action( 'admin_enqueue_scripts', 'hl_icon_library_style_enqueue' );

  $attributes = array(
    'type' => 'iconpicker',
    'heading' => __( 'Icon', 'js_composer' ),
    'param_name' => 'i_icon_halmritea',
    'settings' => array(
      'emptyIcon' => false,
      'type' => 'halmritea',
      'source' => hl_theme_icons(),
      ),
    'dependency' => array(
      'element' => 'i_type',
      'value' => 'halmritea',
      ),
    'description' => __( 'Select icon from library.', 'js_composer' ),
    );
  vc_add_param( 'vc_btn', $attributes );