commerce_cart_api-8.x-1.4/tests/modules/commerce_cart_js/commerce_cart_js.module

<?php

/**
 * @file
 * Provides cart block and form replacements using Backbone.js and Underscore.
 */

/**
 * Implements hook_theme().
 */
function commerce_cart_js_theme($existing, $type, $theme, $path) {
  return [
    'commerce_cart_js_block' => [
      'variables' => [],
    ],
  ];
}