foo.js

alert('Herro Wold');

foo_with_angular_services.js

import angular from 'angular'

angular.module('mySledgehammer', ['kibana'])
  .run(function (config) {
    alert(config.get('kbnIndex'));
  });

package.json

{
  "name": "MyHammer",
  "version": "0.1.0",
  "kibana": {
    "sledgehammer": "./foo.js"
  }
}