javascript - define function for constants in angularjs -

i'm trying define function hold constant not working

(function(){ 'use strict';  angular     .module('app')     .constant('config1', config1)     .constant('config2',          (function(){             return {                 version: 2             }         }())     );  function config1() {     return {         version: '1'     } };  })(); 

console.log(config1.version); // undefined

console.log(config2.version); // 2

i think u missed config1**()**.version;