old_contents: import MainView from 'views/MainView'
  import SyncView from 'views/SyncView'
  {{#if_eq routerVersion "v4"~}}
  import Loadable from 'react-loadable'
  {{/if_eq}}
  
  export default [
    {
      path: '/',
      component: MainView,
      childRoutes: [
        {
          path: '/sync',
          component: SyncView
        },
        {
          path: '/async',
          {{#if_eq routerVersion "v3"}}
          getComponent (nextState, cb) {
            (async () => {
              const view = await import('views/AsyncView')
              cb(null, view.default)
            })()
          }
          {{/if_eq}}
          {{#if_eq routerVersion "v4"}}
          component: Loadable({
            loader: () => import(`views/AsyncView`),
            // if you have your own loading component,
            // you should consider add it here
            LoadingComponent: () => null
          })
          {{/if_eq}}
        }
      ]
    }
  ]
  
new_contents: 
  
  export default  [  
  ]
  
subject: Update index.js