we have some modules published as package, and in this project we need to lazy load the module

if the module in the target project, it's ok , like :

export const routes: Routes = [
{ path: '', redirectTo: 'test01', pathMatch: 'full'},
{ path: 'test01', loadChildren: 'app/testing01/test01.module' },
]

but, how can i load modules from package , like this:
{ path: 'test01', loadChildren: '@xxx/testing01/test01.module' },

i am using

"angular-cli": "1.0.0-beta.15",
@angular 2.0.0

thank you and being in touch