Theme Module error

Using VS 2017, the typescript compiler gives me an error in the theme.module.ts.
`const NB_THEME_PROVIDERS = [
...NbThemeModule.forRoot(
{
name: 'cosmic',
},
[ DEFAULT_THEME, COSMIC_THEME ],
).providers,
...NbSidebarModule.forRoot().providers,
...NbMenuModule.forRoot().providers,
];`

In the [DEFAULT_THEME, COSMIC_THEME] line tells me that cannot be asigned the arguments to a undefined type.

Any idea?

thanks in advance