Suggestion: Typing module values

I don't know if this was considered yet but since we can pass around modules as values why not offer the ability to specify module types in variables/function signatures?

``` typescript
module Foo {    
    export function bar(a: number, b: number): number {
        return a + b;
    }
}

function foo2(moduleFoo: <ModuleType>) {
    ...
}
```

Kind regards.
