TypeAliases moved outside of external declarations files are lost

[Schahen]

Following code

declare module "hey" {
    interface Api {}
    type App = Api;
    function createApp(): App;
}

is converted to:

external interface Api

external fun createApp(): App

And fails since App is not defined.
However we used to move type aliases outside of JsModule-annotated file and this logic is obviously lost.

[Schahen]

not a bug, was a build problem however investigation helped to pinpoint some different issues.