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kotlinlang

to mimic that same behavior in kotlinjs:
```
@JsModule("express")
external object express {
    @JsName("call")
    operator fun invoke(): Application

    fun Router(): Router
}
```
allows you to do this in kotlinjs:
```
val router = express.Router()
val app = express()
```

Another way is:
```
@JsModule("express")
external object express {
    fun Router(): Router
}

@JsModule("express")
external fun express(): Application
```

Ah yes, good call. I attempted something like that at first but I was defining express as a `class` with a `companion object` that held `Router` etc. but at that point I couldn’t have `class` and `function` with the same name. However under this setup having an `object` and `fun` with the same presents no issue.