Declaration emit for this file requires using private name

trying to export to npm some code that uses immutable

```ts
import { Map } from "https://deno.land/x/uriva_immutable2@4.3.4/mod.ts";
```

during type checking I get a lot of errors like this:
```
error TS9005: Declaration emit for this file requires using private name 'IndexedCollection'. An explicit type annotation may unblock declaration emit.
```