b.ts(4,1): error TS4032: Property 'val' of exported interface has or is using name 'I' from private module '"a"'.


==== a.ts (0 errors) ====
    interface I {}
    export function f(): I { return null as I; }
==== b.ts (1 errors) ====
    import {f} from "./a";
    
    export function q() {}
    q.val = f();
    ~~~~~
!!! error TS4032: Property 'val' of exported interface has or is using name 'I' from private module '"a"'.
    