=== tests/cases/compiler/file2.ts ===
import f = require('file1');
>f : typeof f

f.foo();
>f.foo() : any
>f.foo : () => any
>f : typeof f
>foo : () => any

=== tests/cases/compiler/file1.ts ===
export function foo() {
>foo : () => any

var classes = undefined;
>classes : any
>undefined : undefined

    return new classes(null);
>new classes(null) : any
>classes : any
>null : null
}