With ES6 modules, the closest thing available to what you want is a namespace import:
import * as foo from './otherClass';
The use it individual exports as
foo.ClassA
You can see the available kinds of imports in the import documentation.
Also, what’s the meaning of the { … } and some of the types being outside and some inside?
That’s for importing named exports. You can read about that in the documentation I referenced or in my answer here.