I was trying to solve the same problem, but found an interesting advice by Basarat Ali Syed, of TypeScript Deep Dive fame, that we should avoid the generic export default declaration for a class, and instead append the export tag to the class declaration. The imported class should be instead listed in the import command of the module.
That is: instead of
class Foo {
// ...
}
export default Foo;
and the simple import Foo from './foo'; in the module that will import, one should use
export class Foo {
// ...
}
and import {Foo} from './foo' in the importer.
The reason for that is difficulties in the refactoring of classes, and the added work for exportation. The original post by Basarat is in export default can lead to problems