Angular2 typescript import all classes from one file

Question

I am using this kind of structure for folders that contain modules. This is a simplified core folder

-- core
   |-- a.service.ts
   |-- b.service.ts
   |-- c.service.ts
   |-- core.module.ts
   |-- index.ts

The module imports all classes except for index. Index exports all classes.

I like this because from other files, say from components, I can import any service via import {ServiceName} from '../core/index' and I get the nice intellisense list of all services when I start typing within the brackets in the import statement.

This was all nice and well, until I hit the 'unknown dependencies' error for some of the classes the files refer to. Error: (SystemJS) Can't resolve all parameters for DummyComponent: (Http, ?).

The error goes away if I import the service referencing the file directly. import {AService} from '../core/a.service'

I have two questions:

1. Why does this happen? This looks like a circular reference problem. But AService doesn't have any dependencies, so it shouldn't be.
2. How can I achieve this behaviour? What I am trying to emulate is the same as importing HttpModule or Http from @angular/core. I looked at the folder structure and it seems to me it is using the same logic as mine.