replaced StateMap and Stylesheet interface declaration with type declaration

[wtfil]

Hi.
I am trying to create stylable stateless component

import * as React from 'react';
import {SBStateless} from 'stylable-react-component';
import styles from './styles.st.css';

export const MyComponent = SBStateless(
    (props) => {
        return (...);
    },
    styles
);

But I receive error like

error TS4023: Exported variable 'MyComponent' has or is using name 'Stylesheet' from external module "...PATH.../node_modules/stylable/dist/src/runtime" but cannot be named.

I made some research and found this issue, which said that I either have to add explicit import of Stylesheet in my component or let compiler add type declaration automatically.
I prefer the second option but this require the update type declaration. As far I know, type and interface has only different that type will not create actual alias name, so compiler could use this.

[AviVahl]

Does the validation error occur if you give MyComponent an explicit type?
for example:
https://github.com/wix/stylable-components/blob/master/src/components/drop-down/drop-down.tsx#L29

I'm not sure how I feel about using type (rather than interface) to work around d.ts generation issues.

[AviVahl]

Also, TS 2.6 is expected to address it, as far as I can see (was added to the milestone).
The compiler will add the imports to the .d.ts automatically.
microsoft/TypeScript#9944

[wtfil]

@AviVahl no, it does not. Thx!
I think i can use that for now, and probably this PR is not relevant