TypeScript importing from external module breaks my declaration file

I want to create declaration file for global API interfaces in my main app but some of the interfaces are located in the external core module that I created for sharing same interfaces between platforms.

node_modules/@myproject/core/build/index.d.ts:

...
export interface ISession {
  id: string;
  output: string[];
}
...

types/store.d.ts:

import { ISession } from '@bothosting/api';

declare interface ISessionState {
  list: ISession[];
}

Whenever I import ISession it breaks the whole file and other interfaces in store.d.ts becomes unusable too. I've tried adding reference in declaration and source files but didn't work.

via İbrahim Duran