Module ”*” has no exported member ‘app’

i am working with angular 2 and firebase and ionic, i installed all the npm packages and angularfire2 as well when i do npm serve browser shows the error that

**Module ''*'' has no exported member '**app'.

and /node_modules/angularfire2/angularfire2.d.ts here is the error -

14. export declare function _getFirebase(config: FirebaseAppConfig, appName?: 15. string): firebase.app.App; export declare function _getWindowLocation(): Location;

please help!

via rohit sharma