Bug Report or Feature Request (mark with an x)

- [x] bug report -> please search issues before submitting
- [ ] feature request

Versions.

Windows 7
@angular/cli: 1.0.2
node: 6.9.0
os: win32 x64
@angular/common: 4.1.1
@angular/compiler: 4.1.1
@angular/core: 4.1.1
@angular/forms: 4.1.1
@angular/http: 4.1.1
@angular/platform-browser: 4.1.1
@angular/platform-browser-dynamic: 4.1.1
@angular/router: 4.1.1
@angular/cli: 1.0.2
@angular/compiler-cli: 4.1.1

Repro steps.

ng serve works ok, but aot compilation fails in case:
import module like import { Ng2FlatpickrModule } from 'ng2-flatpickr/lib/ng2-flatpickr.module.js';
-> No errors
import module like import { Ng2FlatpickrModule } from 'ng2-flatpickr;
-> "Please add a @NgModule annotation." error

The log given by the failure.

ERROR in Unexpected value 'Ng2FlatpickrModule in .../node_modules/ng2-flatpickr/lib/ng2-flatpickr.module.js' imported by the module 'AppModule in .../src/app/app.module.t
s'. Please add a @NgModule annotation.

ERROR in ./src/main.ts
Module not found: Error: Can't resolve './$$_gendir/app/app.module.ngfactory' in 'D:\Projects\work\unleesh-frontend\src'
@ ./src/main.ts 6:0-74
@ multi ./src/main.ts

Desired functionality.

There should be no errors

Mention any other details that might be useful.

Here is my fork https://github.com/FriOne/ng2-flatpickr