This project shows odd problem with rollup not being able to process imports properly.

Steps to reproduce

1. run npm install
2. run npm run rollup
3. open examples/drag/app.module.js

You will see that module file is missing import for Store

1. Now navigate to examples/drag/lib/TaskStore.js and move last import to the first
2. run npm run rollup again
3. open examples/drag/app.module.js

You will see import is now included

If you navigate to examples/drag/index.html in browser, you will see that store class was actually imported and works - text is rendered to DOM.