Adding off-line capabilities to VBCS mobile application

Summary

error dependency not found

Content

Hi all. I'm new to programming with VBCS.

I'm following tutorial in 

https://blogs.oracle.com/shay/adding-offline-capabilities-to-an-oracle-visual-builder-app

I have an error (dependency not found) for:

 'vbsw/helpers/serviceWorkerHelpers'

and

    'persist/persistenceManager',
    'persist/defaultResponseProxy',
    'persist/persistenceUtils',
    'persist/fetchStrategies',

and

    'persist/impl/logger'

How could I add these dependencies to my app ? Is there a tutorial about this ? 

Thanks and best regards

Paolo