Ember js adapter/application js configuration issue for pouchdb

This is the adapter/Application folder.

I was trying to install and configure pouchdb when i started facing a series of errors.

import { Adapter } from 'ember-pouch';
import PouchDB from 'pouchdb';
//import config from 'intern-project/config/environment';
//import Ember from 'ember';

//const { assert, isEmpty } = Ember;

PouchDB.debug.enable('*');

var remote = new PouchDB('http://localhost:5984/offline');
var db = new PouchDB('Patient');

db.sync(remote, {
   live: true,   // do a live, ongoing sync
   retry: true   // retry if the conection is lost

});

export default Adapter.extend({
  db: db
});

Here's the error ...

Uncaught Error: Failed to create an instance of 'adapter:application'. Most likely an improperly defined class or an invalid module export.
    at instantiate (vendor.js:12083)
    at lookup (vendor.js:11941)
    at Container.lookup (vendor.js:11860)
    at Class.lookup (vendor.js:42326)
    at ContainerInstanceCache.instanceFor (vendor.js:103232)
    at ContainerInstanceCache._findInstance (vendor.js:103221)
    at ContainerInstanceCache.get (vendor.js:103209)
    at Class.retrieveManagedInstance (vendor.js:102978)
    at Class.lookupAdapter (vendor.js:102984)
    at Class.adapterFor (vendor.js:102924)

And is there a source that clearly tells how to implement pouchdb along with ember js?