How to import QueryBase in Angular?

I am practicing firebase Real time Database but looking the query Structure I am planning to use the QueryBase https://github.com/davideast/Querybase

so I was just wandering how to deal with it?

I have a service called UserService

export class UsersService {
  private dbPath = '/users';

  usersRef: AngularFireList<User> = null;

 constructor( private db: AngularFireDatabase) {
    this.usersRef = db.list(this.dbPath);
  }

getUserList(): AngularFireList<User> {
   
    return this.db.list('/users', ref => ref.orderByChild('name').equalTo('kushal')

  }

this works perfect filtering by name but I want to filter by multiple fields like name and email.

I know its possible by query base but I don't know how to use use it.

I saw the reference post on stack overflow and documentations but didn't able to make out what imports I need to do and how can I use it?

I know the working structure just need to get started like how can I create querybase ref like

const databaseRef = firebase.database().ref().child('people');

 const querybaseRef = querybase.ref(databaseRef, ['name', 'age', 'location']);

this code is provided in the documentation I am able to make the first line but for getting querybase.ref what I need to do?

EDIT

After running npm command for query base what are the next steps I need to follow to import queryBase to angular project ?