apply the AngularFirebaseDatabase and FirebaseListObservable modules from the 'angularfire2/database'

I've been following a tutorial created a year ago and have encountered some outdated code along the way. Despite searching for solutions, I haven't found one that works for me. Is there a more recent approach to writing the code below?

import {AngularFireDatabase, FirebaseListObservable} from 'angularfire2/database';
import { AngularFireAuth } from "angularfire2/auth";
import { Observable } from "rxjs/Observable";

Here is the error message being displayed:

ERROR in node_modules/rxjs/Observable.d.ts(1,15): error TS2307: Cannot find module 'rxjs-compat/Observable'. src/app/chat-form/chat-form.component.ts(16,15): error TS2339: Property 'sendMessage' does not exist on type 'ChatService'. src/app/services/chat.service.ts(2,30): error TS2305: Module '"C:/Users/Gabriel/stack/School/HVA/JAAR 2/YOUTUBE TYPESCRIPT TUTORIAL/MyAngularApplication/We-chat/node_modules/angularfire2/database/index"' has no exported member 'FirebaseListObservable'. src/app/services/chat.service.ts(4,10): error TS2305: Module '"C:/Users/Gabriel/stack/School/HVA/JAAR 2/YOUTUBE TYPESCRIPT TUTORIAL/MyAngularApplication/We-chat/node_modules/rxjs/Observable"' has no exported member 'Observable'.

javascripttypescriptfirebaseangularfire2angular7

Answer №1

As outlined in the following:

The module '"C:/Users/Gabriel/stack/School/HVA/JAAR 2/YOUTUBE TYPESCRIPT TUTORIAL/MyAngularApplication/We-chat/node_modules/angularfire2/database/index"' doesn't have an exported element called 'FirebaseListObservable'

It appears that angularFire version 5.0 is being used, so it is necessary to refer to the following instructions. The use of FirebaseListObservable has been removed and deprecated from the package. Therefore, you need to implement the following steps:

import { AngularFireDatabase } from 'angularfire2/database';

constructor(afDb : AngularFireDatabase) 
{
  afDb.list<Item>('items').valueChanges().subscribe(console.log);
}

If there is still a preference to utilize FirebaseListObservable, then importing it from 

'angularfire2/database-deprecated'
is necessary.

Refer to this link to view all classes in the package angularfire2/database-depracted:

https://github.com/angular/angularfire2/tree/master/src/database-deprecated

Answer №2

It seems like you may be utilizing Angular 5, which is now deprecated and being replaced by AngularFireList. You should consider switching out FirebaseListObservable with AngularFireList.

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