Soy un principiante en angular e intento comunicar mi aplicación con firebase, usando las últimas versiones de angular y firebase.

Mi código:

 export class ClientService { clientsCollection: AngularFirestoreCollection<Client>; clientDoc: AngularFirestoreDocument<Client>; clients: Observable<Client[]> client: Observable<Client> constructor(private afs: AngularFirestore) { this.clientsCollection = this.afs.collection<Client>('clients', ref => ref.orderBy('nom')) } getClients(): Observable<Client[]> { //Get id of clients this.clients = this.clientsCollection.snapshotChanges().map(changes => { return changes.map(action => { const data = action.payload.doc.data() as Client; const id = action.payload.doc.id; return { id, data } }) }) return this.clients; } }

me sale este error:

 12 client: Observable<Client> ~~~~~~ Error: src/app/services/client.service.ts:18:61 - error TS2339: Property 'map' does not exist on type 'Observable<DocumentChangeAction<Client>[]>'. 18 this.clients = this.clientsCollection.snapshotChanges().map(changes => { ~~~ Error: src/app/services/client.service.ts:18:65 - error TS7006: Parameter 'changes' implicitly has an 'any' type. 18 this.clients = this.clientsCollection.snapshotChanges().map(changes => { ~~~~~~~ Error: src/app/services/client.service.ts:19:26 - error TS7006: Parameter 'action' implicitly has an 'any' type. 19 return changes.map(action => { ~~~~~~ × Failed to compile.