/Javascript/AngularJS/AngularFireDatabase is not a observable??

AngularFireDatabase is not a observable??

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

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