MaxInterview - angularfiredatabase is not a observable 3f 3f

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1// change to valueChanges()
2constructor(afDb: AngularFireDatabase) {
3  afDb.list('items').subscribe(console.log);
4}
5//to
6constructor(afDb: AngularFireDatabase) {
7  afDb.list<Item>('items').valueChanges().subscribe(console.log);
8}

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o list do angularfiredatabase n c3 a3o c3 a9 mais um observable 3f 3f angularfiredatabase is not a observable 3f 3f