I have this code, I 'm using Angular 18 : getData(){ const collectionInstance = collection(this.firestore, 'photos'); this.photoData = collectionData(collectionInstance, { idField: 'id' }).pipe( map(dataArray => dataArray.map(data => ({ id: data['id'], title: data['title'], description: data['description'], imageUrl: data['imageUrl'], likes: data['likes'] }) as Photo)) ); } The problems are dataArray and data after map, when I compile I have some messages errors: X [ERROR] TS18046: 'dataArray' is of type 'unknown'. [plugin angular-compiler] src/app/pages/gallery/gallery.component.ts:29:23: 29 │ map(dataArray => dataArray.map(data => ({ and X [ERROR] TS18046: 'data' is of type 'any'. [plugin angular-compiler] src/app/pages/gallery/gallery.component.ts:29:23: 29 │ map(dataArray => dataArray.map(data => ({ I'v tried these options: async getData() { const collectionInstance = collection(this.firestore, 'photos'); const snapshot = await getDocs(collectionInstance); this.photoData = snapshot.docs.map(doc => ({ id: doc.id, ...doc.data() }) as Photo); } Errors: problem with it, is : this.photoData the type 'Photo[]' doesn't have the following type 'Observable<Photo[]>': source, operator, lift, subscribe et de 2 others.ts(2740) Continue reading...