Using with Firebase / Expo query to Cloud Firestore - firebase

Question

So I am trying to keep my code clean and build different files for querying... So I may be taking this harder than it needs to be.
I building a react-native app using Expo CLI.
I have created 3 files, one is my firebase config file,
one is a query file
then the actual file that is using that query.
it looks ok to me... but I get this error.
TypeError: undefined is not an object(evaluating'_firebase.firebase.firestore')
Here is my config file
import * as firebase from "firebase";
import 'firebase/firestore';
const firebaseConfig = {
apiKey: "api-key",
authDomain: "project-id.firebaseapp.com",
databaseURL: "https://project-id.firebaseio.com",
projectId: "project-id",
storageBucket: "project-id.appspot.com",
messagingSenderId: "sender-id",
appId: "app-id",
measurementId: "G-measurement-id"
};
firebase.initializeApp(firebaseConfig);
Then I have a a query file, basically acting as the API layer
import { firebase } from "./firebase";
const db = firebase.firestore();
const getListings = () => {
db.collection("listings").get();
};
export default {
getListings,
};
Then I am trying to view the queried data.
import listingApi from "../api/listings";
function ListingsScreen({ navigation }) {
const [listings, setListings] = useState([]);
useEffect(() => {
loadListings();
}, []);
const loadListings = async () => {
const response = await listingApi.getListings();
setListings(response.data);
};
This is my first time ever using Firebase or cloud firestore... so im really confused.

Answer 1

The error message is telling you that '_firebase.firebase.firestore' data is returning as undefined, this means the document you requested doesn't exist.
At the officiald documentation of Expo, is recommended to put the firebase config information in the same file with your code in order to use firebase, for example:
import * as firebase from 'firebase'
import 'firebase/firestore';
const firebaseConfig = { ... } // apiKey, authDomain, etc. (see above)
firebase.initializeApp(firebaseConfig);
const dbh = firebase.firestore();
dbh.collection("characters").doc("mario").set({
employment: "plumber",
outfitColor: "red",
specialAttack: "fireball"
})