Tengo este código para obtener los datos de la base de datos. Pero recibí este error "La propiedad 'db' no existe en el tipo '() => Promise'.ts" en firebase.db ¿Cómo debo reescribirlo?

 import './services/firebase'; import * as Font from 'expo-font'; import * as SplashScreen from 'expo-splash-screen'; import { StatusBar } from 'expo-status-bar'; import React, { useState, useEffect, useCallback } from 'react'; import AntDesign from '@expo/vector-icons/AntDesign'; import { StyleSheet, Text, View, TouchableOpacity } from 'react-native'; import Moment from 'react-moment'; import 'moment/locale/uk'; import DateSlider from './components/date_slider'; import LessonList from './components/lesson_list' import Lessons_local from './components/data.json'; import theme from './assets/themes'; import { firebase } from './services/firebasedb'; export default function App() { const [appIsReady, setAppIsReady] = useState(false); const [index, setIndex] = useState(0); const [lessons, setLessons] = useState(); useEffect(() => { async function prepare() { try { await SplashScreen.preventAutoHideAsync(); await Font.loadAsync(AntDesign.font); let data = await firebase.db.ref('UpcomingGames').once('value', snapshot => { data = snapshot.val() console.log('upcoming t2',data) return data }) setLessons(data); } catch (e) { console.warn(e); } finally { setAppIsReady(true); } } prepare(); }, []);