React-Native：Firebase 错误：没有创建 Firebase App [DEFAULT] - 调用 Firebase App.initializeApp() (app/no-app)答案

【问题标题】：React-Native: Firebase Error: No Firebase App [DEFAULT] has been created - call Firebase App.initializeApp() (app/no-app)React-Native：Firebase 错误：没有创建 Firebase App [DEFAULT] - 调用 Firebase App.initializeApp() (app/no-app)
【发布时间】：2022-11-07 03:30:46
【问题描述】：

当我尝试将 firebase 与我的 React Native 应用程序连接时，我收到了这个错误。

Firebase 错误：没有创建 Firebase 应用 [DEFAULT] - 调用 Firebase App.initializeApp() (app/no-app)

我在这里添加了我的代码-

    import { initializeApp } from "firebase/app";
    import { getAuth } from "firebase/auth";
    import { getFirestore } from "firebase/firestore";

   // Your web app's Firebase configuration
const RNfirebaseConfig = {
  apiKey: "........",
  authDomain: "note-app-rn.firebaseapp.com",
  projectId: "note-app-rn",
  storageBucket: "note-app-rn.appspot.com",
  messagingSenderId: ".....",
  appId: "......"
};

const app = initializeApp(RNfirebaseConfig);
export const auth = getAuth(app);
export const db = getFirestore(app);

【问题讨论】：

标签： reactjs firebase react-native firebase-authentication

【解决方案1】：

尝试这个，

import firebase from '@react-native-firebase/app';
import '@react-native-firebase/auth';
import '@react-native-firebase/firestore';

const RNfirebaseConfig = {
  apiKey: "........",
  authDomain: "note-app-rn.firebaseapp.com",
  projectId: "note-app-rn",
  storageBucket: "note-app-rn.appspot.com",
  messagingSenderId: ".....",
  appId: "......"
};

let app;
if (firebase.apps.length === 0) {
    app = firebase.initializeApp(RNfirebaseConfig )
} else {
    app = firebase.app()
}

const db = firebase.firestore();
const auth = firebase.auth();

【讨论】：

谢谢你的回答 Shivam，我试过了，但是这个问题发生了-Unable to resolve module @react-native-firebase/auth from D:App-Developmentirebase-authApp.js: @react-native-firebase/auth could not be found within the project or in these directories: node_modules``
安装 @react-native-firebase/auth npm i @react-native-firebase/auth ， @react-native-firebase/firestore npm i @react-native-firebase/firestore 和 @react-native-firebase/app npm i @react-native-firebase/app

【解决方案2】：

错误的主要来源与初始化配置设置有关。

检查此用法；

import firebase from 'firebase/compat/app'
import 'firebase/compat/auth'
import 'firebase/compat/firestore'

export const firebaseConfig = {
    apiKey: "............",
    authDomain: "............",
    projectId: "............",
    storageBucket: "............",
    messagingSenderId: "............",
    appId: "............",
    measurementId: "............"
}

if (!firebase.apps.length){
    firebase.initializeApp(firebaseConfig);
}

【讨论】：