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+<!-- BADGES -->
+![Build Status](https://img.shields.io/github/workflow/status/firebase/firebase-js-sdk/Run%20All%20Tests.svg)
+[![Version](https://img.shields.io/npm/v/firebase.svg?label=version)](https://www.npmjs.com/package/firebase)
+[![Coverage Status](https://coveralls.io/repos/github/firebase/firebase-js-sdk/badge.svg?branch=main)](https://coveralls.io/github/firebase/firebase-js-sdk?branch=main)
+<!-- END BADGES -->
+
+# Firebase - App success made simple
+
+## Upgrade to Version 9
+Version 9 has a redesigned API that supports tree-shaking. Read the [Upgrade Guide](https://firebase.google.com/docs/web/modular-upgrade) to learn more.
+
+## Overview
+
+[Firebase](https://firebase.google.com) provides the tools and infrastructure
+you need to develop, grow, and earn money from your app. This package supports
+web (browser), mobile-web, and server (Node.js) clients.
+
+For more information, visit:
+
+- [Firebase Realtime Database](https://firebase.google.com/docs/database/web/start) -
+  The Firebase Realtime Database lets you store and query user data, and makes
+  it available between users in realtime.
+- [Cloud Firestore](https://firebase.google.com/docs/firestore/quickstart) -
+  Cloud Firestore is a flexible, scalable database for mobile, web, and server
+  development from Firebase and Google Cloud Platform.
+- [Firebase Storage](https://firebase.google.com/docs/storage/web/start) -
+  Firebase Storage lets you upload and store user generated content, such as
+  files, and images.
+- [Cloud Functions for Firebase](https://firebase.google.com/docs/functions) -
+   Cloud Functions for Firebase is a serverless framework that lets you automatically run backend code in response to events triggered by Firebase features and HTTPS requests.
+- [Firebase Cloud Messaging](https://firebase.google.com/docs/cloud-messaging/js/client) -
+  Firebase Cloud Messaging is a cross-platform messaging solution that lets you
+  reliably deliver messages at no cost.
+- [Firebase Performance Monitoring](https://firebase.google.com/docs/perf-mon/get-started-web) -
+  Firebase Performance Monitoring helps you gain insight into your app's performance issues.
+- [Google Analytics](https://firebase.google.com/docs/analytics/get-started?platform=web) -
+  Google Analytics is a free app measurement solution that provides insight on app usage and user engagement.
+- [Remote Config](https://firebase.google.com/docs/remote-config/get-started?platform=web) -
+  Firebase Remote Config is a cloud service that lets you change the behavior and appearance of your 
+  app without requiring users to reload your app.
+- [App Check](https://firebase.google.com/docs/app-check/web/recaptcha-provider) -
+  App Check helps protect your backend resources from abuse, such as billing fraud and phishing. It 
+  works with both Firebase services and your own backends to keep your resources safe.
+- [Create and setup your account](https://firebase.google.com/docs/web/setup) -
+  Get started using Firebase for free.
+
+This SDK is intended for end-user client access from environments such as the
+Web, mobile Web (e.g. React Native, Ionic), Node.js desktop (e.g. Electron), or
+IoT devices running Node.js. If you are instead interested in using a Node.js
+SDK which grants you admin access from a privileged environment (like a server),
+you should use the
+[Firebase Admin Node.js SDK](https://firebase.google.com/docs/admin/setup/).
+
+### Install the SDK
+
+Install the Firebase NPM module:
+```
+$ npm init
+$ npm install --save firebase
+```
+
+### Use Firebase in your app
+
+1. Initialize Firebase in your app and create a Firebase App object:
+```js
+import { initializeApp } from 'firebase/app';
+
+// TODO: Replace the following with your app's Firebase project configuration
+const firebaseConfig = {
+  //...
+};
+
+const app = initializeApp(firebaseConfig);
+```
+
+2. Access Firebase services in your app
+
+Firebase services (like Cloud Firestore, Authentication, Realtime Database, Remote Config, and more) are available to import within individual sub-packages.
+
+The example below shows how you could use the Cloud Firestore Lite SDK to retrieve a list of data.
+
+```js
+import { initializeApp } from 'firebase/app';
+import { getFirestore, collection, getDocs } from 'firebase/firestore/lite';
+// Follow this pattern to import other Firebase services
+// import { } from 'firebase/<service>';
+
+// TODO: Replace the following with your app's Firebase project configuration
+const firebaseConfig = {
+  //...
+};
+
+const app = initializeApp(firebaseConfig);
+const db = getFirestore(app);
+
+// Get a list of cities from your database
+async function getCities(db) {
+  const citiesCol = collection(db, 'cities');
+  const citySnapshot = await getDocs(citiesCol);
+  const cityList = citySnapshot.docs.map(doc => doc.data());
+  return cityList;
+}
+```
+
+### Use a module bundler for size reduction
+
+The Firebase Web SDK is designed to work with module bundlers to remove any
+unused code (tree-shaking). We strongly recommend using this approach for
+production apps. Tools such as the [Angular CLI](//angular.io/cli),
+[Next.js](//nextjs.org/), [Vue CLI](//cli.vuejs.org/), or [Create
+React App](//reactjs.org/docs/create-a-new-react-app.html) automatically
+handle module bundling for libraries installed through npm and imported into
+your codebase.
+
+See [Using module bundlers with Firebase](/docs/web/module-bundling) for more information.
+
+### Script include
+You can also load Firebase packages as script modules in browsers that support native ES modules.
+
+```html
+<!-- use script module by specifying type="module" -->
+<script type="module">
+    import { initializeApp } from 'https://www.gstatic.com/firebasejs/${FIREBASE_VERSION}/firebase-app.js';
+    import { getFirestore, collection, getDocs } from 'https://www.gstatic.com/firebasejs/${FIREBASE_VERSION}/firebase-firestore-lite.js';
+    // Follow this pattern to import other Firebase services
+    // import {} from "https://www.gstatic.com/firebasejs/${FIREBASE_VERSION}/firebase-analytics.js";
+    // import {} from "https://www.gstatic.com/firebasejs/${FIREBASE_VERSION}/firebase-app-check.js";
+    // import {} from "https://www.gstatic.com/firebasejs/${FIREBASE_VERSION}/firebase-auth.js";
+    // import {} from "https://www.gstatic.com/firebasejs/${FIREBASE_VERSION}/firebase-functions.js";
+    // import {} from "https://www.gstatic.com/firebasejs/${FIREBASE_VERSION}/firebase-firestore.js";
+    // import {} from "https://www.gstatic.com/firebasejs/${FIREBASE_VERSION}/firebase-storage.js";
+    // import {} from "https://www.gstatic.com/firebasejs/${FIREBASE_VERSION}/firebase-performance.js";
+    // import {} from "https://www.gstatic.com/firebasejs/${FIREBASE_VERSION}/firebase-remote-config.js";
+    // import {} from "https://www.gstatic.com/firebasejs/${FIREBASE_VERSION}/firebase-messaging.js";
+    // import {} from "https://www.gstatic.com/firebasejs/${FIREBASE_VERSION}/firebase-database.js";
+    
+    // TODO: Replace the following with your app's Firebase project configuration
+    const firebaseConfig = {
+    //...
+    };
+
+    const app = initializeApp(firebaseConfig);
+    const db = getFirestore(app);
+
+    // Get a list of cities from your database
+    async function getCities(db) {
+    const citiesCol = collection(db, 'cities');
+    const citySnapshot = await getDocs(citiesCol);
+    const cityList = citySnapshot.docs.map(doc => doc.data());
+    return cityList;
+    }
+</script>
+```
+
+_Note: To get a filled in version of the above code snippet, go to the
+[Firebase console](https://console.firebase.google.com/) for your app and click on "Add
+Firebase to your web app"._
+
+## Get the code (Node.js - server and command line)
+
+### Install the SDK
+
+While you can write entire Firebase applications without any backend code, many
+developers want to write server applications or command-line utilities using the
+Node.js JavaScript runtime.
+
+You can use the same npm module to use Firebase in the Node.js runtime (on a
+server or running from the command line):
+
+```
+$ npm init
+$ npm install --save firebase
+```
+
+In your code, you can access Firebase using:
+
+```js
+const { initializeApp } = require('firebase/app');
+const { getFirestore, collection, getDocs } = require('firebase/firestore');
+// ...
+```
+
+If you are using native ES6 module with --experimental-modules flag (or Node 12+)
+you should do:
+
+```js
+import { initializeApp } from 'firebase/app';
+import { getFirestore, collection, getDocs } from 'firebase/firestore';
+// ...
+```
+
+Please see [Environment Support](https://firebase.google.com/support/guides/environments_js-sdk) for which packages
+are available in Node.js.
+
+## Compat packages
+Version 9 provides a set of compat packages that are API compatible with Version 8. They are intended to
+be used to make the upgrade to the modular API easier by allowing you to upgrade your app piece by piece.
+See the [Upgrade Guide](https://firebase.google.com/docs/web/modular-upgrade) for more detail.
+
+To access the compat packages, use the subpath `compat` like so:
+```js
+// v9 compat packages are API compatible with v8 code
+import firebase from 'firebase/compat/app';
+import 'firebase/compat/auth';
+import 'firebase/compat/firestore';
+```
+
+## Changelog
+
+The Firebase changelog can be found at
+[firebase.google.com](https://firebase.google.com/support/release-notes/js).
+
+## Browser/environment compatibility
+
+Please see [Environment Support](https://firebase.google.com/support/guides/environments_js-sdk).
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