With Firebase Client-Side example

examples/with-firebase/.env.example

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+# TODO. Fill in with Firebase Config
+FIREBASE_API_KEY=
+FIREBASE_AUTH_DOMAIN=
+FIREBASE_DATABASE_URL=
+FIREBASE_PROJECT_ID=
+FIREBASE_STORAGE_BUCKET=
+FIREBASE_MESSAGING_SENDER_ID=
+FIREBASE_APP_ID=

examples/with-firebase/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+.env
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*

examples/with-firebase/README.md

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+# With Firebase Client-Side
+
+This is a simple set up for Firebase for client side applications.
+
+The firebase app is initialized in `firebase/clientApp.js`, to use you just have to import it anywhere in the app
+
+The React Context API is used to provide user state.
+
+## Deploy your own
+
+Deploy the example using [ZEIT Now](https://zeit.co/now):
+
+[![Deploy with ZEIT Now](https://zeit.co/button)](https://zeit.co/import/project?template=https://github.com/zeit/next.js/tree/canary/examples/with-firebase)
+
+## How to use
+
+### Using `create-next-app`
+
+Execute [`create-next-app`](https://github.com/zeit/next.js/tree/canary/packages/create-next-app) with [npm](https://docs.npmjs.com/cli/init) or [Yarn](https://yarnpkg.com/lang/en/docs/cli/create/) to bootstrap the example:
+
+```bash
+npx create-next-app --example with-firebase with-firebase-app
+# or
+yarn create next-app --example with-firebase with-firebase-app
+```
+
+### Download manually
+
+Download the example:
+
+```bash
+curl https://codeload.github.com/zeit/next.js/tar.gz/canary | tar -xz --strip=2 next.js-canary/examples/with-firebase
+cd with-firebase
+```
+
+### Configuration
+
+1. [Create a Firebase project](https://console.firebase.google.com/u/0/) and add a new app to it.
+2. Create a `.env` file and copy the contents of `.env.example` into it:
+
+```bash
+cp .env.example .env
+```
+
+3. Set each variable on `.env` with your Firebase Configuration (found in "Project settings").
+
+Install it and run:
+
+```bash
+npm install
+npm run dev
+# or
+yarn
+yarn dev
+```
+
+Deploy it to the cloud with [ZEIT Now](https://zeit.co/import?filter=next.js&utm_source=github&utm_medium=readme&utm_campaign=next-example) ([Documentation](https://nextjs.org/docs/deployment)).

examples/with-firebase/context/userContext.js

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+import { useState, useEffect, createContext, useContext } from 'react'
+import firebase from '../firebase/clientApp'
+
+export const UserContext = createContext()
+
+export default ({ children }) => {
+  const [user, setUser] = useState(null)
+  const [loadingUser, setLoadingUser] = useState(true) // Helpful, to update the UI accordingly.
+
+  useEffect(() => {
+    // Listen authenticated user
+    const unsubscriber = firebase.auth().onAuthStateChanged(async user => {
+      try {
+        if (user) {
+          // User is signed in.
+          const { uid, displayName, email, photoURL } = user
+          // You could also look for the user doc in your Firestore (if you have one):
+          // const userDoc = await firebase.firestore().doc(`users/${uid}`).get()
+          setUser({ uid, displayName, email, photoURL })
+        } else setUser(null)
+      } catch (error) {
+        // Most probably a connection error. Handle appropiately.
+      } finally {
+        setLoadingUser(false)
+      }
+    })
+
+    // Unsubscribe auth listener on unmount
+    return () => unsubscriber()
+  }, [])
+
+  return (
+    <UserContext.Provider value={{ user, setUser, loadingUser }}>
+      {children}
+    </UserContext.Provider>
+  )
+}
+
+// Custom hook that shorhands the context!
+export const useUser = () => useContext(UserContext)

examples/with-firebase/firebase/clientApp.js

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+import firebase from 'firebase/app'
+import 'firebase/auth' // If you need it
+import 'firebase/firestore' // If you need it
+import 'firebase/storage' // If you need it
+import 'firebase/analytics' // If you need it
+
+const clientCredentials = {
+  apiKey: process.env.FIREBASE_API_KEY,
+  authDomain: process.env.FIREBASE_AUTH_DOMAIN,
+  databaseURL: process.env.FIREBASE_DATABASE_URL,
+  projectId: process.env.FIREBASE_PROJECT_ID,
+  storageBucket: process.env.FIREBASE_STORAGE_BUCKET,
+  messagingSenderId: process.env.FIREBASE_MESSAGING_SENDER_ID,
+  appId: process.env.FIREBASE_APP_ID,
+}
+
+// Check that `window` is in scope for the analytics module!
+if (typeof window !== 'undefined' && !firebase.apps.length) {
+  firebase.initializeApp(clientCredentials)
+  // To enable analytics. https://firebase.google.com/docs/analytics/get-started
+  if ('measurementId' in clientCredentials) firebase.analytics()
+}
+
+export default firebase

examples/with-firebase/next.config.js

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+// On production, variables are set with `now secrets`. On development, they use the .env file
+require('dotenv').config()
+
+module.exports = {
+  env: {
+    FIREBASE_API_KEY: process.env.FIREBASE_API_KEY,
+    FIREBASE_AUTH_DOMAIN: process.env.FIREBASE_AUTH_DOMAIN,
+    FIREBASE_DATABASE_URL: process.env.FIREBASE_DATABASE_URL,
+    FIREBASE_PROJECT_ID: process.env.FIREBASE_PROJECT_ID,
+    FIREBASE_STORAGE_BUCKET: process.env.FIREBASE_STORAGE_BUCKET,
+    FIREBASE_MESSAGING_SENDER_ID: process.env.FIREBASE_MESSAGING_SENDER_ID,
+    FIREBASE_APP_ID: process.env.FIREBASE_APP_ID,
+  },
+}

examples/with-firebase/now.json

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+{
+  "build": {
+    "env": {
+      "FIREBASE_API_KEY": "@firebase-api-key",
+      "FIREBASE_AUTH_DOMAIN": "@firebase-auth-domain",
+      "FIREBASE_DATABASE_URL": "@firebase-database-url",
+      "FIREBASE_PROJECT_ID": "@firebase-project-id",
+      "FIREBASE_STORAGE_BUCKET": "@firebase-storage-bucket",
+      "FIREBASE_MESSAGING_SENDER_ID": "@firebase-messaging-sender-id",
+      "FIREBASE_APP_ID": "@firebase-app-id"
+    }
+  }
+}

examples/with-firebase/package.json

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+{
+  "name": "with-firebase",
+  "version": "0.1.0",
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start"
+  },
+  "dependencies": {
+    "firebase": "7.11.0",
+    "next": "latest",
+    "react": "^16.13.0",
+    "react-dom": "^16.13.0"
+  },
+  "devDependencies": {
+    "dotenv": "8.2.0"
+  }
+}

examples/with-firebase/pages/_app.js

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+import UserProvider from '../context/userContext'
+
+// Custom App to wrap it with context provider
+export default ({ Component, pageProps }) => (
+  <UserProvider>
+    <Component {...pageProps} />
+  </UserProvider>
+)