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PWA w/React.js & Firebase

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+JimmyMoon @ragingwind

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- Simple PWA with React.js - App Shell Architecture - Web Manifest - Service Worker - Firebase - Tuning on PRPL - Auditing by Lighthouse

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- create-react-app - (react-scripts < 0.9.5) - Webpack > 2.4.x - PWA features - Minimal snippets - One of the app for guiding PWA

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create-react-app

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> yarn init && tree . └── package.json

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> touch public/index.html && tree . └── public └── index.html

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./public/index.html

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> mkdir -p src/components/ > touch ./src/components/App.js \ ./src/main.js

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> tree . └── src ├── components │ └── App.js └── main.js

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> yarn add react react-dom

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import React from 'react'; import ReactDOM from 'react-dom'; import App from './App.js'; ReactDOM.render(, document.getElementById('app')); ./src/main.js

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import React from 'react'; class App extends React.Component { render() { return (

Hello World !!

); } } ./src/components/App.js

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...

... ./public/index.htm

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> yarn add --dev webpack \ webpack-dev-server > touch webpack.config.js

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module.exports = { entry: { main: ['./src/main.js'], }, output: { path: path.resolve( __dirname, './build'), filename: '[name].js' } ... }; ./webpack.conﬁg.js

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module.exports = { ... devServer: { contentBase: './public', inline: true, host: 'localhost', port: 8080 } }; ./webpack.conﬁg.js

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... ... ./public/index.html

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> yarn add --dev babel-core \ babel-loader \ babel-preset-react-app > touch .babelrc

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{ // babel preset for react app // made by facebook "presets": ["react-app"] } ./.babelrc

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module.exports = { ... module: { loaders: [{ test: /\.(js|jsx)$/, include: path.resolve( __dirname, './src'), loaders: 'babel-loader' }] } }; ./webpack.conﬁg.js

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{ ... // add dev server and build script to package.json "scripts": { "start": "NODE_ENV=development webpack-dev-server", "build": "rm -rf build && NODE_ENV=production webpack -p" }, ... } ./package.json

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> yarn start

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App Shell   Architecture

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> yarn add material-ui \ react-tap-event-plugin > touch ./src/components/AppShell.js

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import reactTabEventPlugin from 'react-tap-event-plugin'; reactTabEventPlugin(); ./src/main.js

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class AppShell extends React.Component { render() { return (

{React.cloneElement(this.props.children)}

); } }; ./src/components/AppShell.js

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import {MuiThemeProvider, getMuiTheme} from 'material-ui/styles'; import {AppBar, Drawer, MenuItem} from 'material-ui'; ./src/components/AppShell.js

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constructor(props) { // drawer open flag this.state = {open: false}; } ./src/components/AppShell.js

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render() { return (

...

); } ./src/components/AppShell.js

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... handleDrawerToggle = () => this.setState({open: !this.state.open}) handleRequestChange = open => this.setState({open: open}) ... ./src/components/AppShell.js

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class App extends React.Component { render() { return (

Hello World !!

); } } ./src/components/AppShell.js

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Web Manifest

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> npm install -g pwa-manifest-cli > pwa-manifest ./public \ --icons=ICONPATH_LOCAL_OR_HTTP

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> tree -L 3 ./public ├── favicon.ico ├── icon-144x144.png ├── icon-192x192.png ├── icon-512x512.png ├── index.html └── manifest.json

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{ "name": "react-pwa", "short_name": "react-pwa", "icons": [ { "src": "icon-144x144.png", "sizes": "144x144", "type": "image/png" }, ... ], "start_url": "./?utm_source=web_app_manifest", "display": "standalone", "orientation": "natural", "background_color": "#FFFFFF", "theme_color": "#3F51B5" } ./public/manifest.json

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./public/index.html

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Service Worker

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> yarn add --dev \ sw-precache-webpack-plugin-loader \ copy-webpack-plugin

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const CopyWebpackPlugin = require('copy-webpack-plugin'); const SWPrecacheWebpackPlugin = require('sw-precache-webpack-plugin-loader'); ./webpack.conﬁg.json

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plugins: [ new CopyWebpackPlugin([{ context: './public', from: '*.*' }]) ] ./webpack.conﬁg.json

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plugins: [ new SWPrecacheWebpackPlugin({ staticFileGlobs: [CACHED_FILES_GLOBS], logger: function () {}, filename: 'sw.js' }) ] ./webpack.conﬁg.json

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if ('serviceWorker' in navigator) { window.addEventListener('load', function() { navigator.serviceWorker.register('sw.js'); }); } ./public/index.html

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More views, React Routing

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> yarn add react-router-dom > touch ./src/components/Home.js > tree ./src/components ├── App.js ├── AppShell.js └── Home.js

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import {Card, CardTitle, CardText} from 'material-ui/Card'; ./src/components/Home.js

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class Home extends React.Component { render () { return ( ... ) } } ./src/components/Home.js

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import {HashRouter as Router, Route} from 'react-router-dom'; import Home from './Home'; ./src/components/App.js

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class App extends React.Component { render() { return (

Hello World !!

); } } ./src/components/App.js

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> touch ./src/components/Users.js > touch ./src/components/Notification.js > tree ./src/components ├── App.js ├── AppShell.js ├── Home.js ├── Users.js └── Notification.js

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import React from 'react'; class Users extends React.Component { render() { return (

Users

); } } export default Users; ./src/components/Users.js

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import React from 'react'; class Notification extends React.Component { render() { return (

Notification

); } } export default Notification; ./src/components/Notiﬁcation.js

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import Users from './Users'; import Notification from './Notification'; ./src/components/App.js

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./src/components/App.js

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import {Link} from 'react-router-dom'; ... } onClick={this.handleDrawerToggle} /> } onClick={this.handleDrawerToggle} /> ./src/components/AppShell.js

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Firebase Hosting with HTTPS

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> npm install -g firebase-tools

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> tree -L 1 ./ -a -I node_modules ├── .babelrc ├── .firebaserc ├── firebase.json ├── package.json ├── public ├── src ├── webpack.config.js └── yarn.lock

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{ "hosting": { "public": "build" } } ./ﬁrebase.json

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{ "projects": { "default": "YOUR-PROJECT-NAME" } } ./.ﬁrebaserc

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> yarn build > tree -L 1 ./ -a -I node_modules ├── favicon.ico ├── icon-144x144.png ├── icon-192x192.png ├── icon-512x512.png ├── index.html ├── main.js ├── manifest.json ├── notification.js └── sw.js

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Firebase Realtime Database

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class Users extends React.Component { constructor() { super(); this.state = { users: [] }; } } ./src/components/Users.js

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componentDidMount() { const databaseURL = 'https: //YOUR_DATABASE_URL'; fetch(`${databaseURL}/data.json/`).then(res => { if (res.status !== 200) { throw new Error(res.statusText); } return res.json(); }).then(users => this.setState({users: users})) } ./src/components/Users.js

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render() { const users = () => { return Object.keys(this.state.users).map(id => { const user = this.state.users[id]; return ( ); }); } return (

{users()}

); } ./src/components/Users.js

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plugins: [ new SWPrecacheWebpackPlugin({ ... runtimeCaching: [{ urlPattersn: /https:\/\/.+.firebaseio.com/, handler: 'networkFirst' }] }) ] ./webpack.conﬁg.js

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Firebase Cloud Messaging

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> yarn add firebase

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{ gcm_sender_id: "103953800507", ... }; ./manifest.json

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import firebase from 'firebase'; ./src/components/Notiﬁcation.js

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var config = { apiKey: "AIzasdakagskgei@#9412i8123WWEeFwyuOk4af3vhYFw", authDomain: "YOURPROJECT.firebaseapp.com", databaseURL: "https: //YOURPROJECT.firebaseio.com", projectId: "YOURPROJECT", storageBucket: "YOURPROJECT.appspot.com", messagingSenderId: "2595534347235" }; ./src/components/Notiﬁcation.js

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class Notification extends React.Component { static firebaseApp; constructor(props) { super(props); if (!Notification.firebaseApp) { firebase.initializeApp(config); } } } ./src/components/Notiﬁcation.js

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class Notification extends React.Component { constructor(props) { ... this.state = { token: '', message: '' }; } } ./src/components/Notiﬁcation.js

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componentDidMount() { const messaging = firebase.messaging(); messaging.onMessage(this.handlePushMessage); messaging.requestPermission() .then(() => messaging.getToken()) .then(token => this.setState({token: token})) .catch(err => { throw new Error(err); }); } ./src/components/Notiﬁcation.js

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handlePushMessage = noti => { this.setState({ message: `${noti.title}: ${noti.body}` }); } ./src/components/Notiﬁcation.js

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render() { return (

); } ./src/components/Notiﬁcation.js

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> touch ./src/firebase-messaging-sw.js > tree -L 1 ./src -I node_modules ├── components ├── firebase-messaging-sw.js └── main.js

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importScripts('https: // www.gstatic.com/firebasejs/3.5.2/firebase-app.js'); importScripts('https: // www.gstatic.com/firebasejs/3.5.2/firebase-messaging.js'); ./src/ﬁrebase-messaging-sw.js

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plugins: [ new CopyWebpackPlugin([{ ... }, { from: './src/firebase-messaging-sw.js', to: 'firebase-messaging-sw.js', }]), ] ./webpack.conﬁg.js

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> npm install -g fcm-cli

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> fcm send --server-key SERVER_KEY:bKFlxhMqS_PYGlCw4VTV \ --to TOKEN:A91bFmi_DEQFPQ2FMf_7V8NcEGGqkAZEV- \ --notification.title hi \ --notification.body 'Hello World'

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Tuning on PRPL Pattern

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(P)ush critical resources for the initial route (R)ender initial route and get it interactive as soon as possible, (P)re-cache components for the remaining routes (L)azy-load, and create next routes on demand by user

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Kicking Mega Bundle

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Breaking down Common Chunks

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module.exports = { entry: { main: ['./src/main.js'], vendor: ['react', 'react-dom'] }, plugins: [ new webpack.optimize.CommonsChunkPlugin({ name: 'vendor' }), ] } ./webpack.conﬁg.js

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./public/index.html

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Routes based Code-splitting

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> yarn add --dev babel-plugin-syntax- dynamic-import

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{ "plugins": [ "syntax-dynamic-import" ] } ./.babelrc

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export default (getComponent) => ( class AsyncComponent extends React.Component { componentWillMount() { if (!this.state.Component) { getComponent().then(Component => { AsyncComponent.Component = Component this.setState({ Component }) }); } }. ... } ); ./src/components/AsyncComponent.js

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import asyncComponent from './AsyncComponent'; const Home = asyncComponent(() => { return import( /* webpackChunkName: "home" */ './Home') .then(module => module.default); }); const Users = ...' const Notification = ...; ./src/components/App.js

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Tree-shaking, Dead-code elimination Live-code Importing

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import {Card, CardHeader} from 'material-ui'; import {Card, CardHeader} from 'material-ui/Card';

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> yarn add --dev babel-preset-es2015 babel- plugin-transform-imports

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{ "presets": [["es2015", {"modules": false}], "react-app"] } ./.babelrc

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"plugins": [ [ "transform-imports", { "material-ui": { "transform": "material-ui/${member}", "preventFullImport": true }, "react-router-dom": { ...}, "lodash": { ...} } ] ] ./.babelrc

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494 kB

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Extract common parts Shared Common Chunk

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plugins: [ new webpack.optimize.CommonsChunkPlugin({ children: true, async: 'common', minChunks: 2 }), ] ./webpack.conﬁg.js

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./public/index.html

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Control resources pushing Preload, Prefetch

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> yarn add --dev html-webpack-plugin preload-webpack-plugin

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const HtmlWebpackPlugin = require('html-webpack-plugin'); const PreloadWebpackPlugin = require('preload-webpack-plugin'); ./webpack.conﬁg.js

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plugins: [ new HtmlWebpackPlugin({ filename: 'index.html', template: './public/index.html', favicon: './public/favicon.ico' }), new PreloadWebpackPlugin({ include: ['vendor', 'main', 'common', 'home'] }), ] ./webpack.conﬁg.js

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./public/index.html

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plugins: [ new PreloadWebpackPlugin({ rel: 'prefetch', include: ['users', 'notification'] }), ] ./webpack.conﬁg.js

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More Optimization

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class LazySidebarDrawer extends React.Component { componentDidMount() { let frameCount = 0; const open = () => (frameCount ++ > 0) ? this.props.onMounted() : requestAnimationFrame(open); requestAnimationFrame(open); } render() { return ( ... ); } }