PWA 적용하기

1. Install node modules

First, we have to install webpack modules to build PWA

yarn add --dev webpack-pwa-manifest workbox-webpack-plugin

2. Create manifest.json file

public/manifest.json

{
    "name": "react-webpack",
    "short_name": "react",
    "description": "react todo list app with pwa",
    "background_color": "#ffffff",
    "crossorigin": "use-credentials",
    "theme_color": "#eeeeee",
    "filename": "manifest.json"
}

3. Implement webpack options

webpack.config.js

...
const WebpackPwaManifest = require('webpack-pwa-manifest')
const { GenerateSW } = require('workbox-webpack-plugin')
const manifest = require('./public/manifest.json')

...

const pwaPlugin = new WebpackPwaManifest(manifest)

const workboxPlugin = new InjectManifest({
    swSrc: './src/sw.js',
    swDest: 'sw.js',
})
...

{
    ...
    plugins: [htmlPlugin, cssPlugin, pwaPlugin, workboxPlugin],
}

src/sw.js

workbox.core.skipWaiting()
workbox.core.clientsClaim()

workbox.routing.registerRoute(
    new RegExp('<https://jsonplaceholder.typicode.com>'),
    new workbox.strategies.StaleWhileRevalidate()
)

self.addEventListener('push', event => {
    const title = 'Get Started With Workbox'
    const options = {
        body: event.data.text(),
    }
    event.waitUntil(
        self.ServiceWorkerRegistration.showNotification(title, options)
    )
})

workbox.precaching.precacheAndRoute(self.__precacheManifest)

We’ve implemented manifest file and service worker settings.

4. Implement service worker

src/index.js

import React from 'react'
import ReactDOM from 'react-dom'
import Root from './components/Root'
import './styles/index.scss'

ReactDOM.render(<Root />, document.getElementById('root'))

if ('serviceWorker' in navigator) {
    window.addEventListener('load', () => {
        navigator.serviceWorker
            .register('/sw.js')
            .then(registration => {
                console.log('SW registered', registration)
                registration.pushManager.subscribe({ userVisibleOnly: true })
                Notification.requestPermission().then(p => {
                    console.log(p)
                })
            })
            .catch(e => {
                console.log('SW registration failed: ', e)
            })
    })
}

After you’ve implemented above index.js, you can see Service Worker is running on the developer settings panel (of browser). (Click the Application tab, and click Service Workers tab)

Also, if you are in offline mode, you can see offline web app is working properly after you refresh your browser!

That’s because we’ve added json placeholder url on runtTimeCaching option.

Finally, we can see push notifications are working.

You can test on Application tab’s Service Workers. (You can click push button.)