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https://github.com/shadowwalker/next-pwa

Zero config PWA plugin for Next.js, with workbox 🧰
https://github.com/shadowwalker/next-pwa

cache nextjs pwa service-worker web webapp website workbox

Last synced: about 1 month ago
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Zero config PWA plugin for Next.js, with workbox 🧰

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README 

        
# Zero Config [PWA](https://web.dev/learn/pwa/) Plugin for [Next.js](https://nextjs.org/)



This plugin is powered by [workbox](https://developer.chrome.com/docs/workbox/) and other good stuff.



![size](https://img.shields.io/bundlephobia/minzip/next-pwa.svg) ![dependencies](https://img.shields.io/librariesio/release/npm/next-pwa) ![downloads](https://img.shields.io/npm/dw/next-pwa.svg) ![license](https://img.shields.io/npm/l/next-pwa.svg)



👋 Share your awesome PWA project 👉 [here](https://github.com/shadowwalker/next-pwa/discussions/206)



**Features**



- 0️⃣ Zero config for registering and generating service worker

- ✨ Optimized precache and runtime cache

- 💯 Maximize lighthouse score

- 🎈 Easy to understand examples

- 📴 Completely offline support with fallbacks [example](https://github.com/shadowwalker/next-pwa/tree/master/examples/offline-fallback-v2) 🆕

- 📦 Use [workbox](https://developer.chrome.com/docs/workbox/) and [workbox-window](https://developer.chrome.com/docs/workbox/modules/workbox-window) v6

- 🍪 Work with cookies out of the box

- 🔉 Default range requests for audios and videos

- ☕ No custom server needed for Next.js 9+ [example](https://github.com/shadowwalker/next-pwa/tree/master/examples/next-9)

- 🔧 Handle PWA lifecycle events opt-in [example](https://github.com/shadowwalker/next-pwa/tree/master/examples/lifecycle)

- 📐 Custom worker to run extra code with code splitting and **typescript** support [example](https://github.com/shadowwalker/next-pwa/tree/master/examples/custom-ts-worker)

- 📜 [Public environment variables](https://nextjs.org/docs/basic-features/environment-variables#exposing-environment-variables-to-the-browser) available in custom worker as usual

- 🐞 Debug service worker with confidence in development mode without caching

- 🌏 Internationalization (a.k.a I18N) with `next-i18next` [example](https://github.com/shadowwalker/next-pwa/tree/master/examples/next-i18next)

- 🛠 Configurable by the same [workbox configuration options](https://developer.chrome.com/docs/workbox/modules/workbox-webpack-plugin) for [GenerateSW](https://developer.chrome.com/docs/workbox/modules/workbox-webpack-plugin/#generatesw-plugin) and [InjectManifest](https://developer.chrome.com/docs/workbox/modules/workbox-webpack-plugin/#injectmanifest-plugin)

- 🚀 Spin up a [GitPod](https://gitpod.io/#https://github.com/shadowwalker/next-pwa/) and try out examples in rocket speed

- ⚡ Support [blitz.js](https://blitzjs.com/) (simply add to `blitz.config.js`)

- 🔩 (Experimental) precaching `.module.js` when `next.config.js` has `experimental.modern` set to `true`



> **NOTE 1** - `next-pwa` version 2.0.0+ should only work with `next.js` 9.1+, and static files should only be served through `public` directory. This will make things simpler.

>

> **NOTE 2** - If you encounter error `TypeError: Cannot read property **'javascript' of undefined**` during build, [please consider upgrade to webpack5 in `next.config.js`](https://github.com/shadowwalker/next-pwa/issues/198#issuecomment-817205700).



---



[![Open in Gitpod](https://img.shields.io/badge/Open%20In-Gitpod.io-%231966D2?style=for-the-badge&logo=gitpod)](https://gitpod.io/#https://github.com/shadowwalker/next-pwa/)



## Install



> If you are new to `next.js` or `react.js` at all, you may want to first checkout [learn next.js](https://nextjs.org/learn/basics/create-nextjs-app) or [next.js document](https://nextjs.org/docs/getting-started). Then start from [a simple example](https://github.com/shadowwalker/next-pwa/tree/master/examples/next-9) or [progressive-web-app example in next.js repository](https://github.com/vercel/next.js/tree/canary/examples/progressive-web-app).



```bash

yarn add next-pwa

```



## Basic Usage



### Step 1: withPWA



Update or create `next.config.js` with



```javascript

const withPWA = require('next-pwa')({

  dest: 'public'

})



module.exports = withPWA({

  // next.js config

})

```



After running `next build`, this will generate two files in your `public`: `workbox-*.js` and `sw.js`, which will automatically be served statically.



If you are using Next.js version 9 or newer, then skip the options below and move on to Step 2.



If you are using Next.js older than version 9, you'll need to pick an option below before continuing to Step 2.



### Option 1: Host Static Files



Copy files to your static file hosting server, so that they are accessible from the following paths: `https://yourdomain.com/sw.js` and `https://yourdomain.com/workbox-*.js`.



One example is using Firebase hosting service to host those files statically. You can automate the copy step using scripts in your deployment workflow.



> For security reasons, you must host these files directly from your domain. If the content is delivered using a redirect, the browser will refuse to run the service worker.



### Option 2: Use Custom Server



When an HTTP request is received, test if those files are requested, then return those static files.



Example `server.js`



```javascript

const { createServer } = require('http')

const { join } = require('path')

const { parse } = require('url')

const next = require('next')



const app = next({ dev: process.env.NODE_ENV !== 'production' })

const handle = app.getRequestHandler()



app.prepare().then(() => {

  createServer((req, res) => {

    const parsedUrl = parse(req.url, true)

    const { pathname } = parsedUrl



    if (pathname === '/sw.js' || /^\/(workbox|worker|fallback)-\w+\.js$/.test(pathname)) {

      const filePath = join(__dirname, '.next', pathname)

      app.serveStatic(req, res, filePath)

    } else {

      handle(req, res, parsedUrl)

    }

  }).listen(3000, () => {

    console.log(`> Ready on http://localhost:${3000}`)

  })

})

```



> The following setup has nothing to do with `next-pwa` plugin, and you probably have already set them up. If not, go ahead and set them up.



### Step 2: Add Manifest File (Example)



Create a `manifest.json` file in your `public` folder:



```json

{

  "name": "PWA App",

  "short_name": "App",

  "icons": [

    {

      "src": "/icons/android-chrome-192x192.png",

      "sizes": "192x192",

      "type": "image/png",

      "purpose": "any maskable"

    },

    {

      "src": "/icons/android-chrome-384x384.png",

      "sizes": "384x384",

      "type": "image/png"

    },

    {

      "src": "/icons/icon-512x512.png",

      "sizes": "512x512",

      "type": "image/png"

    }

  ],

  "theme_color": "#FFFFFF",

  "background_color": "#FFFFFF",

  "start_url": "/",

  "display": "standalone",

  "orientation": "portrait"

}

```



### Step 3: Add Head Meta (Example)



Add the following into `_document.jsx` or `_app.tsx`, in ``:



```html



```



> Tip: Put the `viewport` head meta tag into `_app.js` rather than in `_document.js` if you need it.



```typescript



```



## Offline Fallbacks



Offline fallbacks are useful when the fetch failed from both cache and network, a precached resource is served instead of present an error from browser.



To get started simply add a `/_offline` page such as `pages/_offline.js` or `pages/_offline.jsx` or `pages/_offline.ts` or `pages/_offline.tsx`. Then you are all set! When the user is offline, all pages which are not cached will fallback to '/\_offline'.



**[Use this example to see it in action](https://github.com/shadowwalker/next-pwa/tree/master/examples/offline-fallback-v2)**



`next-pwa` helps you precache those resources on the first load, then inject a fallback handler to `handlerDidError` plugin to all `runtimeCaching` configs, so that precached resources are served when fetch failed.



You can also setup `precacheFallback.fallbackURL` in your [runtimeCaching config entry](https://developer.chrome.com/docs/workbox/reference/workbox-build/#type-RuntimeCaching) to implement similar functionality. The difference is that above method is based on the resource type, this method is based matched url pattern. If this config is set in the runtimeCaching config entry, resource type based fallback will be disabled automatically for this particular url pattern to avoid conflict.



## Configuration



There are options you can use to customize the behavior of this plugin by adding `pwa` object in the next config in `next.config.js`:



```javascript

const withPWA = require('next-pwa')({

  dest: 'public'

  // disable: process.env.NODE_ENV === 'development',

  // register: true,

  // scope: '/app',

  // sw: 'service-worker.js',

  //...

})



module.exports = withPWA({

  // next.js config

})

```



### Available Options



- disable: boolean - whether to disable pwa feature as a whole

  - default: `false`

  - set `disable: false`, so that it will generate service worker in both `dev` and `prod`

  - set `disable: true` to completely disable PWA

  - if you don't need to debug service worker in `dev`, you can set `disable: process.env.NODE_ENV === 'development'`

- register: boolean - whether to let this plugin register service worker for you

  - default to `true`

  - set to `false` when you want to handle register service worker yourself, this could be done in `componentDidMount` of your root app. you can consider the [register.js](https://github.com/shadowwalker/next-pwa/blob/master/register.js) as an example.

- scope: string - url scope for pwa

  - default: [`basePath`](https://nextjs.org/docs/api-reference/next.config.js/basepath) in `next.config.js` or `/`

  - set to `/app` so that path under `/app` will be PWA while others are not

- sw: string - service worker script file name

  - default: `/sw.js`

  - set to another file name if you want to customize the output file name

- runtimeCaching - caching strategies (array or callback function)

  - default: see the **Runtime Caching** section for the default configuration

  - accepts an array of cache entry objects, [please follow the structure here](https://developer.chrome.com/docs/workbox/reference/workbox-build/#type-RuntimeCaching)

  - Note: the order of the array matters. The first rule that matches is effective. Therefore, please **ALWAYS** put rules with larger scope behind the rules with a smaller and specific scope.

- publicExcludes - an array of glob pattern strings to exclude files in the `public` folder from being precached.

  - default: `['!noprecache/**/*']` - this means that the default behavior will precache all the files inside your `public` folder but files inside `/public/noprecache` folder. You can simply put files inside that folder to not precache them without config this.

  - example: `['!img/super-large-image.jpg', '!fonts/not-used-fonts.otf']`

- buildExcludes - an array of extra pattern or function to exclude files from being precached in `.next/static` (or your custom build) folder

  - default: `[]`

  - example: `[/chunks\/images\/.*$/]` - Don't precache files under `.next/static/chunks/images` (Highly recommend this to work with `next-optimized-images` plugin)

  - doc: Array of (string, RegExp, or function()). One or more specifiers used to exclude assets from the precache manifest. This is interpreted following the same rules as Webpack's standard exclude option.

- cacheStartUrl - whether to cache start url

  - default: `true`

  - [discussion of use case to not cache start url at all](https://github.com/shadowwalker/next-pwa/pull/296#issuecomment-1094167025)

- dynamicStartUrl - if your start url returns different HTML document under different state (such as logged in vs. not logged in), this should be set to true.

  - default: `true`

  - effective when `cacheStartUrl` set to `true`

  - recommend: set to **false** if your start url always returns same HTML document, then start url will be precached, this will help to speed up first load.

- dynamicStartUrlRedirect - if your start url redirect to another route such as `/login`, it's recommended to setup this redirected url for the best user experience.

  - default: `undefined`

  - effective when `dynamicStartUrlRedirect` set to `true`

- fallbacks - config precached routes to fallback when both cache and network not available to serve resources.

  - **if you just need a offline fallback page, simply create a `/_offline` page such as `pages/_offline.js` and you are all set, no configuration necessary**

  - default: `object`

    - `fallbacks.document` - fallback route for document (page), default to `/_offline` if you created that page

    - `fallbacks.image` - fallback route for image, default to none

    - `fallbacks.audio` - fallback route for audio, default to none

    - `fallbacks.video` - fallback route for video, default to none

    - `fallbacks.font` - fallback route for font, default to none

- cacheOnFrontEndNav - enable additional route cache when navigate between pages with `next/link` on front end. Checkout this [example](https://github.com/shadowwalker/next-pwa/tree/master/examples/cache-on-front-end-nav) for some context about why this is implemented.

  - default: `false`

  - note: this improve user experience on special use cases but it also adds some overhead because additional network call, I suggest you consider this as a trade off.

- ~~subdomainPrefix: string - url prefix to allow hosting static files on a subdomain~~

  - ~~default: `""` - i.e. default with no prefix~~

  - ~~example: `/subdomain` if the app is hosted on `example.com/subdomain`~~

  - deprecated, use [basePath](https://nextjs.org/docs/api-reference/next.config.js/basepath) instead

- reloadOnOnline - changes the behaviour of the app when the device detects that it has gone back "online" and has a network connection. Indicate if the app should call `location.reload()` to refresh the app.

  - default: `true`

- customWorkerDir - customize the directory where `next-pwa` looks for a custom worker implementation to add to the service worker generated by workbox. For more information, check out the [custom worker example](https://github.com/shadowwalker/next-pwa/tree/master/examples/custom-ts-worker).

  - default: `worker`



### Other Options



`next-pwa` uses `workbox-webpack-plugin`, other options which could also be put in `pwa` object can be found [**ON THE DOCUMENTATION**](https://developer.chrome.com/docs/workbox/modules/workbox-webpack-plugin) for [GenerateSW](https://developer.chrome.com/docs/workbox/modules/workbox-webpack-plugin/#generatesw-plugin) and [InjectManifest](https://developer.chrome.com/docs/workbox/modules/workbox-webpack-plugin/#injectmanifest-plugin). If you specify `swSrc`, `InjectManifest` plugin will be used, otherwise `GenerateSW` will be used to generate service worker.



### Runtime Caching



`next-pwa` uses a default runtime [cache.js](https://github.com/shadowwalker/next-pwa/blob/master/cache.js)



There is a great chance you may want to customize your own runtime caching rules. Please feel free to copy the default `cache.js` file and customize the rules as you like. Don't forget to inject the configurations into your `pwa` config in `next.config.js`.



Here is the [document on how to write runtime caching configurations](https://developer.chrome.com/docs/workbox/reference/workbox-build/#type-RuntimeCaching), including background sync and broadcast update features and more!



## Tips



1. [Common UX pattern to ask user to reload when new service worker is installed](https://github.com/shadowwalker/next-pwa/blob/master/examples/lifecycle/pages/index.js#L26-L38)

2. Use a convention like `{command: 'doSomething', message: ''}` object when `postMessage` to service worker. So that on the listener, it could do multiple different tasks using `if...else...`.

3. When you are debugging service worker, constantly `clean application cache` to reduce some flaky errors.

4. If you are redirecting the user to another route, please note [workbox by default only cache response with 200 HTTP status](https://developer.chrome.com/docs/workbox/modules/workbox-cacheable-response#what_are_the_defaults), if you really want to cache redirected page for the route, you can specify it in `runtimeCaching` such as `options.cacheableResponse.statuses=[200,302]`.

5. When debugging issues, you may want to format your generated `sw.js` file to figure out what's really going on.

6. Force `next-pwa` to generate worker box production build by specify the option `mode: 'production'` in your `pwa` section of `next.config.js`. Though `next-pwa` automatically generate the worker box development build during development (by running `next`) and worker box production build during production (by running `next build` and `next start`). You may still want to force it to production build even during development of your web app for following reason:

   1. Reduce logging noise due to production build doesn't include logging.

   2. Improve performance a bit due to production build is optimized and minified.

7. If you just want to disable worker box logging while keeping development build during development, [simply put `self.__WB_DISABLE_DEV_LOGS = true` in your `worker/index.js` (create one if you don't have one)](https://github.com/shadowwalker/next-pwa/blob/c48ef110360d0138ad2dacd82ab96964e3da2daf/examples/custom-worker/worker/index.js#L6).

8. It is common developers have to use `userAgent` string to determine if users are using Safari/iOS/MacOS or some other platform, [ua-parser-js](https://www.npmjs.com/package/ua-parser-js) library is a good friend for that purpose.



## Reference



1. [Google Workbox](https://developer.chrome.com/docs/workbox/what-is-workbox/)

2. [ServiceWorker, MessageChannel, & postMessage](https://ponyfoo.com/articles/serviceworker-messagechannel-postmessage) by [Nicolás Bevacqua](https://ponyfoo.com/contributors/ponyfoo)

3. [The Service Worker Lifecycle](https://developers.google.com/web/fundamentals/primers/service-workers/lifecycle)

4. [6 Tips to make your iOS PWA feel like a native app](https://www.netguru.com/codestories/pwa-ios)

5. [Make Your PWA Available on Google Play Store](https://www.netguru.com/codestories/make-your-pwa-available-on-google-play-store)



## Fun PWA Projects



1. [Experience SAMSUNG on an iPhone - must open on an iPhone to start](https://itest.nz/)

2. [App Scope - like an app store for PWA](https://appsco.pe/)

3. [PWA Directory](https://pwa-directory.appspot.com/)

4. [PWA Builder - Alternative way to build awesome PWA](https://www.pwabuilder.com/)



## License



MIT