saber-plugin-pwa

Add PWA (progressive web app) support to your Saber app.

Install

yarn add saber-plugin-pwa

Usage

In your saber-config.yml:

plugins:
  - resolve: saber-plugin-pwa

Then you need to create a set of icons in static folder to make your app installable, for example:

• img/icons/icon_128x128.png
• img/icons/icon_256x256.png
• img/icons/icon_512x512.png

And create static/manifest.json to include these icons:

{
  "icons": [
    {
      "src": "img/icons/icon_128x128.png",
      "type": "image/png",
      "sizes": "128x128"
    },
    {
      "src": "img/icons/icon_256x256.png",
      "type": "image/png",
      "sizes": "256x256"
    },
    {
      "src": "img/icons/icon_512x512.png",
      "type": "image/png",
      "sizes": "512x512"
    }
  ]
}

You don't need to worry about other options in manifest.json, this plugin will set default values for them.

Now run saber build and you will get a PWA-ready web app in public folder.

Configure the Text for the Update Notifier

Use siteConfig in your Saber config file to configure the text:

siteConfig:
  # Default values:
  pwaFirstTimeInstallMessage: Ready for offline use
  pwaUpdateFoundMessage: Downloading app updates in the background..
  pwaUpdateReadyMessage: A new version of this app is available
  pwaUpdateButtonMessage: UPDATE
  pwaDismissMessage: DISMISS

Remove Service Worker

If you no longer need this plugin in your website, you should first uninstall this plugin and remove it from your saber-config.yml:

plugins:
-  - resolve: saber-plugin-pwa

Then populate a static/service-worker.js file as follows:

self.addEventListener('install', function(e) {
  self.skipWaiting()
})

self.addEventListener('activate', function(e) {
  self.registration
    .unregister()
    .then(function() {
      return self.clients.matchAll()
    })
    .then(function(clients) {
      clients.forEach(client => client.navigate(client.url))
    })
})

The snippet tells your browser to remove previsously installed service worker and refresh.

Options

name

• Type: string
• Default: siteConfig.title | 'Saber PWA App'

The name for your PWA. You can also directly configure the name in your manifest.json to override this.

themeColor

• Type: string
• Default: #ffffff

The theme color for your PWA. You can also directly configure the theme_color in your manifest.json to override this.

assetsVersion

• Type: string
• Default: ''

This option is used if you need to add a version to your manifest.json, against browser’s cache. This will append ?v=assetsVersion to the URL of the manifest.

appleTouchIcon

• Type: string

The URL to the apple touch icon, for example img/icons/apple-touch-icon-152x152.png, used by iOS devices. When this is not set we automatically use icons from your manifest.json.

notifyUpdates

• Type: boolean
• Default: true

Pop up an update notifier when a new update for your app if available.

You can disable this with notifyUpdates: false and use your custom update notifier in saber-browser.js:

// `workbox` is injected by this plugin
export default ({ workbox }) => {
  if (process.browser && workbox) {
    workbox.addEventListener('installed', event => {
      if (!event.isUpdate) {
        showUpdateNotifier({
          message: 'Ready for offline use'
        })
      }
    })

    workbox.addEventListener('waiting', () => {
      showUpdateNotifier({
        message: 'An update is ready, click to apply',
        clicked() {
          workbox.addEventListener('controlling', event => {
            window.location.reload()
          })

          workbox.messageSW({ type: 'SKIP_WAITING' })
        }
      })
    })
  }
}

Then just implement your own showUpdateNotifier function. Check out workbox-window for the details of the workbox object.

generateSWOptions

• Type: object

Options for the generateSW API from workbox-build.

License

MIT.