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📶 next-offline

Use Workbox with Next.js and
easily enable offline functionality in your application!

$ npm install --save next-offline

$ yarn add next-offline

Create a next.config.js in your project

// next.config.js
const withOffline = require('next-offline')

module.exports = withOffline()

Then create a server.js, because we'll need to serve out service worker.

// server.js
const { createServer } = require('http')
const { join } = require('path')
const { parse } = require('url')
const next = require('next')

const app = next()
const handle = app.getRequestHandler()

app.prepare()
  .then(() => {
    createServer((req, res) => {
      const parsedUrl = parse(req.url, true)
      const { pathname } = parsedUrl

      if (pathname === '/service-worker.js') {
        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}`)
    })
  })

Optionally you can add your custom Next.js configuration as parameter

// next.config.js
const withOffline = require('next-offline')

module.exports = withOffline({
  webpack(config, options) {
    return config
  }
})

If you want to customize your generated service worker, define a workboxOpts object in your next.config.js and it will gets passed to workbox-webpack-plugin

By default next-offline has the following blanket runtime caching strategy. If you customize next-offline with workboxOpts, the default behaviour will not be passed into workbox-webpack-plugin

{ urlPattern: /^https?.*/, handler: 'networkFirst' } // default cache strategy

// next.config.js
const withOffline = require('next-offline')

module.exports = withOffline({
  workboxOpts: {
    runtimeCaching: [
      {
        urlPattern: /.png$/,
        handler: 'cacheFirst'
      },
      {
        urlPattern: /api/,
        handler: 'networkFirst',
        options: {
          cacheableResponse: {
            statuses: [0, 200],
            headers: {
              'x-test': 'true'
            }
          }
        }
      }
    ]
  }
})

By default next-offline will register a service worker with the script below, this is automatically added to your client side bundle once withOffline is invoked.

if ('serviceWorker' in navigator) {
  window.addEventListener('load', function () {
    navigator.serviceWorker.register('/service-worker.js').then(function (registration) {
      console.log('SW registered: ', registration)
    }).catch(function (registrationError) {
      console.log('SW registration failed: ', registrationError)
    })
  })
}

This behavior can be disabled by passing in dontAutoRegisterSw: true to top level config object.

By default next-offline will precache all the Next.js webpack emitted files and the user-defined static ones (inside /static) - essentially everything that is exported as well.

If you'd like to include some more or change the origin of your static files use the given workbox options:

workboxOpts: {
  globPatterns: ['app/static/**/*', 'any/other/fileglob/to/cache'],
  globDirectory: '.',
  modifyUrlPrefix: {
    'app': assetPrefix,
  },
  runtimeCaching: {...}
}

By default next-offline will add a no-op service worker in development. If you want to provide your own pass its filepath to devSwSrc option. This is particularly useful if you want to test web push notifications in development, for example.

// next.config.js
const withOffline = require('next-offline')

module.exports = withOffline({
  devSwSrc: '/path/to/my/dev/service-worker.js'
})

In [email protected] we've rewritten the export functionality to work in more cases, more reliably, with less code thanks to some of the additions in Next 7.0.0!

You can read more about exporting at Next.js docs but next offline should Just Work™️.

Questions? Feedback? Please let me know

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Copyright © 2017-present Jack Hanford, [email protected]

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.