title: How to update the cache in the background?
body: <p>I'm starting in the PWA world with the workbox. I currently use the <a href="https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-plugin-pwa" rel="nofollow noreferrer">vue-cli 3 tamplate for pwa</a>, which uses the workbox.</p>
  
  <p>I configured all offline access:</p>
  
  <pre><code>pwa: {
    workboxPluginMode: 'GenerateSW',
    workboxOptions: {
      skipWaiting: true
    }
  }
  </code></pre>
  
  <p>The only possibility of updating my cache is when I enter the site, the generated SW checks if there is an update and if it exists, it is enabled so that the next reload is activated.</p>
  
  <p>But is there a possibility to do this in the background? When I send a push, ask the cache to be updated? Can anyone give any hints how can I do this?</p>