title: Workbox - Push and Push Notifications?
body: <p>Looking over the documentation for <a href="https://developers.google.com/web/tools/workbox/" rel="nofollow noreferrer">workbox.js</a>, I am not seeing any documentation for push or push notifications.</p>
  
  <p>Does workbox offer push functionality? I am speaking of the client side, not server side. Mainly subscriptions and invoking the notification api. </p>
  
  <p>And if not, how would I would need to write that service worker manually. How would I integrate a manual written service worker into a existing workbox implementation? </p>