How to Write a Service Worker

A PWA is going to be able to you can install it on your taskbar. You can treat it like a native app. There are seven different types of service workers, depending on what pages you want to cache and some pages you would never cache because the data just needs to be refreshed so frequently. So if it's a progressive web app, how is it caching the code? How does it know what to do if I'm in airplane mode? Well, that's going to be due to however you write your service worker.