by
Made On Mars
A full working demo is available here. It's not the exact same code since this repo has been simplified for the tutorial.
If you want the Push Notifications to work you will need to create a Google Firebase Project to get you server key and GCM sender id. You can follow the tutorial here : https://www.made-on-mars.com/blog/how-to-pwa#reengageable
git clone https://github.com/MadeOnMars/lovelovelove
cd lovelovelove
npm install --global gulp-cli
npm install
gulp
# The project is available at http://localhost:3000