Service workers are meant to run on production builds over https. But we want to test on localhost. Below some possible troubleshooting.
This post assumes you have already ran:
ng add @angular/pwa --project *project-name*
A few steps are required to getting your service worker installed on your localhost.
ngsw-worker.js not found
Firstly, make sure in your angular.json file the following is present: "ServiceWorker": true
"configurations": {
"production": {
"serviceWorker": true,
"fileReplacements":
...
Second, install http-server and run
http-server -p 8080 -c-1 dist/app
Third, your service workers might not work on ip-addresses. Therefore, you should used the following instead:
http://localhost:8080/
Go to DevTools > applications > Service workers to see if your ngsw-worker is found correctly.