I am new about react and I am following different tutorials trying to understand fundamentals. I'm using the v17 of react.
In those tutorials, I saw a file in the folder structure named serviceWorker.js that is used for making a progressive web app.
I generated my project with npx but in my folder structure, I can't find this file. Is it a bug? or is it something deprecated? or do I have to add it manually?
I ran into the same issue, I expected to find this in my index.js:
import * as serviceWorker from './serviceWorker';
serviceWorker.unregister();
I looked again at my index.js to see what create-react-app had configured and found:
import reportWebVitals from './reportWebVitals';
reportWebVitals();
This has replace serviceWorker in version 4 of CRA October 2020.
From CRA 4 you can either opt in by using cra-template-pwa or by creating your own src/service-worker.js file.
But seems you only need to do so if you want to opt-in for the offline/cache-first behavior. The rest of PWA of tools are included in CRA.
It is all explained in https://create-react-app.dev/docs/making-a-progressive-web-app
The way I solved it was by creating the project like this:
$npx create-react-app name-pwa --template cra-template-pwa
and in the file structure you will find the file service-worker.js and serviceWorkerRegistration.js
and now in your index.js just change unregister by register:
serviceWorkerRegistration.register();