Cache busting with CRA React

Question

When I updated my site, run npm run build and upload the new files to the server I am still looking the old version of my site.

Without React, I can see the new ver

Answer 1

It appears that they changed from opt-out to opt-in with regards to the service worker. Here's the commit that changed the README and it has examples similar to Kerry G's answer:

https://github.com/facebook/create-react-app/commit/1b2813144b3b0e731d8f404a8169e6fa5916dde4#diff-4e6ec56f74ee42069aac401a4fe448ad