Jammming Project - differences in react template files

I’m just starting out the Jammming capstone project and after creating a template using create-react-app, I noticed that there are some differences between the template I have and what the video illustrated.

There may be more differences, but so far, I noticed there is no serviceworker.js file – instead there is a reportWebVitals.js file.

Could someone elaborate on the implications of this?