Unclear default code splitting in cra v2

Created by: slava-lu

Is this a bug report?

If very unclear documentation is a bug then yes.

A newly created and built app with Create react app v2 creates three js chucks by default. But there is not a single line in neither index.js nor in App.js that does code splitting according to this guide https://reactjs.org/docs/code-splitting.html

I could not find any info, not in release notes, nor anywhere else why there are three bundles now without any dynamic import statements, what is the point and benefits of having three bundles even for 120K app, and what to do if I want only one js but want to keep other features of cra v2.

There is a ticket to disable a code splitting (https://github.com/facebook/create-react-app/issues/5306) but could you please elaborate a bit why it there in the default app in the first place if neither line of code asks for that.