Gradual Updates with React 16

[Yury Lavrukhin]

Here's the quote from the blog post https://reactjs.org/blog/2020/08/10/react-v17-rc.html

Thanks to this change, it is now safer to embed a React tree managed by one version inside a tree managed by a different React version. Note that for this to work, both of the versions would need to be 17 or higher, which is why upgrading to React 17 is important.

Note that for this to work, both of the versions would need to be 17 or higher

But this repository uses React 16 inside React 17, could it possibly create bugs with events?

[dan]

Yes, this is correct — we’re using 16 and 17 here to demonstrate that different versions work side by side, but ideally you’d use this in the future (e.g. 17 and 18) where both versions are 17+.