Select React bundle (ON patchAsyncStorage())

[vicb]

Open next relies on patchAsyncStorage() to select the React bundle to load.

We should implement the same functionality for the cloudflare adapter where we can not patch mod._resolveFilename

[IgorMinar]

Is this to support different version of React for pages vs app router parts of one app?

Off topic, but related: how common is it for people to use two versions of react in a Next.js app?

[vicb]

This should not be require on Next14+
See this comment from @conico974

[conico974]

The patch for selecting the react bundle is not on patchAsyncStorage but here https://github.com/opennextjs/opennextjs-aws/blob/8530f7c057235a2627575838f9b05bffdc5ffb66/packages/open-next/src/core/util.ts#L28-L29.
The patchAsyncStorage patch is to fix an issue with the fetch cache not working properly on ISR request opennextjs/opennextjs-aws#503 because of this line https://github.com/vercel/next.js/blob/704a24a7ed326ed2faa737942d19c504104f57df/packages/next/src/server/lib/patch-fetch.ts#L767.
The better fix for this would be to fix this line directly in the next bundled chunks or this vercel/next.js#72082 (i need to test this with the new use cache system ideally)

Is this to support different version of React for pages vs app router parts of one app?

Yes, app and page router could use 2 different version of react, and for next >13.4.13 and <13.5.1 we had to patch it ourselves per request because NextServer was expected to run on different instance depending on if you used page or app router. (In standalone it was running in separate jest worker)

Off topic, but related: how common is it for people to use two versions of react in a Next.js app?

Not very common, it's for people that uses both page and app router (and using different version). Now that react 19 is out i guess you could use the same version for both