Docs: Docs claim that React memoizes fetch results, which I don't see any React docs to support that claim

[tehandyb]

What is the documentation issue?

https://nextjs.org/docs/13/app/building-your-application/caching
Here the documentation claims that React memoizes the response from the fetch function by extending it. I don't see any React documentation to support that

Is there any context that might help us understand?

I doubt react would extend the fetch function, and have not seen docs to support that

Does the docs page already exist? Please link to it.

https://nextjs.org/docs/13/app/building-your-application/caching

[samcx]

@tehandyb This is still true (maybe de-duped is the better term here?). It makes sense in App Router, where composability goes down to the component instead of a page, which was the case with Page Router. With the possibly of there being more components using the same fetch, it makes sense to automatically memoize on each React render.

I'm not exactly sure where this is located in the React code, but I believe it is in there.

[icyJoseph]

I don't know the current timeline, but this was merged some time ago to React:

• Remove automatic fetch cache instrumentation facebook/react#28896

However, Next.js did/has some home-made version?

next.js/packages/next/src/server/lib/incremental-cache/index.ts

Line 268 in b5666ce

// x-ref: https://github.com/facebook/react/blob/2655c9354d8e1c54ba888444220f63e836925caa/packages/react/src/ReactFetch.js#L23