Does react 18 `cache()` cache across requests?

title, if I have a function wrapped with cache, does it cache across requests? or just dedupes calls in the same request

https://nextjs.org/docs/app/building-your-application/data-fetching/caching#react-cache

Data Fetching: Caching

Learn about caching routes in Next.js.

Jjepcd title, if I have a function wrapped with cache, does it cache across requests? o...

whatplan•7/7/23, 3:13 PM

current, cache only dedupes calls in the same request
a

fetch

fetch

-like cachecache is coming at some point
I actually made a tweet about this (look at julius' replies to the second one in the thread)
https://twitter.com/ethanniser/status/1676443763760144384?s=20

whatplan (@ethanniser)

its disappointing that granular caching is restricted to 'fetch' in @nextjs 13

being able to invalidate the exact points of data fetching that have changed is the coolest part of app router..

until you use your db client to query some data (the whole point of server components)

Twitter

•

7/5/23, 4:11 AM

Wwhatplan current, cache only dedupes calls in the same request a `fetch`-like `cache` is ...

jepcdOP•7/7/23, 7:35 PM

I'm not sure which way would be better, my use case currently is with next-auth in RSCs,

I'm using getServerSessiongetServerSession in a lot of server components, and without the cache it makes 2 db queries each time I use it

This is what I have now, which works well

export const getCurrentSession = cache(async (): Promise<Session | null> => {
  return await getServerSession(authOptions);
});

export const getCurrentSession = cache(async (): Promise<Session | null> => {
  return await getServerSession(authOptions);
});

Jjepcd I'm not sure which way would be better, my use case currently is with next-auth ...

whatplan•7/7/23, 7:46 PM

Your usage looks correct, the idea with cache is not having to fetch once and pass down props everywhere, instead just get the data in the component itself and let the framework dedupe

The new cache stuff is only about caching data between requests and granularity invalidating it, which probably wouldn’t be that useful for authentication which you want to check on every request

Does react 18 `cache()` cache across requests?

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