A simple react cache implementation
@matthamlin/simple-cache
A simple react-cache implementation that works for both Server Components and Client Components!
// For use on the client, or in client components during SSR
import { useCache } from '@matthamlin/simple-cache/client'
let cache = new Map()
interface Result {
something: boolean
}
function useFetch(endpoint) {
return useCache<Result>(cache, endpoint, () =>
fetch(endpoint).then((data) => data.json()),
)
}
Or with Server Components (experimental):
import { useCache } from '@matthamlin/simple-cache/server'
let cache = new Map()
interface Result {
something: boolean
}
function useData(endpoint) {
return useCache<Result>(cache, endpoint, () =>
fetch(endpoint).then((res) => res.json()),
)
}
useCache
Arguments:cache
- A cache, expects the same api as a Map
key
- A unique key (string) to index the cache bymiss
- A function that returns a promise to suspend (function)Note I haven't done extensive testing with this approach, but it could work!
The server
entrypoint also exports a serializeCache
function that takes in
the cache
and returns a stringified representation of the cache. It's up to
you to pass that data down to the client, one possible approach is a <script>
tag injected alongside the component that suspended on the server!
On the client, you can import deserializeCache
from the client
entrypoint
and pass that stringified representation to it to get back the cache
which you
can pass through to all useCache
calls.
As long as the keys are equivalent, this should allow you to avoid double fetching on the client.
Note This doesn't yet work for pending
useCache
calls, not that I'd expect the server to flush those to the client 🤔