keepUnusedDataFor vs refetchOnMountOrArgChange

[viniciusbsneto]

I've already read RTK Query documentation but there's something I still don't understand quite well. Considering equal cache validation times for both props, what is the practical difference between keepUnusedDataFor and refetchOnMountOrArgChange (time in seconds)? Aren't they both going to refetch data after validation time?

[phryneas]

keepUnusedDataFor: Imagine you unmount your last component using useMyQuery(5). After keepUnusedDataFor seconds, the cache value will now be deleted from cache.

refetchOnMountOrArgChange: Imagine you already have a component using useMyQuery(5). Now a new component mounts and also uses useMyQuery(5). Normally, that data would not refetch. If refetchOnMountOrArgChange is set and more time than that value has passed when that new component mounts, it will re-fetch even though a result is already in the cache.

[viniciusbsneto]

Thank you! I think I have it clearer now.