VERY IMPORTANT: This utility is currently in an experimental stage. This means that breaking changes will happen in minor AND patch releases. Use at your own risk. If you choose to rely on this in production in an experimental stage, please lock your version to a patch-level version to avoid unexpected breakages.
persistQueryClient is a utility for persisting the state of your queryClient and its caches for later use. Different persistors can be used to store your client and cache to many different storage layers.
This utility comes packaged with
svelte-query and is available under the
persistQueryClient function, and pass it your
QueryClient instance (with a
cacheTime set), and a Persistor interface (there are multiple persistor types you can use):
IMPORTANT - for persist to work properly, you need to pass
cacheTime value to override the default during hydration (as shown above).
If it is not set when creating the
QueryClient instance, it will default to
300000 (5 minutes) for hydration, and the stored cache will be discarded after 5 minutes of inactivity. This is the default garbage collection behavior.
It should be set as the same value or higher than persistQueryClient's
maxAge option. E.g. if
maxAge is 24 hours (the default) then
cacheTime should be 24 hours or higher. If lower than
maxAge, garbage collection will kick in and discard the stored cache earlier than expected.
You can also pass it
Infinity to disable garbage collection behavior entirely.
As you use your application:
When you reload/bootstrap your app:
maxAge(which by default is 24 hours), it will be discarded. This can be customized as you see fit.
Sometimes you may make changes to your application or data that immediately invalidate any and all cached data. If and when this happens, you can pass a
buster string option to
persistQueryClient, and if the cache that is found does not also have that buster string, it will be discarded.
Pass this function a
QueryClient instance and a persistor that will persist your cache. Both are required
An object of options:
The default options are:
Persistors have the following interface:
Persisted Client entries have the following interface:
Satisfy all of these interfaces and you've got yourself a persistor!