🤖 Powerful asynchronous state management, server-state utilities and data fetching for the web. TS/JS, React Query, Solid Query, Svelte Query and Vue Query.
`find` is a slightly more advanced synchronous method that can be used to get an existing query instance from the cache. This instance not only contains **all** the state for the query, but all of the instances, and underlying guts of the query as well. If the query does not exist, `undefined` will be returned.
> Note: This is not typically needed for most applications, but can come in handy when needing more information about a query in rare scenarios (eg. Looking at the query.state.dataUpdatedAt timestamp to decide whether a query is fresh enough to be used as an initial value)
`findAll` is even more advanced synchronous method that can be used to get existing query instances from the cache that partially match query key. If queries do not exist, empty array will be returned.
> Note: This is not typically needed for most applications, but can come in handy when needing more information about a query in rare scenarios
The `subscribe` method can be used to subscribe to the query cache as a whole and be informed of safe/known updates to the cache like query states changing or queries being updated, added or removed
- This function will be called with the query cache any time it is updated via its tracked update mechanisms (eg, `query.setState`, `queryClient.removeQueries`, etc). Out of scope mutations to the cache are not encouraged and will not fire subscription callbacks
**Returns**
-`unsubscribe: Function => void`
- This function will unsubscribe the callback from the query cache.
## `queryCache.clear`
The `clear` method can be used to clear the cache entirely and start fresh.
To get a better understanding how the QueryCache works internally, have a look at [the Inside React Query article by TkDodo](https://tkdodo.eu/blog/inside-react-query).
