Query work

packages/effect-fc/src/QueryClient.ts

@@ -1,4 +1,4 @@
-import { type DateTime, type Duration, Effect, Equal, Equivalence, Hash, HashMap, Pipeable, Predicate, type Scope, SubscriptionRef } from "effect"
+import { DateTime, Duration, Effect, Equal, Equivalence, Hash, HashMap, Pipeable, Predicate, type Scope, SubscriptionRef } from "effect"
 import type * as Query from "./Query.js"
 import type * as Result from "./Result.js"
 
@@ -105,3 +105,11 @@ implements Pipeable.Pipeable {
 }
 
 export const isQueryClientCacheEntry = (u: unknown): u is QueryClientCacheEntry => Predicate.hasProperty(u, QueryClientCacheEntryTypeId)
+
+export const isQueryClientCacheEntryStale = (
+    self: QueryClientCacheEntry,
+    staleTime: Duration.DurationInput,
+): Effect.Effect<boolean> => Effect.andThen(
+    DateTime.now,
+    now => Duration.lessThan(DateTime.distanceDuration(self.createdAt, now), staleTime),
+)