Fix

packages/extension-query/src/FailureHandler.ts

@@ -0,0 +1,20 @@
+import { type Context, Effect, Layer, Queue, Stream } from "effect"
+
+
+export interface FailureHandler<E> {
+    readonly failures: Stream.Stream<E>
+    readonly queue: Queue.Queue<E>
+}
+
+export const Tag = <const Id extends string>(id: Id) => <
+    Self, E = never,
+>() => Effect.Tag(id)<Self, FailureHandler<E>>()
+
+export const layer = <Self, Id extends string, E>(
+    tag: Context.TagClass<Self, Id, FailureHandler<E>>
+): Layer.Layer<Self> => Layer.effect(tag, Queue.unbounded<E>().pipe(
+    Effect.map(queue => ({
+        failures: Stream.fromQueue(queue),
+        queue,
+    }))
+))

packages/extension-query/src/QueryExtension.ts

@@ -6,6 +6,13 @@ import * as QueryRunner from "./QueryRunner.js"
 import type * as QueryService from "./QueryService.js"
 
 
+export interface QueryExtension<HandlerE> {
+    useQuery<K extends readonly unknown[], A, E, R>(
+        this: ReffuseHelpers.ReffuseHelpers<R>,
+        props: UseQueryProps<K, A, E, R>,
+    ): UseQueryResult<K, A, Exclude<E, HandlerE>>
+}
+
 export interface UseQueryProps<K extends readonly unknown[], A, E, R> {
     readonly key: Stream.Stream<K>
     readonly query: (key: K) => Effect.Effect<A, E, R>

packages/extension-query/src/QueryRunner.ts

@@ -54,22 +54,23 @@ export const make = <K extends readonly unknown[], A, E, R>(
         }))
     )
 
-    const forkFetch = interrupt.pipe(
-        Effect.andThen(
-            Ref.set(stateRef, AsyncData.loading()).pipe(
-                Effect.andThen(latestKeyRef),
-                Effect.flatMap(identity),
-                Effect.flatMap(key => query(key).pipe(
-                    Effect.matchCauseEffect({
-                        onSuccess: v => Ref.set(stateRef, AsyncData.success(v)),
-                        onFailure: c => Ref.set(stateRef, AsyncData.failure(c)),
-                    })
-                )),
+    const run = latestKeyRef.pipe(
+        Effect.flatMap(identity),
+        Effect.flatMap(key => query(key).pipe(
+            Effect.matchCauseEffect({
+                onSuccess: v => Ref.set(stateRef, AsyncData.success(v)),
+                onFailure: c => Ref.set(stateRef, AsyncData.failure(c)),
+            })
+        )),
 
-                Effect.provide(context),
-                Effect.fork,
-            )
-        ),
+        Effect.provide(context),
+    )
+
+    const forkFetch = interrupt.pipe(
+        Effect.andThen(Ref.set(stateRef, AsyncData.loading()).pipe(
+            Effect.andThen(run),
+            Effect.fork,
+        )),
 
         Effect.flatMap(fiber =>
             Ref.set(fiberRef, Option.some(fiber)).pipe(
@@ -82,27 +83,16 @@ export const make = <K extends readonly unknown[], A, E, R>(
     )
 
     const forkRefresh = interrupt.pipe(
-        Effect.andThen(
-            Ref.update(stateRef, previous => {
-                if (AsyncData.isSuccess(previous) || AsyncData.isFailure(previous))
-                    return AsyncData.refreshing(previous)
-                if (AsyncData.isRefreshing(previous))
-                    return AsyncData.refreshing(previous.previous)
-                return AsyncData.loading()
-            }).pipe(
-                Effect.andThen(latestKeyRef),
-                Effect.flatMap(identity),
-                Effect.flatMap(key => query(key).pipe(
-                    Effect.matchCauseEffect({
-                        onSuccess: v => Ref.set(stateRef, AsyncData.success(v)),
-                        onFailure: c => Ref.set(stateRef, AsyncData.failure(c)),
-                    })
-                )),
-
-                Effect.provide(context),
-                Effect.fork,
-            )
-        ),
+        Effect.andThen(Ref.update(stateRef, previous => {
+            if (AsyncData.isSuccess(previous) || AsyncData.isFailure(previous))
+                return AsyncData.refreshing(previous)
+            if (AsyncData.isRefreshing(previous))
+                return AsyncData.refreshing(previous.previous)
+            return AsyncData.loading()
+        }).pipe(
+            Effect.andThen(run),
+            Effect.fork,
+        )),
 
         Effect.flatMap(fiber =>
             Ref.set(fiberRef, Option.some(fiber)).pipe(