Use Match for config operations

ts/EFFECT_NATIVE_REWRITE_AUDIT.md

@@ -346,6 +346,25 @@ Notes:
   - `git diff --check`
   - `git diff --check`
 
+### 2026-06-02: ConfigService Operation Match Slice
+
+- Status: migrated and package-verified.
+- Completed:
+  - `ts/packages/flow/src/config/service.ts` now dispatches
+    `ConfigOperation` with `effect/Match` instead of a native `switch`.
+  - The dispatcher is a named `Effect.fn` and uses `Match.exhaustive` against
+    the schema-derived `ConfigOperation` union.
+  - The per-message response sender now uses `Effect.fnUntraced` instead of an
+    arrow function returning `Effect.gen(...)`.
+  - Config-service tests now cover all seven operations through
+    `handleOperation`, including tagged invalid mutation failures.
+  - Existing explicit `never` annotations on `persistEffect`,
+    `loadFromDiskEffect`, `persistStateEffect`, and
+    `readPersistedConfigEffect` were removed so Effect can infer the channel.
+- Verification:
+  - `bun run --cwd ts/packages/flow test -- src/__tests__/config-service.test.ts`
+  - `cd ts && bun run check:tsgo`
+
 ### 2026-06-02: RAG And Agent Requestor Bridge Slice
 
 - Status: migrated, root-verified, committed, and pushed.
@@ -1792,8 +1811,8 @@ Notes:
   - FlowManager `() => Effect.gen(...)` factories are normalized to
     `Effect.fn` / `Effect.fnUntraced`. Sibling service factories still need a
     focused scan before treating them as valid migration targets.
-  - KnowledgeCore operation dispatch now uses `effect/Match` with
-    `Match.exhaustive`; remaining service operation switches are in config and
+  - ConfigService and KnowledgeCore operation dispatch now use `effect/Match`
+    with `Match.exhaustive`; remaining service operation switches are in
     librarian surfaces.
   - Long-lived `Map` / `Set` state in ref-backed services can move toward
     Effect collections later; local pure traversal maps/sets remain no-ops.

ts/packages/flow/src/__tests__/config-service.test.ts

@@ -147,6 +147,58 @@ describe("ConfigService operations", () => {
     ]);
   });
 
+  it("dispatches all config operations through the Match-backed handler", async () => {
+    const service = makeService();
+
+    await expect(service.handleOperation({ operation: "put" })).rejects.toMatchObject({
+      _tag: "ConfigServiceError",
+      operation: "put",
+    });
+    await expect(service.handleOperation({ operation: "delete" })).rejects.toMatchObject({
+      _tag: "ConfigServiceError",
+      operation: "delete",
+    });
+
+    await expect(service.handleOperation({
+      operation: "put",
+      values: [{ type: "prompt", key: "system", value: "hello" }],
+    })).resolves.toEqual({ version: 1 });
+
+    await expect(service.handleOperation({
+      operation: "get",
+      keys: ["prompt", "system"],
+    })).resolves.toEqual({
+      version: 1,
+      values: { system: "hello" },
+    });
+    await expect(service.handleOperation({ operation: "list" })).resolves.toEqual({
+      version: 1,
+      directory: ["prompt"],
+    });
+    await expect(service.handleOperation({ operation: "config" })).resolves.toEqual({
+      version: 1,
+      config: { prompt: { system: "hello" } },
+    });
+    await expect(service.handleOperation({
+      operation: "getvalues",
+      type: "prompt",
+    })).resolves.toEqual({
+      version: 1,
+      values: [{ type: "prompt", key: "system", value: "hello" }],
+    });
+    await expect(service.handleOperation({
+      operation: "getvalues-all-ws",
+      type: "prompt",
+    })).resolves.toEqual({
+      version: 1,
+      values: [{ workspace: "default", type: "prompt", key: "system", value: "hello" }],
+    });
+    await expect(service.handleOperation({
+      operation: "delete",
+      keys: ["prompt", "system"],
+    })).resolves.toEqual({ version: 2 });
+  });
+
   it("pushes config from the stored producer handle", async () => {
     const backend = new NoopPubSub();
     const service = makeConfigService({

ts/packages/flow/src/config/service.ts

@@ -5,7 +5,7 @@
  */
 
 import {NodeRuntime} from "@effect/platform-node";
-import {Duration, Effect, Layer, ManagedRuntime, SynchronizedRef} from "effect";
+import {Duration, Effect, Layer, ManagedRuntime, Match, SynchronizedRef} from "effect";
 import * as Predicate from "effect/Predicate";
 import * as S from "effect/Schema";
 import {
@@ -109,9 +109,9 @@ export interface ConfigService extends AsyncProcessorRuntime<ConfigServiceError>
   readonly pushConfig: () => Promise<void>;
   readonly pushConfigEffect: Effect.Effect<void, ConfigServiceError>;
   readonly persist: () => Promise<void>;
-  readonly persistEffect: Effect.Effect<void, never>;
+  readonly persistEffect: Effect.Effect<void>;
   readonly loadFromDisk: () => Promise<void>;
-  readonly loadFromDiskEffect: Effect.Effect<void, never>;
+  readonly loadFromDiskEffect: Effect.Effect<void>;
 }
 
 const initialState = (): ConfigServiceState => ({
@@ -340,7 +340,7 @@ const updateHandles = (
 const persistStateEffect = (
   persistPath: string | null,
   state: ConfigServiceState,
-): Effect.Effect<void, never> =>
+): Effect.Effect<void> =>
   Effect.gen(function* () {
     if (persistPath === null) return;
     const payload = {
@@ -383,7 +383,7 @@ const pushConfigWithStateEffect = (
 
 const readPersistedConfigEffect = (
   persistPath: string,
-): Effect.Effect<PersistedConfig | null, never> =>
+): Effect.Effect<PersistedConfig | null> =>
   Effect.gen(function* () {
     const raw = yield* Effect.tryPromise({
       try: () => readTextFile(persistPath),
@@ -778,26 +778,24 @@ export function makeConfigService(config: ConfigServiceConfig): ConfigService {
   const baseStop = base.stop;
   const persistPath = config.persistPath ?? null;
 
-  const handleOperationEffect = (request: ConfigRequest) => {
+  const handleOperationEffect = Effect.fn("ConfigService.handleOperation")(function* (
+    request: ConfigRequest,
+  ) {
     const op: ConfigOperation = request.operation;
 
-    switch (op) {
-      case "get":
-        return Effect.succeed(handleGetWithState(stateSnapshot(state), request));
-      case "put":
-        return handlePutEffect(state, persistPath, request);
-      case "delete":
-        return handleDeleteEffect(state, persistPath, request);
-      case "list":
-        return Effect.succeed(handleListWithState(stateSnapshot(state), request));
-      case "config":
-        return Effect.succeed(handleConfigDumpWithState(stateSnapshot(state), request));
-      case "getvalues":
-        return Effect.succeed(handleGetValuesWithState(stateSnapshot(state), request));
-      case "getvalues-all-ws":
-        return Effect.succeed(handleGetValuesAllWorkspacesWithState(stateSnapshot(state), request));
-    }
-  };
+    return yield* Match.value(op).pipe(
+      Match.when("get", () => Effect.succeed(handleGetWithState(stateSnapshot(state), request))),
+      Match.when("put", () => handlePutEffect(state, persistPath, request)),
+      Match.when("delete", () => handleDeleteEffect(state, persistPath, request)),
+      Match.when("list", () => Effect.succeed(handleListWithState(stateSnapshot(state), request))),
+      Match.when("config", () => Effect.succeed(handleConfigDumpWithState(stateSnapshot(state), request))),
+      Match.when("getvalues", () => Effect.succeed(handleGetValuesWithState(stateSnapshot(state), request))),
+      Match.when("getvalues-all-ws", () =>
+        Effect.succeed(handleGetValuesAllWorkspacesWithState(stateSnapshot(state), request))
+      ),
+      Match.exhaustive,
+    );
+  });
 
   const handleMessageEffect = Effect.fn("handleMessageEffect")(function* (msg: Message<ConfigRequest>) {
       const request = yield* S.decodeUnknownEffect(ConfigRequestSchema)(msg.value()).pipe(
@@ -810,17 +808,16 @@ export function makeConfigService(config: ConfigServiceConfig): ConfigService {
         return;
       }
 
-      const sendResponse = (response: ConfigResponse): Effect.Effect<void, ConfigServiceError> =>
-        Effect.gen(function* () {
-          const responseProducer = (yield* SynchronizedRef.get(state)).responseProducer;
-          if (responseProducer === null) {
-            return yield* configServiceError("respond", "Config response producer not started");
-          }
-          yield* Effect.tryPromise({
-            try: () => responseProducer.send(response, {id: requestId}),
-            catch: (cause) => configServiceError("respond", cause),
-          });
+      const sendResponse = Effect.fnUntraced(function* (response: ConfigResponse) {
+        const responseProducer = (yield* SynchronizedRef.get(state)).responseProducer;
+        if (responseProducer === null) {
+          return yield* configServiceError("respond", "Config response producer not started");
+        }
+        yield* Effect.tryPromise({
+          try: () => responseProducer.send(response, {id: requestId}),
+          catch: (cause) => configServiceError("respond", cause),
         });
+      });
 
       yield* handleOperationEffect(request).pipe(
         Effect.flatMap(sendResponse),