Tests: fix fetch mock typings for type-aware checks

src/memory/embeddings-voyage.test.ts

@@ -14,11 +14,12 @@ vi.mock("../agents/model-auth.js", () => ({
 }));
 
 const createFetchMock = () => {
-  const fetchMock = vi.fn(async () => ({
-    ok: true,
-    status: 200,
-    json: async () => ({ data: [{ embedding: [0.1, 0.2, 0.3] }] }),
-  }));
+  const fetchMock = vi.fn(async (_input: RequestInfo | URL, _init?: RequestInit) => {
+    return new Response(JSON.stringify({ data: [{ embedding: [0.1, 0.2, 0.3] }] }), {
+      status: 200,
+      headers: { "Content-Type": "application/json" },
+    });
+  });
   return withFetchPreconnect(fetchMock) as typeof fetch & typeof fetchMock;
 };
 
@@ -94,13 +95,17 @@ describe("voyage embedding provider", () => {
 
   it("passes input_type=document for embedBatch", async () => {
     const fetchMock = withFetchPreconnect(
-      vi.fn(async () => ({
-        ok: true,
-        status: 200,
-        json: async () => ({
-          data: [{ embedding: [0.1, 0.2] }, { embedding: [0.3, 0.4] }],
-        }),
-      })),
+      vi.fn(async (_input: RequestInfo | URL, _init?: RequestInit) => {
+        return new Response(
+          JSON.stringify({
+            data: [{ embedding: [0.1, 0.2] }, { embedding: [0.3, 0.4] }],
+          }),
+          {
+            status: 200,
+            headers: { "Content-Type": "application/json" },
+          },
+        );
+      }),
     );
     vi.stubGlobal("fetch", fetchMock);
 

src/test-utils/fetch-mock.ts

@@ -1,6 +1,13 @@
-export const withFetchPreconnect = <T extends (...args: unknown[]) => unknown>(
+type FetchWithPreconnect = {
+  preconnect: (url: string, init?: { credentials?: RequestCredentials }) => void;
+};
+
+export function withFetchPreconnect<T extends typeof fetch>(fn: T): T & FetchWithPreconnect;
+export function withFetchPreconnect<T extends object>(
   fn: T,
-): typeof fetch =>
-  Object.assign(fn, {
-    preconnect: () => {},
-  }) as unknown as typeof fetch;
+): T & FetchWithPreconnect & typeof fetch;
+export function withFetchPreconnect(fn: object) {
+  return Object.assign(fn, {
+    preconnect: (_url: string, _init?: { credentials?: RequestCredentials }) => {},
+  });
+}