src/shared/api/authenticated-query.test.tsx

@@ -6,10 +6,7 @@ import { createQueryWrapper } from "@/test/query";
 import { resource } from "@/test/resource";
 import { server } from "@/test/server";
 
-import {
-	useAuthenticatedQueries,
-	useAuthenticatedQuery,
-} from "./authenticated-query";
+import { useAuthenticatedQuery } from "./authenticated-query";
 import { apiQueryClient, configureAuthClient } from "./client";
 
 const useSingleQuery = () =>
@@ -17,58 +14,49 @@ const useSingleQuery = () =>
 		apiQueryClient.queryOptions("get", "/api/v1/brokerage-accounts"),
 	);
 
-const useMultipleQueries = () =>
-	useAuthenticatedQueries([
-		apiQueryClient.queryOptions("get", "/api/v1/brokerage-accounts"),
-	])[0];
-
 describe("useAuthenticatedQuery", () => {
-	it.each(["single", "multiple"])(
-		"keeps %s protected queries idle without a session and loads after session configuration",
-		async (mode) => {
-			const requests = vi.fn();
-			server.use(
-				http.get("*/api/v1/brokerage-accounts", () => {
-					requests();
+	it("keeps protected queries idle without a session and loads after session configuration", async () => {
+		const requests = vi.fn();
+		server.use(
+			http.get("*/api/v1/brokerage-accounts", () => {
+				requests();
 
-					return HttpResponse.json(
-						resource([
-							{
-								id: "account-1",
-								name: "Основной",
-								openedOn: "2024-08-13",
-								type: "BROKERAGE",
-							},
-						]),
-					);
-				}),
-			);
+				return HttpResponse.json(
+					resource([
+						{
+							id: "account-1",
+							name: "Основной",
+							openedOn: "2024-08-13",
+							type: "BROKERAGE",
+						},
+					]),
+				);
+			}),
+		);
 
-			const { result } = renderHook(
-				mode === "single" ? useSingleQuery : useMultipleQueries,
-				{ wrapper: createQueryWrapper().wrapper },
-			);
+		const { result } = renderHook(useSingleQuery, {
+			wrapper: createQueryWrapper().wrapper,
+		});
 
-			await new Promise(resolve => setTimeout(resolve, 0));
-			expect(requests).not.toHaveBeenCalled();
-			expect(result.current?.fetchStatus).toBe("idle");
+		await new Promise(resolve => setTimeout(resolve, 0));
+		expect(requests).not.toHaveBeenCalled();
+		expect(result.current?.fetchStatus).toBe("idle");
 
-			configureAuthClient({
-				accessToken: () => "token",
-				clear: vi.fn(),
-				refresh: () => Promise.resolve(true),
-			});
+		configureAuthClient({
+			accessToken: () => "token",
+			clear: vi.fn(),
+			refresh: () => Promise.resolve(true),
+		});
 
-			await waitFor(() => expect(result.current?.isSuccess).toBe(true));
-			expect(requests).toHaveBeenCalledOnce();
-			expect(result.current?.data?.data).toEqual([
-				{
-					id: "account-1",
-					name: "Основной",
-					openedOn: "2024-08-13",
-					type: "BROKERAGE",
-				},
-			]);
-		},
-	);
+		await waitFor(() => expect(result.current?.isSuccess).toBe(true));
+		expect(requests).toHaveBeenCalledOnce();
+		expect(result.current?.data?.data).toEqual([
+			{
+				id: "account-1",
+				name: "Основной",
+				openedOn: "2024-08-13",
+				type: "BROKERAGE",
+			},
+		]);
+	});
 });

src/shared/api/authenticated-query.ts

@@ -1,6 +1,5 @@
 import {
 	type QueryKey,
-	useQueries,
 	useQuery,
 	type UseQueryOptions,
 	type UseQueryResult,
@@ -12,25 +11,6 @@ import {
 	subscribeAuthenticatedSession,
 } from "./client";
 
-function useAuthenticatedQueries<TData, TError, TQueryKey extends QueryKey>(
-	queries: UseQueryOptions<TData, TError, TData, TQueryKey>[],
-) {
-	const hasSession = useHasAuthenticatedSession();
-
-	return useQueries({
-		queries: queries.map(
-			(options): UseQueryOptions<TData, TError, TData, TQueryKey> => ({
-				...options,
-				enabled: query =>
-					hasSession
-					&& (typeof options.enabled === "function"
-						? options.enabled(query)
-						: (options.enabled ?? true)),
-			}),
-		),
-	});
-}
-
 function useAuthenticatedQuery<
 	TQueryFunctionData = unknown,
 	TError = Error,
@@ -58,4 +38,4 @@ function useHasAuthenticatedSession() {
 	);
 }
 
-export { useAuthenticatedQueries, useAuthenticatedQuery };
+export { useAuthenticatedQuery };

src/shared/api/client.ts

@@ -208,51 +208,50 @@ function parseJson(body: string): unknown {
 }
 
 async function readAttempt(request: Request): Promise<ReadAttempt> {
-	const controller = new AbortController();
-	const failure: { reason?: "abort" | "timeout" } = {};
-
-	const { promise: deadline, reject: rejectDeadline }
-		= Promise.withResolvers<never>();
-
-	const timeout = setTimeout(() => {
-		failure.reason = "timeout";
-		controller.abort();
-		rejectDeadline(abortError());
-	}, GET_DEADLINE_MS);
-
-	const abort = () => {
-		failure.reason = "abort";
-		controller.abort();
-		rejectDeadline(abortError());
-	};
-
-	request.signal.addEventListener("abort", abort, { once: true });
-	const timedRequest = new Request(request, { signal: controller.signal });
+	// Manual timeout (not AbortSignal.timeout) so fake-timer tests can advance it.
+	const timeout = new AbortController();
+	const timer = setTimeout(() => timeout.abort(), GET_DEADLINE_MS);
+	const signal = AbortSignal.any([request.signal, timeout.signal]);
 
 	try {
-		const response = await Promise.race([fetch(timedRequest), deadline]);
-		const body = await Promise.race([response.text(), deadline]);
-		const problem = parseJson(body);
+		// MSW keeps a stalled body readable after abort, so keep the race.
+		const response = await Promise.race([
+			fetch(new Request(request, { signal })),
+			rejectOnAbort(signal),
+		]);
+
+		const body = await Promise.race([response.text(), rejectOnAbort(signal)]);
 
 		return {
-			problem,
+			problem: parseJson(body),
 			reason: "transient",
 			response: new Response(body, response),
 		};
 	}
 	catch (error) {
-		if (failure.reason === "abort") return { reason: "abort" };
-		if (failure.reason === "timeout" || isNetworkFailure(error))
+		if (request.signal.aborted) return { reason: "abort" };
+		// Timeout or network failure: retryable.
+		if (timeout.signal.aborted || isNetworkFailure(error))
 			return { reason: "transient" };
 
 		throw error;
 	}
 	finally {
-		clearTimeout(timeout);
-		request.signal.removeEventListener("abort", abort);
+		clearTimeout(timer);
 	}
 }
 
+function rejectOnAbort(signal: AbortSignal): Promise<never> {
+	return new Promise((_resolve, reject) => {
+		// The signal is either already aborted or one of two parents firing once.
+		signal.addEventListener(
+			"abort",
+			() => reject(abortError()),
+			{ once: true },
+		);
+	});
+}
+
 function retryAfterMs(response: Response): number | undefined {
 	const header = response.headers.get("Retry-After");
 	if (!header) return undefined;

src/shared/api/resource-query.test.tsx

@@ -37,38 +37,6 @@ function auth() {
 }
 
 describe("persistent resource query lifecycle", () => {
-	it("observes once into the canonical cache without another import", async () => {
-		auth();
-		const modes: (null | string)[] = [];
-		let observations = 0;
-		server.use(
-			http.get(
-				"*/api/v1/brokerage-accounts/:accountId/portfolio",
-				({ request }) => {
-					const mode = new URL(request.url).searchParams.get("sync");
-					modes.push(mode);
-					if (mode) observations += 1;
-
-					return HttpResponse.json(
-						resource(snapshot, {
-							dataRevision: observations > 0 ? "new" : "old",
-						}),
-					);
-				},
-			),
-		);
-		const { queryClient, wrapper } = createQueryWrapper();
-		const { result } = renderHook(() => usePrivateResource("a"), { wrapper });
-		await waitFor(() => expect(result.current.isSuccess).toBe(true));
-		await act(() => result.current.observe());
-		await waitFor(() => expect(result.current.meta?.dataRevision).toBe("new"));
-
-		expect(modes).toEqual([null, "observe"]);
-		expect(queryClient.getQueryCache().getAll()).toHaveLength(1);
-		expect(
-			queryClient.getQueryData(resourceOptions("a").queryKey),
-		).toMatchObject({ data: snapshot, meta: { dataRevision: "new" } });
-	});
 	it("keeps successful HTTP state distinct from missing or failed source data", async () => {
 		auth();
 		server.use(
@@ -136,47 +104,6 @@ describe("persistent resource query lifecycle", () => {
 		expect(result.current.isSuccess).toBe(true);
 		expect(result.current.isPending).toBe(false);
 	});
-	it("keeps the observed snapshot when an older query finishes later", async () => {
-		auth();
-
-		const { promise: blocked, resolve: release }
-			= Promise.withResolvers<void>();
-
-		let isStarted = false;
-		server.use(
-			http.get(
-				"*/api/v1/brokerage-accounts/:accountId/portfolio",
-				async ({ request }) => {
-					if (!new URL(request.url).searchParams.has("sync")) {
-						isStarted = true;
-						await blocked;
-
-						return HttpResponse.json(resource({ ...snapshot, isStale: true }));
-					}
-
-					return HttpResponse.json(resource(snapshot));
-				},
-			),
-		);
-
-		const { result } = renderHook(() => usePrivateResource("a"), {
-			wrapper: createQueryWrapper().wrapper,
-		});
-
-		await waitFor(() => expect(isStarted).toBe(true));
-		// Capture the observation promise before releasing the old handler; the
-		// final assertion must follow its settlement, not the handler release.
-		let observation: Promise<unknown> = Promise.resolve();
-		await act(async () => {
-			observation = result.current.observe() ?? Promise.resolve();
-			await observation;
-		});
-		await act(async () => {
-			release();
-			await observation;
-		});
-		expect(result.current.data).toEqual(snapshot);
-	});
 	it("clears private snapshots on confirmed access loss and fences another pending success", async () => {
 		auth();
 		let isDenied = false;

src/shared/api/resource-query.ts

@@ -1,6 +1,5 @@
 import {
 	type QueryClient,
-	type QueryFunctionContext,
 	useQueryClient,
 	type UseQueryOptions,
 } from "@tanstack/react-query";
@@ -9,7 +8,6 @@ import { useEffect } from "react";
 import type { components, paths } from "./generated/schema";
 
 import { useAuthenticatedQuery } from "./authenticated-query";
-import { getAuthenticatedSessionSnapshot } from "./client";
 import { apiErrorCode, isBrokerageAccessLoss } from "./problem-details";
 
 type InvestmentResourceMeta = components["schemas"]["InvestmentResourceMetaDto"];
@@ -31,7 +29,7 @@ type ResourcePath = {
 type ResourceQueryKey = readonly [
 	"get",
 	ResourcePath,
-	{ params?: { path?: object; query?: { sync?: "observe" } } }?,
+	{ params?: { path?: object; query?: object } }?,
 ];
 
 function invalidateResourceAccess(
@@ -57,22 +55,6 @@ function invalidateResourceAccess(
 		});
 }
 
-// Keep endpoint and parameters intact. The generated queryFn accepts the
-// optional sync mode even for a cache key originally created without init.
-function observationKey<K extends readonly unknown[]>(key: K): K {
-	const [method, path, init] = key as unknown as [
-		string,
-		string,
-		{ params?: { path?: object; query?: object } }?,
-	];
-
-	return [method, path, {
-		...init,
-		params: { ...init?.params, query: { ...init?.params?.query, sync: "observe" } },
-	}] as unknown as K;
-}
-
-// Observation changes transport mode, never the generated cache identity.
 function useResourceQuery<
 	T extends Resource,
 	E = unknown,
@@ -92,50 +74,17 @@ function useResourceQuery<
 		if (group) invalidateResourceAccess(client, group, query.error);
 	}, [client, group, query.error]);
 
-	const observe = async () => {
-		const queryFunction = options.queryFn;
-		if (
-			typeof queryFunction !== "function"
-			|| !query.isEnabled
-			|| !getAuthenticatedSessionSnapshot()
-		)
-			return;
-		// Cancellation is synchronous; start the replacement in the same boundary.
-		void client.cancelQueries({ exact: true, queryKey: options.queryKey });
-
-		return client.query({
-			...options,
-			queryFn: async (context: QueryFunctionContext<K>) => {
-				const queryKey = observationKey(context.queryKey);
-
-				return queryFunction({ ...context, queryKey });
-			},
-			retry: false,
-			// Keep the cache envelope independent of observer projection.
-			select: undefined,
-			staleTime: 0,
-		});
-	};
-
 	const data: T["data"] | undefined = query.data?.data;
 	const meta: T["meta"] | undefined = query.data?.meta;
 
 	// Project resource fields; refetch still returns the transport envelope.
+	// queryKey is kept for screen-sync cache bookkeeping.
 	return {
+		// eslint-disable-next-line @tanstack/query/no-rest-destructuring -- Single projection point; consumers already depend on the whole query state.
+		...query,
 		data: data ?? undefined,
-		error: query.error,
-		fetchStatus: query.fetchStatus,
-		isEnabled: query.isEnabled,
-		isError: query.isError,
-		isFetching: query.isFetching,
-		isLoading: query.isLoading,
-		isPending: query.isPending,
-		isSuccess: query.isSuccess,
 		meta,
-		observe,
 		queryKey: options.queryKey,
-		refetch: query.refetch,
-		status: query.status,
 		sync: query.data && "sync" in query.data ? query.data.sync : undefined,
 	};
 }