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Graph/async-call-signature-mismatch

AntiPattern

Async Invocation Semantics Errors

async-call-signature-mismatch

Async APIs break when call signatures and execution semantics are misused—passing arguments in the wrong order, marking framework hooks as coroutines, or performing blocking I/O inside async code—leading to deadlocks, fixture failures, and cross-test state corruption.

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Updated7/14/2026

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30 linked nodes

MATCHESSolution

const usePermissionsStoreAsync = hook(usePermissionsStore, /*suspense*/false); — const YourComponent = () => {. Tension: if (userPermissions.isLoading) { return Loading... ; } if (userPermissions.error) { return An error occurred ; }. Outcome: Try Leo Query. It handle's async data for Zustand.

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Mock axios.get and await the assertion with waitFor()

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And HTTP Client errors (if you're using `HttpClient` or `HttpClientFactory`) — On ASP.NET Core. Tension: you just need to opt-in. Outcome: options.CaptureFailedRequests = true;.

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delete the async from `fake_execute` — your `AsyncContextMock` needs to handle both use cases in your endpoint `await conn.execute()` and `async with conn.execute()`. Outcome: just make it a regular function so it returns your context manager directly, no coroutine wrapper.

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single worker running async loop. Outcome: So you have a single worker running async loop and you block that loop.

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If you convert all operations to perform asynchronously (using `aiosqlite`) , the issue will be mitigated. — When a route in FastAPI is listed as asynchronous (`async def`). Tension: that doesn't fully solve the inherent single writer problem of Sqlite. Outcome: Here's a fully operational update of the FastAPI server logic:.

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Removing `async` before the function definition solved it. — class LoggingAPIRoute(APIRoute):. Outcome: def get_route_handler(self) -> Callable:.

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use httpx or aiohttp e.g: — async def test_api(request: Request):. Tension: requests(which is synchronous) inside async function. Outcome: async with client.stream("POST", "http://127.0.0.1:8000/test_api",json={} ) as response: async for chunk in response.aiter_bytes(chunk_size=1234): yield chunk.

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You need to install helper packages, such as `anyio` or `pytest-asyncio`. — Async fixtures do not work out of the box. Tension: NB. Use pytest_asyncio.fixture NOT pytest.fixture. Outcome: Example.

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Change the engine async fixture from session scope to function scope (remove scope="session") so all async fixtures/tests run on the same event loop, preventing the cross-loop Future/Task error.

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I'd like to use `AsyncSession.sync_session` — async def get_session() -> AsyncSession: session = SessionLocal(). Tension: the code below fails with error. Outcome: use `AsyncSession.sync_session` but the code below fails with error.

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the reason for the various threads appearing in the logs — when you pass a synchronous generator to `EventSourceResponse`. Tension: a normal `def` function instead of `async def`. Outcome: please take a look at the implementation of the `EventSourceResponse` class.

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use `pytest_asyncio` and the async fixture — If you don't want to utilize an `AsyncClient` like the one by `httpx`. Tension: ensuring that the FastAPI app's lifespan context correctly works.

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I usually do manage the exceptions through the `exception_handler`-s — here is how I would implement handling the `asyncio.exceptions.CancelledError`. Tension: so it can scale more when the project grows. Outcome: return JSONResponse( status_code=400, content={"message": error_message}, ).

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any time you have an I/O bound process with lots of idle time — waiting for user input, waiting for a TLS handshake. Tension: wrapping it in an async task can let other code run.

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Initialize Eureka using the async API (e.g., `eureka_client.init_async(...)`) and/or move initialization into an appropriate async startup hook so it doesn’t start a new event loop at import time.

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implementing this retry behavior all over the place — axiosInstance.js. Tension: handle the retry logic. Outcome: you could try using a response interceptor to abstract and handle the retry logic.

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An async function was passed to useActionState.

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Or you can use `async/await` and `try/catch` — createAsyncThunk. Outcome: return data.

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Avoid running multiple DB operations concurrently on the same session by removing asyncio.gather and iterating sequentially, and/or use an async_scoped_session so each task uses its own session.

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case "CallbackRouteError": return { error: "Invalid credentials!" } — in my `login.ts` server action in the switch case clause. Tension: to return the correct errors. Outcome: bypass this error.

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How can I get hold of the query metrics in this async setup? — The Couchbase documentation mentions to switch to the Reactive and Async APIs. Tension: the blocking API is really just a wrapper: it contains both the rows and the metadata (including metrics). In the reactive API this is split. Outcome: you can also call `result.metaData()` to access metrics, warnings, and the rest of the metadata.

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Use asynchronous sending with callbacks. — If you're using KafkaTemplate.send() without handling the ListenableFuture returned. Tension: you're effectively blocking the calling thread until the message is acknowledged by the Kafka broker. Outcome: The addCallback method allows you to execute code when the send operation succeeds or fails, without blocking the main thread.

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You can use `async_compose` to create the composed operation — This initiation function can be used with any completion token. Tension: but I'd prefer a more lightweight approach. Outcome: Consider the `co_composed` initiator or `asio::deferred`.

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Rewrite the test as an async test and run it with an async test runner (e.g., pytest.mark.asyncio), using await on the async ORM methods (acreate/acount) instead of asyncio.run().

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Use Component.Task (TaskSource) for all async work inside components — inside components. Tension: it auto-cancels when the component is destroyed.

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anonymous REST adapters and lazy registration — TypeScript/Hono agent platform. Tension: non-MCP agents and anonymous write attempts hit avoidable friction.

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Updated tool gating and A2A — call args into anonymous shape checks. Tension: pass call args into anonymous shape checks. Outcome: append anonymous countdown footers.

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Two curl calls in sequence against the Railway production URL — Schema must complete before bootstrap. Tension: bootstrap needs the constraints and vector indexes in place. Outcome: Apply schema first (synchronous — waits for completion).

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Rebuilt App.tsx as the OracleController beat machine. Outcome: running the authored cascade arrest→anchor→recognition→locked on setTimeout timers.

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