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Graph/missing-return-in-async-flow

AntiPattern

Missing Return Breaks Flow

missing-return-in-async-flow

Missing a required return causes async control flow to short-circuit—promises (fetch), error recovery (Mono.empty), or header/body writes can never complete as expected, leading to silent failures, incorrect responses, or runtime TypeErrors.

Node Details

Public graph metadata

Updated7/5/2026

Connections

30 linked nodes

MATCHESSolution

handle a scenario when the code is fine but backend went offline — prefetching data with usePrefetchQuery. Tension: prefetch works.

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Remove the catch handlers or re-throw the error after handling it so useMutation can trigger onError

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What should be done in each page like this — export default async function AdminUsersList(). Tension: I just can't figure out why it doesn't pick it up from layout. Outcome: This.

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myEndpoint must return a Promise — Please note, that above method is synchronous just to check if that makes difference, but it is not. Tension: my template is keep displaying "Loading..".

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We can fix this by giving a default response like this: — app/api/test/route.ts. Tension: No response is returned from route handler. Outcome: return NextResponse.json({data: "Uh oh! Resource Not Found"}, {status: 404}).

MATCHESSolution

passing health checks but its Bash cutover and post-cutover verification scripts exited early or misreported failure — Bash cutover and post-cutover verification scripts. Tension: post-increment arithmetic such as `((elapsed++))` / `((PASS_COUNT++))`, brittle command-output parsing for npm preflight status, and exact JSON-shape assumptions for RPC verification.

MATCHESSolution

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

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using `magicmock` to mock it could lead to unusual or unexpected behavior when checking for call counts — Since `get_item` might be an asynchronous function in your middleware. Tension: using `magicmock` to mock it could lead to unusual or unexpected behavior. Outcome: which is designed to work with async functions.

MATCHESSolution

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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bound it with a "progress ceiling" — a process emitting bytes but making NO semantic progress. Tension: a process emitting bytes but making NO semantic progress (livelock) would be shielded forever. Outcome: re-arms recovery after a long no-progress window even while bytes flow.

MATCHESSolution

You are not allowed in Redux, ever, to dispatch from inside a reducer. — Reducer logic has to be a pure synchronous function without side effects. Tension: You might want to do the logic you are currently doing in a thunk or with the listener middleware instead. Outcome: You have to use `createAsyncThunk` for that.

MATCHESSolution

could re-call just the endpoint. Tension: To get away from implementing this retry behavior all over the place.

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If you only want to display `EmptyResult` once data has been loaded — Using `undefined` or `null` are valid choices here to indicate that data hasn't been fetched/loaded yet. Tension: differentiate the states and loading conditions. Outcome: Using `undefined` or `null` are valid choices here.

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An async function was passed to useActionState.

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Do not reset the entire API slice state during the mutation lifecycle; instead rely on the sendLogout trigger promise/unwrap (or on isSuccess without resetting) to run navigate("/") after the mutation succeeds.

MATCHESSolution

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

MATCHESSolution

Async-iterate the Result instead of awaiting `.records` — The driver's Result is async-iterable. Tension: Combined with a streaming HTTP response, records flow end-to-end without any single buffer. Outcome: records flow end-to-end without any single buffer.

MATCHESSolution

You forget to return the `fetch()` promise in the `requestRobots` thunk. Tension: it is giving only REQUEST_ROBOTS_PENDING and for other action when i run npm test it is giving undefined. Outcome: return fetch('https://jsonplaceholder.typicode.com/users').

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Outcome: it doesn't get broken into multiple lines.

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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.

MATCHESSolution

You can pass out a return value from the transaction to allow you to know its status — Try something like this. Tension: do all the failed/succeded to enroll logic outside after result. Outcome: decrement the counter directly.

MATCHESSolution

track errors across the Flux — stopSignal = Sinks.one();. Tension: signal termination when the threshold is reached. Outcome: takeUntilOther(stopSignal.asMono()).

MATCHESSolution

if (errorCount.incrementAndGet() >= maxErrors) — onErrorResume(error -> {. Tension: Skip failed paths. Outcome: return Mono.empty();.

MATCHESSolution

I am seeing an increase in latencies in requests that do succeed — I have a logic of the sort :. Tension: none of them enforce a timeout on the total duration of the request. Outcome: Then properly close the connection in a finally / try-resource block.

MATCHESSolution

handle the errors for each `Mono` separately — Mono.zip to combine three Monos. Tension: if any of the Monos in `Mono.zip` fail, the entire operation is cancelled. Outcome: you can use `onErrorResume` or `onErrorReturn` to catch the errors and provide fallback values.

MATCHESSolution

Hono runs on top of Node's `http.IncomingMessage`/`ServerResponse`. Tension: otherwise it'll try to double-write headers. Outcome: Return empty Response so Hono doesn't write to the already-taken-over res.

MATCHESSolution

"Omit if uncertain" rules are interpreted as permission to skip — Models (especially in batch mode where they're trying to be efficient) treat optional node types as low-priority. Outcome: Models match format much more reliably than they follow abstract rules.

MATCHESSolution

Grep every exported function for call sites excluding its test file. — Checklist when a sophisticated system produces no measurable output. Tension: Code can lie by omission; live state can't. Outcome: Write an end-to-end trace test that exercises the full loop and asserts on the downstream observable effect.

MATCHESSolution

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

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