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Graph/conditional-runtime-data-access

Pattern

Conditional Runtime Data Access

conditional-runtime-data-access

Lazy or optional inputs (undefined context, null bookingId, initial state only set once) cause hooks/queries to run too early or never, leading to stale UI state, missed API calls, and hard-to-reproduce failures.

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Public graph metadata

Updated7/7/2026

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30 linked nodes

React app loading state behaves unpredictably because useEffect runs twice in Strict Mode

Initializing a Zustand store with data fetched asynchronously from an API is messy when using a separate init() function, requiring extra state like isInitialized to prevent subscribers from running too early. The store creation function cannot be async, so awaiting fetches during createStore is not possible.

user is changing the dropdown value before the hydration — slow networks. Tension: which doesnt trigger any event handlers as hydration didnt complete. Outcome: page should again be in the state that it is rendered during SSR changing dropdown value to default irrespective of user changes before hydration.

React throws "Invalid hook call" when Zustand hooks are accessed via an Inversify-injected service (TypeScript) outside of a React component.

React context data loaded from localStorage in a Next.js app either requires disabling SSR to avoid hydration mismatches, or causes significant delayed hydration/content layout shift compared to other client components.

A Zustand store value (e.g., currentUser) logs as null on first access, but becomes correct after a rerender. This suggests the expected persisted data hasn’t finished loading yet.

After migrating to React 18, dynamically importing a language-specific component with React.lazy based on a zustand state variable causes the component to infinitely render/loading.

Deciding where to wire socket event listeners to keep client state in sync: inside React hooks/components (registering callbacks in useEffect) versus inside a middleware/store layer or the socket class itself. The question also asks about the downsides of each approach.

Custom shadcn components do not update state correctly, so the form logs unexpected values

the data will Suspend and get fetched on the server but never be hydrated to the client — If you do forget to prefetch a query when you are using useSuspenseQuery. Tension: the consequences will depend on the framework you are using.

Rendered more hooks than during the previous render — if (!data) { return; }. Tension: calling a hook after a condition.

The custom React hook `useGetConsultasByStatusQueryDate` is called conditionally inside an `if` block based on `filter`, causing the error that React Hooks must be called in the same order on every render.

would prefer to not call `convertDataToTasks` inline in JSX when rendering — React-Query to cache the data you want to render from. Tension: especially caching.

I'm trying to understand the difference between the initialData and placeholderData options in the React Query v5 useQuery hook. — in the React Query v5 useQuery hook. Tension: I'm unclear on when to use each of these options. Outcome: What are the specific scenarios or use cases where `initialData` or `placeholderData` would be more appropriate?

Using `useRef` inside a hook that needs a reference for a DOM node that may not exist or change during the component's render — popups, dialogs, etc. Tension: may cause stale references or missed updates. Outcome: keeping the state consistent with the latest DOM element.

vue-query hooks can only be used inside setup() function or functions that support injection context. — Whenever I try to call useQuery inside a function. Tension: I need to query an API as a side-effect of an action. Outcome: I concluded that vue-query can only be called from setup function only.

Unhandled Runtime Error Error: Maximum call stack size exceeded — trying to fetch data on the server instead of the client so I went with the hydrate method. Tension: worked fine fetching on client. Outcome: same result.

trying to perform data processing during the application's startup. Tension: This limitation forces me to manually create instances of these dependencies. Outcome: this approach doesn't work as expected.

a read-looking endpoint (`GET /v2/packages`) enqueued a background job on a cache miss with no flag check. Tension: Any other caller of the same service bypassed the gate entirely. Outcome: An authenticated client could therefore drive arbitrary writes into production through the side door.

global shared variable may be accessed before it has been initialized

I need to make sure it's only initialized once — my configuration object that's used everywhere inside the app. Tension: its contents as well as how it is initialized depend on a bunch of things that change depending on the deployment environment.

In RTK Query, after performing a mutation (e.g., login), the developer cannot easily select/read the data that the mutation stored in the cache from another component/hook instance.

the loading state becomes false before the transformedData and transformedConfig are updated — data is being fetched and transformed. Tension: an additional render occurs where the grid briefly shows no data.

RTK Query hook export triggers ts(2742): inferred type cannot be named without a reference to buildHooks

The second click on the RTK Query lazy mutation/query trigger does not update the `isLoading` state; `isLoading` stays false on subsequent calls.

Validation errors set inside the onSave/submit handler are not reflected in formMethods.formState.errors when checked immediately, leading to incorrect conditional logic. The developer expects updated errors to be available in the same callback scope.

React Router navigation/refresh triggers a 'change in order of Hooks' error in Account.jsx. This happens because the component sometimes returns early before calling hooks.

Dynamic memory allocation is ill-advised in any event in most small scale and real-time embedded applications — in most small scale and real-time embedded applications. Tension: non-deterministic timing, the need to deal with the potential for failure and memory exhaustion. Outcome: particularly ill-advised in (and generally prohibited) safety critical systems.

developers don't know what state survives a hotload, what gets reset, and how to write hotload-safe code — In s&box, hotloading (live code reload without restarting the game) works automatically during development. Tension: Static fields survive hotloads but component state is re-initialized.

relying on non-standard properties like `req.socket._start_time` can lead to incorrect or missing timing data — When calculating request latency in an HTTP server. Tension: especially in environments where the property is not defined. Outcome: This can result in inaccurate latency metrics, which are critical for performance monitoring and debugging.

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