@particle-academy/fancy-query

Server-state for React + Inertia + Reverb apps — a thin wrapper over TanStack Query that adds the three integrations you'd otherwise hand-roll per component:

• Inertia page-prop hydration — seed the cache from usePage().props so the first render is hydrated with no fetch.
• Echo-event → query invalidation — a declarative event → keys map.
• Echo-event → in-place cache updates — for streaming/agentic surfaces, map events onto setQueryData reducers instead of refetching.
• Auto-invalidating mutations — mutate, then refetch the keys it touched.

The value-add is the integrations, not the cache. TanStack Query, @inertiajs/react, and react are peer dependencies — nothing is bundled, and apps that don't use a data hook tree-shake the package away.

Status: pre-1.0. Public API is in place (query / mutation / invalidation / hydration / streaming); comprehensive tests, the fancy-inertia withData composition, and a few edge cases are tracked in Tynn.

Install

npm install @particle-academy/fancy-query @tanstack/react-query

First-party socket client

@particle-academy/fancy-query/socket supplies the EchoLike transport without laravel-echo or pusher-js. The separate entry imports no React, Inertia or query runtime. It connects lazily when a channel is acquired, so constructing the client during SSR starts no connection. The host owns its lifecycle:

import { createSocketEcho } from '@particle-academy/fancy-query/socket';

const echo = createSocketEcho({
  url: 'wss://socket.example/app/PUBLIC_APP_KEY',
  authorize: async ({ socketId, channelName }, signal) => {
    const response = await fetch('/broadcasting/auth', {
      method: 'POST', credentials: 'same-origin', signal,
      headers: { 'Content-Type': 'application/json',
        'X-CSRF-TOKEN': document.querySelector<HTMLMetaElement>('meta[name="csrf-token"]')?.content ?? '' },
      body: JSON.stringify({ socket_id: socketId, channel_name: channelName }),
    });
    if (!response.ok) throw new Error('Channel authorization refused');
    return response.json();
  },
});
// Supply echo to FancyDataRoot; call echo.disconnect() when its host closes.

The server endpoint must authenticate the caller and authorize the specific channel. Only the public app key is sent to the browser; keep the app secret on the server. channel, private and join implement the minimal EchoLike contract. Private and presence subscriptions require authorize; presence also requires its signed channel_data. Encrypted channels and client-event publishing are unsupported. Laravel event namespaces work as in Echo; set namespace: false for raw protocol names, or prefix a custom event with ..

Each channel acquisition owns one lease. Hooks release their own lease; manual subscriptions must pair channel/private/join with leave, using the full name such as private-room.3 to isolate that subscription. Reconnects reauthorize with the new socket ID. Refetch authoritative state after each acknowledgement to recover missed events:

const room = echo.private('room.3').subscribed(() => refreshRoom());
room.listen('.cms.updated', applyUpdate);
// On cleanup: room.stopListening('.cms.updated', applyUpdate);
// echo.leave('private-room.3');

onState and onError expose connection status and bounded failure codes. Heartbeats, handshake/authorization timeouts and capped reconnect backoff follow the Pusher protocol. Fatal 4000–4099 close codes stop automatic retries. The host can explicitly connect() again after correcting configuration. Hosts using another Echo implementation retain control of that implementation's connection lifecycle.

The standard flow

Mutation OR Echo event → invalidate keys → cache refetches once → every subscribed component updates automatically.

Before — ad-hoc per component

const [tools, setTools] = useState([]);
useEffect(() => { fetchTools().then(setTools); }, [filters]);
useEffect(() => {
  const h = () => fetchTools().then(setTools);
  ["x-created", "x-updated"].forEach((ev) => window.addEventListener(ev, h));
  return () => ["x-created", "x-updated"].forEach((ev) => window.removeEventListener(ev, h));
}, []);

After — with fancy-query

const { data: tools } = useFancyQuery(["org-tools", filters], () =>
  api.get("/api/org/compass-tools", { filters }),
);

useFancyEchoInvalidation(`private-org.${orgId}`, {
  CompassToolUpdated: ["org-tools"],
  CompassToolDeleted: ["org-tools"],
});

A second component reading ["org-tools", filters] in the same render gets the cached result — no extra request.

Streaming — patch the cache, don't refetch

For chat + agentic surfaces, invalidate-and-refetch is the wrong tool: a token stream or a chat backlog wants the broadcast appended to what's already cached, not a full reload that drops in-flight optimistic state. useFancyStream maps Echo events onto setQueryData reducers:

const { data: messages, isStreaming, append } = useFancyStream(["chat", chatId], {
  channel: `private-chat.${chatId}`,
  fetchInitial: () => api.get(`/api/chat/${chatId}/history`),
  on: {
    "post.created":     (cache, e) => [...(cache ?? []), e.post],
    "post.delta":       (cache, e) => patchLast(cache, e.delta),
    "stream.completed": (cache, e) => reconcile(cache, e),
  },
  // Recover broadcasts dropped while the socket was down.
  poll: { while: "streaming", intervalMs: 4000 },
});

// Optimistically show the user's own message before the server echoes it.
const send = (text) => { append({ id: tempId(), text, pending: true }); api.post(...); };

isStreaming flips on stream.started / stream.completed by default (configurable via streaming, or streaming: false to skip). The Echo connection is still owned by the consumer — same channel-prefix rules and FancyDataRoot wiring as useFancyEchoInvalidation.

For real chat / tool-execution state machines, the reducer map isn't enough — so there's an escape hatch alongside it:

useFancyStream(["chat", chatId], {
  channel, fetchInitial: (prev) => mergeHistory(prev, await api.history(chatId)),
  on: { "post.created": (cache, e) => [...(cache ?? []), e.post] },   // pure cache
  onEvent: (event, payload, { setData, refetch }) => {                // side effects
    if (event === "fallback.triggered") window.dispatchEvent(new CustomEvent("…", payload));
    if (event === "stream.failed") refetch();
  },
  events: ["fallback.triggered"],                  // subscribe for onEvent only
  streaming: { endEvent: ["stream.completed", "stream.failed"] },   // multiple terminals
  poll: { while: "streaming", intervalMs: 4000, commit: (next) => turnDone(next) }, // merge, don't clobber
  flushSync: true,                                 // paint streamed events instantly
});

• onEvent runs for every subscribed event outside the cache reducer — for window events, transient UI state, async reconciles.
• fetchInitial(prev) receives the previous cache, and poll.commit gates whether a recovery refetch is applied — so the poll merges instead of wiping in-flight streamed posts.
• streaming.startEvent/endEvent accept a list; flushSync opts into synchronous paints.

End to end

// 1. Mount once — near the root (or via fancy-inertia's FancyAppRoot withData).
import { FancyDataRoot } from "@particle-academy/fancy-query";

<FancyDataRoot echo={window.Echo}>
  <App />
</FancyDataRoot>;

// 2. A page that received ['tools' => $tools] hydrates the cache.
import {
  useFancyQuery,
  useFancyMutation,
  useFancyEchoInvalidation,
} from "@particle-academy/fancy-query";
// Inertia-only hook — own subpath so non-Inertia apps never touch
// the optional @inertiajs/react peer.
import { useInertiaHydration } from "@particle-academy/fancy-query/inertia";

function ToolsPage({ orgId }) {
  useInertiaHydration({ tools: ["org-tools"] });

  // 3. Read — hydrated first render, then cached + deduped.
  const { data: tools } = useFancyQuery(["org-tools"], () =>
    api.get("/api/org/compass-tools"),
  );

  // 4. Mutate — invalidates the same key on success.
  const { mutate, isPending } = useFancyMutation({
    mutationFn: (payload) => api.post("/api/org/compass-tools", payload),
    invalidates: ["org-tools"],
  });

  // 5. Real-time — the same key invalidates on a broadcast.
  useFancyEchoInvalidation(`private-org.${orgId}`, {
    CompassToolUpdated: ["org-tools"],
    CompassToolDeleted: ["org-tools"],
  });

  return /* … */;
}

API

| Export | What it does | |---|---| | FancyDataRoot | Mount-once provider: one QueryClient (+ optional Echo client) for the app. | | createFancyQueryClient(config?) | A QueryClient with the Fancy defaults (override-friendly). | | FANCY_QUERY_DEFAULTS | staleTime: 30s, gcTime: 5m, refetchOnWindowFocus, one retry. | | useFancyQuery(key, fn, options?) | useQuery with the ergonomic signature; full options pass through. | | useFancyMutation({ mutationFn, invalidates, … }) | useMutation that invalidates keys on success. | | useFancyEchoInvalidation(channel, eventMap, options?) | Subscribe + invalidate on broadcasts. | | useFancyStream(key, options) | Subscribe + patch the cache in place via per-event setQueryData reducers (streaming/chat). | | useInertiaHydration(map, options?) | Seed the cache from Inertia page props. Import from @particle-academy/fancy-query/inertia (needs the @inertiajs/react peer). | | useQueryClient, QueryClient, toQueryKeys | Re-exported primitives. |

License

MIT © Particle Academy

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