Nitro-V3/CLAUDE.md

Claude Code — project memory for Nitro-V3

This file is read automatically by Claude Code at session start. It captures the conventions and current state of this branch so a new session can hit the ground running.

TL;DR

This branch — feat/react19-modernization — is a long-running modernization of the Nitro V3 client: bump to React 19.2 idioms, add the supporting infrastructure (TanStack Query, Zustand, Vitest, React Compiler, error boundaries), split a few god-hooks, and audit logic bugs along the way. PR is #2 on simoleo89/Nitro-V3.

On top of the modernization work this branch also picks up a couple of upstream feature commits that lived only on duckietm/Nitro-V3 (PR #126): reset password / email / change username under user settings, and the wear-badge popup fix.

Local-dev game assets are served by a small Vite plugin (sirv middleware mounted on /nitro-assets and /swf, reading from E:\Users\simol\Desktop\DEV\Nitro-Files) — NOT by symlinking inside public/. The symlink path triggers chokidar on ~177k files and the dev server hangs for minutes on Windows. See vite.config.mjs and the .gitignore note.

Detailed status, decisions, and next steps live in docs/ARCHITECTURE.md — read that before starting anything non-trivial.

Commands

Goal	Command
Dev server	yarn start
Production build	yarn build
Serve production build	yarn preview (defaults to http://localhost:4173)
Lint	yarn eslint
Type-check (TS 7 native, fast)	yarn typecheck
Test (Vitest, once)	yarn test
Test (watch)	yarn test:watch

Setup walkthrough

1. Clone the renderer SDK as a sibling of this repo. vite.config.mjs resolves the @nitrots/* aliases against ../Nitro_Render_V3 (preferred) or ../renderer (legacy). If neither exists, the dev server and build now fail fast with a message pointing here.

   cd ..                            # parent of Nitro-V3
   git clone <renderer-repo> Nitro_Render_V3
   cd Nitro_Render_V3 && yarn install
   

2. Install client deps.

   cd ../Nitro-V3
   yarn install
   

3. Materialize the runtime configuration. public/configuration/ ships .example files. Copy the ones you need without the .example suffix and point them at your game server (websocket URL, asset base URL, UI texts, etc.). The dev server doesn't fail if these are missing but the client renders a blank/error screen at runtime.

4. Run.

   • Dev: yarn start (Vite, HMR, includes the renderer source).
   • Production preview: yarn build && yarn preview.

The renderer SDK (@nitrots/nitro-renderer) is consumed via a filesystem link to a sibling working tree — ../Nitro_Render_V3 (preferred) or ../renderer (legacy). Without it, yarn typecheck reports TS2307 across the codebase — that's expected on a sandbox without the renderer, not a regression.

Stack snapshot

• React 19.2.5, react-dom 19.2.5, @types/react 19.2.x.
• TypeScript: TS 6 for build, TS 7 native preview (@typescript/native-preview, invoked via tsgo) for the typecheck script.
• Vite 8 + @vitejs/plugin-react 6 + babel-plugin-react-compiler 1.0.
• ESLint 10 + typescript-eslint 8 + eslint-plugin-react-hooks@7 + eslint-plugin-react-compiler.
• TanStack Query 5 (@tanstack/react-query + devtools).
• Zustand 5.
• Vitest 3 + jsdom + @testing-library/react + @testing-library/jest-dom.
• react-error-boundary 6.

Layout convention (DO NOT CHANGE)

Established by the team and recorded in docs/ARCHITECTURE.md proposal #3 (rejected the src/features/ alternative). Stay on this layout — every PR that violates it will need to be reworked.

src/components/<area>/<feature>/         → views (.tsx only)
  e.g. src/components/room/widgets/doorbell/DoorbellWidgetView.tsx

src/hooks/<area>/<feature?>/             → hooks, FLAT files, no per-feature subfolder
  e.g. src/hooks/rooms/widgets/useDoorbellState.ts
       src/hooks/rooms/widgets/useDoorbellActions.ts
       src/hooks/rooms/widgets/useDoorbellWidget.ts (deprecated shim)

src/api/                                 → cross-cutting helpers (LocalizeText, composers, formatters)
src/common/                              → reusable UI primitives + error boundary
src/state/                               → Zustand stores (cross-feature only)
tests/                                   → Vitest suites (mirror filename of subject)

When splitting a god-hook the convention is 3 files, all flat in the hooks barrel directory:

• use<Feature>State.ts — state + event subscriptions + derived values
• use<Feature>Actions.ts — pure imperative actions (no state writes)
• use<Feature>Widget.ts — deprecated wrapper that composes the two and preserves the old return shape so existing consumers don't break

See useDoorbellState/useDoorbellActions/useDoorbellWidget as the canonical pattern.

Patterns to use

useNitroEventState / useMessageEventState

For "derived state from a single event" replace the two-step useState + useNitroEvent(e => setState(...)) with a single call:

const foo = useNitroEventState(SomeEvent, e => e.payload, initial);
const data = useMessageEventState(SomeParser, e => e.getParser()?.field ?? null, null);

The selector is held in a useLayoutEffect-refreshed ref so the listener stays registered across renders. Both hooks are exported from src/hooks/events.

useNitroQuery

For composer/parser request-response pairs:

const { data } = useNitroQuery<SomeParser, SomeData>({
    key: ['nitro', 'domain', 'request', ...args],
    request: () => new SomeComposer(args),
    parser: SomeParser,
    select: e => e.getParser()?.data,
    accept: e => e.getParser()?.correlationKey === args, // optional, for shared event bus
    staleTime: 60_000,
});

Already wired up; QueryClientProvider is mounted in src/index.tsx.

Companion useNitroEventInvalidator(eventType, queryKey, accept?) — import from src/api/nitro-query. Subscribes to the renderer event and invalidates the query slot on every push, so server-driven refresh paths work the same as the initial request/response (e.g. ClubGiftInfoEvent firing again after the user claims a gift).

Singleton-filter split for useBetween-based hooks

When a hook backs many consumers but most only need either state OR actions (not both), split it without breaking the shared-singleton guarantee:

// internal: state + actions in one closure
const useFooStore = () => {
    const [ data, setData ] = useState(...);
    // listeners, effects, actions ...
    return { data, doThing };
};

// public: read-only filter
export const useFooState = () => {
    const { data } = useBetween(useFooStore);
    return { data };
};

// public: imperative filter
export const useFooActions = () => {
    const { doThing } = useBetween(useFooStore);
    return { doThing };
};

// deprecated shim — keeps the historical return shape
export const useFoo = () => useBetween(useFooStore);

useBetween ensures all three entry points hit the same store instance, so listeners/effects register once. Used by useWiredTools, useTranslation, useNotification, useFriends.

Zustand stores

For cross-feature UI state (avoid module-level let):

import { createNitroStore } from '@/state/createNitroStore';

export const useFooStore = createNitroStore<FooState>()((set) => ({
    ...
}));

Components subscribe to slices, not the whole store:

const value = useFooStore(s => s.value);

First adoption: src/components/navigator/views/navigatorRoomCreatorStore.ts.

WidgetErrorBoundary

Wrap any in-room widget tree so a crash degrades gracefully (logs to NitroLogger, falls back to null). Already applied at RoomWidgetsView as an umbrella; per-widget wrapping is a follow-up.

<WidgetErrorBoundary name="ChatWidget">
    <ChatWidgetView />
</WidgetErrorBoundary>

Form Actions

Login / Register / Forgot in src/components/login/LoginView.tsx use useActionState + useFormStatus. The legacy non-Action versions in src/components/login/components/{Register,Forgot}Dialog.tsx and shared.ts have been removed (dead code).

Configuration pre-init in bootstrap

src/bootstrap.ts calls await GetConfiguration().init() before importing ./index. Otherwise the first paint dumps a flood of "Missing configuration key" warnings while components synchronously read asset.url, login.endpoint, … against an empty store before prepare()'s deferred init lands.

Asset serving in dev

Game assets (bundled/, c_images/, gamedata/, swf/...) are NOT copied or symlinked under public/. They're served by a custom Vite plugin (nitroAssetsServer in vite.config.mjs) that mounts sirv on /nitro-assets and /swf, reading from E:\Users\simol\Desktop\DEV\Nitro-Files\. sirv is a connect-style middleware that bypasses chokidar entirely, so the ~177k asset files never enter the watch graph. The plugin also wires the same handler into configurePreviewServer so yarn preview keeps working.

What's wired up and what isn't

Adopted	Pilot sites
useNitroEventState + companions (Reducer, ExternalSnapshot)	OfferView, useAvatarInfoWidget (figure/badges/group reducer), useInventoryFurni (pure reducers + fragments useRef)
useNitroQuery + useNitroEventInvalidator	OfferView, CatalogLayoutRoomAdsView, ModToolsChatlogView, CfhChatlogView, useGiftConfiguration, useUserGroups, useClubOffers(windowId), useSellablePetPalette(breed), useMarketplaceConfiguration, useClubGifts (with invalidator)
Zustand	NavigatorRoomCreatorView (useRoomCreatorStore)
God-hook split (state + actions + shim)	doorbell, poll, furni-chooser, user-chooser, friend-request, chat-input
God-hook split (useBetween singleton + state filter + actions filter + shim)	wired-tools, translation, notification, friends, catalog (three-way: useCatalogData / useCatalogUiState / useCatalogActions, plus the useCatalog shim)
WidgetErrorBoundary	RoomWidgetsView umbrella
Vitest	163/163 cases — pure helpers + Zustand store + 2 component-/hook-level pilots (WidgetErrorBoundary, useDoorbellState) on top of the renderer-SDK mock at tests/mocks/renderer-mock.ts, 34 cases on the catalog pure helpers, 5 contract cases on the catalog filters
Form Actions	Login / Register / Forgot (LoginView.tsx)
Cherry-picked from duckietm PR #126	UserAccountSettingsView (reset password / email / username under user settings), plus the wear-badge popup canShowWearButton gating

Not yet	Notes
Migrate the 48 useCatalog() consumers to the new filters	The split is done: pure helpers in useCatalog.helpers.ts, three filters (useCatalogData / useCatalogUiState / useCatalogActions) plus the deprecated useCatalog shim. Three pilot consumers already migrated (CatalogBuildersClubStatusView, CatalogBreadcrumbView, CatalogNavigationItemView). The remaining 45 still hit the shim — incremental work, each migration is mechanical: split the destructure into 2-3 filter calls based on which keys are read.
Split useChatWidget / useAvatarInfoWidget	Both state-driven via events with no clean imperative actions to extract — skip-motivated. Already touched today for the InfoStand listener move.
Split usePetPackageWidget / useWordQuizWidget / useChatCommandSelector	Their "actions" mutate internal state or are tightly interdependent — skip-motivated.
Hoist Wired Creator Tools shared state to a Zustand slice	Would remove ~25 props passed to the 3 tab sub-components. (Wired-tools split done as singleton-filter; Zustand slice is the next step.)
Widen the component / hook test coverage	Mock layer is in place (tests/mocks/renderer-mock.ts) and the first 2 pilots pass. Good follow-up targets: other *State hooks built on event reducers, LoginView Form Actions happy/error paths, OfferView with useNitroQuery.

Known open logic bugs

Read docs/ARCHITECTURE.md "Known logic bugs" section. The two still-open ones:

• MainView.tsx:47-48 — race between RoomSessionEvent.CREATED and ENDED (no session token guard).
• LayoutFurniImageView / LayoutAvatarImageView — async fetch race when props change twice in quick succession.

Fix shapes documented; both are reasonable PRs on their own.

House rules

• Commit author: simoleo89 <simoleo89@users.noreply.github.com>. When committing, pass these via per-command overrides (git -c user.name=simoleo89 -c user.email=...) — do NOT modify the global git config.
• No claude/... branch names — auto-generated names should be renamed before pushing. Prefer feat/<description>.
• Never merge a branch that violates the layout convention above. The feat/react19-hooks-adapter branch (deleted) put hooks under src/components/...; that's wrong and a recurring temptation.
• Skip-motivated god-hook splits are fine — when a hook's actions mutate internal state, document the reason in the commit message and move on rather than forcing a bad split.
• yarn test must stay green on every commit. Currently 163/163. The GitHub Actions workflow at .github/workflows/ci.yml runs yarn typecheck + yarn test --run on every push to main / feat/** and on every PR — both must pass.
• Lint baseline: don't regress. Some pre-existing errors (FC<{}>, IMessageEvent | undefined redundant union in the local sandbox where the renderer SDK isn't installed) are out of scope here.

Where everything lives

• Architecture doc: docs/ARCHITECTURE.md
• Test runner config: vitest.config.mts (separate from vite.config.mjs)
• Test setup: tests/setup.ts
• React Query adapter: src/api/nitro-query/createNitroQuery.ts
• Zustand factory: src/state/createNitroStore.ts
• Error boundary: src/common/error-boundary/WidgetErrorBoundary.tsx
• Event hooks (useNitroEvent, useMessageEvent, useNitroEventState, useMessageEventState): src/hooks/events/
• Wired-tools split (types/constants/helpers + 3 tab views): src/components/wired-tools/
• User account settings (cherry-picked from upstream PR #126): src/components/user-settings/UserAccountSettingsView.tsx
• Access-token persistence helper (used by login + remember + rotate): src/api/auth/accessToken.ts (persistAccessTokenFromPayload)
• Asset middleware: nitroAssetsServer() in vite.config.mjs
• Configuration pre-init: src/bootstrap.ts (await GetConfiguration().init() before import('./index'))
• Catalog pure helpers: src/hooks/catalog/useCatalog.helpers.ts (buildCatalogNodeTree, findNodeById / findNodeByName, getNodesByOfferIdFromMap, getOfferProductKeys, normalizeCatalogType, resolveBuilderFurniPlaceableStatus)
• Catalog three-way filter split: useCatalogData / useCatalogUiState / useCatalogActions (with the deprecated useCatalog shim) in src/hooks/catalog/useCatalog.ts
• Renderer-SDK mock for Vitest: tests/mocks/renderer-mock.ts (aliased over @nitrots/nitro-renderer via vitest.config.mts). Hosts the explicit NitroLogger mock, the mockEventDispatcher / clearMockEventDispatcher helpers used by hook tests, the RoomSessionDoorbellEvent stub, and a long list of placeholder classes/enums kept around just so the src/api/* barrel cascade imports without throwing. Grow this file when a new test needs a symbol; prefer real deterministic stubs over vi.fn().