Claude Skills by melau-eddy

Use this when setting up a new Redux Toolkit app or modernizing an existing React + Redux codebase. Covers configureStore, Provider wiring, typed hooks, hooks-first React-Redux usage, feature folders, and the correct store lifetime for SPA and SSR-heavy React environments.

Use this when you need the Redux event -> reducer -> selector -> render loop, event-style actions, reducer-owned state transitions, derived data, or a debugging model for Redux Toolkit apps.

Use this when debugging duplicate requests, stale cache behavior, broad subscriptions, selector churn, serializability warnings, or other Redux Toolkit and RTK Query bugs. Covers a practical event -> reducer -> selector -> render debugging loop plus RTK Query cache interpretation.

Use this when moving a legacy Redux codebase to current RTK patterns. Covers replacing createStore with configureStore, migrating touched reducers to createSlice, codemod-assisted RTK 2 updates, and replacing server-data stacks with RTK Query instead of writing new legacy Redux code.

Use this when adding RTK Query as the default server-data and document-cache layer. Covers createApi, store integration, hooks, invalidation behavior, optimistic updates, and deciding when RTK Query is the right cache model.

Use this when authoring or refactoring slices with createSlice, selectors, create.asyncThunk, entity adapters, or lazy reducer injection. Covers Immer-backed mutation syntax, slice selectors, getSelectors, injectInto, withLazyLoadedSlices, and current RTK 2 slice patterns.

Use this when deciding whether data belongs in Redux, component state, router state, or another external source. Covers state ownership, authority boundaries, slice sizing, and when to move or split data as the app evolves.

Use this when choosing between RTK Query, createAsyncThunk, handwritten thunks, and createListenerMiddleware. Covers imperative versus reactive workflows, listener middleware setup, and keeping side effects out of reducers and UI components.

Step-by-step migration from Next.js App Router to TanStack Start: route definition conversion, API mapping, server function conversion from Server Actions, middleware conversion, data fetching pattern changes.

React bindings for TanStack Start: createStart, StartClient, StartServer, React-specific imports, re-exports from @tanstack/react-router, full project setup with React, useServerFn hook.

Implement, review, debug, and refactor TanStack Start React Server Components in React 19 apps. Use when tasks mention @tanstack/react-start/rsc, renderServerComponent, createCompositeComponent, CompositeComponent, renderToReadableStream, createFromReadableStream, createFromFetch, Composite Components, React Flight streams, loader or query owned RSC caching, router.invalidate, structuralSharing: false, selective SSR, stale names like renderRsc or .validator, or migration from Next App Router ...

Framework-agnostic core concepts for TanStack Router: route trees, createRouter, createRoute, createRootRoute, createRootRouteWithContext, addChildren, Register type declaration, route matching, route sorting, file naming conventions. Entry point for all router skills.

Route protection with beforeLoad, redirect()/throw redirect(), isRedirect helper, authenticated layout routes (_authenticated), non-redirect auth (inline login), RBAC with roles and permissions, auth provider integration (Auth0, Clerk, Supabase), router context for auth state.

Automatic code splitting (autoCodeSplitting), .lazy.tsx convention, createLazyFileRoute, createLazyRoute, lazyRouteComponent, getRouteApi for typed hooks in split files, codeSplitGroupings per-route override, splitBehavior programmatic config, critical vs non-critical properties.

Route loader option, loaderDeps for cache keys, staleTime/gcTime/ defaultPreloadStaleTime SWR caching, pendingComponent/pendingMs/ pendingMinMs, errorComponent/onError/onCatch, beforeLoad, router context and createRootRouteWithContext DI pattern, router.invalidate, Await component, deferred data loading with unawaited promises.

Link component, useNavigate, Navigate component, router.navigate, ToOptions/NavigateOptions/LinkOptions, from/to relative navigation, activeOptions/activeProps, preloading (intent/viewport/render), preloadDelay, navigation blocking (useBlocker, Block), createLink, linkOptions helper, scroll restoration, MatchRoute.

notFound() function, notFoundComponent, defaultNotFoundComponent, notFoundMode (fuzzy/root), errorComponent, CatchBoundary, CatchNotFound, isNotFound, NotFoundRoute (deprecated), route masking (mask option, createRouteMask, unmaskOnReload).

Dynamic path segments ($paramName), splat routes ($ / _splat), optional params ({-$paramName}), prefix/suffix patterns ({$param}.ext), useParams, params.parse/stringify, pathParamsAllowedCharacters, i18n locale patterns.

validateSearch, search param validation with Zod/Valibot/ArkType adapters, fallback(), search middlewares (retainSearchParams, stripSearchParams), custom serialization (parseSearch, stringifySearch), search param inheritance, loaderDeps for cache keys, reading and writing search params.

Non-streaming and streaming SSR, RouterClient/RouterServer, renderRouterToString/renderRouterToStream, createRequestHandler, defaultRenderHandler/defaultStreamHandler, HeadContent/Scripts components, head route option (meta/links/styles/scripts), ScriptOnce, automatic loader dehydration/hydration, memory history on server, data serialization, document head management.

Full type inference philosophy (never cast, never annotate inferred values), Register module declaration, from narrowing on hooks and Link, strict:false for shared components, getRouteApi for code-split typed access, addChildren with object syntax for TS perf, LinkProps and ValidateLinkOptions type utilities, as const satisfies pattern.

TanStack Router bundler plugin for route generation and automatic code splitting. Supports Vite, Webpack, Rspack, and esbuild. Configures autoCodeSplitting, routesDirectory, target framework, and code split groupings.

Core overview for TanStack Start: tanstackStart() Vite plugin, getRouter() factory, root route document shell (HeadContent, Scripts, Outlet), client/server entry points, routeTree.gen.ts, tsconfig configuration. Entry point for all Start skills.

Server-side authentication primitives for TanStack Start: session cookies (HttpOnly, Secure, SameSite, __Host- prefix), session read/issue/destroy via createServerFn and middleware, OAuth authorization-code flow with state and PKCE, password-reset enumeration defense, CSRF for non-GET RPCs, rate limiting auth endpoints, session rotation on privilege change. Pairs with router-core/auth-and-guards for the routing side.

Deploy to Cloudflare Workers, Netlify, Vercel, Node.js/Docker, Bun, Railway. Selective SSR (ssr option per route), SPA mode, static prerendering, ISR with Cache-Control headers, SEO and head management.

Isomorphic-by-default principle, environment boundary functions (createServerFn, createServerOnlyFn, createClientOnlyFn, createIsomorphicFn), ClientOnly component, useHydrated hook, import protection, dead code elimination, environment variable safety (VITE_ prefix, process.env).

createMiddleware, request middleware (.server only), server function middleware (.client + .server), context passing via next({ context }), sendContext for client-server transfer, global middleware via createStart in src/start.ts, middleware factories, method order enforcement, fetch override precedence.

createServerFn (GET/POST), validator (Zod or function), useServerFn hook, server context utilities (getRequest, getRequestHeader, setResponseHeader, setResponseStatus), error handling (throw errors, redirect, notFound), streaming, FormData handling, file organization (.functions.ts, .server.ts).

Server-side API endpoints using the server property on createFileRoute, HTTP method handlers (GET, POST, PUT, DELETE), createHandlers for per-handler middleware, handler context (request, params, context), request body parsing, response helpers, file naming for API routes.

Server-side runtime for TanStack Start: createStartHandler, request/response utilities (getRequest, setResponseHeader, setCookie, getCookie, useSession), three-phase request handling, AsyncLocalStorage context.

Programmatic route tree building as an alternative to filesystem conventions: rootRoute, index, route, layout, physical, defineVirtualSubtreeConfig. Use with TanStack Router plugin's virtualRouteConfig option.