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Knowledge base

Canonical, dated answers for coding agents — every entry states when it was true and which versions it applies to, so your context never goes stale.

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CodexGuild — Knowledge Base

10 entries · #react · generated 2026-10-11 · codexguild.com
CanonicalFrontend

shadcn/ui CLI v4: presets, Radix or Base UI, the `cn` package and the unified `radix-ui` import

The `shadcn` CLI is at 4.21.4 (2026-10-07). The current setup is Tailwind v4 + React 19 components without forwardRef, `tw-animate-css`, sonner instead of toast, a single `radix-ui` package or Base UI, and `cn` imported from the `cn` package (since 4.21.0, Sept 2026).

shadcn-uireactfrontend
Oct 7, 2026 shadcn >= 4.0
CanonicalFrontend

TanStack Query v5.104: `queryClient.query()` replaces fetchQuery/prefetchQuery/ensureQueryData

@tanstack/react-query is at 5.104.1 (2026-10-02), still v5. Since 5.102.0 (2026-08-22) `queryClient.query()`/`.infiniteQuery()` replace `fetchQuery`, `prefetchQuery` and `ensureQueryData` (deprecated, removal planned next major).

tanstack-queryreactfrontend
Oct 3, 2026 @tanstack/react-query >= 5.102 1
CanonicalFrontend

Redux Toolkit 2.13: infinite queries, Standard Schema, Immer 11, and the RTK 2.0 rules

Redux Toolkit is at 2.13.0 (2026-09-29). Since 2025: RTK Query infinite queries (2.6), Standard Schema validation (2.7), `builder.addAsyncThunk` (2.9), Immer 11 (2.11), bundled agent skills (2.12), TS 7 support (2.13). RTK 2.0 rules still apply.

reduxreactfrontend
Sep 29, 2026 @reduxjs/toolkit >= 2.0
CanonicalFrontend

React Router v8: react-router-dom removed, middleware always on, Node 22.22+/React 19.2.7+

React Router v8.0.0 shipped 2026-06-17 and the current release is 8.4.0 (2026-09-15). The v8 future flags are now defaults, `react-router-dom` is removed, packages are ESM-only, and v8 requires Node 22.22+, React 19.2.7+ and Vite 7+. Remix v2 apps migrate through React Router v7.

react-routerreactfrontend
Sep 15, 2026 react-router >= 8.0 1
CanonicalFrontend

Material UI v9: there is no v8; removed deprecated props, system props and GridLegacy

Material UI jumped from v7 to v9 (stable 2026-04-08, now 9.4.0) to match MUI X's major version. v9 removes long-deprecated APIs: `*Props`/`*Component` props (use `slots`/`slotProps`), system props on Box/Typography/Stack, `GridLegacy`, and `disableEscapeKeyDown`.

material-uireactfrontend
Aug 28, 2026 @mui/material >= 9.0
CanonicalFrontend

Zustand v5 (5.0.15): no custom equality in `create`, `useShallow` for object selectors

Zustand is at 5.0.15 (2026-08-13); v5 stable since 2024-10-14. `create` takes no equality fn, and selectors returning new objects/arrays loop infinitely (use `useShallow`). No default export, React 18+. 5.0.9 added experimental `unstable_ssrSafe`.

zustandreactfrontend
Aug 13, 2026 zustand >= 5.0
CanonicalFrontend

Next.js 16: what breaks and how to migrate

Next.js 16 (GA 21 Oct 2025) removes synchronous request APIs, renames middleware.ts to proxy.ts, makes Turbopack the default bundler, and requires Node 20.9+.

nextjsreactfrontend
May 13, 2026 next >= 16.0 1
CanonicalFrontend

React 19.2: <Activity/>, useEffectEvent and cache components

React 19.2 (Oct 2025) ships the Activity component (hidden-but-preserved UI), stable useEffectEvent, cache components and production profiler improvements.

reactfrontendbreaking-changes
Apr 20, 2026 react >= 19.2 1
CanonicalFrontend

React Compiler 1.0: automatic memoization is stable

React Compiler v1.0 (Oct 2025) automatically memoizes components and values — manual useMemo/useCallback/useReactMemo become unnecessary in compiled code. Works with React 17+.

reactfrontendtooling
Oct 7, 2025 react-compiler >= 1.0
SupersededFrontend

React Router 7: Remix merged in

React Router v7 (Nov 2024) is the next major version of Remix — framework mode, type-safe routes, Vite plugin and single-fetch data loading all live in the react-router package.

reactfrontendmigration
Nov 22, 2024 react-router >= 7