Cleared 4 rule buckets (37 violations, including 5 real bugs) and
silenced 1 informational bucket from the Next 16 / react-hooks v7
upgrade. Cleared rules promoted from `warn` back to `error` so new
regressions block CI.
Real bug fixes:
- `interest-contact-log-tab.tsx`: `useMemo` used for side effects
(5 setState calls inside a memo body); converted to `useEffect`.
- `PieChart.tsx`: cumulative `let angle` mutation in a render-phase
`map`; converted to `reduce` so the slice array is built without
re-assignment.
- `documents-hub.tsx`: `useMemo(() => ({ count: 0 }))` used as a
mutable drag counter; converted to `useRef`.
- `notes-list.tsx`: `Date.now()` read during render for note-edit
countdown (impure) → pinned to a `now` state ticked every 30s.
- `onboarding-checklist.tsx` / `user-profile.tsx` /
`user-settings.tsx`: `useEffect(() => void load(), [])` with the
`load` function declared AFTER the effect — relied on hoisting,
trips Compiler's "access before declared" rule. Declared inside
the effect.
Pattern fixes (intentional cache-via-ref → state or layout-effect):
- 6 `ref.current = x` writes during render moved into layout
effects (`use-realtime-invalidation`, `settings-form-card`,
`inbox`).
- 3 `ref.current` reads during render (search totals cache,
scanner file ref) rewritten to backed-by-state.
- `use-is-mobile.ts` rewritten on `useSyncExternalStore` to avoid
the SSR-then-rehydrate setState dance.
- `use-notifications.ts` rewritten to write socket pushes directly
into the React Query cache via `setQueryData`, removing a local
state mirror.
Rule config (`eslint.config.mjs`):
- `react-hooks/purity` → error (was warn, cleared)
- `react-hooks/set-state-in-render` → error (was warn, cleared)
- `react-hooks/immutability` → error (was warn, cleared)
- `react-hooks/refs` → error (was warn, cleared)
- `react-hooks/incompatible-library` → off (informational only)
- `react-hooks/set-state-in-effect` → warn (51 remaining, all the
useEffect→fetch→setState data-fetch pattern; migration to
useQuery tracked in BACKLOG)
Verified: tsc clean, eslint 0 errors / 69 warnings (down from 105),
vitest 1315/1315, next build green.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Applied @next/codemod migrations:
- middleware-to-proxy: src/middleware.ts → src/proxy.ts + function rename
- remove-experimental-ppr: no hits
- remove-unstable-prefix: no hits
tsconfig.json picked up Next 16's autofixes:
- jsx: 'preserve' → 'react-jsx'
- include .next/dev/types/**/*.ts (dev-mode route types)
- next-env.d.ts: triple-slash reference → ES import (TS 6 / Next 16 style)
eslint-config-next@16 ships a native flat config, so dropped the
@eslint/eslintrc + FlatCompat shim. eslint.config.mjs now imports
eslint-config-next/core-web-vitals + eslint-config-prettier/flat
directly.
Note on ESLint 10: bumped + reverted. eslint-config-next@16 still
has a transitive eslint-plugin-react@7 that uses the eslint-9
context API (getFilename on context); breaks under eslint 10.
Audit anticipated lockstep — but the transitive isn't ready yet.
Holding at eslint 9.x until upstream lands. Tracked in BACKLOG.
React Compiler safety rules (react-hooks v7) shipped with config-
next 16 surfaced ~89 legitimate findings (set-state-in-effect,
ref-during-render, immutability). Demoted the new rules to `warn`
so the codebase isn't blocked; triage tracked in BACKLOG §G.
Verified: tsc 0 errors, eslint 0 errors / 105 warnings (89 new
Compiler-rule warns + 16 pre-existing), next build clean, custom
server build clean, vitest 1315/1315.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
`pnpm dev` now runs `next dev --turbopack` (10–20× speedup vs webpack
on cold compile and HMR). Promote `typedRoutes` out of `experimental`
to match Next 15.5's stable surface; auto-update `next-env.d.ts` to
reference the generated routes.d.ts. Ignore that file in eslint since
Next regenerates it and the triple-slash style is fixed by the
framework.
`next.config.ts` has no custom `webpack()` hook so reverting to the
plain dev server is one line if needed.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
