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build(frontend): React 18 -> 19 with the React Compiler (E27 S1)

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The compiler auto-memoises, which is the point: it infers what the app's
112 `useCallback` and 48 `useMemo` call sites were hand-written for and
applies the equivalent itself. It is on repo-wide with no opt-out list —
it bails on anything it cannot prove safe, and says so through the lint
rules. Verified in the built bundle rather than assumed: 369
`react.memo_cache_sentinel` markers across 35 of the 76 chunks.

ONE transform, shared by vite.config.ts and vitest.config.ts through
reactPlugin.ts. Not two `react()` calls: if the compiler ran only in the
production build, every vitest run would exercise code the user never
receives and a compiler-induced change would ship green — the same
gate-vs-image split 0.93.2 was released to fix. The plugin is imported
rather than named by the usual string, because a string is invisible to
knip and, worse, a typo in it is a silent no-op that ships an uncompiled
bundle, while a bad import is a tsc error.

eslint-plugin-react-hooks 5 -> 7 brings the whole compiler rule set: 283
findings, triaged rather than bulk-suppressed, because the two halves
needed different answers.

  react-hooks/refs (217) is OFF. 153 of those 217 are this app's popover
  architecture, not its history: 79 are @floating-ui/react's documented
  `pop.refs.setReference` / `getReferenceProps` callback-ref setters, and
  74 more are passing the popover handle down as a prop, which is what
  components/ui's popover engine is for. Suppressing them would not help
  the next popover anyone writes. The remaining ~64 are genuine
  render-phase `ref.current = x` writes and are real, but the rule cannot
  tell them apart here; they are E27 S2's work.

  The other 66 go into eslint-suppressions.json as a ratchet — new
  violations fail the gate, and `--prune-suppressions` makes a fixed one
  fail too until it is removed. 45 of them are `set-state-in-effect`,
  which IS E27 S2's subject, so that sprint now has a measured worklist.

react-i18next deliberately stays on 14. It never declared a React-19
peer — every version from 14 to 17 asks only for `react >= 16.8.0` — and
what the newer lines actually require is i18next 25/26 against our 23.
That is an i18n runtime migration wearing a React hat, and it buys this
sprint nothing.

Two React 19 type changes: `useRef<T>(null)` is now `RefObject<T | null>`
(the honest shape — the element is null until it mounts), so
PlexPlayerSettings' prop follows; and reactPlugin.ts joins
tsconfig.node.json's include.

The compiler skips memoising VirtualGrid and reports it: TanStack
Virtual's `useVirtualizer()` returns functions that cannot be memoised
without going stale. That is the right trade for a component whose cost
is its row window, and it is the one such site in the app, so it carries
a targeted disable with the reason — a second incompatible library
anywhere else must still stop the gate.

Nine lanes green, vitest 1558. Browser UAT on the dev server against the
still-running React 18 build as a control: boot, feed (virtualized grid,
popover menu, a filter change that moved the list 195,187 -> 64 items
with the URL mirrored, so no stale memoised UI), command palette, player
modal — no console errors on any of it.
This commit is contained in:
peter
2026-09-20 23:21:08 +02:00
parent cc9fc3b544
commit 7d682c90d5
10 changed files with 409 additions and 67 deletions
Download Patch File Download Diff File Expand all files Collapse all files
frontend/package-lock.json
Generated
+78 -56
View File
@@ -18,8 +18,8 @@
"hls.js": "^1.6.16",
"i18next": "^23.11.5",
"lucide-react": "^0.408.0",
"react": "^18.3.1",
"react-dom": "^18.3.1",
"react": "19.3.0",
"react-dom": "19.3.0",
"react-i18next": "^14.1.2"
},
"devDependencies": {
@@ -28,12 +28,13 @@
"@tailwindcss/postcss": "^4.3.3",
"@testing-library/react": "^16.3.2",
"@types/node": "^24.13.6",
"@types/react": "^18.3.3",
"@types/react-dom": "^18.3.0",
"@types/react": "19.3.0",
"@types/react-dom": "19.3.0",
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"babel-plugin-react-compiler": "1.0.0",
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"eslint-plugin-react-hooks": "7.1.1",
"eslint-plugin-react-refresh": "0.4.24",
"globals": "16.5.0",
"jsdom": "^25.0.1",
@@ -2922,32 +2923,24 @@
"undici-types": "~7.18.0"
}
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"dev": true,
"license": "MIT"
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"dev": true,
"license": "MIT",
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}
},
"node_modules/@typescript-eslint/eslint-plugin": {
@@ -3469,6 +3462,16 @@
"dev": true,
"license": "MIT"
},
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"dependencies": {
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}
},
"node_modules/balanced-match": {
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@@ -4084,16 +4087,23 @@
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"dev": true,
"license": "MIT",
"dependencies": {
"@babel/core": "^7.24.4",
"@babel/parser": "^7.24.4",
"hermes-parser": "^0.25.1",
"zod": "^3.25.0 || ^4.0.0",
"zod-validation-error": "^3.5.0 || ^4.0.0"
},
"engines": {
"node": ">=10"
"node": ">=18"
},
"peerDependencies": {
"eslint": "^3.0.0 || ^4.0.0 || ^5.0.0 || ^6.0.0 || ^7.0.0 || ^8.0.0-0 || ^9.0.0"
"eslint": "^3.0.0 || ^4.0.0 || ^5.0.0 || ^6.0.0 || ^7.0.0 || ^8.0.0-0 || ^9.0.0 || ^10.0.0"
}
},
"node_modules/eslint-plugin-react-refresh": {
@@ -4586,6 +4596,23 @@
"node": ">= 0.4"
}
},
"node_modules/hermes-estree": {
"version": "0.25.1",
"resolved": "https://registry.npmjs.org/hermes-estree/-/hermes-estree-0.25.1.tgz",
"integrity": "sha512-0wUoCcLp+5Ev5pDW2OriHC2MJCbwLwuRx+gAqMTOkGKJJiBCLjtrvy4PWUGn6MIVefecRpzoOZ/UV6iGdOr+Cw==",
"dev": true,
"license": "MIT"
},
"node_modules/hermes-parser": {
"version": "0.25.1",
"resolved": "https://registry.npmjs.org/hermes-parser/-/hermes-parser-0.25.1.tgz",
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"dev": true,
"license": "MIT",
"dependencies": {
"hermes-estree": "0.25.1"
}
},
"node_modules/hls.js": {
"version": "1.6.16",
"resolved": "https://registry.npmjs.org/hls.js/-/hls.js-1.6.16.tgz",
@@ -4776,6 +4803,7 @@
"version": "4.0.0",
"resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
"integrity": "sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==",
"dev": true,
"license": "MIT"
},
"node_modules/js-yaml": {
@@ -5279,18 +5307,6 @@
"dev": true,
"license": "MIT"
},
"node_modules/loose-envify": {
"version": "1.4.0",
"resolved": "https://registry.npmjs.org/loose-envify/-/loose-envify-1.4.0.tgz",
"integrity": "sha512-lyuxPGr/Wfhrlem2CL/UcnUc1zcqKAImBDzukY7Y5F/yQiNdko6+fRLevlw1HgMySw7f611UIY408EtxRSoK3Q==",
"license": "MIT",
"dependencies": {
"js-tokens": "^3.0.0 || ^4.0.0"
},
"bin": {
"loose-envify": "cli.js"
}
},
"node_modules/loupe": {
"version": "3.2.1",
"resolved": "https://registry.npmjs.org/loupe/-/loupe-3.2.1.tgz",
@@ -5824,28 +5840,24 @@
"license": "MIT"
},
"node_modules/react": {
"version": "18.3.1",
"resolved": "https://registry.npmjs.org/react/-/react-18.3.1.tgz",
"integrity": "sha512-wS+hAgJShR0KhEvPJArfuPVN1+Hz1t0Y6n5jLrGQbkb4urgPE/0Rve+1kMB1v/oWgHgm4WIcV+i7F2pTVj+2iQ==",
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"resolved": "https://registry.npmjs.org/react/-/react-19.3.0.tgz",
"integrity": "sha512-E8LUcbtBWt20bbl2YoHfx4ZDBdxVTfOKtCZn9cDSJ4l6/nuoApcpIBcj47t2wZoVX8g2ZHuMHbiShgCR1T5Sog==",
"license": "MIT",
"dependencies": {
"loose-envify": "^1.1.0"
},
"engines": {
"node": ">=0.10.0"
}
},
"node_modules/react-dom": {
"version": "18.3.1",
"resolved": "https://registry.npmjs.org/react-dom/-/react-dom-18.3.1.tgz",
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"license": "MIT",
"dependencies": {
"loose-envify": "^1.1.0",
"scheduler": "^0.23.2"
"scheduler": "^0.28.0"
},
"peerDependencies": {
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"react": "^19.3.0"
}
},
"node_modules/react-i18next": {
@@ -6016,13 +6028,10 @@
}
},
"node_modules/scheduler": {
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"license": "MIT",
"dependencies": {
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}
"version": "0.28.0",
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"license": "MIT"
},
"node_modules/semver": {
"version": "6.3.1",
@@ -6836,6 +6845,19 @@
"funding": {
"url": "https://github.com/sponsors/colinhacks"
}
},
"node_modules/zod-validation-error": {
"version": "4.0.2",
"resolved": "https://registry.npmjs.org/zod-validation-error/-/zod-validation-error-4.0.2.tgz",
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"dev": true,
"license": "MIT",
"engines": {
"node": ">=18.0.0"
},
"peerDependencies": {
"zod": "^3.25.0 || ^4.0.0"
}
}
}
}