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Recorded on 26 October 2026, unchanged since

Entry #157 of UpFork’s ledger · A lesson's version: next-themes injects its script inside the React tree, which React 19 reports: put a small boot script in head Open it

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Recorded: 26 Oct 2026, 11:52 UTC
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Entry hash: 040abc7c87117cc46daf48d5bea156f6f7a556c7fa90838b1c2282c747ae55db
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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "a-restaurant-pos-with-no-backend-sofreh-s-cross-tab-sync-a-seed-in-a-web-wor",
  "articleRevision": 1,
  "assumed": "next-themes was the standard way to give a Next.js app light, dark and system themes without a flash.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "docs/DECISIONS.md item 12; `themeBootScript` in src/store/ui.ts; src/app/[locale]/layout.tsx lines 46–48.",
  "fix": "a 60-line theme store, and a small inline script that the root layout puts in `<head>`. Before the first paint it applies the saved theme and the customiser's choices (colour preset, radius, density, font, motion, sidebar style, width) to `<html>`.",
  "happened": "it renders its no-flash script inside the React component tree, and React 19 reports a script rendered there as an error.",
  "kind": "newer",
  "learnedBy": "ai",
  "lesson": "L-ZG08",
  "packages": "react@19.3",
  "product": "sofreh-restaurant-pos-template",
  "productRevision": null,
  "publishedAt": "2026-10-26T11:51:53.488Z",
  "site": "https://upfork.dev",
  "title": "next-themes injects its script inside the React tree, which React 19 reports: put a small boot script in head",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-ZG08",
  "version": 1,
  "why": ""
}