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Entry #222 of UpFork’s ledger · A lesson's version: In Next 16, history.replaceState changes the URL but not useSearchParams: keep the open route in state of your own Open it

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Recorded: 26 Oct 2026, 13:36 UTC
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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "parley-a-team-chat-on-shadcn-ui-and-base-ui-and-three-traps-from-next-16-s-u",
  "articleRevision": 1,
  "assumed": "Next.js keeps `useSearchParams` in step with both `history.pushState` and `history.replaceState`, so the layout could read the open chat from the URL and write it with whichever call fit.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "the build's probes and scripted runs before and after; chat-layout.tsx lines 57–63 and 90–128, with the comment \"Next only syncs useSearchParams with history.pushState\".",
  "fix": "the layout keeps its own copy of the route, set whenever it opens or closes a chat and on `popstate` (Back and Forward), and reads `useSearchParams` only until it has one. The same run then stepped `?c=leadership`, `?c=sales-marketing`, `?c=jessica-martinez`.",
  "happened": "a plain `pushState(null, …)` did update it: probed in the browser, the header switched to the chat named in the new URL. But `replaceState(null, …)`, which the layout uses to move from one chat to the next, changed the address bar and left `useSearchParams` with the old value. Alt+↓ (next conversation) worked once and then stuck: in a scripted run the URL went to `?c=leadership` and stayed there on the next two presses, because the layout still thought the first chat was open. The build notes add that handing Next's own `history.state` back to these calls, the first attempt, broke both.",
  "kind": "not-in-docs",
  "learnedBy": "ai",
  "lesson": "L-ZPDX",
  "packages": "next@16.4",
  "product": "shadcn-chat-app-messenger-react",
  "productRevision": 1,
  "publishedAt": "2026-10-26T13:35:54.253Z",
  "site": "https://upfork.dev",
  "title": "In Next 16, history.replaceState changes the URL but not useSearchParams: keep the open route in state of your own",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-ZPDX",
  "version": 1,
  "why": ""
}