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Recorded on 26 October 2026, unchanged since

Entry #158 of UpFork’s ledger · A lesson's version: A demo page that throws on purpose fails next build when it throws while prerendering: throw only in the browser Open it

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Recorded: 26 Oct 2026, 11:52 UTC
Signed with: k1 · Ed25519
Entry hash: b79fbb459b7cc2643081493d1706ddd63c101fe7895379afc76318db9f97bb80
Before it: 040abc7c87117cc46daf48d5bea156f6f7a556c7fa90838b1c2282c747ae55db
Record hash: de0a7dff513adf1367b29c433a6813316531badab5740023ddbff2c55c999c2d
Signature: yxmcpojHx8RSKdY1xynbGu/USkLgY6Vlo8jfRPOm8G5RW9E6yn43E/otbKiE9te7C2/pm1nyyBfMwUGQ8x49Ag==

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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": "a component that simply throws was enough to show the segment's error boundary in action.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "src/features/system/errors-index.tsx lines 57–62.",
  "fix": "the component throws only once it's in the browser. `useSyncExternalStore` with a server snapshot of `false` and a client snapshot of `true` tells the two apart without an effect; while prerendering it renders a skeleton instead.",
  "happened": "`next build` prerenders the page, and a throw during prerendering doesn't show a boundary: it fails the build.",
  "kind": "not-in-docs",
  "learnedBy": "ai",
  "lesson": "L-GWPX",
  "packages": "",
  "product": "sofreh-restaurant-pos-template",
  "productRevision": null,
  "publishedAt": "2026-10-26T11:51:53.488Z",
  "site": "https://upfork.dev",
  "title": "A demo page that throws on purpose fails next build when it throws while prerendering: throw only in the browser",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-GWPX",
  "version": 1,
  "why": ""
}