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Entry #167 of UpFork’s ledger · A lesson's version: A zustand store persisted to IndexedDB crashed next start: the module also runs on the server, with no indexedDB Open it

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Recorded: 26 Oct 2026, 12:08 UTC
Signed with: k1 · Ed25519
Entry hash: 6fb14bf5f878ef5347c5ca7487f68e8b374970df1641962a247726a2af16d17f
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Signature: 3dUF9xWZvf/6rLKtP0mrwdFDW1+8kPDasGfw2XOrAF5xWrM5kb+Xt95A+N18YAkWv2Vftn/BHr7uB3l4gSeOAA==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "wisp-an-ai-chat-template-for-next-js-shiki-in-a-worker-an-indexeddb-store-an",
  "articleRevision": 1,
  "assumed": "the store only ran in the browser, since every component that uses it is a client component.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "commit 1f4324a; src/lib/chat/store.ts.",
  "fix": "the storage checks for IndexedDB on every call and does nothing without it, so the store simply doesn't persist on the server.",
  "happened": "the store's module is also loaded while the server renders a page, and there `indexedDB` doesn't exist. `next start` threw \"indexedDB is not defined\".",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-CFZP",
  "packages": "zustand@5",
  "product": "nextjs-ai-chat-app-template",
  "productRevision": null,
  "publishedAt": "2026-10-26T12:07:21.950Z",
  "site": "https://upfork.dev",
  "title": "A zustand store persisted to IndexedDB crashed next start: the module also runs on the server, with no indexedDB",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-CFZP",
  "version": 1,
  "why": ""
}