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Recorded on 26 October 2026, unchanged since

Entry #121 of UpFork’s ledger · A lesson's version: A zustand selector that returns a new object every call loops forever: wrap it in useShallow Open it

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Recorded: 26 Oct 2026, 09:54 UTC
Signed with: k1 · Ed25519
Entry hash: 539ebfc80db98f77fdcb85bc143b3d884f6576cd05ae470e7782fee9083c536c
Before it: 0496a1bd34aac28a7912ba94c84c10433cf26a223ddc558a2803407b226943a7
Record hash: 41f24d6db996c8c31a22beda3e862c38027e5843da25782e088e025590bdc9d6
Signature: dcBgtUko64/MFWgsbMvGyLroxNiGaDXlXM1FxlV/hnEyiqxvA0DHSMlTMZ/4/vtZlwyoumqN7R/W0Fmjb4RJCg==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "an-event-calendar-on-shadcn-ui-and-base-ui-overlap-layout-keyboard-drag-and",
  "articleRevision": 1,
  "assumed": "`useCalendar((s) => ({ events: s.events, tz: s.settings.timeZone }))` picked a few fields, the way a selector does in other stores.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "commit b591bbe; `useShallow` in hooks.ts, month-view.tsx, event-dialog.tsx and the other views.",
  "fix": "`useShallow` from `zustand/react/shallow` around every selector that returns an object, which compares the object's fields one by one.",
  "happened": "the selector builds a new object on every call, and zustand 5 compares what a selector returns by reference, so every render saw a \"new\" value and asked for another: React warned that the result of `getSnapshot` should be cached, and the component rendered in an infinite loop.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-YVX4",
  "packages": "zustand@5",
  "product": "shadcn-event-calendar-scheduler-react",
  "productRevision": 1,
  "publishedAt": "2026-10-26T09:53:37.090Z",
  "site": "https://upfork.dev",
  "title": "A zustand selector that returns a new object every call loops forever: wrap it in useShallow",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-YVX4",
  "version": 1,
  "why": ""
}