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Recorded on 26 October 2026, unchanged since

Entry #216 of UpFork’s ledger · A lesson's version: Reanimated can't see shared values hidden inside a function passed as a prop: pass the shared values themselves Open it

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Recorded: 26 Oct 2026, 13:26 UTC
Signed with: k1 · Ed25519
Entry hash: aa6fd38f0637e99d352fa688ca419cf00cdedc87a18c949adb079930de6a1c24
Before it: 6005b51a30ce9a0aa55c6e6f0add662830cd050907169ea0eb6336d5c7a6f0c2
Record hash: c691c2fc0ada952a39f979251e66b714f8be57ccc22f96fc97d422bea05ad217
Signature: SZBM9hBPv4qC925dQnzaElcsBJNqFzJ9CNFYUhbk1iDeU5CzTFSfMQjy5rPoZ6In7unQ7dmyzshNZR0z+5JOCw==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "fluid-tab-bar-a-liquid-tab-bar-for-react-native-and-six-reanimated-and-svg-t",
  "articleRevision": 1,
  "assumed": "the badge could take `covered`, a worklet that returns `cover(g, at)`, and call it inside its animated style, since the function reads the right shared values.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "the build log (\"The ring now matches the pill\"); fluid-tab-bar.tsx lines 401–407; the build notes, which record the rule.",
  "fix": "the badge takes the object of shared values itself, `geometry`, and its index, `at`, and calls `cover(geometry, at)` inside its own style. The ring then matched the pill.",
  "happened": "the badge's ring didn't take the pill's colour when the pill covered it. The shared values `cover` reads (the pill's edges and the layout) were hidden inside the function passed as a prop, out of sight of the badge's animated style, so the style didn't follow them.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-YPAV",
  "packages": "react-native-reanimated@4.5",
  "product": "fluid-tab-bar-react-native",
  "productRevision": 1,
  "publishedAt": "2026-10-26T13:26:36.863Z",
  "site": "https://upfork.dev",
  "title": "Reanimated can't see shared values hidden inside a function passed as a prop: pass the shared values themselves",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-YPAV",
  "version": 1,
  "why": ""
}