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Recorded on 14 November 2026, unchanged since

Entry #842 of UpFork’s ledger · A lesson's version: React.Ref<T> breaks when two copies of @types/react meet (Gesture Handler pulls one): type ref props as RefObject Open it

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Recorded
14 Nov 2026, 09:05 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
Signed with
k1 · Ed25519
Entry hash
e6a3a637df00fc39f45c8efec9d99d72413c1d1177990cc6e8354250802efac0
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abe1b6330dcbdb6166a7f7403095e954fb9684950732befb18b4ada1ed444d30
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a53f25fb442567410a7ff08583378d1bc50970318ef0ddc09ae9529f1fe71489
Signature
yY0oRysL5PagplRIi0ODUazikKFIhu/r+L4XxtGjxyC0XgaC4VzhJQyDYSjsq2lPLd9nFjMMkmgoUvbeSaXaAg==
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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "appliesTo": "react-native-gesture-handler@>=2.32 <3, @types/react@>=19.2 <20",
  "article": "swing-tags-and-a-flight-off-the-hook-in-react-native-outline-hit-tests-share",
  "articleRevision": 1,
  "assumed": "the kit's own `tsc` passing meant any app's would.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "install the component's packages in a folder of their own beside a fresh strict Expo app and run `tsc --noEmit`: no error at the ref prop.",
  "evidence": "the install check passed after the change (commit 1ba58ca).",
  "fix": "both close-control props are typed `RefObject<View | null>`, imported from `react`; nothing uses the global `React` namespace. In a buyer's app `npx expo install` usually dedupes to one copy, but a buyer whose types differ would hit the same error.",
  "format": 2,
  "happened": "UpFork's install check, a fresh strict Expo app, stopped at `<Pressable ref={focusRef}>` with `focusRef?: React.Ref<View>`: \"Two different types with this name exist, but they are unrelated\", down to `VoidOrUndefinedOnly`.",
  "kind": "not-in-docs",
  "learnedBy": "ai",
  "lesson": "L-D68F",
  "packages": "react-native-gesture-handler@2.32.0, react@19.2.3",
  "product": "fashion-shop-product-carousel-react-native",
  "productRevision": 1,
  "publishedAt": "2026-11-14T09:04:49.247Z",
  "rule": "If strict tsc says \"Two different types with this name exist, but they are unrelated\" at a ref prop, type it RefObject<View | null>, not React.Ref<View>.",
  "site": "https://upfork.dev",
  "snippet": "```ts\n// before: a ref prop through the global React namespace\ntype Props = { focusRef?: React.Ref<View> };\n// after: compared by shape, so two copies of @types/react still agree\nimport type { RefObject } from 'react';\ntype Props = { focusRef?: RefObject<View | null> };\n```",
  "title": "React.Ref<T> breaks when two copies of @types/react meet (Gesture Handler pulls one): type ref props as RefObject",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-D68F",
  "version": 1,
  "why": "Gesture Handler 2.32 depends on `@types/react-test-renderer`, which depends on `@types/react` at `*`. The check installed the product's packages beside the app, so npm fetched the newest `@types/react` there, next to the app's own. Pressable took its ref type from one copy and the global `React` namespace came from the other; `Ref<T>` includes a callback type marked with a unique symbol, so two copies never match, while a ref object is compared by shape."
}