fix: Invalid shared value access displaying when code is correct#6631
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fix: Invalid shared value access displaying when code is correct#6631
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MatiPl01
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Oct 25, 2024
tjzel
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Oct 25, 2024
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Nov 25, 2024
## Summary
The problem was caused by our `useDerivedValue` hook which set ref to
`null` in the `useEffect` cleanup method.
```tsx
useEffect(() => {
return () => {
initRef.current = null;
};
}, []);
```
The warning was shown during hot reload, because react calls cleanup
functions in hooks, thus the `initRef` was reset in the
`useDerivedValue` hook, which resulted in execution of this code that
should run only when the component mounts for the first time:
```tsx
if (initRef.current === null) {
initRef.current = makeMutable(initialUpdaterRun(updater));
}
```
Because of that, `initialUpdaterRun` executed the `updater` callback on
the JS thread during hot reload, while the component was rendered, which
resulted in reading shared value's `.value` property during the render
phase.
Merged
tjzel
pushed a commit
that referenced
this pull request
Nov 26, 2024
## Summary
The problem was caused by our `useDerivedValue` hook which set ref to
`null` in the `useEffect` cleanup method.
```tsx
useEffect(() => {
return () => {
initRef.current = null;
};
}, []);
```
The warning was shown during hot reload, because react calls cleanup
functions in hooks, thus the `initRef` was reset in the
`useDerivedValue` hook, which resulted in execution of this code that
should run only when the component mounts for the first time:
```tsx
if (initRef.current === null) {
initRef.current = makeMutable(initialUpdaterRun(updater));
}
```
Because of that, `initialUpdaterRun` executed the `updater` callback on
the JS thread during hot reload, while the component was rendered, which
resulted in reading shared value's `.value` property during the render
phase.
r0h0gg6
pushed a commit
to r0h0gg6/react-native-reanimated
that referenced
this pull request
Jul 28, 2025
…tware-mansion#6631) ## Summary The problem was caused by our `useDerivedValue` hook which set ref to `null` in the `useEffect` cleanup method. ```tsx useEffect(() => { return () => { initRef.current = null; }; }, []); ``` The warning was shown during hot reload, because react calls cleanup functions in hooks, thus the `initRef` was reset in the `useDerivedValue` hook, which resulted in execution of this code that should run only when the component mounts for the first time: ```tsx if (initRef.current === null) { initRef.current = makeMutable(initialUpdaterRun(updater)); } ``` Because of that, `initialUpdaterRun` executed the `updater` callback on the JS thread during hot reload, while the component was rendered, which resulted in reading shared value's `.value` property during the render phase.
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Summary
The problem was caused by our
useDerivedValuehook which set ref tonullin theuseEffectcleanup method.The warning was shown during hot reload, because react calls cleanup functions in hooks, thus the
initRefwas reset in theuseDerivedValuehook, which resulted in execution of this code that should run only when the component mounts for the first time:Because of that,
initialUpdaterRunexecuted theupdatercallback on the JS thread during hot reload, while the component was rendered, which resulted in reading shared value's.valueproperty during the render phase.