`@preact/signals-react` 1.3.6 is brokes useSyncExternalStoreWithSelector

[XantreDev]

I am using @tanstack/react-router which using useSyncExternalStoreWithSelector i've worked with this combo for week, but yesterday it started to throw inside react internals. I has really long research and fixed this issue by downgrading to 1.2.2 where was no react internals patching. I dont really know how to reproduce this issue, maybe it's because signals uses sync external store too

react-dom.development.js:16249 Uncaught TypeError: Cannot read properties of undefined (reading 'length')
    at areHookInputsEqual (react-dom.development.js:16249:38)
    at updateMemo (react-dom.development.js:17240:11)
    at Object.useMemo (react-dom.development.js:17886:16)
    at useMemo (react.development.js:1650:21)
    at useSyncExternalStoreWithSelector (with-selector.development.js:64:18)
    at useStore (index.tsx:17:17)
    at useRouterState (react.tsx:568:10)
    at useMatch (react.tsx:673:24)
    at useSearch (react.tsx:802:10)
    at _Task (Task.tsx:23:57)
areHookInputsEqual @ react-dom.development.js:16249
updateMemo @ react-dom.development.js:17240
useMemo @ react-dom.development.js:17886
useMemo @ react.development.js:1650
useSyncExternalStoreWithSelector @ with-selector.development.js:64
useStore @ index.tsx:17
useRouterState @ react.tsx:568
useMatch @ react.tsx:673
useSearch @ react.tsx:802
_Task @ Task.tsx:23
renderWithHooks @ react-dom.development.js:16305
updateFunctionComponent @ react-dom.development.js:19588
updateSimpleMemoComponent @ react-dom.development.js:19425
beginWork @ react-dom.development.js:21678
callCallback2 @ react-dom.development.js:4164
invokeGuardedCallbackDev @ react-dom.development.js:4213
invokeGuardedCallback @ react-dom.development.js:4277
beginWork$1 @ react-dom.development.js:27451
performUnitOfWork @ react-dom.development.js:26557
workLoopSync @ react-dom.development.js:26466
renderRootSync @ react-dom.development.js:26434
performSyncWorkOnRoot @ react-dom.development.js:26085
flushSyncCallbacks @ react-dom.development.js:12042
(anonymous) @ react-dom.development.js:25651
setTimeout (async)
(anonymous) @ utils.ts:405
sleep @ utils.ts:404
scheduleMicrotask @ utils.ts:414
flush @ notifyManager.ts:64
batch @ notifyManager.ts:31
dispatch @ query.ts:590
setData @ query.ts:204
onSuccess @ query.ts:472
resolve @ retryer.ts:103
Promise.then (async)
run @ retryer.ts:153
createRetryer @ retryer.ts:204
fetch @ query.ts:458
executeFetch @ queryObserver.ts:350
onSubscribe @ queryObserver.ts:107
subscribe @ subscribable.ts:15
(anonymous) @ useBaseQuery.ts:81
subscribeToStore @ react-dom.development.js:16958
commitHookEffectListMount @ react-dom.development.js:23150
commitPassiveMountOnFiber @ react-dom.development.js:24926
commitPassiveMountEffects_complete @ react-dom.development.js:24891
commitPassiveMountEffects_begin @ react-dom.development.js:24878
commitPassiveMountEffects @ react-dom.development.js:24866
flushPassiveEffectsImpl @ react-dom.development.js:27039
flushPassiveEffects @ react-dom.development.js:26984
commitRootImpl @ react-dom.development.js:26935
commitRoot @ react-dom.development.js:26682
performSyncWorkOnRoot @ react-dom.development.js:26117
flushSyncCallbacks @ react-dom.development.js:12042
(anonymous) @ react-dom.development.js:25651
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react-dom.development.js:16249 Uncaught TypeError: Cannot read properties of undefined (reading 'length')
    at areHookInputsEqual (react-dom.development.js:16249:38)
    at updateMemo (react-dom.development.js:17240:11)
    at Object.useMemo (react-dom.development.js:17886:16)
    at useMemo (react.development.js:1650:21)
    at useSyncExternalStoreWithSelector (with-selector.development.js:64:18)
    at useStore (index.tsx:17:17)
    at useRouterState (react.tsx:568:10)
    at useMatch (react.tsx:673:24)
    at useSearch (react.tsx:802:10)
    at _Task (Task.tsx:23:57)

[diego9497]

I'm having the same issue, I'm using @preact/signals-react@1.3.4, @reduxjs/toolkit"@1.8.5 and react@17.0.2, downgrade doesn't work for me since start thrown errors with the router.

react-dom.development.js:15866 Uncaught Error: TypeError: Cannot read properties of undefined (reading 'length')
    at updateMemo (react-dom.development.js:15866:1)
    at Object.useMemo (react-dom.development.js:16422:1)
    at useMemo (react.development.js:1532:1)
    at useSyncExternalStoreWithSelector (with-selector.development.js:64:1)
    at useSelector (useSelector.js:41:1)
    at TaskSubtasksSection (task-subtasks-section.tsx:34:38)
    at renderWithHooks (react-dom.development.js:14985:1)
    at updateFunctionComponent (react-dom.development.js:17365:1)
    at beginWork (react-dom.development.js:19072:1)
    at HTMLUnknownElement.callCallback (react-dom.development.js:3945:1)

[XantreDev]

@diego9497 can you provide repro? Is it enough to install signals, redux toolkit and use it just once?

[lucasbarrosomk6]

Ran into this problem as well. "@preact/signals-react": "1.3.6", doesn't play well with redux toolkit, is there a solution in the works?

[lucasbarrosomk6]

It is enough to install signals in a redux toolkit project and use it just once.

[jholmes033169]

Also getting this issue, also using redux (but not not toolkit). Downgrading did solve the problem, but I don't want to be stuck on 1.2.2. Attempting to upgrade to latest version of redux and see how this affects things.

[XantreDev]

Do you need to do something especial in rudux to have this issue. If you will provide it I will try to create test case

[XantreDev]

I've tried to reproduce it by writing simple counter, but all is working fine. What do I need to do to reproduce this behaviour? https://github.com/XantreGodlike/preact-signals-redux-issue

[jholmes033169]

Sorry... li will try to set up a test.

On Sun, Nov 12, 2023, 12:47 AM Valerii Smirnov @.***> wrote:

I've tried to reproduce it by writing simple counter, but all is working fine. What do I need to do to reproduce this behaviour? https://github.com/XantreGodlike/preact-signals-redux-issue

— Reply to this email directly, view it on GitHub https://github.com/preactjs/signals/issues/411#issuecomment-1807012228, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAZDYABBSD2WKLHLH5HAXXTYEBPHPAVCNFSM6AAAAAA4SJNTZKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTQMBXGAYTEMRSHA . You are receiving this because you commented.Message ID: @.***>

[jholmes033169]

Ok... so the only thing I need to do to reproduce this is add and setup react-redux in the a project. Straight up react-redux will do it... doesn't even need to be toolkit. I'm using react-redux ^8.0.2, react": "^18.2.0 and "redux": "^4.0.4",

[XantreDev]

Seems to be this issue related with react patching. Some default behaviour of react breaks after monkeypatching and this issue appears in big projects

[jholmes033169]

Yeah... confirmed it with another project with react-redux. I just pulled signals-react in and created a signal and had the same issue. This is a huge problem for migrating. We had hoped to move our thinking gradually from redux to signals. I don't know what the repercussions of sticking with 1.2.2 until we can fully migrate are, though.

[batlash]

Hi, I had the same problem. I had the following problem/warning (before I added the signal), which in my case seems to be the root case; Warning: Each child in a list should have a unique "key" prop. When that warning was resolved, this problem with the signal also was resolved (which caused that the application could not render). I hope that this could help.

[XantreDev]

Warning: Each child in a list should have a unique "key" prop.

So you've had elements with the same key and it caused this error, isn't it?

Cannot read properties of undefined (reading 'length')

[batlash]

Exactly, (or rather I had no key at all). So the solution in my case was to add a key (in a component that had noting to do with the signal).

(<div className="container">
                    {movies.map((movie) => <MovieCard  key={movie.imdbID} movie={movie} onClick={onCardClicked} />)}
 </div>)

[andrewiggins]

Our next major version of signals-react (hopefully coming out in the next couple weeks) is gonna deprecate and make opt-in the current React internal patching in favor of using a Babel transform to make components reactive to signals.

The transform is available now on NPM for trying out but some internal changes/fixes & more/updated documentation are needed before I consider it stable. I suspect that the transform won't have similar issues.

[XantreDev]

@andrewiggins I don't think this approach scales well - because we will lack support of next.js. Since their babel integration is kinda legacy and not all features will work with babel (next-fonts doesn't). So seems to be we cannot rely on transform, probably there should be transform for other parsers (swc, esbuild). For now I don't want to increate complexity and prepared manual intergation HOC for such environments, check my integration. I would like you to give me some feedback (it based on transform and signal-react integration source code)