Not Working in React Strict Mode

[Vitorbnc]

Guidelines

Describe the bug
Icons don't appear and and an error shows up in console. The error is as follows:

index.js:1 Warning: findDOMNode is deprecated in StrictMode. findDOMNode was passed an instance of Transition which is inside StrictMode. Instead, add a ref directly to the element you want to reference. Learn more about using refs safely here: https://reactjs.org/link/strict-mode-find-node
at div
at Transition (http://localhost:3000/static/js/vendors~main.chunk.js:95502:30)
at Grow (http://localhost:3000/static/js/vendors~main.chunk.js:21102:24)
at div
at Portal (http://localhost:3000/static/js/vendors~main.chunk.js:29447:24)
at Popper (http://localhost:3000/static/js/vendors~main.chunk.js:29126:24)
at Tooltip (http://localhost:3000/static/js/vendors~main.chunk.js:39718:28)
at WithStyles (http://localhost:3000/static/js/vendors~main.chunk.js:53036:31)
at div
at MTablePagination (http://localhost:3000/static/js/vendors~main.chunk.js:3055:10)
at MTablePaginationRef
at WithStyles (http://localhost:3000/static/js/vendors~main.chunk.js:53036:31)
at ActionsComponent
at div
at Toolbar (http://localhost:3000/static/js/vendors~main.chunk.js:39434:23)
at WithStyles (http://localhost:3000/static/js/vendors~main.chunk.js:53036:31)
at td
at TableCell (http://localhost:3000/static/js/vendors~main.chunk.js:36682:28)
at WithStyles (http://localhost:3000/static/js/vendors~main.chunk.js:53036:31)
at TablePagination (http://localhost:3000/static/js/vendors~main.chunk.js:37226:37)
at WithStyles (http://localhost:3000/static/js/vendors~main.chunk.js:53036:31)
at tr
at TableRow (http://localhost:3000/static/js/vendors~main.chunk.js:37643:23)
at WithStyles (http://localhost:3000/static/js/vendors~main.chunk.js:53036:31)
at tfoot
at TableFooter (http://localhost:3000/static/js/vendors~main.chunk.js:36945:23)
at WithStyles (http://localhost:3000/static/js/vendors~main.chunk.js:53036:31)
at table
at Table (http://localhost:3000/static/js/vendors~main.chunk.js:36301:23)
at WithStyles (http://localhost:3000/static/js/vendors~main.chunk.js:53036:31)
at div
at Paper (http://localhost:3000/static/js/vendors~main.chunk.js:28361:23)
at WithStyles (http://localhost:3000/static/js/vendors~main.chunk.js:53036:31)
at Container (http://localhost:3000/static/js/vendors~main.chunk.js:394:27)
at ContainerRef
at Provider (http://localhost:3000/static/js/vendors~main.chunk.js:91681:20)
at App (http://localhost:3000/static/js/vendors~main.chunk.js:62505:25)
at ErrorBoundary (http://localhost:3000/static/js/vendors~main.chunk.js:55703:35)
at DragDropContext (http://localhost:3000/static/js/vendors~main.chunk.js:62637:19)
at MaterialTable (http://localhost:3000/static/js/vendors~main.chunk.js:6488:37)
at http://localhost:3000/static/js/vendors~main.chunk.js:6340:16
at WithStyles (http://localhost:3000/static/js/vendors~main.chunk.js:53036:31)
at Main
at Route (http://localhost:3000/static/js/vendors~main.chunk.js:94154:29)
at PrivateRoute (http://localhost:3000/static/js/main.chunk.js:5512:14)
at Switch (http://localhost:3000/static/js/vendors~main.chunk.js:94356:29)
at main
at div
at div
at MiniDrawer (http://localhost:3000/static/js/main.chunk.js:2800:3)
at Switch (http://localhost:3000/static/js/vendors~main.chunk.js:94356:29)
at Router (http://localhost:3000/static/js/vendors~main.chunk.js:93789:30)
at HashRouter (http://localhost:3000/static/js/vendors~main.chunk.js:93454:35)
at Routes
at App
at CssBaseline (http://localhost:3000/static/js/vendors~main.chunk.js:15878:31)
at WithStyles (http://localhost:3000/static/js/vendors~main.chunk.js:53036:31)
at ThemeProvider (http://localhost:3000/static/js/vendors~main.chunk.js:51738:24)
at Provider (http://localhost:3000/static/js/vendors~main.chunk.js:91681:20)
console. @ index.js:1
printWarning @ react-dom.development.js:67
error @ react-dom.development.js:43
findHostInstanceWithWarning @ react-dom.development.js:25406
findDOMNode @ react-dom.development.js:26067
performEnter @ Transition.js:245
updateStatus @ Transition.js:228
componentDidMount @ Transition.js:172
commitLifeCycles @ react-dom.development.js:20663
commitLayoutEffects @ react-dom.development.js:23426
callCallback @ react-dom.development.js:3945
invokeGuardedCallbackDev @ react-dom.development.js:3994
invokeGuardedCallback @ react-dom.development.js:4056
commitRootImpl @ react-dom.development.js:23151
unstable_runWithPriority @ scheduler.development.js:468
runWithPriority$1 @ react-dom.development.js:11276
commitRoot @ react-dom.development.js:22990
performSyncWorkOnRoot @ react-dom.development.js:22329
(anonymous) @ react-dom.development.js:11327
unstable_runWithPriority @ scheduler.development.js:468
runWithPriority$1 @ react-dom.development.js:11276
flushSyncCallbackQueueImpl @ react-dom.development.js:11322
flushSyncCallbackQueue @ react-dom.development.js:11309
scheduleUpdateOnFiber @ react-dom.development.js:21893
dispatchAction @ react-dom.development.js:16139
(anonymous) @ useControlled.js:38
handleOpen @ Tooltip.js:273
(anonymous) @ Tooltip.js:306
setTimeout (async)
(anonymous) @ Tooltip.js:305
callCallback @ react-dom.development.js:3945
invokeGuardedCallbackDev @ react-dom.development.js:3994
invokeGuardedCallback @ react-dom.development.js:4056
invokeGuardedCallbackAndCatchFirstError @ react-dom.development.js:4070
executeDispatch @ react-dom.development.js:8243
processDispatchQueueItemsInOrder @ react-dom.development.js:8275
processDispatchQueue @ react-dom.development.js:8288
dispatchEventsForPlugins @ react-dom.development.js:8299
(anonymous) @ react-dom.development.js:8508
batchedEventUpdates$1 @ react-dom.development.js:22396
batchedEventUpdates @ react-dom.development.js:3745
dispatchEventForPluginEventSystem @ react-dom.development.js:8507
attemptToDispatchEvent @ react-dom.development.js:6005
dispatchEvent @ react-dom.development.js:5924
unstable_runWithPriority @ scheduler.development.js:468
dispatchUserBlockingUpdate @ react-dom.development.js:5894

To Reproduce
Steps to reproduce the behavior:

1. Run the styling example from material-table docs.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: Windows 10
• Browser: Chrome
• Version: 90

[oze4]

Do we know if this is from a dependency or not? I've seen that before and want to say it may be an issue with a dep.

I can check here in a few minutes.

[Vitorbnc]

I fixed the icons problem. It's not actually a problem and it's explained in the material-table docs.

The findDOMNode error also occurs in the original material-table repo. It's probably related to material-ui itself.
There's an issue here, and they say it's possible to alter the imports to fix it for now, but it should be fixed in material-ui v5. I don't know what is causing it in this library though, I've used createMuiTheme before and there were no warnings.

[Domino987]

Yes seems like it's connected to the not strict Mode components of muiv4. Try out our next branch which is v5 supported and see if that helps.

I see the icons in the demo currently on both docs sites though.