MuiPickersFadeTransitionGroupRoot: Support for defaultProps will be removed from function components in a future major release. Use JavaScript default parameters instead.

[mtr1990]

MuiPickersFadeTransitionGroupRoot: Support for defaultProps will be removed from function components in a future major release. Use JavaScript default parameters instead.

[hongz1]

@LukasTy I got two warnings today although "react/require-default-props" is off. any suggestions to hide these warnings?

Warning: MuiPickersFadeTransitionGroupRoot: Support for defaultProps will be removed from function components in a future major release. Use JavaScript default parameters instead. at eval (webpack-internal:///(ssr)/./node_modules/@emotion/react/dist/emotion-element-6bdfffb2.esm.js:61:74) at PickersFadeTransitionGroup (webpack-internal:///(ssr)/./node_modules/@mui/x-date-pickers/DateCalendar/PickersFadeTransitionGroup.js:45:83) at div at eval (webpack-internal:///(ssr)/./node_modules/@emotion/react/dist/emotion-element-6bdfffb2.esm.js:61:74) at div at eval (webpack-internal:///(ssr)/./node_modules/@emotion/react/dist/emotion-element-6bdfffb2.esm.js:61:74) at PickersCalendarHeader (webpack-internal:///(ssr)/./node_modules/@mui/x-date-pickers/PickersCalendarHeader/PickersCalendarHeader.js:154:97) at div at eval (webpack-internal:///(ssr)/./node_modules/@emotion/react/dist/emotion-element-6bdfffb2.esm.js:61:74) at DateCalendar (webpack-internal:///(ssr)/./node_modules/@mui/x-date-pickers/DateCalendar/DateCalendar.js:165:86)

Warning: MuiPickersSlideTransitionRoot: Support for defaultProps will be removed from function components in a future major release. Use JavaScript default parameters instead. at eval (webpack-internal:///(ssr)/./node_modules/@emotion/react/dist/emotion-element-6bdfffb2.esm.js:61:74) at PickersSlideTransition (webpack-internal:///(ssr)/./node_modules/@mui/x-date-pickers/DateCalendar/PickersSlideTransition.js:130:83) at eval (webpack-internal:///(ssr)/./node_modules/@emotion/react/dist/emotion-element-6bdfffb2.esm.js:61:74) at div at eval (webpack-internal:///(ssr)/./node_modules/@emotion/react/dist/emotion-element-6bdfffb2.esm.js:61:74) at DayCalendar (webpack-internal:///(ssr)/./node_modules/@mui/x-date-pickers/DateCalendar/DayCalendar.js:258:84) at div at Transition (webpack-internal:///(ssr)/./node_modules/react-transition-group/esm/Transition.js:130:34) at Fade (webpack-internal:///(ssr)/./node_modules/@mui/material/Fade/Fade.js:56:79)

[mernblockchainlover2019]

Hi Guys?
I faced same issues with @hongz1.
I used Next.js/Typescript/MUI.
Could you help me?

[oliviertassinari]

As for why the error is reported on MuiPickersFadeTransitionGroupRoot, it's because of https://github.com/emotion-js/emotion/blob/73f688103c5307c90d7544508b6d935243e4299e/packages/styled/src/base.js#L183. We could yolo do:

const PickersSlideTransitionRoot = styled(TransitionGroup, {

+delete PickersSlideTransitionRoot.defaultProps;

to silence the error, but the one on TransitionGroup will stay 😄. So we truly want reactjs/react-transition-group#898.

I'm recording this in: emotion-js/emotion#3184. It will make sense to kill this line at one point.

[michaldudak]

Maybe only consider removing this rule:
https://github.com/mui/material-ui/blob/bf891feebee5473be8ee2795878950f186dd75d7/.eslintrc.js#L160
It was added 3 years ago and seems like it should not be turned off nowadays when such a thing is already deprecated. 🙈
WDYT @mui/code-infra?

This rule is disabled, so the deprecated defaultProps are not required. If we remove it, we'll get many errors such as propType "theme" is not required, but has no corresponding defaultProps declaration

[RaphyPoo]

This is also happening to me on my nextjs 14.1.4 application, is there a fix or not yet?

[oliviertassinari]

@LukasTy It feels like:

1. We could have this issue open. The problem is still present.
2. We could solve this with #11531 (comment) for the time being, leaving a "TODO remove once reactjs/react-transition-group#898 fixed"
3. We could ask Sebastian access to react-transition-group to carry this one forward for React 19 support.

[LukasTy]

Thank you for reporting this problem. 👍
It seems to be coming from https://github.com/reactjs/react-transition-group/blob/2989b5b87b4b4d1001f21c8efa503049ffb4fe8d/src/TransitionGroup.js#L169 and the fact that we are wrapping this component with styled.
The root cause still seems to be inside of the react-transition-group.
I'm not sure if we can do anything about it as it is... 🤷
Maybe only consider removing this rule:
https://github.com/mui/material-ui/blob/bf891feebee5473be8ee2795878950f186dd75d7/.eslintrc.js#L160
It was added 3 years ago and seems like it should not be turned off nowadays when such a thing is already deprecated. 🙈
WDYT @mui/code-infra?

P.S. The same error is also thrown if a TransitionGroup component is wrapped in a styled call on the application side. Tested with the provided example locally.

I will create an issue in the react-transition-group repository to handle the removal of defaultProps.

[LukasTy]

@mtr1990 We've decided to not do anything in this regard.
The react-transition-group package is a direct dependency of the pickers package, whenever they will support the new approach for defining the defaultProps - we will inherit it by bumping the dependency version.
In the meantime, consider disabling the rule, just as we did: https://github.com/mui/material-ui/blob/bf891feebee5473be8ee2795878950f186dd75d7/.eslintrc.js#L160 because it's clear that this transition is not that important to the React team if they didn't go through with updating packages that they maintain. 😉

[LukasTy]

@hongz1 Would you be able to provide a minimal reproduction example so that we could test this behavior? 🤔
A GitHub repo would be as helpful as a live example. 👍

[hongz1]

test-app.zip

@LukasTy Here you go. I made new nextjs app with minimal dependencies. You will see those warning messages when you go to /test page.

[palucdev]

Is there any way to hide the warning or disable it for simple DateCalendar component usage? "react/require-default-props": "off" doesn't work for me.

[LukasTy]

Is there any way to hide the warning or disable it for simple DateCalendar component usage? "react/require-default-props": "off" doesn't work for me.

You are probably referring to an ESLint rule?
The error is thrown by React runtime, which does not work together with your ESLint config in any way. 🙈

I'm sorry, but there does not seem to be any quick way to fix the issue.
It has to be fixed upstream or we have to replace react-transition-group (if React no longer maintains it and can't keep it in sync with React itself). 🙈

As for the time being—feel free to experiment with this suggestion: recharts/recharts#3615 (comment) 😉