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Warning: Prop className did not match. #7322
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Happens to me everytime. +1 |
The same happens with Next v.7. This error doesn't occur when the server starts, only after making changes in the code. |
I'm seeing the same error. It doesn't appear to affect the live app, but it's very annoying to have it constantly appearing locally. |
I have a similar error, but with inline style.
😢 |
I hope once enough people raise their voices here this issue will get attention 🙂 |
I face this issue in my simple navbar active className, is there a workaround until official fix? |
Use 👍 on the initial issue instead of "+1" and "same problem". If you do feel like posting +1 provide a clear and concise reproduction that is clearly reproducible. Otherwise the comment is not actionable. This goes for any open-source project you're commenting on. Thanks 🙏 |
Seems like they fixed latest release this bug styled-components/styled-components#2563 |
Nope, that's a totally different log message, it is the one with yellow background on the screenshot I posted, it disappeared after the update. First one, warning about different classNames is still there. |
Tagging this as up for grabs to investigate by a motivated contributor. |
Hey there, please update babel-plugin-styled-components to the latest version which should fix css prop mismatches: https://github.com/styled-components/babel-plugin-styled-components/releases/tag/v1.10.1 I've noticed an error message in development still, but no ill effects from it so can be safely ignored. |
Still same after fix posted above, and can't ignore it. Having some layout problems when this error occurs. |
So do I, when this occurs I'm getting layout errors and my component go into a weird state where they do not render based on new props. It happens for me in an inline style. |
Make sure your babel plugin version is up to date, lots of fixes in the last couple weeks. We also made changes to how we do dev styles in v5 that largely address this issue |
The |
"style" is an inline style and nothing to do with styled-components, so that's a totally separate issue |
what's the fix for this one? i always get this warning everytime i refresh. |
It appears to be an issue that backend generates styled component but client doesn't get it/doesn't use it and instead of using server side rendered style client generates it by itself. edit: I just downloaded the example and couldn't reproduce the issue while using the same code as in your codepen sandbox. Tested in chrome and firefox and it behaves the same (no error nor warning). |
@jass-trix have you tried the s-c v5 beta? We made a lot of changes to eliminate this issue. |
@probablyup how to use this version? |
I have this issue as well after upgrading to next 9.0.2 and styled components 4.3.2 but it does not occur every time. I have to go in and out of debug a few times to replicate at certain points. I have attempted the fixes suggested through similar issues such as styled-components/babel-plugin-styled-components#78. Seems to only effect development and I'm experiencing layout breaks in one section of the app. Still not sure if it is related to styled components or next but it does seem to have to do with SSR classnames being different on client/server I'm using the recommended babel plugin to fix this. babel-plugin-styled-components |
We changed how this all works in v5, I’d recommend trying it out.
…On Tue, Jul 23, 2019 at 9:42 AM JohnGrisham ***@***.***> wrote:
It appears to be an issue that backend generates styled component but
client doesn't get it/doesn't use it and instead of using server side
rendered style client generates it by itself.
edit: I just downloaded the example and couldn't reproduce the issue while
using the same code as in your codepen sandbox. Tested in chrome and
firefox and it behaves the same (no error nor warning).
I have this issue as well after upgrading to next 9.0.2 and styled
components 4.3.2 but it does not occur every time. I have to go in and out
of debug a few times to replicate at certain points. I have attempted the
fixes suggested through similar issues such as
styled-components/babel-plugin-styled-components#78
<styled-components/babel-plugin-styled-components#78>.
Seems to only effect development and I'm experiencing layout breaks in one
section of the app. Still not sure if it is related to styled components or
next but it does seem to have to do with SSR classnames being different on
client/server I'm using the recommended babel plugin to fix this.
*babel-plugin-styled-components*
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I was in the process of trying the beta but I appreciate your quick response 👍 @probablyup |
I have solved this issue following these steps.
|
That's the only way to solve my problem... It's unfortunate to see that 2 years later, this issue still opened... Thanks. |
but this way you will slow compilations(NextJs 12), because when you create .babelrc next js will change rust swc to babel causing decreasing compilation speed |
Not working yet in 12.0.3 without the babel config |
same v12 |
Having the same issue with a fresh next 12 repo and styled components |
i have enable swc typescript compiler i dont want to add any babel config because its automatically disabled swc compiler. |
And still happens. It's so freaking annoying |
This is still very much an open issue and should not be closed. The proposed fixes only work temporarily and this issue has not been addressed in the latest released despite what the devs have indicated. |
Hey guys, just reporting that I am facing the same problem. I am not using styled-components, in my case the error happens on
=] |
@justyn-clark @Amirhosein-hshm @simonpeters
Unfortunately so many other comments have drowned the reply that explains why the warning is shown by React. To clarify again: this is not an issue with Next.js, it's an issue with the specific library that you're using when it is hydrated by React (which is a feature of React). In general it's one of these that causes the mismatch on
Unfortunately there is no way to pin these comments and I don't want to lock this thread. We'll have a look at potentially intercepting this particular error coming from React and adding a Next.js docs link to it similar to what we do for errors coming from Next.js itself. |
Hey @timneutkens ... thank you so much for your quick reply, and sorry not digging a bit more into the older replies, my bad. Now I see the issue regarding hydration, and you are right, I had a condition verifying if |
Awesome, thanks @timneutkens ! Working with 12.0.4 and
|
Thank you @timneutkens & @joshwcomeau (In his article 'The Perils of Rehydration'.), you helped me a lot. ❤ import React from "react";
const ClientOnly = ({ children, ...delegated }) => {
const [hasMounted, setHasMounted] = React.useState(false);
React.useEffect(() => {
setHasMounted(true);
}, []);
if (!hasMounted) return null
return (
<React.Fragment {...delegated}>
{children}
</React.Fragment>
);
}
export default ClientOnly <ClientOnly>
<SomeComponnet/>
</ClientOnly> |
FWIW, I tried a lot of solutions layed out in this thread and this was the only one that worked. I'm using NextJS 12 with Material UI 5 |
This is a good solution when running in dev, but it's unfortunate to need to include when the issue doesn't present itself when the bundle is built. |
Hey guys, I saw this article on Medium and fixed this. Like, follow the steps, copy and paste the code and you're golden. https://binyamin.medium.com/solving-the-styled-components-warning-in-next-js-with-babel-83080e45a0ff |
Hi guys, I've tried so many solutions in this thread these couple few days, still get this warning.
So I changed the way to import those components by using next/dynamic (with No SSR) and finally fixed this :D! example: // /pages/index.js
import dynamic from 'next/dynamic'
const CircleButtonWithNoSSR = dynamic(() => import('../components/Buttons/CircleButton'), { ssr: false })
const HomePage = () => {
return (
<p>Home Page Title</p>
<CircleButtonWithNoSSR color='gold' whileHover={{ scale: 1.2 }} />
)
}
export default HomePage // /components/buttons/CircleButton.js
import styled from 'styled-components'
import { motion } from 'framer-motion'
const CircleButton = styled(motion.button)`
color: ${({ theme, color }) => color ? color : theme.color.primary};
`
export default CircleButton Update: After a day, I kind of restructured my code like this 😄 // /components/NoSsr.js
import dynamic from 'next/dynamic'
const NoSsr = ({ children }) => <>{children}</>
export default dynamic(() => Promise.resolve(NoSsr), { ssr: false }) // /pages/index.js
import NoSsr from '../components/NoSsr'
import CircleButton from '../components/buttons/CircleButton'
const HomePage = () => {
return (
<>
<p>Home Page Title</p>
<NoSsr>
<CircleButton color='gold' whileHover={{ scale: 1.2 }} />
</NoSsr>
</>
)
} |
Thank you so much! This fix worked for '@mui/styles/styled' too! |
1. Prop XXX did not match. Server: "null 或 AAA" Client: "OOO" → vercel/next.js#7322 (comment) 2. Transient Props 問題 → react 不認得的 prop 前面加 $ (component 本身也要加) 3. Tag Button Active 時的動畫做好 + 顏色改固定不隨機了 4. _document 因應 SSR 整個改寫 (參考 nextjs/example/with-styled-components) 5. 調整 theme 物件 color 的結構 (分為 toneColor(固定不變)、coreColor(亮暗模式會變)) 6. 取消在變換 Tag 時的 shallow routing (breadcrumb 配合調整如果沒有那頁面就顯示普通文字)
actually next.js has an undocumented |
error: Prop
I updated the to next 12.0.10, still got the issue |
For all: check your React Components if you import them correctly. |
Examples bug report
Example name
with-styled-components
Describe the bug
Also posted here: #2538
Using
css
prop introduced with styled-components v4 causesWarning: Prop className did not match.
.To Reproduce
Add any HTML element with
css
prop.Expected behavior
Correctly styled rendering on the server side without any warnings.
Screenshots
System information
Additional context
Here is an example I created to demonstrate the issue: https://codesandbox.io/embed/jlwvwyy0ow
Open this and refresh once the building is done: https://jlwvwyy0ow.sse.codesandbox.io/
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