CssInJs is not working with static export

[Tokenyet]

System information

• OS: Winodws
• Version of Next.js: 8.0.6

I just publish a site that used cssinjs with Nextjs. The static export store class and property in someway, but I used cssinjs, so there is a conflict with the online page.

Here is the site:
https://minecraftscepter.github.io/

It would be correct about 0.5 sec, but going wrong on stable state. In my test, I stop quickly to see the class makeStyles-grow-9 is working great, but simply missing when stable. (Header part)

Open console to see the log with CssInJs, that print jss9, and then I replace makeStyles-grow-9 with jss9, everything is working as expected.

It's a bit strange that everything works in local (npm run dev or serve static files), but not online, Hope you got what I described, and thanks for taking a look.

The first 0.1 sec:

The stable state:

The css generated by cssinjs:

serve static files (which is jss, not the prefix of makestyle):

[Tokenyet]

Sorry for metion here, It might be materialui's problem mui/material-ui#18018.

[Tokenyet]

It's fine now, based on a large number of configureation test, I sloved It with disable the removed server-side css in _app.tsx, and used createGenerateClassName with disableGlobal to prevent removing correct initialization...

[balazsorban44]

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