"Using a Function As <Admin> Child" gives "not assignable to type 'ReactNode'.ts(2322)" with @types/react 18 about react-admin HOT 4 OPEN

Thanks for the report.
Can you please provide a reproduction sandbox?

from react-admin.

I did nothing, just clicked on your link and opened the index.tsx file:

Noticeable in yarn.lock:
"@types/react@*":
version "18.2.8"

from react-admin.

May be a hint, with what is usually children: AdminChildren, in ra-ui-materialui\src\theme\ThemeProvider.tsx:

export interface ThemeProviderProps {
    children: ReactNode;

and so on, deeper in @mui/material/styles.

from react-admin.

Indeed, it can be reproduced straight from the sandbox! 😅
We'll look into it, thanks!

It's also worth mentioning that this may have been fixed already on the next branch, since we upgraded our monorepo to use React 18 for the upcoming v5.

We need to check whether this fix could be applied to the master branch too, or if it requires a breaking change.

from react-admin.