Benjamin Cerf

> @Nico142 > I also tried to fix the issue in `@mui/styled-engine-sc` locally and changing the import from default to named [here](https://github.com/mui/material-ui/blob/master/packages/mui-styled-engine-sc/src/index.js#L1) seems to fix it. When I'm changing it...

For info, > @Nico142 > You can also resolve this issue by using [inline deps](https://vitest.dev/config/#server-deps-inline), though I haven’t tested whether it’s faster than `fallbackCJS` We did an empirical test with...