ssr-react | side render React , hydrate it on the client and combine | Server Side Rendering library

I've tested your repo then I found out a few things needing fixed to make it running. Back to above error, the error is from setting up file-loader which no test rule which is likely to match all file types excluding [/\.js$/, /\.html$/, /\.json$/] but contains css, then css files have been passed to css rule where the error got occurred.

In short, the file-loader should match assets file such as: images/fonts/... but not css file. So as long as set the test files right, it would build successfully: