Unable to get preproces working. (scss)

[jankaifer]

Hi,
this is probably not a bug, but I don't know about any better place to ask.
I tried to add scss support with svelte-preprocess (It compiles and works well), but I was unable to get rid of errors like this:

I added the following svelte.config.js file:

const preprocess = require("svelte-preprocess");

module.exports = {
  preprocess: [preprocess()],
};

But it doesn't work.

I also tried the code suggested here: #1 (comment)

Thanks for any directions or ideas why is this happening.