• I have read the contribution documentation for this project.
• I agree to follow the code of conduct that this project follows, as appropriate.
• I have searched the issue tracker for an issue that matches the one I want to file, without success.

Please describe your issue:
I try to use SCSS for my electron-forge project. I have included the SCSS file like this:

<link rel="stylesheet" type="text/scss" href="style.scss" />

(I could not find any documentation on this, but saw some examples from other people)

When I start the app no CSS is applied, I get a console warning that says:

Resource interpreted as Stylesheet but transferred with MIME type text/plain

If I modify my SCSS and refresh the window, the CSS is working. But only until I refresh or restart the application again.

There is no output in the terminal apart from HMR sent to all windows!.

Console output when you run electron-forge with the environment variable DEBUG=electron-forge:*. (Instructions on how to do so here). Please include the stack trace if one exists.

HMR sent to all windows!

What command line arguments are you passing?

DEBUG=electron-forge:* electron-forge start

What does your config.forge data in package.json look like?

"config": {
        "forge": {
            "make_targets": {
                "win32": [
                    "squirrel"
                ],
                "darwin": [
                    "zip"
                ],
                "linux": [
                    "deb",
                    "rpm"
                ]
            },
            "electronPackagerConfig": {},
            "electronWinstallerConfig": {
                "name": "patternlab_desktop"
            },
            "electronInstallerDebian": {},
            "electronInstallerRedhat": {},
            "github_repository": {
                "owner": "",
                "name": ""
            },
            "windowsStoreConfig": {
                "packageName": "",
                "name": "patternlabdesktop"
            }
        }
    },

Please provide either a failing minimal testcase (with a link to the code) or detailed steps to
reproduce your problem. Using electron-forge init is a good starting point, if that is not the
source of your problem.

I haven't changed any config, I only started out with the React template, and a SCSS file inside src. Then I just start the project with electron-forge start.