scalacenter/scalajs-bundler

Hello. I just made the switch from 0.6.x to 1.3.1. I am struggling with getting our build to work again. I hope I can get help here.

We are using ScalaJS with the sbt-web-scalajs-bundler for a small SPA. In 0.6 we imported some static files located in our resource folder like this

@js.annotation.JSImport("resources/Main.scss", js.annotation.JSImport.Default)

which worked fine. After upgrading, webpack complains, that there is no loader defined for our sass files, although we have it in place (as we did before):

[error] Module parse failed: Unexpected character '@' (1:0)
[error] You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file.[...]

resolve: {
    alias: {
      'resources': path.resolve(__dirname, '../../../../src/main/js'),
    },
    modules: [path.resolve(__dirname, 'node_modules')]
},
module: {
    rules: [
     {
        test: new RegExp("\\.scss$"),
        use: [
          // Creates `style` nodes from JS strings
          'style-loader',
          // Translates CSS into CommonJS
          'css-loader',
          // Compiles Sass to CSS
          'sass-loader',
        ],
    }
  ]
 },

Also the source-map-loader emits warnings about not finding the scala sources.

[warn] Module Warning (from ./node_modules/source-map-loader/index.js):
[...]
[warn] NonErrorEmittedError: (Emitted value instead of an instance of Error) Cannot find source file[...]

I guess i am missing something basic here?