webpack.config.js

module: {
      rules: [
        {
          test: /\.styl$/,
          loader: 'style-loader!css-loader!stylus-loader'
        },
        { test: /\.css$/i, 
          use: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: ['css-loader?sourceMap']
        }) },
        { test: /\.ts$/i, use: ['ts-loader', '@aurelia/webpack-loader'], exclude: /node_modules/ },
        { test: /\.html$/i, use: '@aurelia/webpack-loader', exclude: /node_modules/ }
      ]
    },