webpack.vue.config.sass.js

      {
        test: /\.vue$/,
        loader: 'vue-loader',
        options: {
          loader: {
            scss: 'vue-style-loader!css-loader!sass-loader',
          },
        },
      },
      {
        test: /\.(css|scss|sass)$/,
        use: [
          'style-loader',
          MiniCssExtractPlugin.loader,
          {
            loader: 'css-loader',
            options: { sourceMap: true },
          },
          {
            loader: 'postcss-loader',
            options: {
              sourceMap: true,
              config: { path: path.join(__dirname, './postcss.config.js') },
            },
          },
          {
            loader: 'sass-loader',
            options: {
              sourceMap: true,
              additionalData: `@import "@/theme/utils.scss";`,
            },
          },
        ],
      },