webpack.config.js

const path = require('path');

module.exports = {
  module: {
    rules: [
      {
        test: /\.scss$/,
        use: [
          { loader: 'style-loader' },
          {
            loader: 'css-loader',
            options: { importLoaders: 2 },
          },
          {
            loader: 'postcss-loader',
            options: {
              plugins: () => [
                require('autoprefixer')({
                  browsers: ['last 1 version', 'ie >= 11'],
                }),
              ],
            },
          },
          {
            loader: 'sass-loader',
            options: {
              includePaths: [path.resolve(__dirname, '..', 'node_modules')],
            },
          },
        ],
      },
    ],
  },
};