webpack.config.js

const path = require('path');

const CssMinimizerPlugin = require('css-minimizer-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const RemoveEmptyScriptsPlugin = require('webpack-remove-empty-scripts');

module.exports = {
  mode: 'production',
  entry: {
    search: path.resolve(__dirname, 'frontend/index.scss')
  },
  output: {
    path: path.resolve(__dirname, 'app/assets/bundle/trestle')
  },
  optimization: {
    minimizer: [
      new CssMinimizerPlugin()
    ]
  },
  module: {
    rules: [
      {
        test: /\.s?[ac]ss$/,
        use: [
          { loader: MiniCssExtractPlugin.loader },
          { loader: 'css-loader' },
          {
            loader: 'postcss-loader',
            options: {
              postcssOptions: {
                plugins: [
                  ['autoprefixer', {}]
                ]
              }
            }
          },
          { loader: 'sass-loader' }
        ]
      }
    ]
  },
  plugins: [
    new RemoveEmptyScriptsPlugin(),
    new MiniCssExtractPlugin({
      filename: '[name].css'
    })
  ]
}