webpack.common.js

const path = require('path');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const TerserPlugin = require('terser-webpack-plugin');

module.exports = {
  entry: './src/index.js',
  output: {
    filename: '[name].bundle.js',
    path: path.resolve(__dirname, 'public'),
    publicPath: '/'
  },
  plugins: [new MiniCssExtractPlugin()],
  module: {
    rules: [
      {
        include: [path.resolve(__dirname, 'src')],
        test: /\.js$/,
        use: 'babel-loader'
      },
      {
        test: /.css$/,
        use: [
          {
            loader: MiniCssExtractPlugin.loader
          },
          {
            loader: 'css-loader',
            options: {
              sourceMap: true
            }
          }
        ]
      }
    ]
  },
  optimization: {
    minimizer: [new TerserPlugin()],
    splitChunks: {
      cacheGroups: {
        vendors: {
          priority: -10,
          test: /[\\/]node_modules[\\/]/
        }
      },
      chunks: 'async',
      minChunks: 1,
      minSize: 30000,
      name: false
    }
  }
};