webpack.server.config.js

const path = require('path')
const webpack = require('webpack')
const webpackNodeExternals = require('webpack-node-externals')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
require('dotenv').config()

module.exports = (e, r) => {
  return {
    target: 'node',
    node: false, // it enables '__dirname' in files. If is not, '__dirname' always return '/'.
    mode: r.mode,
    devtool: r.mode === 'production' ? false : 'inline-source-map',
    entry: {
      index: path.resolve(__dirname, 'server', 'index.ts')
    },
    output: {
      path: path.resolve(__dirname, './dist'),
      filename: '[name].js',
      chunkFilename: '[name].js'
    },
    module: {
      rules: [
        {
          test: /\.s?css$/i,
          exclude: /\.module\.s?css$/i,
          use: [MiniCssExtractPlugin.loader, 'css-loader', 'sass-loader']
        }, // CSS Module ([filename].module.css)
        {
          test: /\.module\.s?css$/i,
          use: [
            MiniCssExtractPlugin.loader,
            {
              loader: 'css-loader',
              options: {
                modules: true
              }
            },
            'sass-loader'
          ]
        },
        {
          test: /\.jsx?$|\.tsx?$/,
          use: 'babel-loader'
        }
      ]
    },
    resolve: {
      extensions: ['.js', '.ts', '.tsx', '.jsx']
    },
    plugins: [new MiniCssExtractPlugin(), new webpack.DefinePlugin({ 'process.env': JSON.stringify(process.env) })],
    externals: [webpackNodeExternals()]
  }
}