webpack.config.js

const isDevEnv = process.env.NODE_ENV !== 'production'
const path = require("path");
const MiniCssExtractPlugin = require('mini-css-extract-plugin')

module.exports = {
  entry: "./src/client/index.tsx",
  output: {
    path: path.resolve(__dirname, "public"),
    filename: "bundle.js",
  },
  resolve: {
    extensions: [".ts", ".tsx", ".js",".css"],
  },
  module: {
    rules: [
      {
        test: /\.ts(x?)$/,
        exclude: /node_modules/,
        use: [
          {
            loader: "ts-loader",
          },
        ],
      },
      {
        test: /\.css$/,
        use: [
          'style-loader',
          { loader: 'css-loader', options: { importLoaders: 1 } },
          'postcss-loader'
        ]
      },
    ],
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: isDevEnv ? '[name].css' : '[name].[hash].css'
    })
  ]
};