webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

const isProduction = process.env.NODE_ENV === 'production';

module.exports = {
  mode: isProduction ? 'production' : 'development',
  entry: './src/app.ts',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'app.js',
    publicPath: isProduction ? '' : '/',
  },
  module: {
    rules: [
      {
        test: /\.ts$/,
        use: 'ts-loader',
        exclude: /node_modules/,
      },
      {
        test: /\.css$/,
        use: [
          isProduction ? MiniCssExtractPlugin.loader : 'style-loader',
          'css-loader'
        ],
      },
    ],
  },
  resolve: {
    extensions: ['.ts', '.js'],
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './index.html',
    }),
    new MiniCssExtractPlugin({
      filename: 'styles.css',
    }),
  ],
  devServer: {
    static: {
      directory: path.join(__dirname, 'dist'),
    },
    compress: true,
    port: 9000,
    hot: true,
    open: true,
    historyApiFallback: true,
    watchFiles: ['src/**/*', 'index.html'],
  },
  devtool: isProduction ? 'source-map' : 'eval-source-map',
};