webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const Dotenv = require('dotenv-webpack');
const PRODUCTION = process.env.NODE_ENV === 'production';

const cssLoaders = [
  'css-loader',
  {
    loader: 'postcss-loader',
    options: {
      plugins: [require('autoprefixer')],
    },
  },
  'sass-loader',
];

module.exports = {
  entry: './src/index.ts',
  mode: PRODUCTION ? 'production' : 'development',
  devtool: PRODUCTION ? 'source-map' : 'inline-source-map',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'bundle.js',
  },
  module: {
    rules: [
      {
        test: /\.tsx?$/,
        use: 'ts-loader',
        exclude: /node_modules/,
      },
      {
        test: /\.string\.scss$/,
        use: cssLoaders,
      },
      {
        test: /(?<!\.string)\.scss$/,
        use: [
          'style-loader',
          ...cssLoaders,
        ],
      },
      {
        test: /\.(png|svg|jpg|gif)$/,
        use: ['file-loader'],
      },
    ],
  },
  resolve: {
    extensions: ['.tsx', '.ts', '.js'],
  },
  plugins: [
    new Dotenv(),
    new HtmlWebpackPlugin({
      template: './public/index.html',
    }),
  ],
};