webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
  entry: './src/index.tsx',
  output: {
    path: path.resolve(__dirname, 'build'),
    filename: 'bundle.js',
  },
  module: {
    rules: [
      {
        test: /\.css$/i,
        use: ['style-loader', 'css-loader'],
      },
      {
        test: /\.less$/i,
        // обработка идет справа налево
        use: ['style-loader', 'css-loader', 'less-loader'],
      },
      {
        test: /\.s[ac]ss$/i,
        use: [
          // Creates `style` nodes from JS strings
          'style-loader',
          // Translates CSS into CommonJS
          'css-loader',
          // Compiles Sass to CSS
          'sass-loader',
        ],
      },
      {
        test: /\.tsx?$/,
        loader: 'awesome-typescript-loader',
      },
      {
        enforce: 'pre',
        test: /\.js$/,
        loader: 'source-map-loader',
      },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './index.html',
    }),
  ],
  devtool: 'eval-source-map',
  resolve: {
    extensions: ['.js', '.ts', '.tsx'],
  },
};