webpack.config.js

const path = require('path');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const TerserPlugin = require('terser-webpack-plugin')

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

module.exports = {
  mode: isProduction ? 'production' : 'development',
  entry: './theme/scripts/index.ts',
  module: {
    rules: [
      {
        test: /\.js$/,
        enforce: 'pre',
        use: ['source-map-loader'],
      },
      {
        test: /\.ts/,
        use: 'ts-loader',
        exclude: /node_modules/,
      },
      {
        test: /\.scss/,
        use: [MiniCssExtractPlugin.loader, 'css-loader', 'postcss-loader', 'sass-loader'],
      },
    ],
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: 'index.css',
    })
  ],
  resolve: {
    extensions: ['.ts', '.js'],
  },
  optimization: {
    minimizer: [new TerserPlugin({
      extractComments: false,
    })],
  },
  output: {
    filename: 'index.js',
    path: path.resolve(__dirname, 'theme/assets'),
  },
};