webpack.config.js

// @flow
const path = require('path');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const CopyPlugin = require('copy-webpack-plugin');
const CssMinimizerPlugin = require('css-minimizer-webpack-plugin');

module.exports = {
  entry: {
    app: './src/index.ts',
    styles: './src/scss/index.scss',
  },
  mode: 'development',
  devtool: 'inline-source-map',
  devServer: {
    contentBase: './dist',
  },
  module: {
    rules: [
      {
        test: /\.ts?$/,
        use: 'ts-loader',
        exclude: /node_modules/,
      },
      {
        test: /.scss$/,
        use: [
          {
            loader: 'file-loader',
            options: {
              name: '[name].css',
              outputPath: 'css/',
            },
          },
          {
            loader: 'extract-loader',
          },
          {
            loader: 'css-loader',
          },
          {
            loader: 'sass-loader',
          },
        ],
      },
    ],
  },
  resolve: {
    extensions: ['.ts', '.js'],
    alias: {
      lib: path.resolve(__dirname, 'src/lib/'),
    },
  },
  optimization: {
    usedExports: true,
    minimize: true,
    minimizer: [new CssMinimizerPlugin()],
  },
  output: {
    filename: '[name].bundle.js',
    path: path.resolve(__dirname, 'dist'),
  },
  plugins: [
    new CleanWebpackPlugin({ cleanStaleWebpackAssets: false }),
    new CopyPlugin({
      patterns: ['./public/index.html'],
    }),
  ],
};