webpack.common.js

const HtmlWebpackPlugin = require('html-webpack-plugin');
const CopyWebpackPlugin = require('copy-webpack-plugin');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');

module.exports = {
  entry: {
    main: './src/main.ts',
    style: './src/style.scss',
    polyfills: './src/polyfills.ts',
  },
  module: {
    rules: [
      {
        test: /\.ts$/,
        use: [
          {
            loader: 'babel-loader',
            options: {
              presets: ['@babel/preset-env']
            },
          },
          {
            loader: 'ts-loader',
          },
        ],
        exclude: /node_modules/,
      },
      {
        test: /\.s[ac]ss$/i,
        use: [
          'style-loader',
          'css-loader',
          'sass-loader',
        ],
      },
    ],
  },
  plugins: [
    new CleanWebpackPlugin(),
    new HtmlWebpackPlugin({
      template: './src/index.html',
    }),
    new CopyWebpackPlugin([
      { from: './src/assets', to: 'assets' },
      { from: './src/favicon.png', to: 'favicon.png' },
    ]),
  ],
  resolve: {
    extensions: [ '.tsx', '.ts', '.js' ],
  },
};