webpack.config.js

const path = require('path');
const nodeExternals = require('webpack-node-externals');

module.exports = {
  entry: './index.ts',
  mode: 'production',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'index.js',
    libraryTarget: 'umd',
    umdNamedDefine: true,
    globalObject: 'this',
    assetModuleFilename: 'assets/images/[name].[ext]'
  },
  externals: [nodeExternals()],
  module: {
    rules: [
      {
        test: /\.tsx?$/,
        exclude: /node_modules/,
        use: [
          {
            loader: 'babel-loader',
            options: {
              presets: ['@babel/preset-env', '@babel/preset-react'],
            },
          },
          'ts-loader',
        ],
      },
      {
        test: /\.js$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env', '@babel/preset-react'],
          },
        },
      },
      {
        test: /\.(png|jpe?g|gif|svg)$/i,
        use: [
          {
            loader: 'url-loader',
            options: {
              limit: 25000,
              name: '[name].[ext]',
              outputPath: 'assets/images',
              publicPath: '/assets/images',
            },
          },
        ],
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader'],
      },
    ],
  },
  resolve: {
    extensions: ['.js', '.jsx', '.ts', '.tsx'],
  },
};