webpack.config.js

const path = require('path');

const reactExternal = {
    root: 'React',
    commonjs2: 'react',
    commonjs: 'react',
    amd: 'react',
};
const reactDOMExternal = {
    root: 'ReactDOM',
    commonjs2: 'react-dom',
    commonjs: 'react-dom',
    amd: 'react-dom',
};

module.exports = {
    target: 'web',
    devtool: 'source-map',
    externals: {
        react: reactExternal,
        'react-dom': reactDOMExternal,
    },
    entry: './src/index.ts',
    mode: 'production',
    output: {
        path: path.resolve(__dirname, 'dist'),
        filename: 'index.js',
        libraryTarget: 'commonjs',
    },
    module: {
        rules: [
            {
                test: /\.tsx?$/,
                use: 'ts-loader',
                exclude: /node_modules/,
            },
        ],
    },
    resolve: {
        extensions: ['.ts', '.tsx', '.js'],
    },
};