webpack.config.js

const path = require('path')
const UglifyJSPlugin = require('uglifyjs-webpack-plugin')

module.exports = {
  entry: './src/styled-components-ts.ts',
  output: {
    libraryTarget: 'umd',
    filename: 'styled-components-ts.js',
    path: path.join(__dirname, '/lib')
  },

  // Enable sourcemaps for debugging webpack's output.
  devtool: 'source-map',

  resolve: {
    // Add '.ts' and '.tsx' as resolvable extensions.
    extensions: ['.ts', '.tsx', '.js', '.json']
  },

  module: {
    rules: [
      // All files with a '.ts' or '.tsx' extension will be handled by 'awesome-typescript-loader'.
      {
        test: /\.tsx?$/,
        loader: 'awesome-typescript-loader'
      },

      // All output '.js' files will have any sourcemaps re-processed by 'source-map-loader'.
      {
        enforce: 'pre',
        test: /\.js$/,
        loader: 'source-map-loader'
      }
    ]
  },

  plugins: [
    new UglifyJSPlugin()
  ],

  // When importing a module whose path matches one of the following, just
  // assume a corresponding global variable exists and use that instead.
  // This is important because it allows us to avoid bundling all of our
  // dependencies, which allows browsers to cache those libraries between builds.
  externals: {
    react: 'React'
  }
}