From how to build open source lib - Kent C. Dodds

webpack.config.babel.js

//https://egghead.io/lessons/javascript-add-a-browser-build-to-an-npm-module
import { join } from "path";

export default {
  entry: "./src/index.js",
  output: {
    path: join(__dirname, "dist"),
    libraryTarget: "umd",
    library: "starWarsNames"
},
  devtool: "source-map",
  module: {
    rules: [{ test: /\.js$/, use: "babel-loader" }]
  }
};