rollup.umd.config.js

import config from "./rollup.config.js";
import uglify from "rollup-plugin-uglify";

const env = process.env.NODE_ENV;

const umdConfig = Object.assign({}, config, {
  output: Object.assign({}, config.output, {
    format: "umd",
    name: "DatePicker"
  }),
  globals: {
    react: "React",
    "prop-types": "PropTypes",
    "react-onclickoutside": "onClickOutside",
    "react-popper": "ReactPopper",
    classnames: "classNames"
  }
});

if (env === "production") {
  config.plugins.push(
    uglify({
      compress: {
        pure_getters: true,
        unsafe: true,
        unsafe_comps: true,
        warnings: false
      }
    })
  );
}

export default umdConfig;