rollup.config.js

import nodeResolve from 'rollup-plugin-node-resolve';
import commonjs from 'rollup-plugin-commonjs';
import babel from 'rollup-plugin-babel';
import replace from 'rollup-plugin-replace';
import { uglify } from 'rollup-plugin-uglify';

var env = process.env.NODE_ENV;
var config = {
  input: 'index.js',
  output: {
    file: 'morbido.js',
    format: 'umd',
    name: 'Morbido',
  },
  plugins: [
    nodeResolve(),
    // due to https://github.com/rollup/rollup/wiki/Troubleshooting#name-is-not-exported-by-module
    commonjs({
      include: 'node_modules/**',
      namedExports: { './node_module/invariant.js': ['default'] },
    }),
    babel({
      exclude: 'node_modules/**',
    }),
    replace({
      'process.env.NODE_ENV': JSON.stringify(env),
    }),
  ],
};

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

export default config;