rollup.config.js

import babel from 'rollup-plugin-babel';
import replace from 'rollup-plugin-replace';
import uglify from 'rollup-plugin-uglify';
import pkg from './package.json';

const mergeAll = objs => Object.assign({}, ...objs);

const commonPlugins = [
  babel({
    exclude: 'node_modules/**',
    plugins: ['external-helpers'],
  }),
];

const configBase = {
  input: 'src/index.js',
  external: [
    ...Object.keys(pkg.dependencies || {}),
    ...Object.keys(pkg.peerDependencies || {}),
  ],
  plugins: commonPlugins,
};

const umdConfig = mergeAll([
  configBase,
  {
    output: {
      file: `dist/${pkg.name}.js`,
      format: 'umd',
      name: 'FlipMove',
      globals: {
        react: 'React',
        'react-dom': 'ReactDOM',
      },
    },
    external: Object.keys(pkg.peerDependencies || {}),
  },
]);

const devUmdConfig = mergeAll([
  umdConfig,
  {
    plugins: umdConfig.plugins.concat(
      replace({
        'process.env.NODE_ENV': JSON.stringify('development'),
      }),
    ),
  },
]);

const prodUmdConfig = mergeAll([
  umdConfig,
  {
    output: mergeAll([
      umdConfig.output,
      { file: umdConfig.output.file.replace(/\.js$/, '.min.js') },
    ]),
  },
  {
    plugins: umdConfig.plugins.concat(
      replace({
        'process.env.NODE_ENV': JSON.stringify('production'),
      }),
      uglify({
        compress: {
          pure_getters: true,
          unsafe: true,
          unsafe_comps: true,
          warnings: false,
        },
      }),
    ),
  },
]);

const webConfig = mergeAll([
  configBase,
  {
    output: [
      { file: pkg.module, format: 'es' },
      { file: pkg.main, format: 'cjs' },
    ],
  },
]);

export default [devUmdConfig, prodUmdConfig, webConfig];