rollup.config.js

import babel from 'rollup-plugin-babel'
import uglify from 'rollup-plugin-uglify'
import replace from 'rollup-plugin-replace'
import commonjs from 'rollup-plugin-commonjs'
import resolve from 'rollup-plugin-node-resolve'

const config = {
  input: 'modules/index.js',
  name: 'ReactRouterConfig',
  globals: {
    react: 'React',
    'react-router/Switch': 'ReactRouter.Switch',
    'react-router/Router': 'ReactRouter.Router',
    'react-router/Route': 'ReactRouter.Route',
    'react-router/matchPath': 'ReactRouter.matchPath',
  },
  external: [
    'react',
    'react-router/Switch',
    'react-router/Router',
    'react-router/Route',
    'react-router/matchPath',
  ],
  plugins: [
    babel({
      exclude: 'node_modules/**'
    }),
    resolve(),
    commonjs({
      include: /node_modules/
    }),
    replace({
      'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV)
    })
  ]
}

if (process.env.NODE_ENV === 'production') {
  config.plugins.push(uglify())
}

export default config