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/**'
  }),
]

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

const umdConfig = mergeAll([
  configBase,
  {
    output: mergeAll([
      configBase.output,
      {
        file: `dist/${pkg.name}.js`,
        format: 'umd',
        name: 'ContentLoader',
        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,
        }
      })
    )
  }
])

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

export default [devUmdConfig, prodUmdConfig, webConfig]