rollup.config.js

import resolve from 'rollup-plugin-node-resolve'
import uglify from 'rollup-plugin-uglify'
import replace from 'rollup-plugin-replace'
import babel from 'rollup-plugin-babel'
import alias from 'rollup-plugin-alias'
import cjs from 'rollup-plugin-commonjs'
import path from 'path'
import { rollup as lernaAliases } from 'lerna-alias'

const pkg = require(path.resolve(process.cwd(), './package.json'))

const basePlugins = [
  cjs({ exclude: [path.join(__dirname, 'packages', '*/src/**/*')] }),
  resolve(),
  babel({
    presets: [
      [
        '@babel/env',
        {
          loose: true,
          modules: false,
          exclude: ['transform-typeof-symbol']
        }
      ],
      '@babel/stage-0',
      '@babel/react',
      '@babel/flow'
    ],
    plugins: ['codegen', 'closure-elimination'],
    babelrc: false
  })
]

const baseConfig = {
  input: './src/index.js',
  exports: 'named',
  sourcemap: true
}

const baseExternal = ['react', 'prop-types', 'preact']

const mainConfig = Object.assign({}, baseConfig, {
  external: baseExternal.concat([
    'emotion',
    'emotion-utils',
    'hoist-non-react-statics',
    'stylis-rule-sheet'
  ]),
  plugins: basePlugins,
  output: [
    { file: pkg.main, format: 'cjs' },
    { file: pkg.module, format: 'es' }
  ]
})

const umdConfig = Object.assign({}, baseConfig, {
  plugins: [alias(lernaAliases())].concat(basePlugins).concat(
    replace({
      'process.env.NODE_ENV': JSON.stringify('production')
    }),
    uglify()
  ),
  output: [
    {
      file: './dist/emotion.umd.min.js',
      format: 'umd',
      name: pkg.name
    }
  ],
  globals: { react: 'React', 'prop-types': 'PropTypes', preact: 'preact' },
  external: baseExternal
})

export default [mainConfig, umdConfig]