rollup.config.js

import babel from 'rollup-plugin-babel'
import commonjs from 'rollup-plugin-commonjs'
import external from 'rollup-plugin-peer-deps-external'
import postcss from 'rollup-plugin-postcss'
import resolve from 'rollup-plugin-node-resolve'
import url from 'rollup-plugin-url'
import pkg from './package.json'

const deps = Object.keys(pkg.dependencies || {})

export default {
  input: 'src/index.js',
  output: [
    {
      file: pkg.main,
      format: 'cjs',
      sourcemap: true
    },
    {
      file: pkg.module,
      format: 'es',
      sourcemap: true
    }
  ],
  external: ['stream', 'crypto', 'path', 'util'].concat(deps),
  plugins: [
    external({}),
    postcss(),
    url(),
    babel({
      exclude: 'node_modules/**',
      plugins: ['external-helpers']
    }),
    resolve(),
    commonjs({
      namedExports: {
        [require.resolve('react-is')]: ['isValidElementType', 'ForwardRef']
      }
    })
  ]
}