Canonical Rollup Configuration

rollup.config.js

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

import pkg from './package.json';

export default [{
  input : './index.js',
  output: [
    {
      name: 'bundle',
      file: pkg.browser,
      format: 'umd'
    }
  ],
  plugins: [
    resolve(),
    babel({
      presets: [
        [
          "env", {
            "targets": {
              "browsers": ["last 2 versions", "safari >= 7"]
            },
            "modules": false
          }
        ],
        "stage-1"
      ],
      plugins: ["external-helpers"]
    }),
    commonjs()
  ]
}, {
  input : './index.js',
  output: [
    {
      name: 'bundle',
      file: pkg.browser.replace( '.js', '.min.js' ),
      format: 'umd'
    }
  ],
  plugins: [
    resolve(),
    babel({
      presets: [
        [
          "env", {
            "targets": {
              "browsers": ["last 2 versions", "safari >= 7"]
            },
            "modules": false
          }
        ],
        "stage-1"
      ],
      plugins: ["external-helpers"]
    }),
    commonjs(),
    uglify()
  ]
}, {
  input: './index.js',
  external: (id) => !!id.match(/^babel-runtime/i),
  output: [
    {
      file: pkg.main,
      format: 'cjs'
    }, {
      file: pkg.module,
      format: 'es'
    }
  ],
  plugins: [
    resolve(),
    babel({
      runtimeHelpers: true,
      presets: [
        [
          "env", {
            "targets": {
              "browsers": ["last 2 versions", "safari >= 7"]
            },
            "modules": false
          }
        ],
        "stage-1"
      ],
      plugins: ["transform-runtime"]
    }),
    commonjs()
  ]
}];