@rocketsofawesome/mirage/rollup.config.js

// node-resolve will resolve all the node dependencies
import resolve from 'rollup-plugin-node-resolve';
import commonjs from 'rollup-plugin-commonjs';
import babel from 'rollup-plugin-babel';
import alias from 'rollup-plugin-alias';
import replace from 'rollup-plugin-replace';
import path from 'path';
import fs from 'fs';

const dependencies = Object.keys(require('./package.json').dependencies)
const appDirectory = fs.realpathSync(process.cwd());
const resolveApp = relativePath => path.resolve(appDirectory, relativePath);

export default [
  {
    input: 'src/index.js',
    output: {
      file: 'dist/bundle.main.js',
      format: 'umd',
      name: 'Mirage',
      globals: {
        react: 'React',
        'prop-types': 'PropTypes',
        'styled-components': 'styled'
      }
    },
    // All the used libs needs to be here
    external: dependencies,
    plugins: [

      resolve(),
      babel({
        exclude: 'node_modules/**'
      }),
      alias({
        SRC: resolveApp('src'),  // Will check for ./bar.jsx and ./bar.js
        resolve: ['.js', '/index.js'] ,
      }),
      commonjs({
        include: 'node_modules/**',
        exclude: ['node_modules/react', 'node_modules/react-dom'],
        namedExports: {
          // left-hand side can be an absolute path, a path
          // relative to the current directory, or the name
          // of a module in node_modules
          'react-sizeme': [ 'withSize' ]
        }
      })
    ]
  },
  {
    input: 'src/index.js',
    output: {
      file: 'dist/bundle.module.js',
      format: 'cjs'
    },
    // All the used libs needs to be here
    external: dependencies,
    plugins: [
      resolve(),
      babel({
        exclude: 'node_modules/**'
      }),
      alias({
        SRC: resolveApp('src'),  // Will check for ./bar.jsx and ./bar.js
        resolve: ['.js', '/index.js'] ,
      }),
    ]
  }
]