rollup.config.js

import resolve from 'rollup-plugin-node-resolve'
import commonjs from 'rollup-plugin-commonjs'
import sourceMaps from 'rollup-plugin-sourcemaps'
const pkg = require('./package.json')
const camelCase = require('lodash.camelcase')

const libraryName = 'ts-enums'

export default {
    entry: `compiled/${libraryName}.js`,
    targets: [
        {dest: pkg.main, moduleName: camelCase(libraryName), format: 'umd'},
        {dest: pkg.module, format: 'es'}
    ],
    sourceMap: true,
    // Indicate here external modules you don't wanna include in your bundle (i.e.: 'lodash')
    external: [],
    plugins: [
        // Allow bundling cjs modules (unlike webpack, rollup doesn't understand cjs)
        commonjs(),
        // Allow node_modules resolution, so you can use 'external' to control
        // which external modules to include in the bundle
        // https://github.com/rollup/rollup-plugin-node-resolve#usage
        resolve(),

        // Resolve source maps to the original source
        sourceMaps()
    ]
}