rollup.config.js

// rollup.config.js
import commonjs from "rollup-plugin-commonjs";
import nodeResolve from "rollup-plugin-node-resolve";

export default {
  input: "Boolio.js",
  output: {
    file: "browser.js",
    format: "iife",
    name: "Boolio"
  },
  plugins: [
    nodeResolve({
      jsnext: true,
      main: true
    }),

    commonjs({
      // non-CommonJS modules will be ignored, but you can also
      // specifically include/exclude files
      include: undefined, // "node_modules/**", // Default: undefined
      exclude: undefined, // ["node_modules/foo/**", "node_modules/bar/**"], // Default: undefined
      // these values can also be regular expressions
      // include: /node_modules/

      // search for files other than .js files (must already
      // be transpiled by a previous plugin!)
      extensions: [".js"], // Default: [ '.js' ]

      // if true then uses of `global` won't be dealt with by this plugin
      ignoreGlobal: false, // Default: false

      // if false then skip sourceMap generation for CommonJS modules
      sourceMap: false, // Default: true

      // explicitly specify unresolvable named exports
      // (see below for more details)
      namedExports: undefined, // { "./module.js": ["foo", "bar"] }, // Default: undefined

      // sometimes you have to leave require statements
      // unconverted. Pass an array containing the IDs
      // or a `id => boolean` function. Only use this
      // option if you know what you're doing!
      ignore: undefined // ["conditional-runtime-dependency"]
    })
  ]
};