import { readFileSync } from 'fs'; import config from './rollup.config.js'; config.plugins.push({ load: function ( id ) { if ( ~id.indexOf( 'fs.js' ) ) return readFileSync( 'browser/fs.js' ).toString(); if ( ~id.indexOf( 'es6-promise' ) ) return readFileSync( 'browser/promise.js' ).toString(); } }); config.format = 'umd'; export default config;