systemjs/rollup.config.js

import nodeResolve from 'rollup-plugin-node-resolve';
import replace from 'rollup-plugin-replace';
import fs from 'fs';

var version = JSON.parse(fs.readFileSync('package.json')).version;

if (process.env.production)
  version += ' Production';
else
  version += ' Dev';

var name = `system${process.env.production ? '-production' : ''}`;

export default {
  entry: `src/${name}.js`,
  format: 'iife',
  dest: `dist/${name}.src.js`,

  sourceMap: true,
  sourceMapFile: `dist/${name}.js.map`,

  banner: `/*
 * SystemJS v${version}
 */`,

  plugins: [
    nodeResolve({
      module: false,
      jsnext: false,
    }),
    replace({
      VERSION: JSON.stringify(version)
    })
  ],

  // skip rollup warnings (specifically the eval warning)
  onwarn: function() {}
};