rollup.config.js

// rollup.config.js

import replace from 'rollup-plugin-replace';
import resolve from 'rollup-plugin-node-resolve';
import cleanup from 'rollup-plugin-cleanup';
import commonjs from 'rollup-plugin-commonjs';

const config = require('./ngr.config.js');

export default {
  entry: './main.prod.js',
  format: 'iife',
  dest: config.build + '/bundle.es2015.js',
  sourceMap: false,
  treeshake: true,
  plugins: [
    replace({ 'ENVIRONMENT': JSON.stringify('production') }),
    commonjs({
      include: 'node_modules/rxjs/**'
    }),
    resolve({
      es2015: true,
      module: true,
      jsnext: true,
      main: true,
      extensions: ['.js', '.json'],
      preferBuiltins: false
    }),
    cleanup()
  ],
  onwarn: function (message) {
    if (/at the top level of an ES module, and has been rewritten/.test(message)) {
      return;
    }
    if(/The final argument to magicString.overwrite/.test(message)) {
      return;
    }
    console.error(message);
  }
}