angular-cli-build if you want more control over your files

angular-cli-build.js

/* global require, module */

var Angular2App = require('angular-cli/lib/broccoli/angular2-app');

const vendorNpmFiles = [
  'systemjs/dist/system-polyfills.js',
  'systemjs/dist/system.src.js',
  'zone.js/dist/**/*.+(js|js.map)',
  'es6-shim/es6-shim.js',
  'reflect-metadata/**/*.+(js|js.map)',
  'rxjs/**/*.+(js|js.map)',
  '@angular/**/*.+(js|js.map)',
  '@angular2-material/**/*.js'
]

const polyfills = [
  'vendor/es6-shim/es6-shim.js',
  'vendor/reflect-metadata/Reflect.js',
  'vendor/systemjs/dist/system.src.js',
  'vendor/zone.js/dist/zone.js'
]

module.exports = function (defaults) {
  return new Angular2App(defaults, { vendorNpmFiles, polyfills });
};