How to bundle Angular 2 Typescript app using Gulp and SystemJS?

var gulp = require('gulp');var sourcemaps = require('gulp-sourcemaps');var concat = require('gulp-concat');var typescript = require('gulp-typescript');var systemjsBuilder = require('systemjs-builder');// Compile TypeScript app to JSgulp.task('compile:ts', function () {  return gulp    .src([        "appTS/**/*.ts",        "typings/*.d.ts"    ])    .pipe(sourcemaps.init())    .pipe(typescript({        "module": "system",        "moduleResolution": "node",        "outDir": "app",        "target": "ES5"    }))    .pipe(sourcemaps.write('.'))    .pipe(gulp.dest('app'));});// Generate systemjs-based bundle (app/app.js)gulp.task('bundle:app', function() {  var builder = new systemjsBuilder('public', './system.config.js');  return builder.buildStatic('app', 'app/app.js');});// Copy and bundle dependencies into one file (vendor/vendors.js)// system.config.js can also bundled for conveniencegulp.task('bundle:vendor', function () {    return gulp.src([        'node_modules/zone.js/dist/zone.js',        'node_modules/reflect-metadata/Reflect.js',        'node_modules/systemjs/dist/system-polyfills.js',        'node_modules/core-js/client/shim.min.js',        'node_modules/systemjs/dist/system.js',        'system.config.js',      ])        .pipe(concat('vendors.js'))        .pipe(gulp.dest('vendor'));});// Copy dependencies loaded through SystemJS into dir from node_modulesgulp.task('copy:vendor', function () {    return gulp.src([        'node_modules/rxjs/bundles/Rx.js',        'node_modules/@angular/**/*'    ])    .pipe(gulp.dest('vendor'));});gulp.task('vendor', ['bundle:vendor', 'copy:vendor']);gulp.task('app', ['compile:ts', 'bundle:app']);// Bundle dependencies and app into one file (app.bundle.js)gulp.task('bundle', ['vendor', 'app'], function () {    return gulp.src([        'app/app.js',        'vendor/vendors.js'        ])    .pipe(concat('app.bundle.js'))    .pipe(uglify())    .pipe(gulp.dest('./app'));});gulp.task('default', ['bundle']);