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Angular 2 - Bootstrap Empty module in angular 2
Start
  An empty module 
import { NgModule } from '@angular/core';

@NgModule({
  declarations: [], // components your module owns.
  imports: [], // other modules your module needs.
  providers: [], // providers available to your module.
  bootstrap: [] // bootstrap this root component.
})
export class MyModule {}

This is an empty module containing no declarations, imports, providers, or components to bootstrap. Use this a reference.
  Application Root Module 
import { NgModule }      from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';

import { AppComponent }  from './app.component';

@NgModule({
  imports: [ BrowserModule ],
  declarations: [ AppComponent ],
  bootstrap:    [ AppComponent ]
})
export class AppModule { }
  Bootstrapping your module 
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { MyModule }               from './app.module';

platformBrowserDynamic().bootstrapModule( MyModule );

In this example, MyModule is the module containing your root component. By bootstrapping MyModule your Angular 2 app is ready to go.
  A module with networking on the web browser. 
// app.module.ts

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { HttpModule } from '@angular/http';
import { MyRootComponent } from './app.component';

@NgModule({
  declarations: [MyRootComponent],
  imports: [BrowserModule, HttpModule],
  bootstrap: [MyRootComponent]
})
export class MyModule {}

MyRootComponent is the root component packaged in MyModule. It is the entry point to your Angular 2 application.
  Static bootstrapping with factory classes

We can statically bootstrap an application by taking the plain ES5 Javascript output of the generated factory classes. Then we can use that output to bootstrap the application:

import { platformBrowser } from '@angular/platform-browser';
import { AppModuleNgFactory } from './main.ngfactory';

// Launch with the app module factory.
platformBrowser().bootstrapModuleFactory(AppModuleNgFactory);

This will cause the application bundle to be much smaller, because all the template compilation was already done in a build step, using either ngc or calling its internals directly.

 

Read Article
https://develop.horje.com/learn/1434/reference

 

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