Angular, Lazy Loading, ngVikings in Copenhagen, Feb 2017

Transcript

1. Improving Start-up Performance with Lazy Loading in Angular 2 Manfred Steyer SOFTWAREarchitekt.at ManfredSteyer
2. About me … • Manfred Steyer • SOFTWAREarchitekt.at • Trainer & Consultant • Focus: Angular • Google Developer Expert (GDE) Page  2 Manfred Steyer
3. Contents • Lazy Loading • Preloading • Prevent Lazy Loading • Shared Modules and Lazy Loading Page  3
4. Lazy Loading Page  4
5. Module Structure Page  5 AppModule … … … SharedModule Root Module Feature Modules Shared Module
6. Lazy Loading Page  6 AppModule … … … SharedModule Root Module Feature Modules Shared Module
7. Root Module with Lazy Loading Page  7 const APP_ROUTE_CONFIG: Routes = [ { path: 'home', component: HomeComponent }, { path: 'flights', loadChildren: './[…]flight-booking.module#FlightBookingModule' } ];
8. Routes for Feature Module Page  8 const FLIGHT_ROUTES = [ { path: '/bookings', component: FlightBookingComponent, […] }, […] } Url: /flights/bookings Triggers Lazy Loading
9. webpack configuration • angular2-router-loader • creates several chunks Page  9
10. DEMO Page  10
11. Preloading Page  11
12. Idea • Modules that might be needed later are loaded after (!) the start of the application • When the module is actually needed, it is available immediately Page  12
13. Activating Preloading Page  13 const AppRoutesModule = RouterModule.forRoot( ROUTE_CONFIG, { preloadingStrategy: PreloadAllModules });
14. DEMO Page  14
15. Lazy Loading and Shared Modules Page  22
16. DEMO Page  23
17. Lazy Loading and Shared Modules Page  24 AppModule FlightModule SharedModule includes includes (lazy) includes AuthService
18. Lazy Loading and Shared Modules Page  25 AppModule FlightModule SharedModule includes includes (lazy) includes AuthService AuthService
19. Lazy Loading and Shared Modules Page  26 AppModule FlightModule SharedModule includes includes (lazy) includes AuthService AuthService
20. Solution Page  27 AppModule FlightModule SharedModule includes (lazy) includes CoreModule includes includes Only import CoreModule into AppModule! Global Providers like AuthService & Shell
21. DEMO
22. Huge CoreModule? Page  29 AppModule FlightModule SharedModule includes (lazy) includes CoreModule includes includes
23. Solution (for Libraries) Page  30 AppModule FlightModule AuthModule includes (lazy) CoreModule
24. Solution (for Libraries) Page  31 AppModule FlightModule AuthModule includes (lazy) includes (with Services) CoreModule includes includes (without Services)
25. Auth Module Page  32 @NgModule({ […], providers: [] }) export class AuthModule { }
26. Auth Module Page  33 @NgModule({ […], providers: [] }) export class AuthModule { static forRoot(): ModuleWithProviders { return { ngModule: AuthModule, providers: [AuthService, […]] } } }
27. DEMO Page  34
28. Summary Page  35 Lazy Loading of Modules webpack splits chunks Prevent Lazy Loading with Guards Preloading Strategy Use Core Module for global Services Shared Modules w/ and w/o Providers
29. Contact [mail] manfred.steyer@SOFTWAREarchitekt.at [blog] SOFTWAREarchitekt.at [twitter] ManfredSteyer