Lightweight Architectures: With Angular's Signals and Standalone

Transcript

1. @ManfredSteyer Lightweight Architectures With Angular's Signals and Standalone ManfredSteyer
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7. @ManfredSteyer Manfred Steyer
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9. @ManfredSteyer NgModules + EcmaScript Modules import { NgModule } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { AppComponent } from './app.component'; […] @NgModule({ imports: [BrowserModule, OtherModule], declarations: [AppComponent, OtherComponent, OtherDirective], providers: [], bootstrap: [AppComponent], }) export class AppModule {} TypeScript Modules Angular Modules
10. @ManfredSteyer @Component({ standalone: true, imports: [ […], FlightCardComponent, CityPipe, CityValidator, ], selector: 'flight-search', templateUrl: '…' }) export class FlightSearchComponent { […] }
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12. @ManfredSteyer Small and Medium Apps: Folder per Feature
13. @ManfredSteyer Your Public APIs: Barrels // index.ts == Public API export * from './flight-booking.routes';
14. @ManfredSteyer Medium and Large Apps: Folder per Domain
15. @ManfredSteyer Restricting Access b/w Domains, etc. on a library basis
16. @ManfredSteyer Restricting Access on a folder basis Tech Lead Rainer Hahnekamp, AngularArchitects @softarc/eslint-plugin-sheriff
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18. @ManfredSteyer Free eBook ANGULARarchitects.io/standalone Standalone Components Download here:
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20. @ManfredSteyer Zone.js: Monkey Patching After Event Handler: Inform Angular CD Checks Components all components (default) or selected ones (OnPush)
21. @ManfredSteyer Zone.js: Magic Zone.js: ~100K Cannot patch async/await coarse grained CD e.g. Components are always checked as a whole, even if only a tiny fraction changed
22. @ManfredSteyer Signals!
23. @ManfredSteyer Signals!
24. @ManfredSteyer Signal as Producer 4711 Consumer read set notify 4712
25. @ManfredSteyer flights: Flight[] = []; const flights = await this.flightService.findAsPromise(from, to); this.flights = flights; <div *ngFor="let f of flights"> <flight-card [item]="f" /> </div>
26. @ManfredSteyer flights = signal<Flight[]>([]); const flights = await this.flightService.findAsPromise(from, to); this.flights.set(flights); <div *ngFor="let f of flights()"> <flight-card [item]="f" /> </div>
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29. @ManfredSteyer @Injectable({ providedIn: 'root' }) export class FlightBookingFacade { […] private _flights = signal<Flight[]>([]); readonly flights = this._flights.asReadonly(); async load(from: string, to: string) { const flights = await […]; this._flights.set(flights); } }
30. @ManfredSteyer @Injectable({ providedIn: 'root' }) export class FlightBookingFacade { […] private _flights = signal<Flight[]>([]); readonly flights = this._flights.asReadonly(); async load(from: string, to: string) { const flights = await […]; this._flights.set(flights); } }
31. @ManfredSteyer @Injectable({ providedIn: 'root' }) export class FlightBookingFacade { […] private _flights = signal<Flight[]>([]); readonly flights = this._flights.asReadonly(); private _from = signal('Hamburg'); readonly from = this._from.asReadonly(); private _to = signal('Graz'); readonly to = this._to.asReadonly(); […] }
32. @ManfredSteyer @Injectable({ providedIn: 'root' }) export class FlightBookingFacade { […] private state = signal({ from: 'Hamburg', to: 'Graz', flights: [] as Flight[], […] }, { equal }); […] }
33. @ManfredSteyer @Injectable({ providedIn: 'root' }) export class FlightBookingFacade { […] private state = signal({ from: 'Hamburg', to: 'Graz', flights: [] as Flight[], […] }, { equal }); flights = computed(() => this.state().flights, { equal }); from = computed(() => this.state().from, { equal }); […] }
34. @ManfredSteyer @Injectable({ providedIn: 'root' }) export class FlightBookingFacade { […] private state = signal({ from: 'Hamburg', to: 'Graz', flights: [] as Flight[], […] }, { equal }); flights = computed(() => this.state().flights, { equal }); from = computed(() => this.state().from, { equal }); […] } const equal = (a,b) => a === b
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36. @ManfredSteyer select(selector) selectSignal(selector)
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38. @ManfredSteyer @Injectable({ providedIn: 'root' }) export class FlightBookingFacade { private state = signalState({ from: 'Paris', to: 'London', flights: [] as Flight[], basket: {} as Record<number, boolean>, }); flights = this.state.flights; from = this.state.from; […] }
39. @ManfredSteyer @Injectable({ providedIn: 'root' }) export class FlightBookingFacade { […] selected = selectSignal( () => this.flights().filter((f) => this.basket()[f.id]); […] }
40. @ManfredSteyer @Injectable({ providedIn: 'root' }) export class FlightBookingFacade { […] selected2 = selectSignal( this.flights, this.basket, (flights, basket) => flights.filter((f) => basket[f.id]) ); […] }
41. @ManfredSteyer @Injectable({ providedIn: 'root' }) export class FlightBookingFacade { […] updateCriteria(from: string, to: string): void { this.state.$update({ from, to }); } […] }
42. @ManfredSteyer @Injectable({ providedIn: 'root' }) export class FlightBookingFacade { […] updateCriteria(from: string, to: string): void { this.state.$update(state => ({ ...state, from, to })); } […] }
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44. @ManfredSteyer export const FlightBookingStore = signalStore( { providedIn: 'root' }, […] );
45. @ManfredSteyer export const FlightBookingStore = signalStore( { providedIn: 'root' }, withState({ from: 'Paris', to: 'London', […] }), […] );
46. @ManfredSteyer export const FlightBookingStore = signalStore( { providedIn: 'root' }, withState({ from: 'Paris', to: 'London', […] }), withSignals(([…]) => ({ […] })), withMethods(([…]) => ({ })), withHooks({ […] }), withCallState() );
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48. @ManfredSteyer const BooksStore = signalStore( withEntities<Book>({ collection: 'book' }), withEntities<Author>({ collection: 'author' }) );
49. @ManfredSteyer const BooksStore = signalStore( withLoadEntities<Book>(BookService), withLoadEntities<Author>(AuthorService), );
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52. @ManfredSteyer d Slides & Examples Remote Company Workshops and Consulting http://angulararchitects.io