Lightweight Architectures: With Angular's Signals and Standalone

@ManfredSteyer Lightweight Architectures With Angular's Signals and Standalone ManfredSteyer

@ManfredSteyer

@ManfredSteyer Manfred Steyer

@ManfredSteyer

@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

@ManfredSteyer @Component({ standalone: true, imports: [ […], FlightCardComponent, CityPipe, CityValidator,
], selector: 'flight-search', templateUrl: '…' }) export class FlightSearchComponent { […] }

@ManfredSteyer

@ManfredSteyer Small and Medium Apps: Folder per Feature

@ManfredSteyer Your Public APIs: Barrels // index.ts == Public API
export * from './flight-booking.routes';

@ManfredSteyer Medium and Large Apps: Folder per Domain

@ManfredSteyer Restricting Access b/w Domains, etc. on a library basis

@ManfredSteyer Restricting Access on a folder basis Tech Lead Rainer
Hahnekamp, AngularArchitects @softarc/eslint-plugin-sheriff

@ManfredSteyer

@ManfredSteyer Free eBook ANGULARarchitects.io/standalone Standalone Components Download here:

@ManfredSteyer

@ManfredSteyer Zone.js: Monkey Patching After Event Handler: Inform Angular CD
Checks Components all components (default) or selected ones (OnPush)

@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

@ManfredSteyer Signals!

@ManfredSteyer Signal as Producer 4711 Consumer read set notify 4712

@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>

@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>

@ManfredSteyer

@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); } }

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(); […] }

private state = signal({ from: 'Hamburg', to: 'Graz', flights: [] as Flight[], […] }, { equal }); […] }

private state = signal({ from: 'Hamburg', to: 'Graz', flights: [] as Flight[], […] }, { equal }); flights = computed(() => this.state().flights, { equal }); from = computed(() => this.state().from, { equal }); […] }

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

@ManfredSteyer

@ManfredSteyer select(selector) selectSignal(selector)

@ManfredSteyer

@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; […] }

selected = selectSignal( () => this.flights().filter((f) => this.basket()[f.id]); […] }

selected2 = selectSignal( this.flights, this.basket, (flights, basket) => flights.filter((f) => basket[f.id]) ); […] }

updateCriteria(from: string, to: string): void { this.state.$update({ from, to }); } […] }

updateCriteria(from: string, to: string): void { this.state.$update(state => ({ ...state, from, to })); } […] }

@ManfredSteyer

@ManfredSteyer export const FlightBookingStore = signalStore( { providedIn: 'root' },
[…] );

withState({ from: 'Paris', to: 'London', […] }), […] );

withState({ from: 'Paris', to: 'London', […] }), withSignals(([…]) => ({ […] })), withMethods(([…]) => ({ })), withHooks({ […] }), withCallState() );

@ManfredSteyer

@ManfredSteyer const BooksStore = signalStore( withEntities<Book>({ collection: 'book' }), withEntities<Author>({
collection: 'author' }) );

@ManfredSteyer const BooksStore = signalStore( withLoadEntities<Book>(BookService), withLoadEntities<Author>(AuthorService), );

@ManfredSteyer

@ManfredSteyer d Slides & Examples Remote Company Workshops and Consulting
http://angulararchitects.io

Lightweight Architectures: With Angular's Signa...

Lightweight Architectures: With Angular's Signals and Standalone

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