{"slug":"ericrisco-angular","name":"angular","description":"Use when building, refactoring, or debugging Angular (v20/21+): standalone components, signals, zoneless change detection, @if/@for/@defer control flow, inject() DI, resource()/httpResource(), RxJS interop, NgRx SignalStore, ng CLI. NOT React (that is react), NOT Next.js (that is nextjs), NOT a TypeScript language question (that is typescript).","long_description":"---\nname: angular\ndescription: \"Use when building, refactoring, or debugging Angular (v20/21+): standalone components, signals, zoneless change detection, @if/@for/@defer control flow, inject() DI, resource()/httpResource(), RxJS interop, NgRx SignalStore, ng CLI. NOT React (that is react), NOT Next.js (that is nextjs), NOT a TypeScript language question (that is typescript).\"\ntags: [angular, frontend, web, signals, typescript, spa]\nrecommends: [typescript, testing-web, secure-coding]\norigin: risco\n---\n\n# Angular — Standalone, Signals, Zoneless (Angular 20/21+)\n\n> Build Angular the way it ships in 2026: standalone components, signals as the reactivity model, zoneless change detection, built-in control flow, and `inject()` DI. Treat NgModules, `*ngFor`, and `@Input()` decorators as legacy you only touch to migrate.\n\n## Not this skill\n\n**AngularJS (1.x)** is out of scope entirely — this skill is Angular 2+ only and the APIs do not map.\nRoute elsewhere for **React** → `../react/SKILL.md`; **Next.js App Router** → `../nextjs/SKILL.md`;\n**Vue/Nuxt, Svelte, SolidJS, Astro** → `../vue-nuxt/SKILL.md`, `../svelte/SKILL.md`,\n`../solid-js/SKILL.md`, `../astro/SKILL.md`; a **pure TypeScript language question** (generics,\nnarrowing, tsconfig) with no Angular dimension → `../typescript/SKILL.md`; a **standalone NestJS\nAPI** → `../nestjs/SKILL.md`; a generic Node service → `../nodejs/SKILL.md`; **cross-framework\nPlaywright e2e strategy** → `../testing-web/SKILL.md` / `../e2e-testing/SKILL.md`. Angular Universal\nSSR and Angular's own `ng test` (Vitest) setup stay here.\n\n## Decide first\n\n| Situation | Do this | Why |\n|-----------|---------|-----|\n| Greenfield app / new feature | Zoneless + signals + standalone by default. `ng new` (Angular 21) already excludes Zone.js. | The defaults shipped stable in v20-v21; fight them and you write more code that the framework now does for you. |\n| Brownfield NgModule + decorator app | Migrate incrementally with the schematics in `references/migration.md` (NgModule→standalone, control flow, decorator→signal inputs, Zone.js→zoneless, Karma→Vitest); do not rewrite. Keep Zone.js until you flip it on purpose. | A working app that uses `*ngIf` is not a bug. Churn introduces risk for no user value. |\n| \"View not updating\" complaint | Jump to the change-detection section: signal not read in template, `OnPush` without a signal, or stale Zone.js assumption. | Zoneless means a mutation that no signal observes will never repaint — the fix is structural, not a `detectChanges()` call. |\n\n## The modern baseline\n\nNo NgModules. Bootstrap a standalone root component and configure providers in `app.config.ts`.\n\n```typescript\n// main.ts\nimport { bootstrapApplication } from '@angular/platform-browser';\nimport { App } from './app/app';\nimport { appConfig } from './app/app.config';\n\nbootstrapApplication(App, appConfig);\n```\n\n```typescript\n// app/app.config.ts\nimport { ApplicationConfig, provideZonelessChangeDetection } from '@angular/core';\nimport { provideRouter } from '@angular/router';\nimport { provideHttpClient, withFetch } from '@angular/common/http';\nimport { routes } from './app.routes';\n\nexport const appConfig: ApplicationConfig = {\n providers: [\n provideZonelessChangeDetection(), // no Zone.js; CD driven by signals + events\n provideRouter(routes),\n provideHttpClient(withFetch()),\n ],\n};\n```\n\n- Rule: one `bootstrapApplication` call, providers in `app.config.ts`. Why: NgModule bootstrap (`platformBrowserDynamic().bootstrapModule(AppModule)`) is the legacy path — more files, slower to reason about.\n- Rule: components are `standalone` by default (the `standalone` flag is implied in v20+; do not write `standalone: true` in new code, and never write `standalone: false`). Why: standalone is the framework default now; the flag is noise.\n\n**Bad → Good**\n\n```typescript\n// Bad — NgModule wiring for a single component\n@NgModule({ declarations: [UserCard], imports: [CommonModule], exports: [UserCard] })\nexport class UserCardModule {}\n\n// Good — standalone component imports only what it uses\n@Component({\n selector: 'app-user-card',\n imports: [DatePipe],\n template: `
{{ joined() | date }}
`,\n})\nexport class UserCard {\n joined = input.required();\n}\n```\n\n## Signals as the reactivity model\n\n`signal()` holds state, `computed()` derives it, `effect()` runs side effects, `linkedSignal()` resets writable state when a source changes.\n\n```typescript\nimport { signal, computed, effect, linkedSignal } from '@angular/core';\n\nconst qty = signal(1);\nconst price = signal(9.99);\nconst total = computed(() => qty() * price()); // derived — recomputes lazily\nconst draftQty = linkedSignal(() => qty()); // writable, resets when qty changes\n\neffect(() => console.log('total changed:', total())); // side effect ONLY (logging, DOM, sync)\n```\n\n- Rule: derive with `computed()`, never with `effect()`. Why: an `effect()` that writes a signal to \"compute\" a value creates a hidden dependency graph that loops or fires extra times — `computed()` is pull-based and memoized.\n- Rule: `effect()` is for side effects (logging, `localStorage`, imperative DOM, 3rd-party libs), not for keeping two signals in sync. Why: synced state belongs in `computed()` or `linkedSignal()`.\n\nComponent I/O is signal-based: `input()`, `input.required()`, `output()`, `model()` for two-way.\n\n**Bad → Good**\n\n```typescript\n// Bad — decorator I/O, mutable, no type-safety on required\n@Input() userId!: string;\n@Output() saved = new EventEmitter();\n\n// Good — signal inputs/outputs\nuserId = input.required(); // read as userId()\nsaved = output(); // emit with saved.emit(user)\nname = model(''); // two-way: [(name)]=\"...\"\n```\n\n## Templates: built-in control flow\n\nUse `@if` / `@for` / `@switch` / `@defer`. The legacy `*ngIf` / `*ngFor` / `*ngSwitch` structural directives are deprecated.\n\n```html\n@if (user(); as u) {\n
{{ u.name }}
\n} @else {\n \n}\n\n@for (item of items(); track item.id) {\n
{{ item.label }}
\n} @empty {\n
No items
\n}\n\n@defer (on viewport) {\n \n} @placeholder {\n \n}\n```\n\n- Rule: every `@for` **must** declare `track`. Why: it is required syntax (the template won't compile without it) and it controls DOM reuse — `track item.id` over `track $index` when items have stable identity, or the DOM thrashes on reorder.\n- Rule: reach for `@defer` to lazy-load heavy sub-trees and enable incremental hydration. Why: it ships less JS up front without manual `loadComponent` plumbing.\n\n**Bad → Good**\n\n```html\n\n
{{ item.label }}
\n\n\n@for (item of items(); track item.id) {
{{ item.label }}
}\n```\n\n## Data fetching\n\nDefault to signal-based resources; reach for `HttpClient` + RxJS only when you need streams, cancellation, or operator composition.\n\n```typescript\nimport { httpResource } from '@angular/common/http';\nimport { resource } from '@angular/core';\n\n// httpResource — declarative GET wired to HttpClient; reactive to its URL signal\nusers = httpResource(() => `/api/users?team=${this.team()}`);\n// template: @if (users.isLoading()) {…} @else { @for (u of users.value(); track u.id) {…} }\n// users.error() -> error signal; users.reload() -> refetch\n\n// resource — any async loader (not just HTTP)\nprofile = resource({\n params: () => ({ id: this.userId() }),\n loader: ({ params }) => fetchProfile(params.id),\n});\n```\n\n- Rule: `httpResource()`/`resource()` give you `value()`, `isLoading()`, `error()`, `reload()` for free — prefer them over a manual `subscribe` that you have to clean up. Why: less boilerplate, no leak, refetches automatically when its source signals change.\n- Rule: when you genuinely need a stream (websocket, debounced search, retry/switchMap), keep `HttpClient` + RxJS and bridge to a signal with `toSignal()`. Why: signals are not streams; do not fake backpressure with effects. `references/signals-rxjs.md` has the signals-vs-RxJS decision matrix, `toSignal`/`toObservable` interop recipes, `effect` pitfalls (infinite loops, untracked reads), and `takeUntilDestroyed`.\n\n## DI & services\n\n```typescript\n@Injectable({ providedIn: 'root' })\nexport class UserApi {\n private http = inject(HttpClient); // field initializer — no constructor needed\n list = () => this.http.get('/api/users');\n}\n```\n\n- Rule: inject with `inject()`, not constructor parameters. Why: `inject()` works in field initializers and composes into plain functions (guards, factories); constructor DI is the legacy ergonomic.\n- Rule: `providedIn: 'root'` for app-wide singletons. Why: tree-shakable — unused services drop from the bundle.\n- Rule: HTTP cross-cutting concerns are functional interceptors: `provideHttpClient(withInterceptors([authInterceptor]))`. Why: class interceptors with `HTTP_INTERCEPTORS` are the older multi-provider pattern.\n\n## Routing\n\n```typescript\n// app.routes.ts\nexport const routes: Routes = [\n { path: 'users', loadComponent: () => import('./users/users-list').then(m => m.UsersList) },\n { path: 'users/:id', loadComponent: () => import('./users/user-detail').then(m => m.UserDetail),\n canActivate: [authGuard] },\n];\n\nexport const authGuard: CanActivateFn = () => inject(AuthService).isLoggedIn();\n```\n\nEnable route-bound signal inputs with `withComponentInputBinding()` in `provideRouter`, then read route params as signal inputs:\n\n```typescript\nprovideRouter(routes, withComponentInputBinding());\n// in UserDetail: id = input.required(); // bound from the :id segment\n```\n\n- Rule: lazy-load routes with `loadComponent` (or `loadChildren` with a routes array). Why: smaller initial bundle, no NgModule needed.\n- Rule: guards/resolvers are functions (`CanActivateFn`, `ResolveFn`) using `inject()`. Why: class-based guards are deprecated.\n\n## State\n\n- Local/feature state → a signal service (`@Injectable` holding `signal`/`computed`). Simple, no library.\n- App-wide state → **NgRx SignalStore** (`signalStore`, `withState`, `withComputed`, `withMethods`, `withProps`) — signals-native, pairs cleanly with `resource()`.\n\n```typescript\nexport const CartStore = signalStore(\n { providedIn: 'root' },\n withState({ items: [] as Item[] }),\n withComputed(({ items }) => ({ count: computed(() => items().length) })),\n withMethods((store) => ({ add: (i: Item) => patchState(store, s => ({ items: [...s.items, i] })) })),\n);\n```\n\n- Note: **Signal Forms** is experimental (prototype since Angular 21.0.0-next.2). For production forms use reactive/typed forms (`FormGroup`/`FormControl` with typed values). Why: do not ship a prototype API to users.\n\n## CLI workflow\n\n```bash\nng new my-app # Angular 21: zoneless + standalone + Vitest by default\nng generate component user-card # standalone by default; no --standalone flag needed\nng generate service user-api\nng build # production build\nng test # Vitest (default runner in v21; Karma is deprecated)\nng update @angular/core @angular/cli # version bumps + automated migrations\n```\n\n## Testing\n\nUse Vitest + `TestBed`. Provide zoneless CD in tests and set signal inputs via `componentRef`.\n\n```typescript\nimport { TestBed } from '@angular/core/testing';\nimport { provideZonelessChangeDetection } from '@angular/core';\n\nit('renders the user name', async () => {\n TestBed.configureTestingModule({\n providers: [provideZonelessChangeDetection()],\n });\n const fixture = TestBed.createComponent(UserCard);\n fixture.componentRef.setInput('joined', new Date('2026-01-01'));\n await fixture.whenStable(); // not detectChanges() — let CD settle\n expect(fixture.nativeElement.textContent).toContain('2026');\n});\n```\n\n- Rule: set signal inputs with `fixture.componentRef.setInput('name', value)`, never","tagline":"Use when building, refactoring, or debugging Angular (v20/21+): standalone components, signals, zoneless change detection, @if/@for/@defer control flow, inject() DI, resource()/httpResource(), RxJS interop, NgRx SignalStore, ng CLI. NOT React (that is react), NOT Next.js (that is","category":"research","tags":["angular","frontend","web","signals","typescript","spa","agent-skill"],"author":"ericrisco","verified":false,"attribution":{"status":"registry_indexed","statusLabel":"Registry indexed","shortLabel":"REGISTRY INDEXED","sourceLabel":"recursive skill source sync","sourceDetail":"ericrisco/rsc-harness","creatorName":"ericrisco","creatorUrl":"https://github.com/ericrisco","sourceUrl":"https://github.com/ericrisco/rsc-harness/tree/main/skills/angular","indexedBy":"OpenAgentSkill community index","claimUrl":"https://www.openagentskill.com/skills/ericrisco-angular#claim-this-skill","claimCta":"Claim this skill","trustNote":"This listing was indexed from public sources and is not marked official until a maintainer claim is approved.","publicNote":"Attribution links to the public repository or creator profile. 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