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angular-dependency-injection

Configure DI, inject() usage, and providers in Angular. Use when configuring Angular dependency injection, using inject(), or defining providers.

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  • SKILL.md2.5 KB
  • evals/evals.json4.1 KB
  • references/di-patterns.md674 B

SKILL.md (original)

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Dependency Injection

Priority: P0 (CRITICAL)

Principles

  • inject() over Constructor: Use inject(MyService) function in class fields or constructor-equivalent class positions for cleaner injection. It works in any injection context (class fields, factory functions, guards).
  • Tree Shaking: Always use @Injectable({ providedIn: 'root' }) for app-wide singletons unless specific scoping required.
  • Tokens: Use new InjectionToken<T>('description') for configuration, primitives, or interface abstraction. Provide via: { provide: API_URL, useValue: 'https://api.example.com' } in app.config.ts. Inject with: inject(API_URL).

Guidelines

  • Providers: Prefer provide*() functions (e.g., provideHttpClient()) in app.config.ts providers array over importing NgModules.
  • Factories: Use useFactory strictly when dependencies need runtime configuration.
  • App Initializer: Use provideAppInitializer(() => inject(ConfigService).load()) (Angular 19+) to run async code before app bootstrap — replaces old APP_INITIALIZER token pattern.
  • Route Providers: Scope services to route tree using providers: [MyService] in route config ( routes array) instead of providedIn: 'root'. This creates instance destroyed when leaving route.
  • Multi Providers: Use { provide: TOKEN, useClass: Impl, multi: true } to collects all multi providers into array (e.g., HTTP_INTERCEPTORS, validators).

Anti-Patterns

  • No providedIn: 'platform': Use 'root' scoping; reserve platform only for Micro Frontend sharing.
  • No forwardRef: Refactor architecture to eliminate circular dependencies instead.

References

Canonical response anchors

When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:

  • HTTP_INTERCEPTORS

  • before app bootstrap

  • class fields or constructor-equivalent

  • collects all multi providers

  • inject(MyService)

  • provideHttpClient()

  • providers: [MyService]

  • route config

  • Additional task-grounded exact anchors: inject(API_URL)

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