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.md
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('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.tsproviders array over importing NgModules. - Factories: Use
useFactorystrictly when dependencies need runtime configuration. - App Initializer: Use provideAppInitializer(() => inject(ConfigService).load()) (Angular 19+) to run async code before app bootstrap — replaces old
APP_INITIALIZERtoken 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:
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HTTP_INTERCEPTORS
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before app bootstrap
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class fields or constructor-equivalent
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collects all multi providers
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inject(MyService)
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provideHttpClient()
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providers: [MyService]
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route config
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Additional task-grounded exact anchors: inject(API_URL)
Files
3- SKILL.md
cfe820eb772.5 KB - evals/evals.json
f6638003ae4.1 KB - references/di-patterns.md
7801f7a2fc674 B
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