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angular-di

Establish Angular dependency injection patterns with inject(), provider scopes, and typed InjectionTokens.

1|1|Updated Apr 20, 2026
Search Tags:#angular#dependency injection#providers#inject()#app initialization#injection tokens#route configuration
One-click install
npx skills add https://github.com/svssdeva/agentic-skills --skill angular-di-svssdeva
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: angular-di
Source: https://github.com/svssdeva/agentic-skills/tree/main/angular/angular-di
Command: npx skills add https://github.com/svssdeva/agentic-skills --skill angular-di-svssdeva

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Angular dependency injection can become inconsistent and hard to scale when services, scopes, and tokens are not designed up front, leading to duplicated instances, tangled dependencies, and brittle configuration.

Core Features & Use Cases

  • Modern injection with inject(): Prefer inject() over constructor injection to keep components/services lean and more flexible.
  • Correct provider scoping: Use providedIn: 'root', component-level providers, and route-level providers to control instance lifetimes.
  • Injection tokens for configurable dependencies: Create typed tokens (including factory-based and value-based tokens) to decouple implementation from configuration.
  • Provider configuration patterns: Choose between useClass, useValue, useFactory, and useExisting, including multi providers for arrays and interceptors.
  • Advanced DI controls: Apply optional injection, self/skipSelf/host resolution, and run code inside an injection context using runInInjectionContext.
  • App initialization & environment injectors: Load async configuration before the app starts with provideAppInitializer, and create injectors programmatically with createEnvironmentInjector.

Quick Start

Configure your Angular app to use inject() with properly scoped providers and typed InjectionTokens for API and feature configuration.

Frequently Asked Questions about angular-di

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I configure Angular dependency injection using inject() instead of constructor injection?▼

Angular dependency injection uses the inject() function to retrieve dependencies directly within component or service properties, replacing constructor parameters to keep classes lean and flexible during application bootstrapping.

When should I use root, component, or route-level providers in Angular?▼

Angular provider scopes control instance lifetimes: use providedIn root for singletons, component-level providers for isolated instances, and route-level providers to manage dependency injection scope during specific route navigation.

How do I create typed InjectionTokens for configurable dependencies in Angular?▼

Angular InjectionTokens decouple implementation from configuration by defining typed tokens using useValue or useFactory, allowing configurable dependencies to be injected cleanly across components without hardcoding service implementations.

What is the best way to set up multi-provider arrays like HTTP interceptors in Angular?▼

Angular HTTP interceptors use multi-provider configuration patterns by combining useClass, useValue, useFactory, or useExisting with multi: true, generating an array of injectable providers processed sequentially during route configuration.

How do I load async configuration before Angular app initialization?▼

Angular app initialization defers startup until async configuration completes by using provideAppInitializer, loading required environment data before route configuration and dependency injection resolution occurs.

Does Angular support advanced dependency injection controls like optional injection and self/skipSelf resolution?▼

Angular dependency injection supports advanced resolution controls including optional injection, self/skipSelf/host modifiers, and runInInjectionContext to programmatically manage provider lookup boundaries and environment injectors.

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