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angular-di

Implement Angular v20+ dependency injection with inject(), tokens, and provider configuration.

3|2|Updated Oct 9, 2025
Search Tags:#angular#providers#dependency-injection#inject#injection-tokens#hierarchical-injection#testing-di
One-click install
npx skills add https://github.com/ngx-signal-forms/ngx-signal-forms --skill angular-di-ngx-signal-forms
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: angular-di
Source: https://github.com/ngx-signal-forms/ngx-signal-forms/tree/main/.github/skills/angular-di
Command: npx skills add https://github.com/ngx-signal-forms/ngx-signal-forms --skill angular-di-ngx-signal-forms

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Angular DI in v20+ and beyond can be verbose and error-prone; this Skill provides structured patterns using inject(), tokens, and provider configuration to reliably manage dependencies and scopes.

Core Features & Use Cases

  • Use inject() over constructors for explicit DI at runtime, enabling dynamic service provisioning and more flexible testing.
  • Define and consume InjectionToken-based providers for runtime-configurable values and platform-specific implementations.
  • Employ hierarchical and scoped providers (root, component, route) to control singleton vs per-instance lifecycles; implement multi-token patterns and testing utilities.

Quick Start

Create a simple service that uses inject() to obtain HttpClient and configure an InjectionToken for API_BASE, then consume them in a component.

Frequently Asked Questions about angular-di

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

FAQPage Schema
How do I use inject() instead of constructor injection in Angular v20+?▼

Angular dependency injection with inject() replaces constructor parameters by allowing explicit runtime DI in services or components. You call inject() within field initializers or factory contexts to obtain HttpClient instances and dynamically provision services.

What is hierarchical injection and how do providers control service scope in Angular?▼

Hierarchical injection manages singleton versus per-instance lifecycles across root, component, and route levels. Provider configuration at these scopes determines whether Angular creates one shared service instance or fresh instances for each component or route subtree.

How do I configure InjectionToken providers for runtime values in Angular?▼

InjectionToken configuration defines strongly-typed, runtime-configurable values like API_BASE URLs. You declare tokens with factory providers and consume them via inject(), enabling platform-specific implementations without hardcoding values directly into service constructors.

Does this Angular DI pattern support multi-token providers and testing utilities?▼

Angular DI supports multi-token patterns for registering multiple provider values under a single token and testing utilities for mocking dependencies. You configure multi providers to aggregate plugin instances and override injections in test beds reliably.

What's the best way to handle dependency injection scope management for route-level providers in Angular?▼

Route-level provider configuration in Angular restricts service lifecycles to specific navigation subtrees. By configuring providers in route definitions, you ensure dependencies are instantiated per route segment and disposed when navigating away, preventing memory leaks.

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