Modern Angular Fundamentals

When to Use

• Registering providers (providedIn, providers: [...], provideXxx()) in any app, route, or component injector
• Choosing a provider scope (root singleton, route/lazy scope, component instance)
• Defining InjectionToken-based configuration and provideXxx(config) library APIs
• Setting up environment.ts files, build-time file replacement, or runtime config loaded at bootstrap
• Adopting standalone components, inject(), signals, strict null checks, or DestroyRef/takeUntilDestroyed teardown in new code

Core Principles