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Choose an Angular provider scope by the lifetime and sharing the dependency needs: use application providers for genuinely shared services, route providers for feature-level services, and component or directive providers for isolated subtree state. For reusable libraries, expose a stable token and a consumer-facing provider function rather than requiring applications to depend on internal classes. These boundaries organize dependency visibility and lifetime; they do not sandbox third-party JavaScript.
What an Angular provider boundary controls
Angular dependency injection is hierarchical: when a component or other consumer requests a dependency, Angular resolves it from the applicable injector hierarchy. A provider placed at application, route, or component scope therefore affects where that dependency is available and whether separate parts of the application share an instance. See Angular’s hierarchical dependency injection guide.
That is an architectural boundary, not a security boundary. Injecting a library does not prevent its code from running or accessing browser APIs. Angular warns that third-party APIs that manipulate the DOM may not receive the automatic protections applied to Angular template bindings. Keep DOM interaction narrow and handle untrusted values carefully; see Angular’s security guidance.
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| Scope | Use it for | What it means |
|---|---|---|
| Application | Infrastructure or configuration shared across feature areas | Application-level consumers can use the shared dependency. |
| Route | Services or configuration belonging to a feature | The route injector makes providers available to components, directives, guards, and resolvers associated with that route. |
| Component or directive | Isolated UI or subtree state | The provider can give that component subtree its own service instance; separate subtrees do not share that instance by default. |
Angular documents application and route provider locations in its guide to defining dependency providers, and component-level visibility in its hierarchical DI guide. Choose application scope only when broad sharing and lifetime are intentional. Component scope can isolate state, but creating more instances can use more memory.
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Application scope for shared infrastructure
Register a dependency at application bootstrap when multiple feature areas should use the same service or configuration. This suits genuinely global concerns, not merely a library that happens to be used in more than one place. If separate features need independent state, a single shared instance may create unwanted coupling.
Route scope for feature dependencies
Put a provider on a route when its service or configuration belongs to that feature and should be available throughout the route’s work, including guards and resolvers. This gives the feature a clear scope without making the dependency local to one component.
Component or directive scope for isolated state
Use component or directive providers when a reusable UI component needs its own state or service instance for its subtree. Descendants can resolve the provider, while another instance of the component can have separate state.
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Use runtime tokens for library contracts
TypeScript interfaces describe types at compile time; they are not runtime values that Angular can use as dependency-injection tokens. For an interface-shaped dependency, configuration object, or replaceable implementation, define and export an InjectionToken. Keep the interface as the type contract and use the token as the runtime lookup key. Angular’s dependency provider guide explains provider tokens and configuration values.
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A token’s identity is the token object itself, not the descriptive string supplied when constructing it. Consumers must import the same exported token instance. Creating a second InjectionToken with identical descriptive text does not create an equivalent key.
export interface AnalyticsConfig {
endpoint: string;
}
export const ANALYTICS_CONFIG = new InjectionToken<AnalyticsConfig>(
'analytics.config'
);This example shows the shape of a public contract; the actual configuration fields should reflect what the library supports. Avoid asking consumers to provide private implementation classes when a public token can express the intended extension point.
Give consumers a provider function
A configurable library can export a function such as provideAnalytics(config) that returns the providers needed to set it up. Angular describes this provider-function pattern as a way to encapsulate internal tokens while giving consumers a composable, type-safe configuration surface. The application can call the public function without knowing the library’s internal provider array or implementation classes. See Angular’s provider configuration documentation.
Treat that function and its documented options as the supported integration seam. Exposing private tokens or relying on consumers to copy internal provider lists makes future implementation changes harder to manage.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Handle legacy NgModule providers in standalone applications
If a third-party package still exposes providers through an NgModule, Angular’s importProvidersFrom can collect providers transitively from modules and standalone components. Place the resulting providers in an application or environment injector, such as application bootstrap or a route injector—not in component providers. Check the API against the Angular version installed in your project; the current official pages consulted report Angular v22.2.1. See the importProvidersFrom API reference.
Keep DOM access and untrusted data narrowly controlled
A dependency boundary does not neutralize code inside the dependency. If a third-party library manipulates the DOM, Angular’s template sanitization may not apply to those operations. Prefer passing data through a narrow adapter rather than handing a library raw host elements, avoid treating external HTML as trusted, and apply sanitization appropriate to the context if direct DOM integration is unavoidable. Angular explains the distinction and risks in its security guide.
These practices reduce the amount of application code exposed to DOM-specific behavior; they do not turn Angular DI into a JavaScript sandbox.
Decide whether the dependency should be a separate package
Angular libraries can be reusable code shared locally or distributed as npm packages, helping separate reusable functionality from application business logic. Separate packaging also creates ongoing work to manage, maintain, and update the code. Angular’s library overview discusses both reuse and maintenance considerations.
Before adopting or publishing a package, evaluate whether its public API is stable, whether its supported Angular versions fit your application, how often it is updated, which transitive dependencies it brings, how security notices are handled, and how difficult it would be to replace. These are practical project checks, not a formal scoring system prescribed by Angular.
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Integration checklist
- Identify whether the dependency owns app-wide infrastructure, feature-level behavior, or local UI state.
- Select the narrowest provider scope that supports the required sharing and lifetime.
- Use an exported runtime token for interface-shaped dependencies and non-class values; ensure every consumer imports the same token object.
- For configurable libraries, provide a public provider function instead of exposing private provider details.
- For legacy NgModule providers, use
importProvidersFromonly in an application or environment injector. - Review DOM access, handling of untrusted values, Angular compatibility, package updates, transitive dependencies, and replaceability.
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