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Angular · Concept

Lazy loading

Angular's injectAsync helper loads an auto-provided service only when it is needed. It returns a function that resolves to the service instance through a promise.

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Syntax

function injectAsync<T>(loader: () => Promise<ProviderToken<T>>, options?: InjectAsyncOptions | undefined): () => Promise<T>;

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  • InjectAsyncOptions
  • ProviderToken
  • onIdle
  • @Injectable({providedIn: 'root'})
  • @Service()

Source: injectAsync • Angular. Checked 2026-11-03.