feat(core): Add a injectAsync helper function#68248
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JeanMeche wants to merge 1 commit intoangular:mainfrom
Open
feat(core): Add a injectAsync helper function#68248JeanMeche wants to merge 1 commit intoangular:mainfrom
injectAsync helper function#68248JeanMeche wants to merge 1 commit intoangular:mainfrom
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injectAsync help functioninjectAsync helper function
JeanMeche
commented
Apr 16, 2026
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+143
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+157
| it("should throw if the service wasn't provided in root", async () => { | ||
| class UnprovidedService {} | ||
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| const injector = TestBed.inject(Injector); | ||
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| let error!: Error; | ||
| try { | ||
| await injectAsync(() => Promise.resolve(UnprovidedService), {injector}); | ||
| } catch (e: any) { | ||
| error = e; | ||
| } | ||
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| expect(error).toBeDefined(); | ||
| expect(error.message).toContain('No provider found for `UnprovidedService`'); | ||
| }); |
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We could also support this use case an create an intermediate injector.
The service would then be tied to the lifecycle of the current/option injector.
The commit introduces a new function to assist users who want to lazy load services and use the DI system to create them.
Example:
```ts
* import {onIdle} from '@angular/core';
*
* // Simple injection (likely most common scenario)
* await injectAsync(() => import('./my-huge-dependency'));
*
* // Injection which is triggered when a browser becomes idle
* // We provide `onIdle` helper as a common building block
* await injectAsync(() => import('./my-huge-dependency'), {trigger: onIdle});
*
* // Custom trigger condition
* injectAsync(() => import('./my-huge-dependency'), {trigger: () => { ... }});
```
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The commit introduces a new function to assist users who want to lazy load services and use the DI system to create them.
Example: