Which of the following is the correct way to define a facade service in Angular?

easy📝 Syntax Q3 of 15

Angular - Advanced Patterns

export class MyFacadeService {}

Aexport function MyFacadeService() {}

B@Injectable({ providedIn: 'root' }) export class MyFacadeService {}

C@Component({ selector: 'app-facade' }) export class MyFacadeService {}

Dexport interface MyFacadeService {}

Step-by-Step Solution

Solution:

Step 1: Identify Angular service declaration
Angular services use @Injectable decorator with providedIn to register globally.
Step 2: Check options for correct syntax
Only @Injectable({ providedIn: 'root' }) export class MyFacadeService {} uses @Injectable with providedIn: 'root', correct for services.
Final Answer:
@Injectable({ providedIn: 'root' }) export class MyFacadeService {} -> Option B
Quick Check:
Facade service syntax = @Injectable with providedIn [OK]

Quick Trick: Use @Injectable({providedIn:'root'}) for services [OK]

Common Mistakes:

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