[Solved] What is wrong with this facade service constructor?@Injectable({ providedIn: 'root' }) export class OrderFacade { constructor(orderService: OrderService) {} } | Angular

Angular - Advanced Patterns

What is wrong with this facade service constructor?

@Injectable({ providedIn: 'root' })
export class OrderFacade {
  constructor(orderService: OrderService) {}
}

AMissing access modifier for orderService parameter.

BShould not use @Injectable decorator.

CConstructor should be private.

DOrderService should be imported from Angular core.

Step-by-Step Solution

Solution:

Step 1: Review constructor parameter syntax
Angular DI requires parameters to have access modifiers (private/public) to create class properties.
Step 2: Identify missing modifier
orderService lacks private/public, so it won't be assigned as a property.
Final Answer:
Missing access modifier for orderService parameter. -> Option A
Quick Check:
Constructor DI needs access modifier [OK]

Quick Trick: Add private/public to constructor DI params [OK]

Common Mistakes:

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What is wrong with this facade service constructor?