Add skipProvidedIn option to service schematic

[MeAkib]

Command

generate

Description

Currently, when generating a service using ng g s service-name, the CLI always generates the service with providedIn: 'root' in the Injectable decorator.

For applications that prefer to manually provide services in specific modules or components rather than using the tree-shakeable pattern, developers must manually remove this metadata every time a service is generated.

Describe the solution you'd like

Generate service without providedIn (new behavior)

ng g s my-service --skip-provided-in

Generate service with providedIn: 'root' (default, current behavior)

ng g s my-service

Expected Output with --skip-provided-in:

import { Injectable } from '@angular/core';  
  
@Injectable()  
export class MyService {}

Current Output (default behavior, unchanged):

import { Injectable } from '@angular/core';  
  
@Injectable({  
  providedIn: 'root'  
})  
export class MyService {  

}

Configuration Support

{  
  "schematics": {  
    "@schematics/angular:service": {  
      "skipProvidedIn": true  
    }  
  }  
} 

[alan-agius4]

Thanks for this feature request.

For the vast majority of services in an Angular application, using providedIn: 'root' in the @Injectable() decorator is the recommended, and most efficient approach. This method, introduced in Angular 6, is the preferred over the "old" way adding services to a module's providers array.

While there are certainly cases where providedIn: 'root' is not needed, I do not think it it warrants adding another option to the public API surface of the schematic.