Is there a way to set a default value for an Angular service provider?

Imagine an Angular Service that encapsulates the HTTP Client Module.

export class HttpWrapperService {
  private apiKey: string;
}

Of course, it offers additional features that are not relevant here.

Now I'm faced with the task of supplying HttpWrapperService to multiple modules with a unique default value. This default value should be assigned to a private member variable, namely private apiKey: string;


Thoughts:

Upon observing other imports with default values, I ponder on how this can be achieved.

RouterModule.forRoot(AppRoutes),
GravatarModule.forRoot(GRAVATAR_CONFIG_TYPE1),
AngularFireModule.initializeApp(environment.firebaseConfig),
ServiceWorkerModule.register("ngsw-worker.js", {
  enabled: environment.production
})

Current Approach

At present, I am utilizing a static method to initialize a static variable. Yet, unsure if this is the best solution to the issue at hand.

export class AppModule {

  constructor(){
    HttpWrapperService.register(environment.apiKeyHeaders);
    UserService.registerEndpoint(environment.apiEndpoint);
  }
}

Answer №1

To ensure security, it is recommended to provide the API key value within the AppModule like this:

@NgModule({
  providers: [
    { provide: 'API_KEY', useValue: '<apiKeyValue>' },
    HttpWrapperService
  ],
})
export class AppModule { }

Once configured in the AppModule, the API key value can easily be injected as shown below:

export class HttpWrapperService {
    constructor(@Inject('API_KEY') private apiKey: string) {}
}

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