Angular 2 : Encountering an issue when statically resolving symbol values - Is there a way to convert this into a factory method?

Upon installing Angular-cli, an error has surfaced:

A problem arose while resolving symbol values statically. Function calls are not supported. To resolve this, consider replacing the function or lambda with a reference to an exported function (position 55:19 in the original .ts file), which is causing symbol AppModule resolution issue at C:/TM-2013/Debt/Debt Platform/Code/main/Think.Debt.Presentation/deb-explorer-with-angular-cli/src/app/app.module.ts    

Within my App.Module.ts file, there seems to be an issue with the following code snippet:

providers: [

//   These services are required throughout the application    
AppConfigService,

{ provide: APP_INITIALIZER, useFactory: configServiceFactory, deps: [AppConfigService], multi: true },
{
  provide: HttpService,
  useFactory: (backend: XHRBackend, options: RequestOptions) => {
    return new HttpService(backend, options);
  },
  deps: [XHRBackend, RequestOptions]
}

],

EDIT:

Considering the .load method

{ provide: APP_INITIALIZER, useFactory: (config: AppConfigService) => () => config.load(), deps: [AppConfigService], multi: true },
{
  provide: HttpService,
  useFactory: (backend: XHRBackend, options: RequestOptions) => {
    return new HttpService(backend, options);
  },
  deps: [XHRBackend, RequestOptions]
}

Is it feasible to transform this into a factory class given its current usage limitations?

Answer №1

Follow the instructions exactly as stated:

// function exported with a specific name
export function createHttpService(backend: XHRBackend, options: RequestOptions) {
    return new HttpService(backend, options);
}

export function initializeConfigService(config: AppConfigService) {
    return () => config.load();
}

// here you declare your module along with `providers`
// ... omitted ...
{ provide: APP_INITIALIZER, useFactory: initializeConfigService, deps: [AppConfigService], multi: true },
{
    provide: HttpService,
    useFactory: createHttpService,  // usage of the function
    deps: [XHRBackend, RequestOptions]
}
// ... omitted ...

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