Function call SocialLoginModule, function calls are not supported. Pay attention to replacing a function or lambda with a link

Question

after "ng serve" or "npm start", I get below the error,

after saving any file from the workspace, it compiles all the project files, and this time it works well. I do not understand why this is happening. Could you help someone help me get out of this. Please find below image for this.

Please find below app.module.ts file

    import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';
import { RouterModule } from '@angular/router';
import { SocialLoginModule, AuthServiceConfig, GoogleLoginProvider, FacebookLoginProvider } from "angular4-social-login";
import { StarRatingModule } from 'angular-star-rating';
import { AppComponent } from './app.component';
import { LandingPageComponent } from './landing-page/landing-page.component';
import { AppHeaderComponent } from './app-header/app-header.component';
let config = new AuthServiceConfig([
  {
    id: GoogleLoginProvider.PROVIDER_ID,
    provider: new GoogleLoginProvider("")
  },
  {
    id: FacebookLoginProvider.PROVIDER_ID,
    provider: new FacebookLoginProvider("")
  }
]);
export function provideConfig() {
  return config;
}
@NgModule({
  declarations: [
    AppComponent,
    LandingPageComponent,
    AppHeaderComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    StarRatingModule.forRoot(),
    RouterModule.forRoot([
      { path: 'landing', component: LandingPageComponent },
      { path: '', redirectTo: 'landing', pathMatch: 'full' }
    ]),
    SocialLoginModule.initialize(config)
  ],
  providers: [{
    provide: AuthServiceConfig,
    useFactory: provideConfig
  }],
  bootstrap: [AppComponent]
})
export class AppModule { }

Answer 1

add to app.module.ts:

export function provideConfig() {
  return config;
}

update importsin this file:

SocialLoginModule

update providers in this file:

  providers: [
    {
      provide: AuthServiceConfig,
      useFactory: provideConfig
    }
  ],

The full fragment can be seen at: https://github.com/abacritt/angular4-social-login/blob/master/README-AOT.md