next-ucap-messenger/projects/ucap-webmessenger-app/src/app/app-provider.module.ts

import { NgModule, APP_INITIALIZER } from '@angular/core';

import { RESOLVERS } from './resolvers';
import { SERVICES } from './services';
import { AppService } from './services/app.service';
import { HttpClient } from '@angular/common/http';
import { UCAP_NATIVE_SERVICE } from '@ucap-webmessenger/native';
import { environment } from '../environments/environment';

export function initializeApp(appService: AppService) {
  return (): Promise<any> => {
    return appService.postInit();
  };
}

@NgModule({
  imports: [],
  exports: [],
  providers: [
    ...SERVICES,
    ...RESOLVERS,
    {
      provide: UCAP_NATIVE_SERVICE,
      useClass: environment.modules.native.serviceClass,
      deps: [HttpClient]
    },
    {
      provide: APP_INITIALIZER,
      useFactory: initializeApp,
      deps: [AppService],
      multi: true
    }
  ]
})
export class AppProviderModule {}