import { Injectable } from '@angular/core';
import { Router } from '@angular/router';
import { signatureConfigurationServiceFactory } from '../../environments/services.factories';
import { RestService } from '.';

@Injectable({
  providedIn: 'root',
  useFactory: signatureConfigurationServiceFactory,
  deps: [Router, RestService]
})
export class SignatureConfigurationService {
  router: Router;
  restService: RestService;

  constructor(router: Router, restService: RestService) {
    this.router = router;
    this.restService = restService;
  }

  // ...
}

import { Router } from '@angular/router';
import { RestService } from '../app/services';
import { SignatureConfigurationService } from '../app/services/signature-configuration.service';

export let signatureConfigurationServiceFactory = (router: Router, restService: RestService) => {
  return new SignatureConfigurationService(router, restService);
};