gistfile1.txt

import { Inject, Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';

import { CONFIG, Config } from '../config.module';

@Injectable({
  providedIn: 'root'
})
export class ConfigLoaderService {
  configUrl: string;
  _config: any;
  constructor(
    private http: HttpClient,
    @Inject(CONFIG) private config: Config
  ) {
    this.configUrl = config.api.config;
  }
  get values() {
    return this._config;
  }
  public load() {
    const promise = this.http.get(this.configUrl).toPromise();
    promise.then((data: any) => (this._config = data));
    return promise;
  }
}