frontend/src/app/configuration.service.ts


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import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { IConfig } from '../app/_data/IConfig'

@Injectable()
export class Configuration {
  static settings: IConfig;
  constructor(private http: HttpClient) { }
  load() {
    const jsonFile = 'assets/config.json';
    return new Promise<void>((resolve, reject) => {
      this.http.get(jsonFile).toPromise().then((response) => {
        Configuration.settings = <IConfig>response;
        resolve();
      }).catch((response: any) => {
        reject(`Could not load file '${jsonFile}': ${JSON.stringify(response)}`);
      });
    });
  }
}