title: APP_INITIALIZER load service call Angular 13
body: <p>I am using Angular 13 and trying to hook into Angular’s bootstrapping phase by using the APP_INITIALIZER token.Need to create angular service that handles the fetching of our remote configuration, But the issue is topromise is no longer supported , its deprecated , how do I re write this loadAppConfig() method since APP_INITIALIZER only supports promises. Any help is highly appreciated.</p>
  <pre><code>import { Injectable } from '@angular/core';
  import { HttpClient } from '@angular/common/http';
  
  @Injectable()
  export class AppConfigService {
    private appConfig;
  
    constructor(private http: HttpClient) { }
  
    loadAppConfig() {
      return this.http.get('/assets/data/appConfig.json')
        .toPromise()
        .then(data =&gt; {
          this.appConfig = data;
        });
    }
  
    getConfig() {
      return this.appConfig;
    }
  }
  </code></pre>