AppComponent.js

export class AppComponent implements OnInit {
  constructor(private httpClient: HttpClient) {
  }
  private config: {version: string};
  ngOnInit() {
   this.config = require("./../assets/config.json");
    console.log(this.config.version);

    const headers = new HttpHeaders()
      .set('Cache-Control', 'no-cache')
      .set('Pragma', 'no-cache'); 
      
    this.httpClient
      .get<{ version: string }>("/assets/config.json", {headers})
      .subscribe(config => {
        console.log(config);
      });
  }
}