Create instance of DataService with MemoryDataSource and ApiDataSource

dataService.factory.ts

app.factory('dataService', ['$q', 'logger', 'apiService', 'resources', ($q, logger, apiService, resources) => {

  var dataService = new App.Services.DataService($q);
  
  dataService.source(new TSCore.App.Data.DataSources.MemoryDataSource($q, logger));
  dataService.source(new TSCore.App.Data.DataSources.ApiDataSource($q, apiService, logger));
  
  dataService.setResources(resources);
  
  return dataService;
}]);