error trying to adapt code from demo: config factory

[figuerres]

providers: [{ provide: ODataConfiguration, useFactory: TradeODataConfigurationFactory }, ODataServiceFactory],

at runtime i get
ERROR Error: Uncaught (in promise): TypeError: Class constructor TradeODataConfigurationFactory cannot be invoked without 'new' TypeError: Class constructor TradeODataConfigurationFactory cannot be invoked without 'new'

not sure if this has to do with the new angular / tsconfig default target of es2015 ??