Here is the documentation: https://angular.io/api/core/Directive#providers https://angular.io/api/core/Directive#providers I discovered this around Angular 2.0

Here is the documentation: https://angular.io/api/core/Directive#providers https://angular.io/api/core/Directive#providers I discovered this around Angular 2.0.0 by exploring using Typescript's autocompletion. It can be very useful!