di-example.ts

import {Component, Injectable, provide} from 'angular2/core';

abstract class AbstractTodoService{...}

@Injectable()
class TodoService extends AbstractTodoService{...}

@Component({
  selector: 'todo-home',
  viewProviders: [
    provide(AbstractTodoService, { useClass: TodoService })  
  ],
  template: `...`
})
class TodoHome{
  constructor(todoService: AbstractTodoService){ }
}