title: Angular 2: Cannot find name 'Subscription'
body: <p>When trying to set the type of an attribute I get the error <code>Cannot find name 'Subscription'</code>. From which package do I import it from?</p>
  
  <pre><code>import { Component, OnDestroy, OnInit } from '@angular/core';
  import { ActivatedRoute, Router } from '@angular/router';
  
  // I'm missing an import here. Just don't know which package to load from.
  
  @Component({
    moduleId: module.id,
    selector: 'my-component',
    templateUrl: 'my.component.html',
    styleUrls: ['my.component.css']
  })
  export class MyComponent implements OnInit, OnDestroy {
  
    private sub: any;
  
    constructor(private route: ActivatedRoute,
      private router: Router) {}
  
    ngOnInit() {
      this.sub = this.route.params.subscribe(params =&gt; {
         let id = +params['id']; // (+) converts string 'id' to a number
       });
    }
  
    ngOnDestroy() {
      this.sub.unsubscribe();
    }
  
  }
  </code></pre>
  
  <p><strong>Edit:</strong> Provide a more detailed code example.</p>