TypeError: search.valueChanges.debounceTime is not a function : <p>I am just learning angular2. At the time of applying something at input changes, I am getting the error.</p>

<p>app.ts:</p>

<pre><code>export class AppComponent {
    form: ControlGroup;

    constructor(fb: FormBuilder) {
        this.form = fb.group({
            search: []
        });

        var search = this.form.find('search');
        search.valueChanges
            .debounceTime(400)
            .map(str =&gt; (&lt;string&gt;str).replace(' ','‐'))
            .subscribe(x =&gt; console.log(x));
    };

 }
</code></pre>

<p>Error:</p>

<p><a href="https://i.stack.imgur.com/N5Enw.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/N5Enw.jpg" alt="enter image description here"></a></p>

<p>How to solve this? Am I missing something?</p>

<p><a href="http://plnkr.co/edit/MQIQvFYAvsPv9Pu8xZap?p=preview" rel="noreferrer">Plunker Demo</a></p>

<p><strong>N.B.</strong> I cannot produce anything at plunker as I am writing angular2 first time at plunker now. I have written only my app.ts code at plunker. I have showed the screenshot of error from my local pc. I will be grateful too if you tell me the way of running angular2 project at plunker.</p>
