using polymer with typescript

i have created files:

card.html:

<polymer-element name="card" constructor="Card">
  <template>
    <link rel="stylesheet" href="card.css">
    <content></content>
  </template>
  <script src="card.js"></script>
</polymer-element>

card.js:

class Card {

    ready() {
    }

    leftView() {
    }
}

I'm trying to use polymer with typescript, as i understand class Card should extend Polymer class which extends Node just don't understand how to do .