Using Pusher Ionic

Hello, I have a question, because I’m try to include “pusher” in my project in Ionic 2 and in my index.html I have added this line:
and in my home.ts I have added this line: var pusher = new Pusher(‘APP_KEY’);
and I have this error: “Error TS2304: Cannot find name ‘Pusher’.” Somebody know how to solve it?
Thanks in advance.

Best regards.

Did you ever figure this out?