knockout.js - How to subscribe to changes Knockout Observable in TypeScript? -

how subscribe changes knockout observable in typescript?

data :knockoutobservable<string> = ko.observable<string>(); 

i need like:

data.subscribe(function(e){})?? 

type script way write javascript. not make difference knockout.

so, can write subscribe in following manner (same in javascript)

data.subscribe(function(newvalue) {     alert(newvalue); });