Method definition as result of function call in ClojureScript

Here's a sample piece of JS for Knockout:

function AppViewModel() { this.firstName = ko.observable('Bob'); this.lastName = ko.observable('Smith'); this.fullName = ko.computed(function() { return this.firstName() + " " + this.lastName(); }, this); } 

In case you're unfamiliar with KO, each field on AppViewModel becomes a function (i.e. ko.observable and ko.computed each return a function. Also note that fullName depends on both functions.

How can I rewrite this to ClojureScript?

One thing to try is:

(deftype AppViewModel [firstName lastName] Object (fullName [this] (.computed js/ko (str (firstName) " " (lastName))))) (defn my-model [first last] (AppViewModel. (.observable js/ko "Bob") (.observable js/ko "Smith"))) 

It doesn't work though, since fullName becomes a function that calls ko.computed. That is, it compiles to:

my_namespace.AppViewModel.prototype.fullName = function() { return ko.computed([cljs.core.str(this.firstName.call(null)), cljs.core.str(" "), cljs.core.str(this.lastName.call(null))].join("")) }; 

How can I deal with it in ClojureScript?

Again, note the dependency of fullName on this and firstName/lastName.