Generic observable example (http://ideasof.andersaberg.com/)

Generic observable

/// <reference path="ko.d.ts" />
class MyKnockOutApp {
    User: KnockoutObservable<User>;
    PrivateMessage = ko.observable<Message>(null);

    MyComputedMessage: KnockoutComputed<Message>;

    constructor() {
        // Will throw an error since types are not matching 
        this.User = ko.observable<Message>(undefined);

        // Works
        this.User = ko.observable<User>(undefined);
        this.User(new User());

        // Read the values. Using the wrong type will throw compiler error
        var value: User = this.User();
        var value2: Message = this.PrivateMessage();

        // Computed example
        this.MyComputedMessage = ko.computed<Message>(() => {
            // Will throw compiler error
            return this.User();

            // Works
            return this.PrivateMessage();
        });
    }
}