Knockout typescript extenders

Question

Could anyone please post an example of extending an observable in knockout in typescript? Knockout extender: http://knockoutjs.com/documentation/extenders.html

I am

Answer 1

Update based on comment: In that case you just need to extend the interface separately to the definition file:

interface KnockoutExtenders {
    logChange: (target: KnockoutObservableAny, option: string) => KnockoutObservableAny;
}