Force typescript to put methods on the instance not the prototype

Question

Is it possible to force typescript to put methods on the instance not the prototype. I ask this because I frequently have \"this\" scope issues which having methods on the proto

Answer 1

It looks like this is a TypeScript/Knockout issue, as @Anzeo pointed out in his answer as well as your edit. I've gotten around the issue by putting my method declarations in the constructor but also using the var self = this; convention pointed out in the "Managing 'this'" section on Knockout's Computed Observable documentation. You TS code could look like this:

class FooViewModel{
    FooAlert: KnockoutObservableAny;
    openFooAlertDialogueAdd: () => void;

    constructor(){
        var self = this;
        self.FooAlert = ko.observable();
        self.openFooAlertDialogueAdd = function(){
            self.FooAlert('whatever your FooAlert observable takes');
        };
    }
}

No matter what scope change might occur, the JavaScript closure around self keeps you from having to worry about this changing. That should solve both your problems.