Extending instance/static functions on existing prototypes with TypeScript

Question

I recently asked a question about TypeScript\'s ability to extend existing prototypes in the JavaScript API (here: Extending Object.prototype with TypeScript).

This

Answer 1

UPDATE

It is now possible since TS 1.4. See Stefan's answer above

LEGACY

I have this bug raised for a while now: https://typescript.codeplex.com/workitem/917

One solution that the typescript team could have (without extending the language spec) is have used interfaces for the static members and constructors : http://basarat.github.io/TypeScriptDeepDive/#/modellingstatics

Basically if lib.d.ts had:

//Pulled from lib.d.ts

interface Object {
    toString(): string;
    toLocaleString(): string;
    valueOf(): Object;
    hasOwnProperty(v: string): bool;
    isPrototypeOf(v: Object): bool;
    propertyIsEnumerable(v: string): bool;
    [s: string]: any;
}

interface ObjectStatic {
    new (value?: any): Object;
    (): any;
    (value: any): any;
    prototype: Object;
    ...
}

declare var Object: ObjectStatic; 

Then you could have easily added members to Object via:

interface ObjectStatic {
    FooAgain(): void;
}

Object.FooAgain = function () {
    // TS would be fine with this. 
}

I just created a feature request for this as well : https://typescript.codeplex.com/workitem/1085