TypeScript type signatures for functions with variable argument counts

I'm having trouble defining interfaces with function members that accept variable amounts of arguments. Take the following object literal as an example:

var obj = {
    func: () => {
        for(var i = 0; i < arguments.length; i++) {
            console.log(arguments[i]);
        }
    }
};

I'd like to be able to define an interface such as:

interface IExample {
    func: ( ??? ) => void;
}

So that the following code can compile without error:

var test = (o: IExample) {
    o.func("a");
    o.func("a", "b");
    o.func("a", "b", "c");
    ...
}

TypeScript uses the ECMAScript 6 spread proposal,


http://wiki.ecmascript.org/doku.php?id=harmony:spread

but adds type annotations so this would look like,

interface Example {
    func(...args: any[]): void;
}

Stack Overflow Q#12739149, score: 319