Multiple type signatures for members, Union Types in TypeScript

Question

If I have a property that might be a string or a boolean how do I define it:

interface Foo{
    bar:string;
    bar:boolean;
}

I don\'t want

Answer 1

Not saying this answers your question, but could you resort to something like this?

interface Foo{
    bar:T;
}

function createFoo(bar:T) : Foo{
    return {bar:bar};
}

var sFoo = createFoo("s");
var len = sFoo.bar.length;

var bFoo = createFoo(true);
var result = bFoo.bar === true;