Namespace has no exported member

Question

When I write this in TypeScript, I get an error saying Namespace Bar has no exported member Qux. Why is that and how do I fix it?

class Foo {}

namespace Bar
{
    export const Qux = Foo;
}

let a: Bar.Qux;

Answer 1

You are exporting a constant, not a type. You can do this let a = new Bar.Foo(), and a will be of type Foo.

If you want to export both a type and a constant:

namespace Bar
{
    export const Qux = Foo;
    export type Qux = Foo;
}

Then you can have:

let a: Bar.Qux = new Bar.Qux();

TypeScript will determine, based on context, if you are using the type definition or the constant.