Are namespaces supported by AssemblyScript?

Something like this:

export namespace Foo {
  export const MY_CONSTANT: u32 = 1;
}

And then using it like this:

const value = Foo.MY_CONSTANT;

Yes, namespaces are supported by AssemblyScript.

export namespace Foo {
  export function doSomething(): string {
    return "I am doing something";
  }
}