How to create a circularly referenced type in TypeScript?

Question

I have the following code:

type Document = number | string | Array;

TypeScript complains with the following error:

Answer 1

Building on what NPE said, types cannot recursively point to themselves, you could unroll this type to whatever level of depth you considered sufficient, e.g.:

type Document = [number|string|[number|string|[number|string|[number|string]]]]

Not pretty, but removes the need for an interface or class with a property value.