Typescript: Using the type of a static inner class

Question

I\'m trying to write a class that exposes an inner data structure to its consumers, a data structure that the class itself will be using.

Example:

class Ou         


        

Answer 1

I found a better workaround for this, that even allows the inner class to access the private members of the outer class, like you would expect in a C#-like language. You can actually easily get the type of the static property with the typeof operator. This small modification to your example works:

class Outer
{
    static Inner = class
    {
        inInner: number = 0;
    };

    constructor(public inner: typeof Outer.Inner.prototype) { }
}

But referring to the type as typeof Outer.Inner.prototype gets cumbersome really quickly, so add in this underneath and you can simply refer to it as Outer.Inner as you'd like:

namespace Outer
{
    export type Inner = typeof Outer.Inner.prototype;
}

Combine this with another workaround to allow us to put decorators on the class by making it not an anonymous class and we end up with a fully functional true inner class:

class Outer
{
    static Inner = (() =>
    {
        @decoratable()
        class OuterInner
        {
            inInner: number = 0;
        }
        return OuterInner;
    })();

    constructor(public inner: Outer.Inner) { }
}

namespace Outer
{
    export type Inner = typeof Outer.Inner.prototype;
}