Keyof nested child objects : <p>I have a recursively typed object that I want to get the keys of and any child keys of a certain type.</p>

<p>For instance. Below I want to get a union type of:</p>

<pre><code>'/another' | '/parent' | '/child'
</code></pre>

<p>Example: </p>

<pre><code>export interface RouteEntry {
    readonly name: string,
    readonly nested : RouteList | null
}
export interface RouteList {
    readonly [key : string] : RouteEntry
}

export const list : RouteList = {
    '/parent': {
        name: 'parentTitle',
        nested: {
            '/child': {
                name: 'child',
                nested: null,
            },
        },
    },
    '/another': {
        name: 'anotherTitle',
        nested: null
    },
}
</code></pre>

<p>In typescript you can use keyof typeof RouteList to get the union type:</p>

<pre><code>'/another' | '/parent' 
</code></pre>

<p>Is there a method to also include the nested types</p>
