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It's manual. You have to declare an interface in TS and assign the result to a variable of that interface type. Then you get the full type. It is not optimal but it is the (only?) way right now.

in TS you can also cast unknown to an interface (as already mentioned), or `any` to achieve this
```&gt; const x: unknown = { a: { b: { x: "foo" }}};
undefined
&gt; console.log((x as { a: {b: {x: string; }}}).a.b.x)
foo
&gt; console.log((x as any).a.b.x)
foo```

creating an interface to represent your config is considered idiomatic typescript.
Here interface A represents the structure of the “a” config key:
```interface A {
   b: {
      x: string;
   }
}

const myA = config.requireObject&lt;A&gt;("a");  // generic cast
const x = myA.b.x;```
