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using cli I can do `pulumi config set --path 'a.b.x' 1` and then `pulumi config get --path 'a.b.x'` which will print `1` . How would I do this in TypeScript? I cannot seem to find an example on how to fetch nested values. The first step is something like this `config.requireObject('a')` but as requireObject has a return type of unknown i cannot do dot notation or `x in y` notation.

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;```
