Select a deeply nested value's type in a partial object using conditional types

[hybrid jetty]

Hello,

What's the best way of accessing deeply nested values in a partial object using conditional types, or return "undefined" otherwise?

I tried doing this: https://tsplay.dev/wjD6Mm

But it returns "unknown" instead of "undefined" when I don't pass values 🤔

Thanks for your help!

[tropic topaz]

jgoux#5970

Playground Link

Preview:```ts
type TableFilter =
| "public.user"
| "public.foo"
| "public.bar"
| "public."
| "secret.dont_look"
| "secret."
type SchemaFilter = "public" | "secret"

type ExcludeConfig = {
data?: TableFilter[]
structure?: {
tables?: TableFilter[]
schemas?: SchemaFilter[]
...```

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