Pick object keys inside array

[thomas-at-perdoo]

I'm trying to use Object.P.Pick over this type:

type User = {
    id: string;
    name: string;
    posts: {
        id: string;
        title: string | null;
        body: string;
    }[] | null;
}

like this:

type Test = Object.P.Pick<User, ["name" | "posts", "id" | "posts", "title" ]>

expecting this:

type Test = {
    name: string;
    posts: {
        id: string;
        title: string | null;
    }[] | null;
}

but I'm instead getting this:

type Test = {
    name: string;
    posts: [] | null;
}

The [] there seem to be undefined[].

According to this PR support for arrays was added back in 2019. Are arrays still supported nowadays? If so, what is their syntax?