Variable DirectThreadDetailsSchema`Const`

DirectThreadDetailsSchema: Struct<
    {
        is_group: Boolean;
        peer_user_id: optionalKey<String>;
        thread_title: String;
        thread_v2_id: String;
    },
> = ...

What the thread details hub is opened with: the thread and its name, and, on a one-to-one thread, the peer whose pk the sharing-info query sends. The peer's Facebook id is not here — the hub reads it from that query's answer.