`PickDeep` strips `null`

Author: relsunkaevCreated May 15, 2024Updated Jul 13, 2026

Labelsbugcomponent:paths

If you have following types

typescript

type Owner = {
  name: string;
  age: number;
};
type Pet = {
  name: string;
  age: number;
  owner: Owner | null;
};

the resulting type of PickDeep<Pet, "name" | "owner.name"> is

typescript

type Result = {
    name: string;
    // `owner` is no longer nullable
    owner: {
        name: string;
    };
}

Source: sindresorhus/type-fest