typescript_partially_required.ts

type PartiallyRequired<T, K extends keyof T> = Omit<T, K> & Required<Pick<T, K>>;

interface Human {
  name: string;
  age?: number;
}

type HumanWithRequiredAge = PartiallyRequired<Human, "age">;

const dan: HumanWithRequiredAge = {
  name: "Dan Jordan",
};