interface Props {
  a?: number;
  b?: string;
}
 
const obj: Props = { a: 5 };
 
const obj2: Required<Props> = { a: 5 };

type PartialWith<K extends keyof T, T> = Partial<T> & Required<Record<K, T[K]>>
type PartialWithout<K extends keyof T, T> = Partial<Omit<T, K>>