type PartialByKeys<T, K extends keyof T> = Omit<T, K> & Partial<Pick<T, K>>;

// Example Usage:
interface User {
  id: string;
  name: string;
  email: string;
  address?: string;
}

type UserUpdate = PartialByKeys<User, 'name' | 'email'>;
// UserUpdate will be:
// {
//   id: string;
//   address?: string;
//   name?: string;
//   email?: string;
// }

const userUpdate: UserUpdate = {
  id: '123',
  name: 'Jane Doe', // 'name' is now optional
};

// const incompleteUpdate: UserUpdate = {}; // Error: Property 'id' is missing
const fullUpdate: UserUpdate = {
  id: '456',
  name: 'Alice',
  email: 'alice@example.com',
  address: '123 Elm St'
};