type User = { id: number; name: string; email: string; active: boolean };
type UserPatch = Partial<Pick<User, 'name' | 'email' | 'active'>>;
type PublicUser = Omit<User, 'email'>;
type UserById = Record<number, PublicUser>;
function patchUser(user: User, patch: UserPatch): User { return { ...user, ...patch }; }
const updated = patchUser({ id: 1, name: 'A', email: 'a@example.test', active: true }, { name: 'Ada' });
console.log(updated);