type DeepPartial<T> = T extends object ? {
    [P in keyof T]?: DeepPartial<T[P]>;
} : T;

interface User {
    id: number;
    name: string;
    address: {
        street: string;
        city: string;
        zip?: string;
    };
    contact?: {
        email: string;
        phone: string;
    };
}

// Example Usage:
type PartialUserUpdate = DeepPartial<User>;

const userUpdate: PartialUserUpdate = {
    name: "Jane Doe",
    address: {
        city: "New York",
    },
};

const emptyUpdate: PartialUserUpdate = {}; // Valid