Freezed package implement in a project with firestore

buttons.dart

// add
performLinksCrud(linksCollection, Add(newLink));

// edit
performLinksCrud(linksCollection, Update(newLink),documentID: data.documentID);

// delete
performLinksCrud(linksCollection, Delete(), documentID: data.documentID);

freezed_firestore.dart

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:freezed_annotation/freezed_annotation.dart';
import 'package:flutter/foundation.dart';
import 'package:links_landing_page/models/links.dart';

part 'user_freeze.freezed.dart';

@freezed
abstract class User implements _$User {
  const User._();
  factory User({String name, String id, String profilePicture}) = _User;

  static User empty() {
    return User(id: '', name: '', profilePicture: '');
  }

  static User fromDocument(DocumentSnapshot document) {
    if (document == null || document.data == null) return null;

    return User(
        name: document.data['name'],
        id: document.documentID,
        profilePicture: document.data['profile_picture']);
  }
}

@freezed
abstract class LinksOperation with _$LinksOperation {
  const factory LinksOperation.add(Link link) = Add;
  const factory LinksOperation.update(Link link) = Update;
  const factory LinksOperation.delete() = Delete;
}

void performLinksCrud(
  CollectionReference linksCollection,
  LinksOperation operation, {
  String documentID,
}) {
  operation.maybeWhen(
      add: (link) => linksCollection.add(link.toMap()),
      delete: () => linksCollection.document(documentID).delete(),
      update: (link) {
        linksCollection.document(documentID).updateData(link.toMap());
      },
      orElse: () => print('No such operation'));
}

This code should be updated.