feat: Converted to ios models

packages/stream_chat/example/lib/main.dart

@@ -11,7 +11,7 @@ Future<void> main() async {
   /// Please see the following for more information:
   /// https://getstream.io/chat/docs/ios_user_setup_and_tokens/
   await client.connectUser(
-    User(
+    User.temp(
       id: 'cool-shadow-7',
       extraData: {
         'image':

packages/stream_chat/lib/src/api/channel.dart

@@ -59,12 +59,12 @@ class Channel {
   /// Returns true if the channel is muted
   bool get isMuted =>
       _client.state!.user?.channelMutes
-          ?.any((element) => element.channel!.cid == cid) ==
+          .any((element) => element.channel!.cid == cid) ==
       true;
 
   /// Returns true if the channel is muted as a stream
   Stream<bool>? get isMutedStream => _client.state!.userStream.map((event) =>
-      event!.channelMutes?.any((element) => element.channel!.cid == cid) ==
+      event!.channelMutes.any((element) => element.channel!.cid == cid) ==
       true);
 
   /// True if the channel is a group
@@ -309,7 +309,7 @@ class Channel {
     );
     // ignore: parameter_assignments
     message = message.copyWith(
-      createdAt: message.createdAt ?? DateTime.now(),
+      createdAt: message.createdAt,
       user: _client.state!.user,
       quotedMessage: quotedMessage,
       status: MessageSendingStatus.sending,
@@ -363,7 +363,7 @@ class Channel {
     // ignore: parameter_assignments
     message = message.copyWith(
       status: MessageSendingStatus.updating,
-      updatedAt: message.updatedAt ?? DateTime.now(),
+      updatedAt: message.updatedAt,
       attachments: message.attachments?.map(
         (it) {
           if (it.uploadState.isSuccess) return it;
@@ -574,7 +574,7 @@ class Channel {
       messageId: messageId,
       createdAt: now,
       type: type,
-      user: user,
+      user: user!,
       score: 1,
       extraData: extraData,
     );
@@ -582,7 +582,7 @@ class Channel {
     // Inserting at the 0th index as it's the latest reaction
     latestReactions.insert(0, newReaction);
     final ownReactions = [...latestReactions]
-      ..removeWhere((it) => it.userId != user!.id);
+      ..removeWhere((it) => it.userId != user.id);
 
     final newMessage = message.copyWith(
       reactionCounts: {...message.reactionCounts ?? <String, int>{}}
@@ -632,15 +632,11 @@ class Channel {
 
     final reactionCounts = {...message.reactionCounts ?? <String, int>{}};
     if (reactionCounts.containsKey(type)) {
-      if (type != null) {
+      reactionCounts.update(type, (value) => value - 1);
-        reactionCounts.update(type, (value) => value - 1);
-      }
     }
     final reactionScores = {...message.reactionScores ?? <String, int>{}};
     if (reactionScores.containsKey(type)) {
-      if (type != null) {
+      reactionScores.update(type, (value) => value - 1);
-        reactionScores.update(type, (value) => value - 1);
-      }
     }
 
     final latestReactions = [...message.latestReactions ?? <Reaction>[]]
@@ -917,7 +913,11 @@ class Channel {
       GetMessagesByIdResponse.fromJson,
     )!;
 
-    state?.updateChannelState(ChannelState(messages: res.messages));
+    final messages = res.messages;
+
+    if (messages != null) {
+      state?.updateChannelState(ChannelState(messages: messages));
+    }
 
     return res;
   }
@@ -987,7 +987,7 @@ class Channel {
         cid,
         messagePagination: messagesPagination,
       ))!;
-      if (updatedState.messages!.isNotEmpty) {
+      if (updatedState.messages.isNotEmpty) {
         if (state == null) {
           _initState(updatedState);
         } else {
@@ -1270,17 +1270,17 @@ class ChannelClientState {
   final _subscriptions = <StreamSubscription>[];
 
   void _computeInitialUnread() {
-    final userRead = channelState?.read?.firstWhereOrNull(
+    final userRead = channelState?.read.firstWhereOrNull(
-      (r) => r.user!.id == _channel._client.state?.user?.id,
+      (r) => r.user.id == _channel._client.state?.user?.id,
     );
     if (userRead != null) {
-      _unreadCountController.add(userRead.unreadMessages ?? 0);
+      _unreadCountController.add(userRead.unreadMessages);
     }
   }
 
   void _checkExpiredAttachmentMessages(ChannelState channelState) {
     final expiredAttachmentMessagesId = channelState.messages
-        ?.where((m) =>
+        .where((m) =>
             !_updatedMessagesIds.contains(m.id) &&
             m.attachments?.isNotEmpty == true &&
             m.attachments?.any((e) {
@@ -1300,8 +1300,8 @@ class ChannelClientState {
                 true)
         .map((e) => e.id)
         .toList();
-    if (expiredAttachmentMessagesId?.isNotEmpty == true) {
+    if (expiredAttachmentMessagesId.isNotEmpty == true) {
-      _channel.getMessagesById(expiredAttachmentMessagesId!);
+      _channel.getMessagesById(expiredAttachmentMessagesId);
       _updatedMessagesIds.addAll(expiredAttachmentMessagesId);
     }
   }
@@ -1311,7 +1311,7 @@ class ChannelClientState {
       final member = e.member;
       updateChannelState(channelState!.copyWith(
         members: [
-          ...channelState!.members!,
+          ...channelState!.members,
           member,
         ],
       ));
@@ -1323,7 +1323,7 @@ class ChannelClientState {
       final user = e.user;
       updateChannelState(channelState!.copyWith(
         members: List.from(
-            channelState!.members!..removeWhere((m) => m!.userId == user!.id)),
+            channelState!.members..removeWhere((m) => m!.userId == user!.id)),
       ));
     }));
   }
@@ -1373,7 +1373,7 @@ class ChannelClientState {
             .where(
               (message) =>
                   message.status != MessageSendingStatus.sent &&
-                  message.createdAt!.isBefore(
+                  message.createdAt.isBefore(
                     DateTime.now().subtract(
                       const Duration(
                         seconds: 1,
@@ -1425,7 +1425,7 @@ class ChannelClientState {
       if (message.pinned == true) {
         _channelState = _channelState!.copyWith(
           pinnedMessages: [
-            ..._channelState!.pinnedMessages ?? [],
+            ..._channelState!.pinnedMessages,
             message,
           ],
         );
@@ -1462,7 +1462,7 @@ class ChannelClientState {
   /// Add a message to this channel
   void addMessage(Message message) {
     if (message.parentId == null || message.showInChannel == true) {
-      final newMessages = List<Message>.from(_channelState!.messages!);
+      final newMessages = List<Message>.from(_channelState!.messages);
       final oldIndex = newMessages.indexWhere((m) => m.id == message.id);
       if (oldIndex != -1) {
         Message? m;
@@ -1505,16 +1505,17 @@ class ChannelClientState {
         (event) {
           final readList = List<Read>.from(_channelState?.read ?? []);
           final userReadIndex =
-              read?.indexWhere((r) => r.user!.id == event.user!.id);
+              read?.indexWhere((r) => r.user.id == event.user!.id);
 
           if (userReadIndex != null && userReadIndex != -1) {
             final userRead = readList.removeAt(userReadIndex);
-            if (userRead.user?.id == _channel._client.state!.user!.id) {
+            if (userRead.user.id == _channel._client.state!.user!.id) {
               _unreadCountController.add(0);
             }
             readList.add(Read(
-              user: event.user,
+              user: event.user!,
-              lastRead: event.createdAt,
+              lastRead: event.createdAt!,
+              unreadMessages: event.totalUnreadCount!,
             ));
             _channelState = _channelState!.copyWith(read: readList);
           }
@@ -1531,15 +1532,15 @@ class ChannelClientState {
       channelStateStream.map((cs) => cs!.messages);
 
   /// Channel pinned message list
-  List<Message>? get pinnedMessages => _channelState!.pinnedMessages?.toList();
+  List<Message>? get pinnedMessages => _channelState!.pinnedMessages.toList();
 
   /// Channel pinned message list as a stream
   Stream<List<Message>?> get pinnedMessagesStream =>
-      channelStateStream.map((cs) => cs!.pinnedMessages?.toList());
+      channelStateStream.map((cs) => cs!.pinnedMessages.toList());
 
   /// Get channel last message
-  Message? get lastMessage => _channelState!.messages?.isNotEmpty == true
+  Message? get lastMessage => _channelState!.messages.isNotEmpty == true
-      ? _channelState!.messages!.last
+      ? _channelState!.messages.last
       : null;
 
   /// Get channel last message
@@ -1547,8 +1548,8 @@ class ChannelClientState {
       .map((event) => event?.isNotEmpty == true ? event!.last : null);
 
   /// Channel members list
-  List<Member> get members => _channelState!.members!
+  List<Member> get members => _channelState!.members
-      .map((e) => e!.copyWith(user: _channel.client.state!.users[e.user!.id!]))
+      .map((e) => e!.copyWith(user: _channel.client.state!.users[e.user!.id]))
       .toList();
 
   /// Channel members list as a stream
@@ -1568,8 +1569,8 @@ class ChannelClientState {
       channelStateStream.map((cs) => cs!.watcherCount);
 
   /// Channel watchers list
-  List<User> get watchers => _channelState!.watchers!
+  List<User> get watchers => _channelState!.watchers
-      .map((e) => _channel.client.state!.users[e.id!] ?? e)
+      .map((e) => _channel.client.state!.users[e.id] ?? e)
       .toList();
 
   /// Channel watchers list as a stream
@@ -1597,7 +1598,7 @@ class ChannelClientState {
 
   bool _countMessageAsUnread(Message message) {
     final userId = _channel.client.state?.user?.id;
-    final userIsMuted = _channel.client.state?.user?.mutes?.firstWhereOrNull(
+    final userIsMuted = _channel.client.state?.user?.mutes.firstWhereOrNull(
           (m) => m.user?.id == message.user!.id,
         ) !=
         null;
@@ -1642,37 +1643,37 @@ class ChannelClientState {
   /// Update channelState with updated information
   void updateChannelState(ChannelState updatedState) {
     final newMessages = <Message>[
-      ...updatedState.messages ?? [],
+      ...updatedState.messages,
       ..._channelState?.messages
-              ?.where((m) =>
+              .where((m) =>
                   updatedState.messages
-                      ?.any((newMessage) => newMessage.id == m.id) !=
+                      .any((newMessage) => newMessage.id == m.id) !=
                   true)
               .toList() ??
           [],
     ]..sort(_sortByCreatedAt as int Function(Message, Message)?);
 
     final newWatchers = <User>[
-      ...updatedState.watchers ?? [],
+      ...updatedState.watchers,
       ..._channelState?.watchers
-              ?.where((w) =>
+              .where((w) =>
                   updatedState.watchers
-                      ?.any((newWatcher) => newWatcher.id == w.id) !=
+                      .any((newWatcher) => newWatcher.id == w.id) !=
                   true)
               .toList() ??
           [],
     ];
 
     final newMembers = <Member?>[
-      ...updatedState.members ?? [],
+      ...updatedState.members,
     ];
 
     final newReads = <Read>[
-      ...updatedState.read ?? [],
+      ...updatedState.read,
       ..._channelState?.read
-              ?.where((r) =>
+              .where((r) =>
                   updatedState.read
-                      ?.any((newRead) => newRead.user!.id == r.user!.id) !=
+                      .any((newRead) => newRead.user.id == r.user.id) !=
                   true)
               .toList() ??
           [],
@@ -1828,9 +1829,8 @@ class ChannelClientState {
     _pinnedMessagesTimer = Timer.periodic(const Duration(seconds: 30), (_) {
       final now = DateTime.now();
       var expiredMessages = channelState!.pinnedMessages
-              ?.where((m) => m.pinExpires?.isBefore(now) == true)
+          .where((m) => m.pinExpires?.isBefore(now) == true)
-              .toList() ??
+              .toList();
-          [];
       if (expiredMessages.isNotEmpty) {
         expiredMessages = expiredMessages
             .map((m) => m.copyWith(

packages/stream_chat/lib/src/client.dart

@@ -311,7 +311,7 @@ class StreamChatClient {
 
         httpClient.unlock();
 
-        await connectUser(User(id: userId), newToken);
+        await connectUser(User.temp(id: userId), newToken);
 
         try {
           handler.resolve(
@@ -750,7 +750,7 @@ class StreamChatClient {
     final channels = res.channels!;
 
     final users = channels
-        .expand((it) => it.members!)
+        .expand((it) => it.members)
         .map((it) => it!.user)
         .toList(growable: false);
 
@@ -954,7 +954,7 @@ class StreamChatClient {
 
     _anonymous = true;
     const uuid = Uuid();
-    state!.user = OwnUser(id: uuid.v4());
+    state!.user = OwnUser.temp(id: uuid.v4());
 
     return connect().then((event) {
       _connectCompleter!.complete(event);

packages/stream_chat/lib/src/db/chat_persistence_client.dart

@@ -76,11 +76,11 @@ abstract class ChatPersistenceClient {
       getPinnedMessagesByCid(cid, messagePagination: pinnedMessagePagination),
     ]);
     return ChannelState(
-      members: data[0] as List<Member?>?,
+      members: (data[0] as List<Member?>?)!,
-      read: data[1] as List<Read>?,
+      read: (data[1] as List<Read>?)!,
       channel: data[2] as ChannelModel?,
-      messages: data[3] as List<Message>?,
+      messages: (data[3] as List<Message>?)!,
-      pinnedMessages: data[4] as List<Message>?,
+      pinnedMessages: (data[4] as List<Message>?)!,
     );
   }
 
@@ -176,7 +176,7 @@ abstract class ChatPersistenceClient {
   /// Update list of channel states
   Future<void> updateChannelStates(List<ChannelState> channelStates) async {
     final deleteReactions = deleteReactionsByMessageId(channelStates
-        .expand((it) => it.messages!)
+        .expand((it) => it.messages)
         .map((m) => m.id)
         .toList(growable: false));
 
@@ -193,20 +193,19 @@ abstract class ChatPersistenceClient {
         channelStates.map((it) => it.channel).where((it) => it != null);
 
     final reactions = channelStates
-        .expand((it) => it.messages!)
+        .expand((it) => it.messages)
         .expand((it) => [
               if (it.ownReactions != null)
                 ...it.ownReactions!.where((r) => r.userId != null),
               if (it.latestReactions != null)
                 ...it.latestReactions!.where((r) => r.userId != null)
-            ])
+            ]);
-        .where((it) => it != null);
 
     final users = channelStates
         .map((cs) => [
               cs.channel?.createdBy,
-              ...?cs.messages
+              ...cs.messages
-                  ?.map((m) => [
+                  .map((m) => [
                         m.user,
                         if (m.latestReactions != null)
                           ...m.latestReactions!.map((r) => r.user),
@@ -214,33 +213,33 @@ abstract class ChatPersistenceClient {
                           ...m.ownReactions!.map((r) => r.user),
                       ])
                   .expand((v) => v),
-              if (cs.read != null) ...cs.read!.map((r) => r.user),
+              ...cs.read.map((r) => r.user),
-              if (cs.members != null) ...cs.members!.map((m) => m!.user),
+              ...cs.members.map((m) => m!.user),
             ])
         .expand((it) => it)
         .where((it) => it != null);
 
     final updateMessagesFuture = channelStates.map((it) {
       final cid = it.channel!.cid;
-      final messages = it.messages!.where((it) => it != null);
+      final messages = it.messages;
       return updateMessages(cid, messages.toList(growable: false));
     }).toList(growable: false);
 
     final updatePinnedMessagesFuture = channelStates.map((it) {
       final cid = it.channel!.cid;
-      final messages = it.pinnedMessages!.where((it) => it != null);
+      final messages = it.pinnedMessages;
       return updatePinnedMessages(cid, messages.toList(growable: false));
     }).toList(growable: false);
 
     final updateReadsFuture = channelStates.map((it) {
       final cid = it.channel!.cid;
-      final reads = it.read?.where((it) => it != null) ?? [];
+      final reads = it.read;
       return updateReads(cid, reads.toList(growable: false));
     }).toList(growable: false);
 
     final updateMembersFuture = channelStates.map((it) {
       final cid = it.channel!.cid;
-      final members = it.members!.where((it) => it != null);
+      final members = it.members.where((it) => it != null);
       return updateMembers(cid, members.toList(growable: false));
     }).toList(growable: false);
 

packages/stream_chat/lib/src/models/attachment.dart

@@ -15,7 +15,7 @@ class Attachment extends Equatable {
   /// Constructor used for json serialization
   Attachment({
     String? id,
-    this.type,
+    required this.type,
     this.titleLink,
     String? title,
     this.thumbUrl,
@@ -57,7 +57,7 @@ class Attachment extends Equatable {
 
   ///The attachment type based on the URL resource. This can be: audio,
   ///image or video
-  final String? type;
+  final String type;
 
   ///The link to which the attachment message points to.
   final String? titleLink;

packages/stream_chat/lib/src/models/attachment.g.dart

@@ -9,7 +9,7 @@ part of 'attachment.dart';
 Attachment _$AttachmentFromJson(Map json) {
   return Attachment(
     id: json['id'] as String?,
-    type: json['type'] as String?,
+    type: json['type'] as String,
     titleLink: json['title_link'] as String?,
     title: json['title'] as String?,
     thumbUrl: json['thumb_url'] as String?,
@@ -44,7 +44,9 @@ Attachment _$AttachmentFromJson(Map json) {
 }
 
 Map<String, dynamic> _$AttachmentToJson(Attachment instance) {
-  final val = <String, dynamic>{};
+  final val = <String, dynamic>{
+    'type': instance.type,
+  };
 
   void writeNotNull(String key, dynamic value) {
     if (value != null) {
@@ -52,7 +54,6 @@ Map<String, dynamic> _$AttachmentToJson(Attachment instance) {
     }
   }
 
-  writeNotNull('type', instance.type);
   writeNotNull('title_link', instance.titleLink);
   writeNotNull('title', instance.title);
   writeNotNull('thumb_url', instance.thumbUrl);

packages/stream_chat/lib/src/models/channel_model.dart

@@ -12,19 +12,34 @@ class ChannelModel {
   ChannelModel({
     this.id,
     this.type,
-    this.cid,
+    required this.cid,
-    this.config,
+    required this.config,
     this.createdBy,
-    this.frozen,
+    this.frozen = false,
     this.lastMessageAt,
-    this.createdAt,
+    required this.createdAt,
-    this.updatedAt,
+    required this.updatedAt,
     this.deletedAt,
-    this.memberCount,
+    this.memberCount = 0,
     this.extraData,
     this.team,
   });
 
+  ChannelModel.temp({
+    this.id,
+    this.type,
+    required this.cid,
+    this.createdBy,
+    this.frozen = false,
+    this.lastMessageAt,
+    this.deletedAt,
+    this.memberCount = 0,
+    this.extraData,
+    this.team,
+  })  : createdAt = DateTime.now(),
+        updatedAt = DateTime.now(),
+        config = ChannelConfig();
+
   /// Create a new instance from a json
   factory ChannelModel.fromJson(Map<String, dynamic>? json) =>
       _$ChannelModelFromJson(
@@ -38,11 +53,11 @@ class ChannelModel {
 
   /// The cid of this channel
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final String? cid;
+  final String cid;
 
   /// The channel configuration data
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final ChannelConfig? config;
+  final ChannelConfig config;
 
   /// The user that created this channel
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
@@ -50,7 +65,7 @@ class ChannelModel {
 
   /// True if this channel is frozen
   @JsonKey(includeIfNull: false)
-  final bool? frozen;
+  final bool frozen;
 
   /// The date of the last message
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
@@ -58,11 +73,11 @@ class ChannelModel {
 
   /// The date of channel creation
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final DateTime? createdAt;
+  final DateTime createdAt;
 
   /// The date of the last channel update
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final DateTime? updatedAt;
+  final DateTime updatedAt;
 
   /// The date of channel deletion
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
@@ -70,7 +85,7 @@ class ChannelModel {
 
   /// The count of this channel members
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final int? memberCount;
+  final int memberCount;
 
   /// Map of custom channel extraData
   @JsonKey(includeIfNull: false)

packages/stream_chat/lib/src/models/channel_model.g.dart

@@ -10,30 +10,24 @@ ChannelModel _$ChannelModelFromJson(Map json) {
   return ChannelModel(
     id: json['id'] as String?,
     type: json['type'] as String?,
-    cid: json['cid'] as String?,
+    cid: json['cid'] as String,
-    config: json['config'] == null
+    config: ChannelConfig.fromJson(
-        ? null
+        Map<String, dynamic>.from(json['config'] as Map)),
-        : ChannelConfig.fromJson(
-            Map<String, dynamic>.from(json['config'] as Map)),
     createdBy: json['created_by'] == null
         ? null
         : User.fromJson((json['created_by'] as Map?)?.map(
             (k, e) => MapEntry(k as String, e),
           )),
-    frozen: json['frozen'] as bool?,
+    frozen: json['frozen'] as bool,
     lastMessageAt: json['last_message_at'] == null
         ? null
         : DateTime.parse(json['last_message_at'] as String),
-    createdAt: json['created_at'] == null
+    createdAt: DateTime.parse(json['created_at'] as String),
-        ? null
+    updatedAt: DateTime.parse(json['updated_at'] as String),
-        : DateTime.parse(json['created_at'] as String),
-    updatedAt: json['updated_at'] == null
-        ? null
-        : DateTime.parse(json['updated_at'] as String),
     deletedAt: json['deleted_at'] == null
         ? null
         : DateTime.parse(json['deleted_at'] as String),
-    memberCount: json['member_count'] as int?,
+    memberCount: json['member_count'] as int,
     extraData: (json['extra_data'] as Map?)?.map(
       (k, e) => MapEntry(k as String, e),
     ),
@@ -56,7 +50,7 @@ Map<String, dynamic> _$ChannelModelToJson(ChannelModel instance) {
   writeNotNull('cid', readonly(instance.cid));
   writeNotNull('config', readonly(instance.config));
   writeNotNull('created_by', readonly(instance.createdBy));
-  writeNotNull('frozen', instance.frozen);
+  val['frozen'] = instance.frozen;
   writeNotNull('last_message_at', readonly(instance.lastMessageAt));
   writeNotNull('created_at', readonly(instance.createdAt));
   writeNotNull('updated_at', readonly(instance.updatedAt));

packages/stream_chat/lib/src/models/channel_state.dart

@@ -25,22 +25,22 @@ class ChannelState {
   final ChannelModel? channel;
 
   /// A paginated list of channel messages
-  final List<Message>? messages;
+  final List<Message> messages;
 
   /// A paginated list of channel members
-  final List<Member?>? members;
+  final List<Member?> members;
 
   /// A paginated list of pinned messages
-  final List<Message>? pinnedMessages;
+  final List<Message> pinnedMessages;
 
   /// The count of users watching the channel
   final int? watcherCount;
 
   /// A paginated list of users watching the channel
-  final List<User>? watchers;
+  final List<User> watchers;
 
   /// The list of channel reads
-  final List<Read>? read;
+  final List<Read> read;
 
   /// Create a new instance from a json
   static ChannelState fromJson(Map<String, dynamic> json) =>

packages/stream_chat/lib/src/models/channel_state.g.dart

@@ -13,29 +13,29 @@ ChannelState _$ChannelStateFromJson(Map json) {
         : ChannelModel.fromJson((json['channel'] as Map?)?.map(
             (k, e) => MapEntry(k as String, e),
           )),
-    messages: (json['messages'] as List<dynamic>?)
+    messages: (json['messages'] as List<dynamic>)
-        ?.map((e) => Message.fromJson((e as Map?)?.map(
+        .map((e) => Message.fromJson((e as Map?)?.map(
               (k, e) => MapEntry(k as String, e),
             )))
         .toList(),
-    members: (json['members'] as List<dynamic>?)
+    members: (json['members'] as List<dynamic>)
-        ?.map((e) => e == null
+        .map((e) => e == null
             ? null
             : Member.fromJson(Map<String, dynamic>.from(e as Map)))
         .toList(),
-    pinnedMessages: (json['pinned_messages'] as List<dynamic>?)
+    pinnedMessages: (json['pinned_messages'] as List<dynamic>)
-        ?.map((e) => Message.fromJson((e as Map?)?.map(
+        .map((e) => Message.fromJson((e as Map?)?.map(
               (k, e) => MapEntry(k as String, e),
             )))
         .toList(),
     watcherCount: json['watcher_count'] as int?,
-    watchers: (json['watchers'] as List<dynamic>?)
+    watchers: (json['watchers'] as List<dynamic>)
-        ?.map((e) => User.fromJson((e as Map?)?.map(
+        .map((e) => User.fromJson((e as Map?)?.map(
               (k, e) => MapEntry(k as String, e),
             )))
         .toList(),
-    read: (json['read'] as List<dynamic>?)
+    read: (json['read'] as List<dynamic>)
-        ?.map((e) => Read.fromJson(Map<String, dynamic>.from(e as Map)))
+        .map((e) => Read.fromJson(Map<String, dynamic>.from(e as Map)))
         .toList(),
   );
 }
@@ -43,11 +43,11 @@ ChannelState _$ChannelStateFromJson(Map json) {
 Map<String, dynamic> _$ChannelStateToJson(ChannelState instance) =>
     <String, dynamic>{
       'channel': instance.channel?.toJson(),
-      'messages': instance.messages?.map((e) => e.toJson()).toList(),
+      'messages': instance.messages.map((e) => e.toJson()).toList(),
-      'members': instance.members?.map((e) => e?.toJson()).toList(),
+      'members': instance.members.map((e) => e?.toJson()).toList(),
       'pinned_messages':
-          instance.pinnedMessages?.map((e) => e.toJson()).toList(),
+          instance.pinnedMessages.map((e) => e.toJson()).toList(),
       'watcher_count': instance.watcherCount,
-      'watchers': instance.watchers?.map((e) => e.toJson()).toList(),
+      'watchers': instance.watchers.map((e) => e.toJson()).toList(),
-      'read': instance.read?.map((e) => e.toJson()).toList(),
+      'read': instance.read.map((e) => e.toJson()).toList(),
     };

packages/stream_chat/lib/src/models/device.dart

@@ -7,7 +7,7 @@ part 'device.g.dart';
 class Device {
   /// Constructor used for json serialization
   Device({
-    this.id,
+    required this.id,
     this.pushProvider,
   });
 
@@ -15,7 +15,7 @@ class Device {
   factory Device.fromJson(Map<String, dynamic> json) => _$DeviceFromJson(json);
 
   /// The id of the device
-  final String? id;
+  final String id;
 
   /// The notification push provider
   final String? pushProvider;

packages/stream_chat/lib/src/models/device.g.dart

@@ -8,7 +8,7 @@ part of 'device.dart';
 
 Device _$DeviceFromJson(Map json) {
   return Device(
-    id: json['id'] as String?,
+    id: json['id'] as String,
     pushProvider: json['push_provider'] as String?,
   );
 }

packages/stream_chat/lib/src/models/event.dart

@@ -171,15 +171,15 @@ class EventChannel extends ChannelModel {
     this.members,
     String? id,
     String? type,
-    String? cid,
+    required String cid,
-    ChannelConfig? config,
+    required ChannelConfig config,
     User? createdBy,
-    bool? frozen,
+    bool frozen = false,
     DateTime? lastMessageAt,
-    DateTime? createdAt,
+    required DateTime createdAt,
-    DateTime? updatedAt,
+    required DateTime updatedAt,
     DateTime? deletedAt,
-    int? memberCount,
+    required int memberCount,
     Map<String, dynamic>? extraData,
   }) : super(
           id: id,

packages/stream_chat/lib/src/models/event.g.dart

@@ -92,30 +92,24 @@ EventChannel _$EventChannelFromJson(Map json) {
         .toList(),
     id: json['id'] as String?,
     type: json['type'] as String?,
-    cid: json['cid'] as String?,
+    cid: json['cid'] as String,
-    config: json['config'] == null
+    config: ChannelConfig.fromJson(
-        ? null
+        Map<String, dynamic>.from(json['config'] as Map)),
-        : ChannelConfig.fromJson(
-            Map<String, dynamic>.from(json['config'] as Map)),
     createdBy: json['created_by'] == null
         ? null
         : User.fromJson((json['created_by'] as Map?)?.map(
             (k, e) => MapEntry(k as String, e),
           )),
-    frozen: json['frozen'] as bool?,
+    frozen: json['frozen'] as bool,
     lastMessageAt: json['last_message_at'] == null
         ? null
         : DateTime.parse(json['last_message_at'] as String),
-    createdAt: json['created_at'] == null
+    createdAt: DateTime.parse(json['created_at'] as String),
-        ? null
+    updatedAt: DateTime.parse(json['updated_at'] as String),
-        : DateTime.parse(json['created_at'] as String),
-    updatedAt: json['updated_at'] == null
-        ? null
-        : DateTime.parse(json['updated_at'] as String),
     deletedAt: json['deleted_at'] == null
         ? null
         : DateTime.parse(json['deleted_at'] as String),
-    memberCount: json['member_count'] as int?,
+    memberCount: json['member_count'] as int,
     extraData: (json['extra_data'] as Map?)?.map(
       (k, e) => MapEntry(k as String, e),
     ),
@@ -137,7 +131,7 @@ Map<String, dynamic> _$EventChannelToJson(EventChannel instance) {
   writeNotNull('cid', readonly(instance.cid));
   writeNotNull('config', readonly(instance.config));
   writeNotNull('created_by', readonly(instance.createdBy));
-  writeNotNull('frozen', instance.frozen);
+  val['frozen'] = instance.frozen;
   writeNotNull('last_message_at', readonly(instance.lastMessageAt));
   writeNotNull('created_at', readonly(instance.createdAt));
   writeNotNull('updated_at', readonly(instance.updatedAt));

packages/stream_chat/lib/src/models/member.dart

@@ -12,14 +12,14 @@ class Member {
     this.user,
     this.inviteAcceptedAt,
     this.inviteRejectedAt,
-    this.invited,
+    this.invited = false,
-    this.role,
+    required this.role,
     this.userId,
     this.isModerator,
-    this.createdAt,
+    required this.createdAt,
-    this.updatedAt,
+    required this.updatedAt,
-    this.banned,
+    this.banned = false,
-    this.shadowBanned,
+    this.shadowBanned = false,
   });
 
   /// Create a new instance from a json
@@ -40,10 +40,10 @@ class Member {
   final DateTime? inviteRejectedAt;
 
   /// True if the user has been invited to the channel
-  final bool? invited;
+  final bool invited;
 
   /// The role of the user in the channel
-  final String? role;
+  final String role;
 
   /// The id of the interested user
   final String? userId;
@@ -52,16 +52,16 @@ class Member {
   final bool? isModerator;
 
   /// True if the member is banned from the channel
-  final bool? banned;
+  final bool banned;
 
   /// True if the member is shadow banned from the channel
-  final bool? shadowBanned;
+  final bool shadowBanned;
 
   /// The date of creation
-  final DateTime? createdAt;
+  final DateTime createdAt;
 
   /// The last date of update
-  final DateTime? updatedAt;
+  final DateTime updatedAt;
 
   /// Creates a copy of [Member] with specified attributes overridden.
   Member copyWith({

packages/stream_chat/lib/src/models/member.g.dart

@@ -19,18 +19,14 @@ Member _$MemberFromJson(Map json) {
     inviteRejectedAt: json['invite_rejected_at'] == null
         ? null
         : DateTime.parse(json['invite_rejected_at'] as String),
-    invited: json['invited'] as bool?,
+    invited: json['invited'] as bool,
-    role: json['role'] as String?,
+    role: json['role'] as String,
     userId: json['user_id'] as String?,
     isModerator: json['is_moderator'] as bool?,
-    createdAt: json['created_at'] == null
+    createdAt: DateTime.parse(json['created_at'] as String),
-        ? null
+    updatedAt: DateTime.parse(json['updated_at'] as String),
-        : DateTime.parse(json['created_at'] as String),
+    banned: json['banned'] as bool,
-    updatedAt: json['updated_at'] == null
+    shadowBanned: json['shadow_banned'] as bool,
-        ? null
-        : DateTime.parse(json['updated_at'] as String),
-    banned: json['banned'] as bool?,
-    shadowBanned: json['shadow_banned'] as bool?,
   );
 }
 
@@ -44,6 +40,6 @@ Map<String, dynamic> _$MemberToJson(Member instance) => <String, dynamic>{
       'is_moderator': instance.isModerator,
       'banned': instance.banned,
       'shadow_banned': instance.shadowBanned,
-      'created_at': instance.createdAt?.toIso8601String(),
+      'created_at': instance.createdAt.toIso8601String(),
-      'updated_at': instance.updatedAt?.toIso8601String(),
+      'updated_at': instance.updatedAt.toIso8601String(),
     };

packages/stream_chat/lib/src/models/message.dart

@@ -46,8 +46,8 @@ class Message extends Equatable {
   /// Constructor used for json serialization
   Message({
     String? id,
-    this.text,
+    required this.text,
-    this.type,
+    required this.type,
     this.attachments,
     this.mentionedUsers,
     this.silent,
@@ -63,8 +63,8 @@ class Message extends Equatable {
     this.threadParticipants,
     this.showInChannel,
     this.command,
-    this.createdAt,
+    required this.createdAt,
-    this.updatedAt,
+    required this.updatedAt,
     this.user,
     this.pinned = false,
     this.pinnedAt,
@@ -77,6 +77,40 @@ class Message extends Equatable {
   })  : id = id ?? const Uuid().v4(),
         pinExpires = pinExpires?.toUtc();
 
+  /// Constructor for creating temporary/throwaway message with id and text
+  Message.temp({
+    String? id,
+    required this.text,
+    this.attachments,
+    this.mentionedUsers,
+    this.silent,
+    this.shadowed,
+    this.reactionCounts,
+    this.reactionScores,
+    this.latestReactions,
+    this.ownReactions,
+    this.parentId,
+    this.quotedMessage,
+    this.quotedMessageId,
+    this.replyCount = 0,
+    this.threadParticipants,
+    this.showInChannel,
+    this.command,
+    this.user,
+    this.pinned = false,
+    this.pinnedAt,
+    DateTime? pinExpires,
+    this.pinnedBy,
+    this.extraData,
+    this.deletedAt,
+    this.status = MessageSendingStatus.sent,
+    this.skipPush,
+  })  : id = id ?? const Uuid().v4(),
+        pinExpires = pinExpires?.toUtc(),
+        createdAt = DateTime.now(),
+        updatedAt = DateTime.now(),
+        type = '';
+
   /// Create a new instance from a json
   factory Message.fromJson(Map<String, dynamic>? json) => _$MessageFromJson(
       Serialization.moveToExtraDataFromRoot(json, topLevelFields)!);
@@ -86,7 +120,7 @@ class Message extends Equatable {
   final String id;
 
   /// The text of this message
-  final String? text;
+  final String text;
 
   /// The status of a sending message
   @JsonKey(ignore: true)
@@ -94,7 +128,7 @@ class Message extends Equatable {
 
   /// The message type
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final String? type;
+  final String type;
 
   /// The list of attachments, either provided by the user or generated from a
   /// command or as a result of URL scraping.
@@ -158,11 +192,11 @@ class Message extends Equatable {
 
   /// Reserved field indicating when the message was created.
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final DateTime? createdAt;
+  final DateTime createdAt;
 
   /// Reserved field indicating when the message was updated last time.
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final DateTime? updatedAt;
+  final DateTime updatedAt;
 
   /// User who sent the message
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
@@ -384,7 +418,12 @@ class Message extends Equatable {
 @JsonSerializable()
 class TranslatedMessage extends Message {
   /// Constructor used for json serialization
-  TranslatedMessage(this.i18n);
+  TranslatedMessage(this.i18n)
+      : super(
+            createdAt: DateTime.now(),
+            updatedAt: DateTime.now(),
+            text: '',
+            type: '');
 
   /// Create a new instance from a json
   factory TranslatedMessage.fromJson(Map<String, dynamic>? json) =>

packages/stream_chat/lib/src/models/message.g.dart

@@ -9,8 +9,8 @@ part of 'message.dart';
 Message _$MessageFromJson(Map json) {
   return Message(
     id: json['id'] as String?,
-    text: json['text'] as String?,
+    text: json['text'] as String,
-    type: json['type'] as String?,
+    type: json['type'] as String,
     attachments: (json['attachments'] as List<dynamic>?)
         ?.map((e) => Attachment.fromJson(Map<String, dynamic>.from(e as Map)))
         .toList(),
@@ -52,12 +52,8 @@ Message _$MessageFromJson(Map json) {
         .toList(),
     showInChannel: json['show_in_channel'] as bool?,
     command: json['command'] as String?,
-    createdAt: json['created_at'] == null
+    createdAt: DateTime.parse(json['created_at'] as String),
-        ? null
+    updatedAt: DateTime.parse(json['updated_at'] as String),
-        : DateTime.parse(json['created_at'] as String),
-    updatedAt: json['updated_at'] == null
-        ? null
-        : DateTime.parse(json['updated_at'] as String),
     user: json['user'] == null
         ? null
         : User.fromJson((json['user'] as Map?)?.map(

packages/stream_chat/lib/src/models/own_user.dart

@@ -12,19 +12,19 @@ part 'own_user.g.dart';
 class OwnUser extends User {
   /// Constructor used for json serialization
   OwnUser({
-    this.devices,
+    this.devices = const [],
-    this.mutes,
+    this.mutes = const [],
-    this.totalUnreadCount,
+    this.totalUnreadCount = 0,
     this.unreadChannels,
-    this.channelMutes,
+    this.channelMutes = const [],
-    String? id,
+    required String id,
-    String? role,
+    required String role,
-    DateTime? createdAt,
+    required DateTime createdAt,
-    DateTime? updatedAt,
+    required DateTime updatedAt,
     DateTime? lastActive,
-    bool? online,
+    bool online = false,
-    Map<String, dynamic>? extraData,
+    Map<String, dynamic> extraData = const {},
-    bool? banned,
+    bool banned = false,
   }) : super(
           id: id,
           role: role,
@@ -36,25 +36,45 @@ class OwnUser extends User {
           banned: banned,
         );
 
+  /// Create a temporary/throwaway user with an ID
+  OwnUser.temp({
+    required String id,
+    this.devices = const [],
+    this.mutes = const [],
+    this.totalUnreadCount = 0,
+    this.unreadChannels,
+    this.channelMutes = const [],
+    DateTime? lastActive,
+    bool online = false,
+    Map<String, dynamic> extraData = const {},
+    bool banned = false,
+  }) : super.temp(
+          id: id,
+          lastActive: lastActive,
+          online: online,
+          extraData: extraData,
+          banned: banned,
+        );
+
   /// Create a new instance from a json
   factory OwnUser.fromJson(Map<String, dynamic>? json) => _$OwnUserFromJson(
       Serialization.moveToExtraDataFromRoot(json, topLevelFields)!);
 
   /// List of user devices
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final List<Device>? devices;
+  final List<Device> devices;
 
   /// List of users muted by the user
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final List<Mute>? mutes;
+  final List<Mute> mutes;
 
   /// List of users muted by the user
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final List<Mute>? channelMutes;
+  final List<Mute> channelMutes;
 
   /// Total unread messages by the user
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final int? totalUnreadCount;
+  final int totalUnreadCount;
 
   /// Total unread channels by the user
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)

packages/stream_chat/lib/src/models/own_user.g.dart

@@ -7,34 +7,29 @@ part of 'own_user.dart';
 // **************************************************************************
 
 OwnUser _$OwnUserFromJson(Map json) {
+  print(json);
   return OwnUser(
-    devices: (json['devices'] as List<dynamic>?)
+    devices: (json['devices'] as List<dynamic>)
-        ?.map((e) => Device.fromJson(Map<String, dynamic>.from(e as Map)))
+        .map((e) => Device.fromJson(Map<String, dynamic>.from(e as Map)))
         .toList(),
-    mutes: (json['mutes'] as List<dynamic>?)
+    mutes: (json['mutes'] as List<dynamic>)
-        ?.map((e) => Mute.fromJson(Map<String, dynamic>.from(e as Map)))
+        .map((e) => Mute.fromJson(Map<String, dynamic>.from(e as Map)))
         .toList(),
-    totalUnreadCount: json['total_unread_count'] as int?,
+    totalUnreadCount: json['total_unread_count'] as int,
     unreadChannels: json['unread_channels'] as int?,
-    channelMutes: (json['channel_mutes'] as List<dynamic>?)
+    channelMutes: (json['channel_mutes'] as List<dynamic>)
-        ?.map((e) => Mute.fromJson(Map<String, dynamic>.from(e as Map)))
+        .map((e) => Mute.fromJson(Map<String, dynamic>.from(e as Map)))
         .toList(),
-    id: json['id'] as String?,
+    id: json['id'] as String,
-    role: json['role'] as String?,
+    role: json['role'] as String,
-    createdAt: json['created_at'] == null
+    createdAt: DateTime.parse(json['created_at'] as String),
-        ? null
+    updatedAt: DateTime.parse(json['updated_at'] as String),
-        : DateTime.parse(json['created_at'] as String),
-    updatedAt: json['updated_at'] == null
-        ? null
-        : DateTime.parse(json['updated_at'] as String),
     lastActive: json['last_active'] == null
         ? null
         : DateTime.parse(json['last_active'] as String),
-    online: json['online'] as bool?,
+    online: json['online'] as bool,
-    extraData: (json['extra_data'] as Map?)?.map(
+    extraData: Map<String, dynamic>.from(json['extra_data'] as Map),
-      (k, e) => MapEntry(k as String, e),
+    banned: json['banned'] as bool,
-    ),
-    banned: json['banned'] as bool?,
   );
 }
 
@@ -55,7 +50,7 @@ Map<String, dynamic> _$OwnUserToJson(OwnUser instance) {
   writeNotNull('last_active', readonly(instance.lastActive));
   writeNotNull('online', readonly(instance.online));
   writeNotNull('banned', readonly(instance.banned));
-  writeNotNull('extra_data', instance.extraData);
+  val['extra_data'] = instance.extraData;
   writeNotNull('devices', readonly(instance.devices));
   writeNotNull('mutes', readonly(instance.mutes));
   writeNotNull('channel_mutes', readonly(instance.channelMutes));

packages/stream_chat/lib/src/models/reaction.dart

@@ -10,13 +10,13 @@ class Reaction {
   /// Constructor used for json serialization
   Reaction({
     this.messageId,
-    this.createdAt,
+    required this.createdAt,
-    this.type,
+    required this.type,
-    this.user,
+    required this.user,
     String? userId,
-    this.score,
+    required this.score,
     this.extraData,
-  }) : userId = userId ?? user?.id;
+  }) : userId = userId ?? user.id;
 
   /// Create a new instance from a json
   factory Reaction.fromJson(Map<String, dynamic>? json) => _$ReactionFromJson(
@@ -26,18 +26,18 @@ class Reaction {
   final String? messageId;
 
   /// The type of the reaction
-  final String? type;
+  final String type;
 
   /// The date of the reaction
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final DateTime? createdAt;
+  final DateTime createdAt;
 
   /// The user that sent the reaction
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final User? user;
+  final User user;
 
   /// The score of the reaction (ie. number of reactions sent)
-  final int? score;
+  final int score;
 
   /// The userId that sent the reaction
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)

packages/stream_chat/lib/src/models/reaction.g.dart

@@ -9,17 +9,13 @@ part of 'reaction.dart';
 Reaction _$ReactionFromJson(Map json) {
   return Reaction(
     messageId: json['message_id'] as String?,
-    createdAt: json['created_at'] == null
+    createdAt: DateTime.parse(json['created_at'] as String),
-        ? null
+    type: json['type'] as String,
-        : DateTime.parse(json['created_at'] as String),
+    user: User.fromJson((json['user'] as Map?)?.map(
-    type: json['type'] as String?,
+      (k, e) => MapEntry(k as String, e),
-    user: json['user'] == null
+    )),
-        ? null
-        : User.fromJson((json['user'] as Map?)?.map(
-            (k, e) => MapEntry(k as String, e),
-          )),
     userId: json['user_id'] as String?,
-    score: json['score'] as int?,
+    score: json['score'] as int,
     extraData: (json['extra_data'] as Map?)?.map(
       (k, e) => MapEntry(k as String, e),
     ),

packages/stream_chat/lib/src/models/read.dart

@@ -8,22 +8,22 @@ part 'read.g.dart';
 class Read {
   /// Constructor used for json serialization
   Read({
-    this.lastRead,
+    required this.lastRead,
-    this.user,
+    required this.user,
-    this.unreadMessages,
+    required this.unreadMessages,
   });
 
   /// Create a new instance from a json
   factory Read.fromJson(Map<String, dynamic> json) => _$ReadFromJson(json);
 
   /// Date of the read event
-  final DateTime? lastRead;
+  final DateTime lastRead;
 
   /// User who sent the event
-  final User? user;
+  final User user;
 
   /// Number of unread messages
-  final int? unreadMessages;
+  final int unreadMessages;
 
   /// Serialize to json
   Map<String, dynamic> toJson() => _$ReadToJson(this);

packages/stream_chat/lib/src/models/read.g.dart

@@ -8,20 +8,16 @@ part of 'read.dart';
 
 Read _$ReadFromJson(Map json) {
   return Read(
-    lastRead: json['last_read'] == null
+    lastRead: DateTime.parse(json['last_read'] as String),
-        ? null
+    user: User.fromJson((json['user'] as Map?)?.map(
-        : DateTime.parse(json['last_read'] as String),
+      (k, e) => MapEntry(k as String, e),
-    user: json['user'] == null
+    )),
-        ? null
+    unreadMessages: json['unread_messages'] as int,
-        : User.fromJson((json['user'] as Map?)?.map(
-            (k, e) => MapEntry(k as String, e),
-          )),
-    unreadMessages: json['unread_messages'] as int?,
   );
 }
 
 Map<String, dynamic> _$ReadToJson(Read instance) => <String, dynamic>{
-      'last_read': instance.lastRead?.toIso8601String(),
+      'last_read': instance.lastRead.toIso8601String(),
-      'user': instance.user?.toJson(),
+      'user': instance.user.toJson(),
       'unread_messages': instance.unreadMessages,
     };

packages/stream_chat/lib/src/models/user.dart

@@ -8,17 +8,29 @@ part 'user.g.dart';
 class User {
   /// Constructor used for json serialization
   User({
-    this.id,
+    required this.id,
-    this.role,
+    required this.role,
-    this.createdAt,
+    required this.createdAt,
-    this.updatedAt,
+    required this.updatedAt,
     this.lastActive,
-    this.online,
+    this.online = false,
-    this.extraData,
+    this.extraData = const {},
-    this.banned,
+    this.banned = false,
-    this.teams,
+    this.teams = const [],
   });
 
+  /// Use constructor for a temporary/throwaway user with an ID
+  User.temp({
+    required this.id,
+    this.role = '',
+    this.lastActive,
+    this.online = false,
+    this.extraData = const {},
+    this.banned = false,
+    this.teams = const [],
+  })  : createdAt = DateTime.now(),
+        updatedAt = DateTime.now();
+
   /// Create a new instance from a json
   factory User.fromJson(Map<String, dynamic>? json) => _$UserFromJson(
       Serialization.moveToExtraDataFromRoot(json, topLevelFields)!);
@@ -26,14 +38,14 @@ class User {
   /// Use this named constructor to create a new user instance
   User.init(
     this.id, {
-    this.online,
+    this.online = false,
-    this.extraData,
+    this.extraData = const {},
-  })  : createdAt = null,
+    required this.createdAt,
-        updatedAt = null,
+    required this.updatedAt,
-        lastActive = null,
+    this.teams = const [],
-        banned = null,
+    required this.role,
-        teams = null,
+  })   : lastActive = null,
-        role = null;
+        banned = false;
 
   /// Known top level fields.
   /// Useful for [Serialization] methods.
@@ -49,23 +61,23 @@ class User {
   ];
 
   /// User id
-  final String? id;
+  final String id;
 
   /// User role
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final String? role;
+  final String role;
 
   /// User role
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final List<String>? teams;
+  final List<String> teams;
 
   /// Date of user creation
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final DateTime? createdAt;
+  final DateTime createdAt;
 
   /// Date of last user update
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final DateTime? updatedAt;
+  final DateTime updatedAt;
 
   /// Date of last user connection
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
@@ -73,23 +85,23 @@ class User {
 
   /// True if user is online
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final bool? online;
+  final bool online;
 
   /// True if user is banned from the chat
   @JsonKey(includeIfNull: false, toJson: Serialization.readOnly)
-  final bool? banned;
+  final bool banned;
 
   /// Map of custom user extraData
   @JsonKey(includeIfNull: false)
-  final Map<String, dynamic>? extraData;
+  final Map<String, dynamic> extraData;
 
   @override
   int get hashCode => id.hashCode;
 
   /// Shortcut for user name
   String? get name =>
-      (extraData?.containsKey('name') == true && extraData!['name'] != '')
+      (extraData.containsKey('name') == true && extraData['name'] != '')
-          ? extraData!['name']
+          ? extraData['name']
           : id;
 
   @override

packages/stream_chat/lib/src/models/user.g.dart

@@ -8,23 +8,17 @@ part of 'user.dart';
 
 User _$UserFromJson(Map json) {
   return User(
-    id: json['id'] as String?,
+    id: json['id'] as String,
-    role: json['role'] as String?,
+    role: json['role'] as String,
-    createdAt: json['created_at'] == null
+    createdAt: DateTime.parse(json['created_at'] as String),
-        ? null
+    updatedAt: DateTime.parse(json['updated_at'] as String),
-        : DateTime.parse(json['created_at'] as String),
-    updatedAt: json['updated_at'] == null
-        ? null
-        : DateTime.parse(json['updated_at'] as String),
     lastActive: json['last_active'] == null
         ? null
         : DateTime.parse(json['last_active'] as String),
-    online: json['online'] as bool?,
+    online: json['online'] as bool,
-    extraData: (json['extra_data'] as Map?)?.map(
+    extraData: Map<String, dynamic>.from(json['extra_data'] as Map),
-      (k, e) => MapEntry(k as String, e),
+    banned: json['banned'] as bool,
-    ),
+    teams: (json['teams'] as List<dynamic>).map((e) => e as String).toList(),
-    banned: json['banned'] as bool?,
-    teams: (json['teams'] as List<dynamic>?)?.map((e) => e as String).toList(),
   );
 }
 
@@ -46,6 +40,6 @@ Map<String, dynamic> _$UserToJson(User instance) {
   writeNotNull('last_active', readonly(instance.lastActive));
   writeNotNull('online', readonly(instance.online));
   writeNotNull('banned', readonly(instance.banned));
-  writeNotNull('extra_data', instance.extraData);
+  val['extra_data'] = instance.extraData;
   return val;
 }

packages/stream_chat/test/src/api/channel_test.dart

@@ -35,7 +35,7 @@ void main() {
           tokenProvider: (_) async => '',
         );
         final channelClient = client.channel('messaging', id: 'testid');
-        final message = Message(text: 'hey', id: 'test');
+        final message = Message.temp(text: 'hey', id: 'test');
 
         when(
           () => mockDio.post<String>(
@@ -168,7 +168,7 @@ void main() {
               requestOptions: FakeRequestOptions(),
             ));
 
-        await channelClient.sendAction(Message(id: 'messageid'), data);
+        await channelClient.sendAction(Message.temp(id: 'messageid', text: ''), data);
 
         verify(() => mockDio.post<String>('/messages/messageid/action', data: {
               'id': 'testid',
@@ -334,7 +334,7 @@ void main() {
 
         final channelClient = client.channel('messaging', id: 'testid');
 
-        final message = Message(text: 'Hello');
+        final message = Message.temp(text: 'Hello');
 
         expect(
           () => channelClient.pinMessage(message, 'InvalidType'),
@@ -354,7 +354,7 @@ void main() {
           tokenProvider: (_) async => '',
         );
         final channelClient = client.channel('messaging', id: 'testid');
-        final message = Message(text: 'Hello', id: 'test');
+        final message = Message.temp(text: 'Hello', id: 'test');
 
         when(
           () => mockDio.post<String>(
@@ -388,7 +388,7 @@ void main() {
           tokenProvider: (_) async => '',
         );
         final channelClient = client.channel('messaging', id: 'testid');
-        final message = Message(text: 'Hello', id: 'test');
+        final message = Message.temp(text: 'Hello', id: 'test');
 
         when(
           () => mockDio.post<String>(
@@ -566,7 +566,7 @@ void main() {
           tokenProvider: (_) async => '',
         );
 
-        client.state?.user = OwnUser(id: 'test-id');
+        client.state?.user = OwnUser.temp(id: 'test-id');
 
         final channelClient = client.channel('messaging', id: 'testid');
         const reactionType = 'test';
@@ -590,8 +590,9 @@ void main() {
         );
 
         await channelClient.sendReaction(
-          Message(
+          Message.temp(
             id: 'messageid',
+            text: '',
             reactionCounts: const <String, int>{},
             reactionScores: const <String, int>{},
             latestReactions: const <Reaction>[],
@@ -621,7 +622,7 @@ void main() {
           tokenProvider: (_) async => '',
         );
 
-        client.state?.user = OwnUser(id: 'test-id');
+        client.state?.user = OwnUser.temp(id: 'test-id');
 
         final channelClient = client.channel('messaging', id: 'testid');
 
@@ -636,14 +637,22 @@ void main() {
         );
 
         await channelClient.deleteReaction(
-          Message(
+          Message.temp(
             id: 'messageid',
+            text: '',
             reactionCounts: const <String, int>{},
             reactionScores: const <String, int>{},
             latestReactions: const <Reaction>[],
             ownReactions: const <Reaction>[],
           ),
-          Reaction(type: 'test'),
+          Reaction(
+            type: 'test',
+            createdAt: DateTime.now(),
+            score: 0,
+            user: User.temp(
+              id: client.state?.user?.id ?? '',
+            ),
+          ),
         );
 
         verify(() =>
@@ -699,7 +708,7 @@ void main() {
         );
         final channelClient = client.channel('messaging', id: 'testid');
         final members = ['vishal'];
-        final message = Message(text: 'test');
+        final message = Message.temp(text: 'test');
 
         when(
           () => mockDio.post<String>(
@@ -733,7 +742,7 @@ void main() {
           tokenProvider: (_) async => '',
         );
         final channelClient = client.channel('messaging', id: 'testid');
-        final message = Message(text: 'test');
+        final message = Message.temp(text: 'test');
 
         when(
           () => mockDio.post<String>(
@@ -2081,7 +2090,7 @@ void main() {
           tokenProvider: (_) async => '',
         );
         final channelClient = client.channel('messaging', id: 'testid');
-        final message = Message(text: 'test');
+        final message = Message.temp(text: 'test');
 
         when(
           () => mockDio.post<String>(
@@ -2180,7 +2189,7 @@ void main() {
           tokenProvider: (_) async => '',
         );
         final channelClient = client.channel('messaging', id: 'testid');
-        final message = Message(text: 'test');
+        final message = Message.temp(text: 'test');
 
         when(
           () => mockDio.post<String>(
@@ -2215,7 +2224,7 @@ void main() {
         );
         final channelClient = client.channel('messaging', id: 'testid');
         final members = ['vishal'];
-        final message = Message(text: 'test');
+        final message = Message.temp(text: 'test');
 
         when(
           () => mockDio.post<String>(
@@ -2249,7 +2258,7 @@ void main() {
         );
         final channelClient = client.channel('messaging', id: 'testid');
         final members = ['vishal'];
-        final message = Message(text: 'test');
+        final message = Message.temp(text: 'test');
 
         when(
           () => mockDio.post<String>(

packages/stream_chat/test/src/api/websocket_test.dart

@@ -38,7 +38,7 @@ void main() {
       final ConnectWebSocket connectFunc = MockFunctions().connectFunc;
       final ws = WebSocket(
         baseUrl: 'baseurl',
-        user: User(id: 'testid'),
+        user: User.temp(id: 'testid'),
         logger: Logger('ws'),
         connectParams: {'test': 'true'},
         connectPayload: {'payload': 'test'},
@@ -76,7 +76,7 @@ void main() {
     final ConnectWebSocket connectFunc = MockFunctions().connectFunc;
     final ws = WebSocket(
       baseUrl: 'baseurl',
-      user: User(id: 'testid'),
+      user: User.temp(id: 'testid'),
       logger: Logger('ws'),
       connectParams: {'test': 'true'},
       connectPayload: {'payload': 'test'},
@@ -112,7 +112,7 @@ void main() {
     final ConnectWebSocket connectFunc = MockFunctions().connectFunc;
     final ws = WebSocket(
       baseUrl: 'baseurl',
-      user: User(id: 'testid'),
+      user: User.temp(id: 'testid'),
       logger: Logger('ws'),
       connectParams: {'test': 'true'},
       connectPayload: {'payload': 'test'},
@@ -150,7 +150,7 @@ void main() {
 
     final ws = WebSocket(
       baseUrl: 'baseurl',
-      user: User(id: 'testid'),
+      user: User.temp(id: 'testid'),
       logger: Logger('ws'),
       connectParams: {'test': 'true'},
       connectPayload: {'payload': 'test'},
@@ -184,7 +184,7 @@ void main() {
     final ConnectWebSocket connectFunc = MockFunctions().connectFunc;
     final ws = WebSocket(
       baseUrl: 'baseurl',
-      user: User(id: 'testid'),
+      user: User.temp(id: 'testid'),
       logger: Logger('ws'),
       connectParams: {'test': 'true'},
       connectPayload: {'payload': 'test'},
@@ -229,7 +229,7 @@ void main() {
     Logger.root.level = Level.ALL;
     final ws = WebSocket(
       baseUrl: 'baseurl',
-      user: User(id: 'testid'),
+      user: User.temp(id: 'testid'),
       logger: Logger('ws'),
       connectParams: {'test': 'true'},
       connectPayload: {'payload': 'test'},
@@ -273,7 +273,7 @@ void main() {
     final ConnectWebSocket connectFunc = MockFunctions().connectFunc;
     final ws = WebSocket(
       baseUrl: 'baseurl',
-      user: User(id: 'testid'),
+      user: User.temp(id: 'testid'),
       logger: Logger('ws'),
       connectParams: {'test': 'true'},
       connectPayload: {'payload': 'test'},
@@ -310,7 +310,7 @@ void main() {
     final ConnectWebSocket connectFunc = MockFunctions().connectFunc;
     final ws = WebSocket(
       baseUrl: 'baseurl',
-      user: User(id: 'testid'),
+      user: User.temp(id: 'testid'),
       logger: Logger('ws'),
       connectParams: {'test': 'true'},
       connectPayload: {'payload': 'test'},

packages/stream_chat/test/src/client_test.dart

@@ -479,7 +479,7 @@ void main() {
 
         final client = StreamChatClient('api-key', httpClient: mockDio);
 
-        expect(() => client.connectUserWithProvider(User(id: 'test-id')),
+        expect(() => client.connectUserWithProvider(User.temp(id: 'test-id')),
             throwsA(isA<Exception>()));
       });
 
@@ -517,7 +517,7 @@ void main() {
         when(() => mockDio.interceptors).thenReturn(Interceptors());
 
         final client = StreamChatClient('api-key', httpClient: mockDio);
-        final user = User(id: 'test-id');
+        final user = User.temp(id: 'test-id');
         final data = {
           'users': {user.id: user.toJson()},
         };
@@ -542,8 +542,8 @@ void main() {
         when(() => mockDio.interceptors).thenReturn(Interceptors());
 
         final client = StreamChatClient('api-key', httpClient: mockDio);
-        final user = User(id: 'test-id');
+        final user = User.temp(id: 'test-id');
-        final user2 = User(id: 'test-id2');
+        final user2 = User.temp(id: 'test-id2');
 
         final data = {
           'users': {
@@ -737,7 +737,13 @@ void main() {
         when(() => mockDio.interceptors).thenReturn(Interceptors());
 
         final client = StreamChatClient('api-key', httpClient: mockDio);
-        final message = Message(id: 'test', updatedAt: DateTime.now());
+        final message = Message(
+          id: 'test',
+          updatedAt: DateTime.now(),
+          createdAt: DateTime.now(),
+          text: '',
+          type: '',
+        );
 
         when(
           () => mockDio.post<String>(
@@ -775,7 +781,7 @@ void main() {
           ),
         );
 
-        await client.deleteMessage(Message(id: messageId));
+        await client.deleteMessage(Message.temp(id: messageId, text: ''));
 
         verify(() => mockDio.delete<String>('/messages/$messageId')).called(1);
       });
@@ -1095,7 +1101,7 @@ void main() {
         );
 
         test('should throw argument error', () {
-          final message = Message(text: 'Hello');
+          final message = Message.temp(text: 'Hello');
           expect(
             () => client.pinMessage(message, 'InvalidType'),
             throwsArgumentError,
@@ -1104,7 +1110,7 @@ void main() {
 
         test('should complete successfully', () async {
           const timeout = 30;
-          final message = Message(text: 'Hello');
+          final message = Message.temp(text: 'Hello');
 
           when(
             () => mockDio.post<String>(
@@ -1126,7 +1132,7 @@ void main() {
         });
 
         test('should unpin message successfully', () async {
-          final message = Message(text: 'Hello');
+          final message = Message.temp(text: 'Hello');
 
           when(
             () => mockDio.post<String>(

packages/stream_chat/test/src/models/channel_state_test.dart

@@ -1330,10 +1330,10 @@ void main() {
         members: [],
         messages:
             (j['messages'] as List).map((m) => Message.fromJson(m)).toList(),
-        read: null,
+        read: [],
         watcherCount: 5,
         pinnedMessages: [],
-        watchers: null,
+        watchers: [],
       );
 
       expect(

packages/stream_chat/test/src/models/channel_test.dart

@@ -25,7 +25,7 @@ void main() {
     });
 
     test('should serialize to json correctly', () {
-      final channel = ChannelModel(
+      final channel = ChannelModel.temp(
         type: 'type',
         id: 'id',
         cid: 'a:a',
@@ -39,7 +39,7 @@ void main() {
     });
 
     test('should serialize to json correctly when frozen is provided', () {
-      final channel = ChannelModel(
+      final channel = ChannelModel.temp(
         type: 'type',
         id: 'id',
         cid: 'a:a',

packages/stream_chat/test/src/models/event_test.dart

@@ -51,12 +51,12 @@ void main() {
 
     test('should serialize to json correctly', () {
       final event = Event(
-        user: User(id: 'id'),
+        user: User.temp(id: 'id'),
         type: 'type',
         cid: 'cid',
         connectionId: 'connectionId',
         createdAt: DateTime.parse('2020-01-29T03:22:47.63613Z'),
-        me: OwnUser(id: 'id2'),
+        me: OwnUser.temp(id: 'id2'),
         totalUnreadCount: 1,
         unreadChannels: 1,
         online: true,

packages/stream_chat/test/src/models/message_test.dart

@@ -97,7 +97,7 @@ void main() {
     });
 
     test('should serialize to json correctly', () {
-      final message = Message(
+      final message = Message.temp(
         id: '4637f7e4-a06b-42db-ba5a-8d8270dd926f',
         text:
             'https://giphy.com/gifs/the-lion-king-live-action-5zvN79uTGfLMOVfQaA',

packages/stream_chat/test/src/models/reaction_test.dart

@@ -33,8 +33,8 @@ void main() {
       expect(reaction.createdAt, DateTime.parse('2020-01-28T22:17:31.108742Z'));
       expect(reaction.type, 'wow');
       expect(
-        reaction.user?.toJson(),
+        reaction.user.toJson(),
-        User.init('2de0297c-f3f2-489d-b930-ef77342edccf', extraData: {
+        User.temp(id:'2de0297c-f3f2-489d-b930-ef77342edccf', extraData: {
           'image': 'https://randomuser.me/api/portraits/women/45.jpg',
           'name': 'Daisy Morgan'
         }).toJson(),
@@ -49,7 +49,7 @@ void main() {
         messageId: '76cd8c82-b557-4e48-9d12-87995d3a0e04',
         createdAt: DateTime.parse('2020-01-28T22:17:31.108742Z'),
         type: 'wow',
-        user: User.init('2de0297c-f3f2-489d-b930-ef77342edccf', extraData: {
+        user: User.temp(id:'2de0297c-f3f2-489d-b930-ef77342edccf', extraData: {
           'image': 'https://randomuser.me/api/portraits/women/45.jpg',
           'name': 'Daisy Morgan'
         }),

packages/stream_chat/test/src/models/read_test.dart

@@ -26,7 +26,7 @@ void main() {
     test('should serialize to json correctly', () {
       final read = Read(
         lastRead: DateTime.parse('2020-01-28T22:17:30.966485504Z'),
-        user: User.init('bbb19d9a-ee50-45bc-84e5-0584e79d0c9e'),
+        user: User.temp(id: 'bbb19d9a-ee50-45bc-84e5-0584e79d0c9e'),
         unreadMessages: 10,
       );
 

packages/stream_chat/test/src/models/user_test.dart

@@ -17,7 +17,7 @@ void main() {
     });
 
     test('should serialize to json correctly', () {
-      final user = User(
+      final user = User.temp(
         id: 'bbb19d9a-ee50-45bc-84e5-0584e79d0c9e',
         role: 'abc',
       );