feat(llc): add additional parameters to channel.truncate

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

@@ -1033,10 +1033,23 @@ class Channel {
     return _client.deleteChannel(id!, type);
   }
 
-  /// Removes all messages from the channel.
+  /// Removes all messages from the channel up to [truncatedAt] or now if
-  Future<EmptyResponse> truncate() async {
+  /// [truncatedAt] is not provided.
+  /// If [skipPush] is true, no push notification will be sent.
+  /// [Message] is the system message that will be sent to the channel.
+  Future<EmptyResponse> truncate({
+    Message? message,
+    bool? skipPush,
+    DateTime? truncatedAt,
+  }) async {
     _checkInitialized();
-    return _client.truncateChannel(id!, type);
+    return _client.truncateChannel(
+      id!,
+      type,
+      message: message,
+      skipPush: skipPush,
+      truncatedAt: truncatedAt,
+    );
   }
 
   /// Accept invitation to the channel.

packages/stream_chat/lib/src/client/client.dart

@@ -938,14 +938,23 @@ class StreamChatClient {
         channelType,
       );
 
-  /// Removes all messages from the channel
+  /// Removes all messages from the channel up to [truncatedAt] or now if
+  /// [truncatedAt] is not provided.
+  /// If [skipPush] is true, no push notification will be sent.
+  /// [Message] is the system message that will be sent to the channel.
   Future<EmptyResponse> truncateChannel(
     String channelId,
-    String channelType,
+    String channelType, {
-  ) =>
+    Message? message,
+    bool? skipPush,
+    DateTime? truncatedAt,
+  }) =>
       _chatApi.channel.truncateChannel(
         channelId,
         channelType,
+        message: message,
+        skipPush: skipPush,
+        truncatedAt: truncatedAt,
       );
 
   /// Mutes the channel

packages/stream_chat/lib/src/core/api/channel_api.dart

@@ -265,10 +265,18 @@ class ChannelApi {
   /// Removes all messages from the channel
   Future<EmptyResponse> truncateChannel(
     String channelId,
-    String channelType,
+    String channelType, {
-  ) async {
+    Message? message,
+    bool? skipPush,
+    DateTime? truncatedAt,
+  }) async {
     final response = await _client.post(
       '${_getChannelUrl(channelId, channelType)}/truncate',
+      data: {
+        if (message != null) 'message': message,
+        if (skipPush != null) 'skip_push': skipPush,
+        if (truncatedAt != null) 'truncated_at': truncatedAt,
+      },
     );
     return EmptyResponse.fromJson(response.data);
   }

packages/stream_chat/test/src/core/api/channel_api_test.dart

@@ -481,14 +481,21 @@ void main() {
 
     final path = '${_getChannelUrl(channelId, channelType)}/truncate';
 
-    when(() => client.post(path)).thenAnswer(
+    when(() => client.post(
-        (_) async => successResponse(path, data: <String, dynamic>{}));
+              path,
+              data: {},
+            ))
+        .thenAnswer(
+            (_) async => successResponse(path, data: <String, dynamic>{}));
 
     final res = await channelApi.truncateChannel(channelId, channelType);
 
     expect(res, isNotNull);
 
-    verify(() => client.post(path)).called(1);
+    verify(() => client.post(
+          path,
+          data: {},
+        )).called(1);
     verifyNoMoreInteractions(client);
   });