feat: [chat] Support force notify and silent notification option for CreateMessage

packages/google-chat/.eslintignore

@@ -0,0 +1,7 @@
+**/node_modules
+**/.coverage
+build/
+docs/
+protos/
+system-test/
+samples/generated/

packages/google-chat/.eslintrc.json

@@ -0,0 +1,4 @@
+{
+  "extends": "./node_modules/gts",
+  "root": true
+}

packages/google-chat/.prettierignore

@@ -0,0 +1,6 @@
+**/node_modules
+**/coverage
+test/fixtures
+build/
+docs/
+protos/

packages/google-chat/.prettierrc.js

@@ -0,0 +1,22 @@
+// Copyright 2026 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// ** This file is automatically generated by gapic-generator-typescript. **
+// ** https://github.com/googleapis/gapic-generator-typescript **
+// ** All changes to this file may be overwritten. **
+
+
+module.exports = {
+  ...require('gts/.prettierrc.json')
+}

packages/google-chat/protos/google/chat/v1/message.proto

@@ -204,6 +204,10 @@ message Message {
   // `false`.
   bool thread_reply = 25 [(google.api.field_behavior) = OUTPUT_ONLY];
 
+  // Output only. Whether this is a silent message. Silent messages are messages
+  // where Chat suppresses push notifications for recipients.
+  bool silent = 46 [(google.api.field_behavior) = OUTPUT_ONLY];
+
   // Optional. A custom ID for the message. You can use field to identify a
   // message, or to get, delete, or update a message. To set a custom ID,
   // specify the
@@ -646,6 +650,43 @@ message CreateMessageRequest {
   // For details, see [Name a
   // message](https://developers.google.com/workspace/chat/create-messages#name_a_created_message).
   string message_id = 9 [(google.api.field_behavior) = OPTIONAL];
+
+  // Optional. Controls the notification behavior when the message is posted.
+  // To learn more, see [Force notifications or send silent
+  // messages](https://developer.google.com/workspace/chat/create-messages#force-notify-silent).
+  CreateMessageNotificationOptions create_message_notification_options = 10
+      [(google.api.field_behavior) = OPTIONAL];
+}
+
+// Options for the notification behavior when the message is posted.
+message CreateMessageNotificationOptions {
+  // The notification types options for the message.
+  enum NotificationType {
+    // Default behavior. Notification behavior is similar to when the human user
+    // sends the message using the Chat UI: no notification is sent to the
+    // human sender.
+    NOTIFICATION_TYPE_NONE = 0;
+
+    // Force notify recipients. This bypasses users' space notification settings
+    // and [Chat Do Not Disturb
+    // settings](https://support.google.com/chat/answer/9093489). This option
+    // does not bypass device-level Do Not Disturb settings.
+    //
+    // Requires [app authentication]
+    // (https://developers.google.com/workspace/chat/authenticate-authorize-chat-app).
+    NOTIFICATION_TYPE_FORCE_NOTIFY = 2;
+
+    // Silence the notification as if the recipients have [Chat Do Not
+    // Disturb](https://support.google.com/chat/answer/9093489) enabled or
+    // have muted the space.
+    //
+    // Requires [app authentication]
+    // (https://developers.google.com/workspace/chat/authenticate-authorize-chat-app).
+    NOTIFICATION_TYPE_SILENT = 3;
+  }
+
+  // The notification type for the message.
+  NotificationType notification_type = 1;
 }
 
 // Lists messages in the specified space, that the user is a member of.