feat: add messages new api res

.cspell.json

@@ -602,7 +602,8 @@
     "pyroscope",
     "HEAY",
     "Pyroscope",
-    "PYROSCOPE"
+    "PYROSCOPE",
+    "usecases"
   ],
   "flagWords": [],
   "patterns": [

apps/api/src/app/messages/usecases/get-messages/get-messages.usecase.ts

@@ -1,13 +1,18 @@
 import { BadRequestException, Injectable } from '@nestjs/common';
 import { MessageEntity, MessageRepository, SubscriberEntity } from '@novu/dal';
-import { ActorTypeEnum } from '@novu/shared';
+import { ActorTypeEnum, FeatureFlagsKeysEnum } from '@novu/shared';
 
 import { GetMessagesCommand } from './get-messages.command';
 import { GetSubscriber, GetSubscriberCommand } from '../../../subscribers/usecases/get-subscriber';
+import { GetFeatureFlag, GetFeatureFlagCommand } from '@novu/application-generic';
 
 @Injectable()
 export class GetMessages {
-  constructor(private messageRepository: MessageRepository, private getSubscriberUseCase: GetSubscriber) {}
+  constructor(
+    private messageRepository: MessageRepository,
+    private getSubscriberUseCase: GetSubscriber,
+    private getFeatureFlag: GetFeatureFlag
+  ) {}
 
   async execute(command: GetMessagesCommand) {
     const LIMIT = command.limit;
@@ -53,6 +58,24 @@ export class GetMessages {
       }
     }
 
+    const isEnabled = await this.getFeatureFlag.execute(
+      GetFeatureFlagCommand.create({
+        key: FeatureFlagsKeysEnum.IS_NEW_MESSAGES_API_RESPONSE_ENABLED,
+        organizationId: command.organizationId,
+        userId: 'api',
+        environmentId: command.environmentId,
+      })
+    );
+
+    if (isEnabled) {
+      return {
+        hasMore: data?.length === command.limit,
+        page: command.page,
+        pageSize: LIMIT,
+        data,
+      };
+    }
+
     const totalCount = await this.messageRepository.count(query);
 
     const hasMore = this.getHasMore(command.page, LIMIT, data.length, totalCount);

apps/api/src/app/widgets/dtos/message-response.dto.ts

@@ -201,8 +201,8 @@ export class MessageResponseDto {
 }
 
 export class MessagesResponseDto {
-  @ApiProperty()
-  totalCount: number;
+  @ApiPropertyOptional()
+  totalCount?: number;
 
   @ApiProperty()
   hasMore: boolean;

libs/shared/src/types/feature-flags/feature-flags.ts

@@ -10,4 +10,5 @@ export enum FeatureFlagsKeysEnum {
   IS_BILLING_ENABLED = 'IS_BILLING_ENABLED',
   IS_ECHO_ENABLED = 'IS_ECHO_ENABLED',
   IS_IMPROVED_ONBOARDING_ENABLED = 'IS_IMPROVED_ONBOARDING_ENABLED',
+  IS_NEW_MESSAGES_API_RESPONSE_ENABLED = 'IS_NEW_MESSAGES_API_RESPONSE_ENABLED',
 }