NewChatService can be used as a constructor to create a ChatService "object".

NewCommentService can be used as a constructor to create a CommentService "object".

NewFeedService can be used as a constructor to create a FeedService "object".

NewImageService can be used as a constructor to create a ImageService "object".

NewLikeService can be used as a constructor to create a LikeService "object".

NewMailService can be used as a constructor to generate a new MailService "object".

NewMessageService can be used as a constructor to create a MessageService "object".

NewNotificationService can be used as a constructor to create a NotificationService "object".

NewPasswordResetService can be used as a constructor to generate a new PasswordResetService "object".

NewPostService can be used as a constructor to create a PostService "object".

NewPushSubscriptionService can be used as a constructor to create a PushSubscriptionService "object".

NewUserService can be used as a constructor to generate a new UserService "object".

MockMailService is a mock implementation of the MailServiceInterface.