hunk.code_window: export interface IMessageTemplate {
     _id?: string;
     subject?: string;
     name?: string;
     type: StepTypeEnum;
     contentType?: MessageTemplateContentType;
     content: string | IEmailBlock[];
  
hunk.labels: keep keep keep add keep keep keep
hunk.after_edit:   title?: string;
  
hunk.file_path: libs/shared/src/entities/message-template/message-template.interface.ts
hunk.type: add
file: import { IsDefined, IsString } from 'class-validator';
  
  import { EnvironmentCommand } from '../../../shared/commands/project.command';
  import { TopicKey } from '@novu/shared';
  
  export class GetTopicSubscribersCommand extends EnvironmentCommand {
    @IsString()
    @IsDefined()
    topicKey: TopicKey;
  }
  