Method constructor

src/pkg/config/config.ts:95–102

(private mq: IMessageQueue)

  private EE: EventEmitter<string> = new EventEmitter<string>();

  constructor(private mq: IMessageQueue) {
    this.mq.subscribe<TKeyValue<SystemConfigKey>>(SystemConfigChange, ({ key, value, prev }) => {
      // 更新缓存
      this.cache.set(key, value);
      // 触发事件
      this.EE.emit(key, value, prev);
    });
  }

  // 添加配置变更监听
  addListener<T extends SystemConfigKey>(