从功能角度配置变量？

Question

我正在使用angular，需要将以下内容放入一个配置变量中，放入我的一个配置文件中，但是我对它们的工作方式不太熟悉。任何建议都会有所帮助！

export interface ComponentCanDeactivate {
  canDeactivate: () => boolean | Observable<boolean>;
}

@Injectable()
export class PreNavigationGuard implements CanDeactivate<ComponentCanDeactivate> {
  canDeactivate(component: ComponentCanDeactivate): boolean | Observable<boolean> {
    // if there are no pending changes, just allow deactivation; else confirm first
    return component.canDeactivate() ?
      true :
      // NOTE: this warning message will only be shown when navigating elsewhere within app;
      // when navigating away from angular app, the browser will show a generic warning message
      confirm('WARNING: You have unsaved changes. Press Cancel to go back and save these changes, or OK to lose these changes.');
  }
}