`retryWhen`过期后如何返回值？(对于`canActivate`防护)

import { Injectable } from '@angular/core';
import { CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot, UrlTree } from '@angular/router';
import { Observable, of } from 'rxjs';
import { catchError, retryWhen, delay, take } from 'rxjs/operators';

@Injectable({
  providedIn: 'root'
})
export class AuthGuard implements CanActivate {
  canActivate(
    route: ActivatedRouteSnapshot,
    state: RouterStateSnapshot
  ): Observable<boolean | UrlTree> {
    return this.checkAuth().pipe(
      retryWhen(errors => errors.pipe(
        delay(1000), // 延迟1秒后重试
        take(3) // 最多重试3次
      )),
      catchError(() => of(false)) // 如果重试次数用完，返回false
    );
  }

  private checkAuth(): Observable<boolean> {
    // 这里模拟一个可能会失败的认证检查
    return new Observable(observer => {
      const isAuthenticated = false; // 假设认证失败
      if (isAuthenticated) {
        observer.next(true);
        observer.complete();
      } else {
        observer.error('Not authenticated');
      }
    });
  }
}