Angular拦截器-类型“Observable<unknown>”不能赋值给类型“Observable<HttpEvent<any>>”

import { Injectable } from '@angular/core';
import { HttpInterceptor, HttpRequest, HttpHandler, HttpEvent } from '@angular/common/http';
import { Observable } from 'rxjs';
import { map } from 'rxjs/operators';

@Injectable()
export class MyInterceptor implements HttpInterceptor {
  intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    // 在这里进行拦截和处理
    // ...

    // 返回转换后的Observable类型
    return next.handle(request).pipe(
      map(event => {
        // 对响应进行处理
        // ...

        // 返回处理后的响应
        return event;
      })
    );
  }
}