me sale este error Property ‘user’ does not exist on type 'Request<ParamsDictionary, any, any, ParsedQs, Reco exist on type ‘Request&l...

mira usa este codigo en el controlador, en ves de utilizar express, utiliza Request en el common.

import { Controller, Post, Request, UseGuards } from '@nestjs/common';
import { AuthGuard } from '@nestjs/passport';

@Controller('auth')
export class AuthController {
  @UseGuards(AuthGuard('local'))
  @Post('login')
  login(@Request() req) {
    return req.user;
  }
}