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为什么 jwtService 未定义？

JwtAuthGuard 我在其中验证标头中的令牌：

import { JwtService } from '@nestjs/jwt';
import {
  CanActivate,
  ExecutionContext,
  UnauthorizedException
} from '@nestjs/common';
import { Observable } from 'rxjs';

export class JwtAuthGuard implements CanActivate {
  constructor(private jwtService: JwtService) {}

  canActivate(
    context: ExecutionContext
  ): boolean | Promise<boolean> | Observable<boolean> {
    const req = context.switchToHttp().getRequest();

    try {
      const authHeader = req.headers.authorization;
      const token = authHeader.split(' ')[1];

      const user = this.jwtService.verify(token);

      req.user = user;
      return true;
    } catch (error) {
      console.log(error);
      throw new UnauthorizedException();
    }
  }
}

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