试试看：

const { expressjwt } = require("express-jwt");

Official docs

//protection API and Authentication JWT middleware

const expressJwt = require('express-jwt')

function authJwt() {
    const secret = process.env.secret;

    function expressJwt(param) {
        return undefined;
    }
have the same problem

    return expressJwt({
      secret,
       algorithms: ['HS256']
  })
 }

 module.exports = authJwt;