如何设置 error.name in extended class Error in Node.js?

Question

err.name 在 centralErrorHandler console logs 显示 undefined.

该怎么设置才能在 centralErrorHandler 获得 error name err.name = 'ExpressValidatorError';

如果把 return next(err); in auth.controller.js 改成 throw err;, err.name 就能成功获得 'ExpressValidatorError' 但不确定 throw err; 这样做对不对。

centralErrorHandler.js

module.exports = (err, req, res, next) => {           
        console.log(err.name);
        if(err.name === 'ExpressValidatorError') err = handleExpressValidatorError(err);            
}

auth.controller.js

const {validationResult} = require('express-validator');

exports.signup = (req, res) => {     
    const errors = validationResult(req); 
   
      if (!errors.isEmpty()) {
        let err = new AppError(`Invalid login credentials.`, 422);
        err.name = 'ExpressValidatorError';            
             
        return next(err);
      }

    res.status(200).send(req.user);          
}

appError.js

class AppError extends Error {
    constructor(message, statusCode){
        super(message);

        this.statusCode = statusCode;
        this.status = `${statusCode}`.startsWith('4') ? 'fail' : 'error';        
        this.isOperational = true;        

        Error.captureStackTrace(this, this.constructor);
    }
}

module.exports = AppError;

Answer 1

在exports.signup = (req, res) 里加 next 解决了 undefined的问题。

exports.signup = (req, res, next) => {