问 类型'ErrorRequestHandler<ParamsDictionary，any，any，ParsedQs，Record<string，any>‘.ts(2339)上不存在属性'message’？

EN

看起来您有一个正确声明的错误处理程序，但是 err 参数的类型是错误的，相反， const errorHandler 本身应该使用 ErrorRequestHandler 类型，以便推断参数。

类型 ErrorRequestHandler 为 defined as follows in DefinitelyTyped

export type ErrorRequestHandler<
  P = ParamsDictionary,
  ResBody = any,
  ReqBody = any,
  ReqQuery = ParsedQs,
  Locals extends Record<string, any> = Record<string, any>
  err: any,
  req: Request<P, ResBody, ReqBody, ReqQuery, Locals>,
  res: Response<ResBody, Locals>,
  next: NextFunction,
) => void;

建议您的代码应如下所示：

const errorHandler: ErrorRequestHandler = (
  _req, 
  _next
) => {
  const statusCode = res.statusCode === 200 ? 500 : res.statusCode;
  res.status(statusCode);
  res.json({
    message: err.message,
    stack: err.stack