text: 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;