当文件被拒绝时，使用multer投掷错误上传多个文件上传

Question

我正在使用.fields上传两个图像（[{name：'centerripimage'，maxcount：1}，{name：'reskaldProofImage'，maxcount：1}]）;，但是当FileFilter拒绝文件

错误

  if (this.req.files[placeholder.fieldname].length === 1) {
                                                ^

TypeError: Cannot read properties of undefined (reading 'length')

multer投掷错误时，在文件appender.js中的第49行时，它会丢弃错误。 req.files [占位符。fieldname]显示未定义。

case 'OBJECT':
      if (this.req.files[placeholder.fieldname].length === 1) {
        delete this.req.files[placeholder.fieldname]
      } else {
        arrayRemove(this.req.files[placeholder.fieldname], placeholder)
      }
      break

我的代码

const multer  = require('multer');
const path = require('path');

var storage = multer.diskStorage({
    destination: function (req, file, cb) {
      console.log('type',req.body.type);
      cb(null, "uploads/images/");
    },
    filename: function (req, file, cb) {
      cb(
        null,
        file.fieldname + "-" + Date.now() + path.extname(file.originalname)
      );
    },
  });


const maxSize = 1 * 1024 * 1024; // for 1MB

var upload = multer({
    storage: storage,
    fileFilter: async (req, file, cb) => {

      var ext = path.extname(file.originalname);
      console.log("ext", ext);

      let validImageExtensions = ['png', 'jpg', 'jpeg'];

      if (validImageExtensions.indexOf(ext.substring(1)) === -1) {
        cb(null, false);
        console.log("invalid extension");
        return cb(new Error("Only " + validImageExtensions + " are allowed with maxsize 1MB"));
      }else{
        console.log("valid extension");
        cb(null, true);
      }
    },
    limits: { fileSize: maxSize },
  });

module.exports = upload;

如果文件扩展名匹配和图像存储在上传文件夹中，则一切正常，但是当扩展不匹配时，会丢弃相同的错误。

我为您创建了GitHub存储库，以更好地测试错误。 https://github.com/alexadvent/multer-multer-multer-multer-multiple-multiple-sissue

并发送put put put put put在URL Localhost请求：运行服务后8000/上传图像。