TypeError: String(file) on version 2.x

[nagayev]

Support plan

• Which support plan is this issue covered by? Community
• Currently blocking your project/work? (yes/no): no
• Affecting a production system? (yes/no): yes

Context

• Node.js version: 16.15.1
• Release Line of Formidable (Legacy, Current, Next): Current
• Formidable exact version: 2.0.1
• Environment (node, browser, native, OS): nodejs on linux
• Used with (popular names of modules): nextjs

What are you trying to achieve or the steps to reproduce?

You can use this code.

import formidable from "formidable";
import fs from "fs";

export const config = {
  api: {
    bodyParser: false
  }
};

const post = async (req, res) => {
  console.log('handling file...');
  const form = new formidable.IncomingForm();
  form.parse(req, async function (err, fields, files) {
    if (err) console.error(err);
    console.log(files.file.newFilename);
    try{
      await saveFile1(files.file);
    }
    catch(e){
      console.log('Error was catched: ',e);
    }
    return res.status(201).send("Nothing");
  });
};

const saveFile1 = async (file) => {
  console.log(file); //**TypeError**
  const data = fs.readFileSync(file.filepath);
  fs.writeFileSync(`./public/${file.originalFilename}`, data);
  //await fs.unlinkSync(file.path);
  return;
};

export default (req, res) => {
  req.method === "POST"
    ? post(req, res)
    : req.method === "PUT"
    ? console.log("PUT")
    : req.method === "DELETE"
    ? console.log("DELETE")
    : req.method === "GET"
    ? console.log("GET")
    : res.status(404).send("");
};

What was the result you got?

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

What result did you expect?

Working app.

[nagayev]

Workaround: Apply patch from my PR #890