Promises (await/async) support in Multer 2.0 (MulterError) instead of callback

To control a size of an uploading files in Multer 2.0.0-rc.2 we can use:

const upload = multer({
	limits: {
		fileSize: CONFIG_STORAGE.uploader.maxFileSizeInBytes
	}
}).single("file");

app.post('/upload', (req, res) => {

	upload(req, res, (err) => {

		if (err) {
			console.error("An error occurred when uploading");
			return;
		}

		console.log("Everything went fine");

	});

})

It does work but it uses a callback and it’s ugly, especially in 2020+. Isn’t better to provide a native promises (aka await/async) support instead? Without applying a workaround such as util/promisify.

[pubmikeb]

Well, then it’s a great opportunity to upgrade the entire Express.js codebase to make it ES2021 friendly.

[seahindeniz]

Similar to #265?